diff --git a/src/Components/Blazor/Blazor/ref/Microsoft.AspNetCore.Blazor.netstandard2.0.cs b/src/Components/Blazor/Blazor/ref/Microsoft.AspNetCore.Blazor.netstandard2.0.cs index ab316c370145..e7b60daa246c 100644 --- a/src/Components/Blazor/Blazor/ref/Microsoft.AspNetCore.Blazor.netstandard2.0.cs +++ b/src/Components/Blazor/Blazor/ref/Microsoft.AspNetCore.Blazor.netstandard2.0.cs @@ -61,7 +61,7 @@ public partial class WebAssemblyRenderer : Microsoft.AspNetCore.Components.Rende public WebAssemblyRenderer(System.IServiceProvider serviceProvider) : base (default(System.IServiceProvider)) { } public System.Threading.Tasks.Task AddComponentAsync(System.Type componentType, string domElementSelector) { throw null; } public System.Threading.Tasks.Task AddComponentAsync(string domElementSelector) where TComponent : Microsoft.AspNetCore.Components.IComponent { throw null; } - public override System.Threading.Tasks.Task DispatchEventAsync(int eventHandlerId, Microsoft.AspNetCore.Components.UIEventArgs eventArgs) { throw null; } + public override System.Threading.Tasks.Task DispatchEventAsync(int eventHandlerId, Microsoft.AspNetCore.Components.Rendering.EventFieldInfo eventFieldInfo, Microsoft.AspNetCore.Components.UIEventArgs eventArgs) { throw null; } protected override void Dispose(bool disposing) { } protected override void HandleException(System.Exception exception) { } protected override System.Threading.Tasks.Task UpdateDisplayAsync(in Microsoft.AspNetCore.Components.Rendering.RenderBatch batch) { throw null; } diff --git a/src/Components/Blazor/Blazor/src/Rendering/WebAssemblyRenderer.cs b/src/Components/Blazor/Blazor/src/Rendering/WebAssemblyRenderer.cs index 0e1e237b6bd2..4098bb5e411c 100644 --- a/src/Components/Blazor/Blazor/src/Rendering/WebAssemblyRenderer.cs +++ b/src/Components/Blazor/Blazor/src/Rendering/WebAssemblyRenderer.cs @@ -116,7 +116,7 @@ protected override void HandleException(Exception exception) } /// - public override Task DispatchEventAsync(int eventHandlerId, UIEventArgs eventArgs) + public override Task DispatchEventAsync(int eventHandlerId, EventFieldInfo eventFieldInfo, UIEventArgs eventArgs) { // Be sure we only run one event handler at once. Although they couldn't run // simultaneously anyway (there's only one thread), they could run nested on @@ -135,7 +135,7 @@ public override Task DispatchEventAsync(int eventHandlerId, UIEventArgs eventArg if (isDispatchingEvent) { - var info = new IncomingEventInfo(eventHandlerId, eventArgs); + var info = new IncomingEventInfo(eventHandlerId, eventFieldInfo, eventArgs); deferredIncomingEvents.Enqueue(info); return info.TaskCompletionSource.Task; } @@ -144,7 +144,7 @@ public override Task DispatchEventAsync(int eventHandlerId, UIEventArgs eventArg try { isDispatchingEvent = true; - return base.DispatchEventAsync(eventHandlerId, eventArgs); + return base.DispatchEventAsync(eventHandlerId, eventFieldInfo, eventArgs); } finally { @@ -168,7 +168,7 @@ private async Task ProcessNextDeferredEventAsync() try { - await DispatchEventAsync(info.EventHandlerId, info.EventArgs); + await DispatchEventAsync(info.EventHandlerId, info.EventFieldInfo, info.EventArgs); taskCompletionSource.SetResult(null); } catch (Exception ex) @@ -180,12 +180,14 @@ private async Task ProcessNextDeferredEventAsync() readonly struct IncomingEventInfo { public readonly int EventHandlerId; + public readonly EventFieldInfo EventFieldInfo; public readonly UIEventArgs EventArgs; public readonly TaskCompletionSource TaskCompletionSource; - public IncomingEventInfo(int eventHandlerId, UIEventArgs eventArgs) + public IncomingEventInfo(int eventHandlerId, EventFieldInfo eventFieldInfo, UIEventArgs eventArgs) { EventHandlerId = eventHandlerId; + EventFieldInfo = eventFieldInfo; EventArgs = eventArgs; TaskCompletionSource = new TaskCompletionSource(); } diff --git a/src/Components/Browser.JS/dist/Release/blazor.server.js b/src/Components/Browser.JS/dist/Release/blazor.server.js index 35b5c7400ca2..21e0c21f884b 100644 --- a/src/Components/Browser.JS/dist/Release/blazor.server.js +++ b/src/Components/Browser.JS/dist/Release/blazor.server.js @@ -1,15 +1,15 @@ -!function(e){var 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You tried to pass "+r.length+".");var o=Module.stackSave();try{for(var a=Module.stackAlloc(r.length),u=Module.stackAlloc(4),l=0;l { - raiseEvent(event, this.browserRendererId, eventHandlerId, eventArgs); + this.eventDelegator = new EventDelegator((event, eventHandlerId, eventArgs, eventFieldInfo) => { + raiseEvent(event, this.browserRendererId, eventHandlerId, eventArgs, eventFieldInfo); }); } @@ -50,7 +51,7 @@ export class BrowserRenderer { const ownerDocument = getClosestDomElement(element).ownerDocument; const activeElementBefore = ownerDocument && ownerDocument.activeElement; - this.applyEdits(batch, element, 0, edits, referenceFrames); + this.applyEdits(batch, componentId, element, 0, edits, referenceFrames); // Try to restore focus in case it was lost due to an element move if ((activeElementBefore instanceof HTMLElement) && ownerDocument && ownerDocument.activeElement !== activeElementBefore) { @@ -70,7 +71,7 @@ export class BrowserRenderer { this.childComponentLocations[componentId] = element; } - private applyEdits(batch: RenderBatch, parent: LogicalElement, childIndex: number, edits: ArraySegment, referenceFrames: ArrayValues) { + private applyEdits(batch: RenderBatch, componentId: number, parent: LogicalElement, childIndex: number, edits: ArraySegment, referenceFrames: ArrayValues) { let currentDepth = 0; let childIndexAtCurrentDepth = childIndex; let permutationList: PermutationListEntry[] | undefined; @@ -91,7 +92,7 @@ export class BrowserRenderer { const frameIndex = editReader.newTreeIndex(edit); const frame = batch.referenceFramesEntry(referenceFrames, frameIndex); const siblingIndex = editReader.siblingIndex(edit); - this.insertFrame(batch, parent, childIndexAtCurrentDepth + siblingIndex, referenceFrames, frame, frameIndex); + this.insertFrame(batch, componentId, parent, childIndexAtCurrentDepth + siblingIndex, referenceFrames, frame, frameIndex); break; } case EditType.removeFrame: { @@ -105,7 +106,7 @@ export class BrowserRenderer { const siblingIndex = editReader.siblingIndex(edit); const element = getLogicalChild(parent, childIndexAtCurrentDepth + siblingIndex); if (element instanceof Element) { - this.applyAttribute(batch, element, frame); + this.applyAttribute(batch, componentId, element, frame); } else { throw new Error('Cannot set attribute on non-element child'); } @@ -182,12 +183,12 @@ export class BrowserRenderer { } } - private insertFrame(batch: RenderBatch, parent: LogicalElement, childIndex: number, frames: ArrayValues, frame: RenderTreeFrame, frameIndex: number): number { + private insertFrame(batch: RenderBatch, componentId: number, parent: LogicalElement, childIndex: number, frames: ArrayValues, frame: RenderTreeFrame, frameIndex: number): number { const frameReader = batch.frameReader; const frameType = frameReader.frameType(frame); switch (frameType) { case FrameType.element: - this.insertElement(batch, parent, childIndex, frames, frame, frameIndex); + this.insertElement(batch, componentId, parent, childIndex, frames, frame, frameIndex); return 1; case FrameType.text: this.insertText(batch, parent, childIndex, frame); @@ -198,7 +199,7 @@ export class BrowserRenderer { this.insertComponent(batch, parent, childIndex, frame); return 1; case FrameType.region: - return this.insertFrameRange(batch, parent, childIndex, frames, frameIndex + 1, frameIndex + frameReader.subtreeLength(frame)); + return this.insertFrameRange(batch, componentId, parent, childIndex, frames, frameIndex + 1, frameIndex + frameReader.subtreeLength(frame)); case FrameType.elementReferenceCapture: if (parent instanceof Element) { applyCaptureIdToElement(parent, frameReader.elementReferenceCaptureId(frame)!); @@ -215,7 +216,7 @@ export class BrowserRenderer { } } - private insertElement(batch: RenderBatch, parent: LogicalElement, childIndex: number, frames: ArrayValues, frame: RenderTreeFrame, frameIndex: number) { + private insertElement(batch: RenderBatch, componentId: number, parent: LogicalElement, childIndex: number, frames: ArrayValues, frame: RenderTreeFrame, frameIndex: number) { const frameReader = batch.frameReader; const tagName = frameReader.elementName(frame)!; const newDomElementRaw = tagName === 'svg' || isSvgElement(parent) ? @@ -229,11 +230,11 @@ export class BrowserRenderer { for (let descendantIndex = frameIndex + 1; descendantIndex < descendantsEndIndexExcl; descendantIndex++) { const descendantFrame = batch.referenceFramesEntry(frames, descendantIndex); if (frameReader.frameType(descendantFrame) === FrameType.attribute) { - this.applyAttribute(batch, newDomElementRaw, descendantFrame); + this.applyAttribute(batch, componentId, newDomElementRaw, descendantFrame); } else { // As soon as we see a non-attribute child, all the subsequent child frames are // not attributes, so bail out and insert the remnants recursively - this.insertFrameRange(batch, newElement, 0, frames, descendantIndex, descendantsEndIndexExcl); + this.insertFrameRange(batch, componentId, newElement, 0, frames, descendantIndex, descendantsEndIndexExcl); break; } } @@ -265,7 +266,7 @@ export class BrowserRenderer { } } - private applyAttribute(batch: RenderBatch, toDomElement: Element, attributeFrame: RenderTreeFrame) { + private applyAttribute(batch: RenderBatch, componentId: number, toDomElement: Element, attributeFrame: RenderTreeFrame) { const frameReader = batch.frameReader; const attributeName = frameReader.attributeName(attributeFrame)!; const browserRendererId = this.browserRendererId; @@ -277,7 +278,7 @@ export class BrowserRenderer { if (firstTwoChars !== 'on' || !eventName) { throw new Error(`Attribute has nonzero event handler ID, but attribute name '${attributeName}' does not start with 'on'.`); } - this.eventDelegator.setListener(toDomElement, eventName, eventHandlerId); + this.eventDelegator.setListener(toDomElement, eventName, eventHandlerId, componentId); return; } @@ -352,11 +353,11 @@ export class BrowserRenderer { } } - private insertFrameRange(batch: RenderBatch, parent: LogicalElement, childIndex: number, frames: ArrayValues, startIndex: number, endIndexExcl: number): number { + private insertFrameRange(batch: RenderBatch, componentId: number, parent: LogicalElement, childIndex: number, frames: ArrayValues, startIndex: number, endIndexExcl: number): number { const origChildIndex = childIndex; for (let index = startIndex; index < endIndexExcl; index++) { const frame = batch.referenceFramesEntry(frames, index); - const numChildrenInserted = this.insertFrame(batch, parent, childIndex, frames, frame, index); + const numChildrenInserted = this.insertFrame(batch, componentId, parent, childIndex, frames, frame, index); childIndex += numChildrenInserted; // Skip over any descendants, since they are already dealt with recursively @@ -397,7 +398,7 @@ function countDescendantFrames(batch: RenderBatch, frame: RenderTreeFrame): numb } } -function raiseEvent(event: Event, browserRendererId: number, eventHandlerId: number, eventArgs: EventForDotNet) { +function raiseEvent(event: Event, browserRendererId: number, eventHandlerId: number, eventArgs: EventForDotNet, eventFieldInfo: EventFieldInfo | null) { if (preventDefaultEvents[event.type]) { event.preventDefault(); } @@ -406,6 +407,7 @@ function raiseEvent(event: Event, browserRendererId: number, eventHandlerId: num browserRendererId, eventHandlerId, eventArgsType: eventArgs.type, + eventFieldInfo: eventFieldInfo, }; return DotNet.invokeMethodAsync( diff --git a/src/Components/Browser.JS/src/Rendering/EventDelegator.ts b/src/Components/Browser.JS/src/Rendering/EventDelegator.ts index 6b95994076ef..332d3cb6cf8b 100644 --- a/src/Components/Browser.JS/src/Rendering/EventDelegator.ts +++ b/src/Components/Browser.JS/src/Rendering/EventDelegator.ts @@ -1,4 +1,5 @@ import { EventForDotNet, UIEventArgs } from './EventForDotNet'; +import { EventFieldInfo } from './EventFieldInfo'; const nonBubblingEvents = toLookup([ 'abort', @@ -21,7 +22,7 @@ const nonBubblingEvents = toLookup([ ]); export interface OnEventCallback { - (event: Event, eventHandlerId: number, eventArgs: EventForDotNet): void; + (event: Event, eventHandlerId: number, eventArgs: EventForDotNet, eventFieldInfo: EventFieldInfo | null): void; } // Responsible for adding/removing the eventInfo on an expando property on DOM elements, and @@ -40,7 +41,7 @@ export class EventDelegator { this.eventInfoStore = new EventInfoStore(this.onGlobalEvent.bind(this)); } - public setListener(element: Element, eventName: string, eventHandlerId: number) { + public setListener(element: Element, eventName: string, eventHandlerId: number, renderingComponentId: number) { // Ensure we have a place to store event info for this element let infoForElement: EventHandlerInfosForElement = element[this.eventsCollectionKey]; if (!infoForElement) { @@ -53,7 +54,7 @@ export class EventDelegator { this.eventInfoStore.update(oldInfo.eventHandlerId, eventHandlerId); } else { // Go through the whole flow which might involve registering a new global handler - const newInfo = { element, eventName, eventHandlerId }; + const newInfo = { element, eventName, eventHandlerId, renderingComponentId }; this.eventInfoStore.add(newInfo); infoForElement[eventName] = newInfo; } @@ -89,7 +90,7 @@ export class EventDelegator { const eventIsNonBubbling = nonBubblingEvents.hasOwnProperty(evt.type); while (candidateElement) { if (candidateElement.hasOwnProperty(this.eventsCollectionKey)) { - const handlerInfos = candidateElement[this.eventsCollectionKey]; + const handlerInfos: EventHandlerInfosForElement = candidateElement[this.eventsCollectionKey]; if (handlerInfos.hasOwnProperty(evt.type)) { // We are going to raise an event for this element, so prepare info needed by the .NET code if (!eventArgs) { @@ -97,7 +98,8 @@ export class EventDelegator { } const handlerInfo = handlerInfos[evt.type]; - this.onEvent(evt, handlerInfo.eventHandlerId, eventArgs); + const eventFieldInfo = EventFieldInfo.fromEvent(handlerInfo.renderingComponentId, evt); + this.onEvent(evt, handlerInfo.eventHandlerId, eventArgs, eventFieldInfo); } } @@ -180,6 +182,11 @@ interface EventHandlerInfo { element: Element; eventName: string; eventHandlerId: number; + + // The component whose tree includes the event handler attribute frame, *not* necessarily the + // same component that will be re-rendered after the event is handled (since we re-render the + // component that supplied the delegate, not the one that rendered the event handler frame) + renderingComponentId: number; } function toLookup(items: string[]): { [key: string]: boolean } { diff --git a/src/Components/Browser.JS/src/Rendering/EventFieldInfo.ts b/src/Components/Browser.JS/src/Rendering/EventFieldInfo.ts new file mode 100644 index 000000000000..205f5d0cf276 --- /dev/null +++ b/src/Components/Browser.JS/src/Rendering/EventFieldInfo.ts @@ -0,0 +1,34 @@ +export class EventFieldInfo { + constructor(public componentId: number, public fieldValue: string | boolean) { + } + + public static fromEvent(componentId: number, event: Event): EventFieldInfo | null { + const elem = event.target; + if (elem instanceof Element) { + const fieldData = getFormFieldData(elem); + if (fieldData) { + return new EventFieldInfo(componentId, fieldData.value); + } + } + + // This event isn't happening on a form field that we can reverse-map back to some incoming attribute + return null; + } +} + +function getFormFieldData(elem: Element) { + // The logic in here should be the inverse of the logic in BrowserRenderer's tryApplySpecialProperty. + // That is, we're doing the reverse mapping, starting from an HTML property and reconstructing which + // "special" attribute would have been mapped to that property. + if (elem instanceof HTMLInputElement) { + return (elem.type && elem.type.toLowerCase() === 'checkbox') + ? { value: elem.checked } + : { value: elem.value }; + } + + if (elem instanceof HTMLSelectElement || elem instanceof HTMLTextAreaElement) { + return { value: elem.value }; + } + + return null; +} diff --git a/src/Components/Browser/ref/Microsoft.AspNetCore.Components.Browser.netstandard2.0.cs b/src/Components/Browser/ref/Microsoft.AspNetCore.Components.Browser.netstandard2.0.cs index 1d85e121578e..2a4866299fcf 100644 --- a/src/Components/Browser/ref/Microsoft.AspNetCore.Components.Browser.netstandard2.0.cs +++ b/src/Components/Browser/ref/Microsoft.AspNetCore.Components.Browser.netstandard2.0.cs @@ -12,6 +12,7 @@ public partial class BrowserEventDescriptor public BrowserEventDescriptor() { } public int BrowserRendererId { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } } public string EventArgsType { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } } + public Microsoft.AspNetCore.Components.Rendering.EventFieldInfo EventFieldInfo { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } } public int EventHandlerId { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } } } } diff --git a/src/Components/Browser/src/RendererRegistryEventDispatcher.cs b/src/Components/Browser/src/RendererRegistryEventDispatcher.cs index f00fe33aa6ef..894b2172e6d8 100644 --- a/src/Components/Browser/src/RendererRegistryEventDispatcher.cs +++ b/src/Components/Browser/src/RendererRegistryEventDispatcher.cs @@ -21,9 +21,38 @@ public static class RendererRegistryEventDispatcher public static Task DispatchEvent( BrowserEventDescriptor eventDescriptor, string eventArgsJson) { + InterpretEventDescriptor(eventDescriptor); var eventArgs = ParseEventArgsJson(eventDescriptor.EventArgsType, eventArgsJson); var renderer = RendererRegistry.Current.Find(eventDescriptor.BrowserRendererId); - return renderer.DispatchEventAsync(eventDescriptor.EventHandlerId, eventArgs); + return renderer.DispatchEventAsync(eventDescriptor.EventHandlerId, eventDescriptor.EventFieldInfo, eventArgs); + } + + private static void InterpretEventDescriptor(BrowserEventDescriptor eventDescriptor) + { + // The incoming field value can be either a bool or a string, but since the .NET property + // type is 'object', it will deserialize initially as a JsonElement + var fieldInfo = eventDescriptor.EventFieldInfo; + if (fieldInfo != null) + { + if (fieldInfo.FieldValue is JsonElement attributeValueJsonElement) + { + switch (attributeValueJsonElement.Type) + { + case JsonValueType.True: + case JsonValueType.False: + fieldInfo.FieldValue = attributeValueJsonElement.GetBoolean(); + break; + default: + fieldInfo.FieldValue = attributeValueJsonElement.GetString(); + break; + } + } + else + { + // Unanticipated value type. Ensure we don't do anything with it. + eventDescriptor.EventFieldInfo = null; + } + } } private static UIEventArgs ParseEventArgsJson(string eventArgsType, string eventArgsJson) @@ -105,6 +134,11 @@ public class BrowserEventDescriptor /// For framework use only. /// public string EventArgsType { get; set; } + + /// + /// For framework use only. + /// + public EventFieldInfo EventFieldInfo { get; set; } } } } diff --git a/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs b/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs index ff2219e59ed4..be05804ba786 100644 --- a/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs +++ b/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs @@ -688,6 +688,12 @@ namespace Microsoft.AspNetCore.Components.Rendering public int ComponentId { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } } public System.Collections.Generic.IEnumerable Tokens { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } } } + public partial class EventFieldInfo + { + public EventFieldInfo() { } + public int ComponentId { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } } + public object FieldValue { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } } + } public partial class HtmlRenderer : Microsoft.AspNetCore.Components.Rendering.Renderer { public HtmlRenderer(System.IServiceProvider serviceProvider, System.Func htmlEncoder, Microsoft.AspNetCore.Components.Rendering.IDispatcher dispatcher) : base (default(System.IServiceProvider)) { } @@ -721,7 +727,7 @@ public abstract partial class Renderer : System.IDisposable protected internal virtual void AddToRenderQueue(int componentId, Microsoft.AspNetCore.Components.RenderFragment renderFragment) { } protected internal int AssignRootComponentId(Microsoft.AspNetCore.Components.IComponent component) { throw null; } public static Microsoft.AspNetCore.Components.Rendering.IDispatcher CreateDefaultDispatcher() { throw null; } - public virtual System.Threading.Tasks.Task DispatchEventAsync(int eventHandlerId, Microsoft.AspNetCore.Components.UIEventArgs eventArgs) { throw null; } + public virtual System.Threading.Tasks.Task DispatchEventAsync(int eventHandlerId, Microsoft.AspNetCore.Components.Rendering.EventFieldInfo fieldInfo, Microsoft.AspNetCore.Components.UIEventArgs eventArgs) { throw null; } public void Dispose() { } protected virtual void Dispose(bool disposing) { } protected abstract void HandleException(System.Exception exception); diff --git a/src/Components/Components/src/EventCallbackFactoryBinderExtensions.cs b/src/Components/Components/src/EventCallbackFactoryBinderExtensions.cs index 16fe53ad2614..9e5458780f25 100644 --- a/src/Components/Components/src/EventCallbackFactoryBinderExtensions.cs +++ b/src/Components/Components/src/EventCallbackFactoryBinderExtensions.cs @@ -687,13 +687,26 @@ static DateTime ConvertDateTime(object obj, string format) { } - // We only invoke the setter if the conversion didn't throw. This is valuable because it allows us to attempt - // to process invalid input but avoid dirtying the state of the component if can't be converted. Imagine if - // we assigned default(T) on failure - this would result in trouncing the user's typed in value. + // We only invoke the setter if the conversion didn't throw, or if the newly-entered value is empty. + // If the user entered some non-empty value we couldn't parse, we leave the state of the .NET field + // unchanged, which for a two-way binding results in the UI reverting to its previous valid state + // because the diff will see the current .NET output no longer matches the render tree since we + // patched it to reflect the state of the UI. + // + // This reversion behavior is valuable because alternatives are problematic: + // - If we assigned default(T) on failure, the user would lose whatever data they were editing, + // for example if they accidentally pressed an alphabetical key while editing a number with + // @bind:event="oninput" + // - If the diff mechanism didn't revert to the previous good value, the user wouldn't necessarily + // know that the data they are submitting is different from what they think they've typed if (converted) { setter(value); } + else if (string.Empty.Equals(e.Value)) + { + setter(default); + } }; return factory.Create(receiver, callback); } diff --git a/src/Components/Components/src/RenderTree/ArrayBuilder.cs b/src/Components/Components/src/RenderTree/ArrayBuilder.cs index 6d38c95b32ee..25dbe2054848 100644 --- a/src/Components/Components/src/RenderTree/ArrayBuilder.cs +++ b/src/Components/Components/src/RenderTree/ArrayBuilder.cs @@ -106,6 +106,25 @@ public void RemoveLast() _items[_itemsInUse] = default(T); // Release to GC } + /// + /// Inserts the item at the specified index, moving the contents of the subsequent entries along by one. + /// + /// The index at which the value is to be inserted. + /// The value to insert. + public void InsertExpensive(int insertAtIndex, T value) + { + // Same expansion logic as elsewhere + if (_itemsInUse == _items.Length) + { + SetCapacity(_items.Length * 2, preserveContents: true); + } + + Array.Copy(_items, insertAtIndex, _items, insertAtIndex + 1, _itemsInUse - insertAtIndex); + _itemsInUse++; + + _items[insertAtIndex] = value; + } + /// /// Marks the array as empty, also shrinking the underlying storage if it was /// not being used to near its full capacity. diff --git a/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs b/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs index 46d2295e3d77..e5773a41b2cb 100644 --- a/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs +++ b/src/Components/Components/src/RenderTree/RenderTreeBuilder.cs @@ -521,8 +521,18 @@ public void AddMultipleAttributes(int sequence, IEnumerableThe name of another attribute whose value can be updated when the event handler is executed. public void SetUpdatesAttributeName(string updatesAttributeName) { - // TODO: This will be implemented in a later PR, once aspnetcore-tooling - // is updated to call this method. + if (_entries.Count == 0) + { + throw new InvalidOperationException("No preceding attribute frame exists."); + } + + ref var prevFrame = ref _entries.Buffer[_entries.Count - 1]; + if (prevFrame.FrameType != RenderTreeFrameType.Attribute) + { + throw new InvalidOperationException($"Incorrect frame type: '{prevFrame.FrameType}'"); + } + + prevFrame = prevFrame.WithAttributeEventUpdatesAttributeName(updatesAttributeName); } /// @@ -699,6 +709,19 @@ public void Clear() _seenAttributeNames?.Clear(); } + // internal because this should only be used during the post-event tree patching logic + // It's expensive because it involves copying all the subsequent memory in the array + internal void InsertAttributeExpensive(int insertAtIndex, int sequence, string attributeName, object attributeValue) + { + // Replicate the same attribute omission logic as used elsewhere + if ((attributeValue == null) || (attributeValue is bool boolValue && !boolValue)) + { + return; + } + + _entries.InsertExpensive(insertAtIndex, RenderTreeFrame.Attribute(sequence, attributeName, attributeValue)); + } + /// /// Returns the values that have been appended. /// diff --git a/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs b/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs index baaf6097de20..e11b12bb24d1 100644 --- a/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs +++ b/src/Components/Components/src/RenderTree/RenderTreeDiffBuilder.cs @@ -11,6 +11,11 @@ internal static class RenderTreeDiffBuilder { enum DiffAction { Match, Insert, Delete } + // We use int.MinValue to signal this special case because (1) it would never be used by + // the Razor compiler or by accident in developer code, and (2) we know it will always + // hit the "old < new" code path during diffing so we only have to check for it in one place. + public const int SystemAddedAttributeSequenceNumber = int.MinValue; + public static RenderTreeDiff ComputeDiff( Renderer renderer, RenderBatchBuilder batchBuilder, @@ -382,6 +387,21 @@ private static object KeyValue(ref RenderTreeFrame frame) } else if (oldSeq < newSeq) { + if (oldSeq == SystemAddedAttributeSequenceNumber) + { + // This special sequence number means that we can't rely on the sequence numbers + // for matching and are forced to fall back on the dictionary-based join in order + // to produce an optimal diff. If we didn't we'd likely produce a diff that removes + // and then re-adds the same attribute. + // We use the special sequence number to signal it because it adds almost no cost + // to check for it only in this one case. + AppendAttributeDiffEntriesForRangeSlow( + ref diffContext, + oldStartIndex, oldEndIndexExcl, + newStartIndex, newEndIndexExcl); + return; + } + // An attribute was removed compared to the old sequence. RemoveOldFrame(ref diffContext, oldStartIndex); @@ -661,13 +681,17 @@ private static int NextSiblingIndex(in RenderTreeFrame frame, int frameIndex) var valueChanged = !Equals(oldFrame.AttributeValue, newFrame.AttributeValue); if (valueChanged) { + InitializeNewAttributeFrame(ref diffContext, ref newFrame); + var referenceFrameIndex = diffContext.ReferenceFrames.Append(newFrame); + diffContext.Edits.Append(RenderTreeEdit.SetAttribute(diffContext.SiblingIndex, referenceFrameIndex)); + + // If we're replacing an old event handler ID with a new one, register the old one for disposal, + // plus keep track of the old->new chain until the old one is fully disposed if (oldFrame.AttributeEventHandlerId > 0) { + diffContext.Renderer.TrackReplacedEventHandlerId(oldFrame.AttributeEventHandlerId, newFrame.AttributeEventHandlerId); diffContext.BatchBuilder.DisposedEventHandlerIds.Append(oldFrame.AttributeEventHandlerId); } - InitializeNewAttributeFrame(ref diffContext, ref newFrame); - var referenceFrameIndex = diffContext.ReferenceFrames.Append(newFrame); - diffContext.Edits.Append(RenderTreeEdit.SetAttribute(diffContext.SiblingIndex, referenceFrameIndex)); } else if (oldFrame.AttributeEventHandlerId > 0) { diff --git a/src/Components/Components/src/RenderTree/RenderTreeFrame.cs b/src/Components/Components/src/RenderTree/RenderTreeFrame.cs index 7bf18c150dea..0226cfd9d7c4 100644 --- a/src/Components/Components/src/RenderTree/RenderTreeFrame.cs +++ b/src/Components/Components/src/RenderTree/RenderTreeFrame.cs @@ -104,6 +104,14 @@ namespace Microsoft.AspNetCore.Components.RenderTree /// [FieldOffset(24)] public readonly object AttributeValue; + /// + /// If the property equals , + /// and the attribute represents an event handler, gets the name of another attribute whose value + /// can be updated to represent the UI state prior to executing the event handler. This is + /// primarily used in two-way bindings. + /// + [FieldOffset(32)] public readonly string AttributeEventUpdatesAttributeName; + // -------------------------------------------------------------------------------- // RenderTreeFrameType.Component // -------------------------------------------------------------------------------- @@ -259,7 +267,7 @@ private RenderTreeFrame(int sequence, bool isMarkup, string textOrMarkup) } // Attribute constructor - private RenderTreeFrame(int sequence, string attributeName, object attributeValue, int attributeEventHandlerId) + private RenderTreeFrame(int sequence, string attributeName, object attributeValue, int attributeEventHandlerId, string attributeEventUpdatesAttributeName) : this() { FrameType = RenderTreeFrameType.Attribute; @@ -267,6 +275,7 @@ private RenderTreeFrame(int sequence, string attributeName, object attributeValu AttributeName = attributeName; AttributeValue = attributeValue; AttributeEventHandlerId = attributeEventHandlerId; + AttributeEventUpdatesAttributeName = attributeEventUpdatesAttributeName; } // Element reference capture constructor @@ -299,7 +308,7 @@ internal static RenderTreeFrame Markup(int sequence, string markupContent) => new RenderTreeFrame(sequence, isMarkup: true, textOrMarkup: markupContent); internal static RenderTreeFrame Attribute(int sequence, string name, object value) - => new RenderTreeFrame(sequence, attributeName: name, attributeValue: value, attributeEventHandlerId: 0); + => new RenderTreeFrame(sequence, attributeName: name, attributeValue: value, attributeEventHandlerId: 0, attributeEventUpdatesAttributeName: null); internal static RenderTreeFrame ChildComponent(int sequence, Type componentType) => new RenderTreeFrame(sequence, componentSubtreeLength: 0, componentType, null, null); @@ -323,13 +332,19 @@ internal RenderTreeFrame WithComponentSubtreeLength(int componentSubtreeLength) => new RenderTreeFrame(Sequence, componentSubtreeLength: componentSubtreeLength, ComponentType, ComponentState, ComponentKey); internal RenderTreeFrame WithAttributeSequence(int sequence) - => new RenderTreeFrame(sequence, attributeName: AttributeName, AttributeValue, AttributeEventHandlerId); + => new RenderTreeFrame(sequence, attributeName: AttributeName, AttributeValue, AttributeEventHandlerId, AttributeEventUpdatesAttributeName); internal RenderTreeFrame WithComponent(ComponentState componentState) => new RenderTreeFrame(Sequence, componentSubtreeLength: ComponentSubtreeLength, ComponentType, componentState, ComponentKey); internal RenderTreeFrame WithAttributeEventHandlerId(int eventHandlerId) - => new RenderTreeFrame(Sequence, attributeName: AttributeName, AttributeValue, eventHandlerId); + => new RenderTreeFrame(Sequence, attributeName: AttributeName, AttributeValue, eventHandlerId, AttributeEventUpdatesAttributeName); + + internal RenderTreeFrame WithAttributeValue(object attributeValue) + => new RenderTreeFrame(Sequence, attributeName: AttributeName, attributeValue, AttributeEventHandlerId, AttributeEventUpdatesAttributeName); + + internal RenderTreeFrame WithAttributeEventUpdatesAttributeName(string attributeUpdatesAttributeName) + => new RenderTreeFrame(Sequence, attributeName: AttributeName, AttributeValue, AttributeEventHandlerId, attributeUpdatesAttributeName); internal RenderTreeFrame WithRegionSubtreeLength(int regionSubtreeLength) => new RenderTreeFrame(Sequence, regionSubtreeLength: regionSubtreeLength); diff --git a/src/Components/Components/src/Rendering/EventFieldInfo.cs b/src/Components/Components/src/Rendering/EventFieldInfo.cs new file mode 100644 index 000000000000..391844405f4f --- /dev/null +++ b/src/Components/Components/src/Rendering/EventFieldInfo.cs @@ -0,0 +1,23 @@ +// Copyright (c) .NET Foundation. All rights reserved. +// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. + +namespace Microsoft.AspNetCore.Components.Rendering +{ + /// + /// Information supplied with an event notification that can be used to update an existing + /// render tree to match the latest UI state when a form field has mutated. To determine + /// which field has been mutated, the renderer matches it based on the event handler ID. + /// + public class EventFieldInfo + { + /// + /// Identifies the component whose render tree contains the affected form field. + /// + public int ComponentId { get; set; } + + /// + /// Specifies the form field's new value. + /// + public object FieldValue { get; set; } + } +} diff --git a/src/Components/Components/src/Rendering/RenderTreeUpdater.cs b/src/Components/Components/src/Rendering/RenderTreeUpdater.cs new file mode 100644 index 000000000000..5168ba393606 --- /dev/null +++ b/src/Components/Components/src/Rendering/RenderTreeUpdater.cs @@ -0,0 +1,113 @@ +// Copyright (c) .NET Foundation. All rights reserved. +// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. + +using Microsoft.AspNetCore.Components.RenderTree; + +namespace Microsoft.AspNetCore.Components.Rendering +{ + internal class RenderTreeUpdater + { + public static void UpdateToMatchClientState(RenderTreeBuilder renderTreeBuilder, int eventHandlerId, object newFieldValue) + { + // We only allow the client to supply string or bool currently, since those are the only kinds of + // values we output on attributes that go to the client + if (!(newFieldValue is string || newFieldValue is bool)) + { + return; + } + + // Find the element that contains the event handler + var frames = renderTreeBuilder.GetFrames(); + var framesArray = frames.Array; + var framesLength = frames.Count; + var closestElementFrameIndex = -1; + for (var frameIndex = 0; frameIndex < framesLength; frameIndex++) + { + ref var frame = ref framesArray[frameIndex]; + switch (frame.FrameType) + { + case RenderTreeFrameType.Element: + closestElementFrameIndex = frameIndex; + break; + case RenderTreeFrameType.Attribute: + if (frame.AttributeEventHandlerId == eventHandlerId) + { + if (!string.IsNullOrEmpty(frame.AttributeEventUpdatesAttributeName)) + { + UpdateFrameToMatchClientState( + renderTreeBuilder, + framesArray, + closestElementFrameIndex, + frame.AttributeEventUpdatesAttributeName, + newFieldValue); + } + + // Whether or not we did update the frame, that was the one that matches + // the event handler ID, so no need to look any further + return; + } + break; + } + } + } + + private static void UpdateFrameToMatchClientState(RenderTreeBuilder renderTreeBuilder, RenderTreeFrame[] framesArray, int elementFrameIndex, string attributeName, object attributeValue) + { + // Find the attribute frame + ref var elementFrame = ref framesArray[elementFrameIndex]; + var elementSubtreeEndIndexExcl = elementFrameIndex + elementFrame.ElementSubtreeLength; + for (var attributeFrameIndex = elementFrameIndex + 1; attributeFrameIndex < elementSubtreeEndIndexExcl; attributeFrameIndex++) + { + ref var attributeFrame = ref framesArray[attributeFrameIndex]; + if (attributeFrame.FrameType != RenderTreeFrameType.Attribute) + { + // We're now looking at the descendants not attributes, so the search is over + break; + } + + if (attributeFrame.AttributeName == attributeName) + { + // Found an existing attribute we can update + attributeFrame = attributeFrame.WithAttributeValue(attributeValue); + return; + } + } + + // If we get here, we didn't find the desired attribute, so we have to insert a new frame for it + var insertAtIndex = elementFrameIndex + 1; + renderTreeBuilder.InsertAttributeExpensive(insertAtIndex, RenderTreeDiffBuilder.SystemAddedAttributeSequenceNumber, attributeName, attributeValue); + framesArray = renderTreeBuilder.GetFrames().Array; // Refresh in case it mutated due to the expansion + + // Update subtree length for this and all ancestor containers + // Ancestors can only be regions or other elements, since components can't "contain" elements inline + // We only have to walk backwards, since later entries in the frames array can't contain an earlier one + for (var otherFrameIndex = elementFrameIndex; otherFrameIndex >= 0; otherFrameIndex--) + { + ref var otherFrame = ref framesArray[otherFrameIndex]; + switch (otherFrame.FrameType) + { + case RenderTreeFrameType.Element: + { + var otherFrameSubtreeLength = otherFrame.ElementSubtreeLength; + var otherFrameEndIndexExcl = otherFrameIndex + otherFrameSubtreeLength; + if (otherFrameEndIndexExcl > elementFrameIndex) // i.e., contains the element we're inserting into + { + otherFrame = otherFrame.WithElementSubtreeLength(otherFrameSubtreeLength + 1); + } + break; + } + case RenderTreeFrameType.Region: + { + var otherFrameSubtreeLength = otherFrame.RegionSubtreeLength; + var otherFrameEndIndexExcl = otherFrameIndex + otherFrameSubtreeLength; + if (otherFrameEndIndexExcl > elementFrameIndex) // i.e., contains the element we're inserting into + { + otherFrame = otherFrame.WithRegionSubtreeLength(otherFrameSubtreeLength + 1); + } + break; + } + } + } + } + } +} diff --git a/src/Components/Components/src/Rendering/Renderer.cs b/src/Components/Components/src/Rendering/Renderer.cs index 88b9f71e09d1..8d7753d0ff85 100644 --- a/src/Components/Components/src/Rendering/Renderer.cs +++ b/src/Components/Components/src/Rendering/Renderer.cs @@ -20,6 +20,7 @@ public abstract class Renderer : IDisposable private readonly Dictionary _componentStateById = new Dictionary(); private readonly RenderBatchBuilder _batchBuilder = new RenderBatchBuilder(); private readonly Dictionary _eventBindings = new Dictionary(); + private readonly Dictionary _eventHandlerIdReplacements = new Dictionary(); private readonly IDispatcher _dispatcher; private int _nextComponentId = 0; // TODO: change to 'long' when Mono .NET->JS interop supports it @@ -205,11 +206,12 @@ private ComponentState AttachAndInitComponent(IComponent component, int parentCo /// /// The value from the original event attribute. /// Arguments to be passed to the event handler. + /// Information that the renderer can use to update the state of the existing render tree to match the UI. /// /// A which will complete once all asynchronous processing related to the event /// has completed. /// - public virtual Task DispatchEventAsync(int eventHandlerId, UIEventArgs eventArgs) + public virtual Task DispatchEventAsync(int eventHandlerId, EventFieldInfo fieldInfo, UIEventArgs eventArgs) { EnsureSynchronizationContext(); @@ -218,6 +220,12 @@ public virtual Task DispatchEventAsync(int eventHandlerId, UIEventArgs eventArgs throw new ArgumentException($"There is no event handler with ID {eventHandlerId}"); } + if (fieldInfo != null) + { + var latestEquivalentEventHandlerId = FindLatestEventHandlerIdInChain(eventHandlerId); + UpdateRenderTreeToMatchClientState(latestEquivalentEventHandlerId, fieldInfo); + } + Task task = null; try { @@ -401,6 +409,24 @@ protected internal virtual void AddToRenderQueue(int componentId, RenderFragment } } + internal void TrackReplacedEventHandlerId(int oldEventHandlerId, int newEventHandlerId) + { + // Tracking the chain of old->new replacements allows us to interpret incoming EventFieldInfo + // values even if they refer to an event handler ID that's since been superseded. This is essential + // for tree patching to work in an async environment. + _eventHandlerIdReplacements.Add(oldEventHandlerId, newEventHandlerId); + } + + private int FindLatestEventHandlerIdInChain(int eventHandlerId) + { + while (_eventHandlerIdReplacements.TryGetValue(eventHandlerId, out var replacementEventHandlerId)) + { + eventHandlerId = replacementEventHandlerId; + } + + return eventHandlerId; + } + private void EnsureSynchronizationContext() { // When the IDispatcher is a synchronization context @@ -613,7 +639,9 @@ private void RemoveEventHandlerIds(ArrayRange eventHandlerIds, Task afterTa var count = eventHandlerIds.Count; for (var i = 0; i < count; i++) { - _eventBindings.Remove(array[i]); + var eventHandlerIdToRemove = array[i]; + _eventBindings.Remove(eventHandlerIdToRemove); + _eventHandlerIdReplacements.Remove(eventHandlerIdToRemove); } } else @@ -662,6 +690,18 @@ private async Task GetErrorHandledTask(Task taskToHandle) } } + private void UpdateRenderTreeToMatchClientState(int eventHandlerId, EventFieldInfo fieldInfo) + { + var componentState = GetOptionalComponentState(fieldInfo.ComponentId); + if (componentState != null) + { + RenderTreeUpdater.UpdateToMatchClientState( + componentState.CurrrentRenderTree, + eventHandlerId, + fieldInfo.FieldValue); + } + } + /// /// Releases all resources currently used by this instance. /// diff --git a/src/Components/Components/test/EventCallbackFactoryBinderExtensionsTest.cs b/src/Components/Components/test/EventCallbackFactoryBinderExtensionsTest.cs index 84bfc725074e..831734f46073 100644 --- a/src/Components/Components/test/EventCallbackFactoryBinderExtensionsTest.cs +++ b/src/Components/Components/test/EventCallbackFactoryBinderExtensionsTest.cs @@ -28,6 +28,23 @@ public async Task CreateBinder_SwallowsConversionException() Assert.Equal(1, component.Count); } + [Fact] + public async Task CreateBinder_IfConverterThrows_ConvertsEmptyStringToDefault() + { + // Arrange + var value = 17; + var component = new EventCountingComponent(); + Action setter = (_) => value = _; + + var binder = EventCallback.Factory.CreateBinder(component, setter, value); + + // Act + await binder.InvokeAsync(new UIChangeEventArgs() { Value = string.Empty, }); + + Assert.Equal(0, value); // Calls setter to apply default value for this type + Assert.Equal(1, component.Count); + } + [Fact] public async Task CreateBinder_ThrowsSetterException() { diff --git a/src/Components/Components/test/RenderTreeUpdaterTest.cs b/src/Components/Components/test/RenderTreeUpdaterTest.cs new file mode 100644 index 000000000000..27d269986713 --- /dev/null +++ b/src/Components/Components/test/RenderTreeUpdaterTest.cs @@ -0,0 +1,167 @@ +// Copyright (c) .NET Foundation. All rights reserved. +// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. + +using System; +using Microsoft.AspNetCore.Components.Rendering; +using Microsoft.AspNetCore.Components.RenderTree; +using Microsoft.AspNetCore.Components.Test.Helpers; +using Xunit; + +namespace Microsoft.AspNetCore.Components.Test +{ + public class RenderTreeUpdaterTest + { + [Fact] + public void IgnoresUnknownEventHandlerId() + { + // Arrange + var valuePropName = "testprop"; + var renderer = new TestRenderer(); + var builder = new RenderTreeBuilder(renderer); + builder.OpenElement(0, "elem"); + builder.AddAttribute(1, "eventname", () => { }); + builder.SetUpdatesAttributeName(valuePropName); + builder.AddAttribute(2, valuePropName, "initial value"); + builder.CloseElement(); + var frames = builder.GetFrames(); + frames.Array[1] = frames.Array[1].WithAttributeEventHandlerId(123); // An unrelated event + + // Act + RenderTreeUpdater.UpdateToMatchClientState(builder, 456, "new value"); + + // Assert + Assert.Collection(frames.AsEnumerable(), + frame => AssertFrame.Element(frame, "elem", 3, 0), + frame => AssertFrame.Attribute(frame, "eventname", v => Assert.IsType(v), 1), + frame => AssertFrame.Attribute(frame, valuePropName, "initial value", 2)); + } + + [Fact] + public void IgnoresUpdatesToAttributesIfUnexpectedValueTypeSupplied() + { + // Currently we only allow the client to supply a string or a bool, since those are the + // only types of values we render onto attributes + + // Arrange + var valuePropName = "testprop"; + var renderer = new TestRenderer(); + var builder = new RenderTreeBuilder(renderer); + builder.OpenElement(0, "elem"); + builder.AddAttribute(1, "eventname", () => { }); + builder.SetUpdatesAttributeName(valuePropName); + builder.AddAttribute(2, valuePropName, "initial value"); + builder.CloseElement(); + var frames = builder.GetFrames(); + frames.Array[1] = frames.Array[1].WithAttributeEventHandlerId(123); // An unrelated event + + // Act + RenderTreeUpdater.UpdateToMatchClientState(builder, 123, new object()); + + // Assert + Assert.Collection(frames.AsEnumerable(), + frame => AssertFrame.Element(frame, "elem", 3, 0), + frame => AssertFrame.Attribute(frame, "eventname", v => Assert.IsType(v), 1), + frame => AssertFrame.Attribute(frame, valuePropName, "initial value", 2)); + } + + [Fact] + public void UpdatesOnlyMatchingAttributeValue() + { + // Arrange + var valuePropName = "testprop"; + var renderer = new TestRenderer(); + var builder = new RenderTreeBuilder(renderer); + builder.OpenElement(0, "elem"); + builder.AddAttribute(1, "eventname", () => { }); + builder.SetUpdatesAttributeName(valuePropName); + builder.AddAttribute(2, valuePropName, "unchanged 1"); + builder.CloseElement(); + builder.OpenElement(3, "elem"); + builder.AddAttribute(4, "eventname", () => { }); + builder.SetUpdatesAttributeName(valuePropName); + builder.AddAttribute(5, "unrelated prop before", "unchanged 2"); + builder.AddAttribute(6, valuePropName, "initial value"); + builder.AddAttribute(7, "unrelated prop after", "unchanged 3"); + builder.CloseElement(); + var frames = builder.GetFrames(); + frames.Array[1] = frames.Array[1].WithAttributeEventHandlerId(123); // An unrelated event + frames.Array[4] = frames.Array[4].WithAttributeEventHandlerId(456); + + // Act + RenderTreeUpdater.UpdateToMatchClientState(builder, 456, "new value"); + + // Assert + Assert.Collection(frames.AsEnumerable(), + frame => AssertFrame.Element(frame, "elem", 3, 0), + frame => AssertFrame.Attribute(frame, "eventname", v => Assert.IsType(v), 1), + frame => AssertFrame.Attribute(frame, valuePropName, "unchanged 1", 2), + frame => AssertFrame.Element(frame, "elem", 5, 3), + frame => AssertFrame.Attribute(frame, "eventname", v => Assert.IsType(v), 4), + frame => AssertFrame.Attribute(frame, "unrelated prop before", "unchanged 2", 5), + frame => AssertFrame.Attribute(frame, valuePropName, "new value", 6), + frame => AssertFrame.Attribute(frame, "unrelated prop after", "unchanged 3", 7)); + } + + [Fact] + public void AddsAttributeIfNotFound() + { + // Arrange + var valuePropName = "testprop"; + var renderer = new TestRenderer(); + var builder = new RenderTreeBuilder(renderer); + builder.OpenElement(0, "elem"); + builder.AddAttribute(1, "eventname", () => { }); + builder.SetUpdatesAttributeName(valuePropName); + builder.CloseElement(); + var frames = builder.GetFrames(); + frames.Array[1] = frames.Array[1].WithAttributeEventHandlerId(123); + + // Act + RenderTreeUpdater.UpdateToMatchClientState(builder, 123, "new value"); + frames = builder.GetFrames(); + + // Assert + Assert.Collection(frames.AsEnumerable(), + frame => AssertFrame.Element(frame, "elem", 3, 0), + frame => AssertFrame.Attribute(frame, valuePropName, "new value", RenderTreeDiffBuilder.SystemAddedAttributeSequenceNumber), + frame => AssertFrame.Attribute(frame, "eventname", v => Assert.IsType(v), 1)); + } + + [Fact] + public void ExpandsAllAncestorsWhenAddingAttribute() + { + // Arrange + var valuePropName = "testprop"; + var renderer = new TestRenderer(); + var builder = new RenderTreeBuilder(renderer); + builder.OpenElement(0, "grandparent"); + builder.OpenRegion(1); + builder.OpenElement(2, "sibling before"); // To show that non-ancestors aren't expanded + builder.CloseElement(); + builder.OpenElement(3, "elem with handler"); + builder.AddAttribute(4, "eventname", () => { }); + builder.SetUpdatesAttributeName(valuePropName); + builder.CloseElement(); // elem with handler + builder.CloseRegion(); + builder.CloseElement(); // grandparent + var frames = builder.GetFrames(); + frames.Array[4] = frames.Array[4].WithAttributeEventHandlerId(123); + + // Act + RenderTreeUpdater.UpdateToMatchClientState(builder, 123, "new value"); + frames = builder.GetFrames(); + + // Assert + Assert.Collection(frames.AsEnumerable(), + frame => AssertFrame.Element(frame, "grandparent", 6, 0), + frame => AssertFrame.Region(frame, 5, 1), + frame => AssertFrame.Element(frame, "sibling before", 1, 2), + frame => AssertFrame.Element(frame, "elem with handler", 3, 3), + frame => AssertFrame.Attribute(frame, valuePropName, "new value", RenderTreeDiffBuilder.SystemAddedAttributeSequenceNumber), + frame => AssertFrame.Attribute(frame, "eventname", v => Assert.IsType(v), 4)); + } + + private static ArrayRange BuildFrames(params RenderTreeFrame[] frames) + => new ArrayRange(frames, frames.Length); + } +} diff --git a/src/Components/Components/test/RendererTest.cs b/src/Components/Components/test/RendererTest.cs index 2c3e110e412f..bfa9c49b22af 100644 --- a/src/Components/Components/test/RendererTest.cs +++ b/src/Components/Components/test/RendererTest.cs @@ -3271,6 +3271,105 @@ public void DisposingRenderer_CapturesExceptionsFromAllRegisteredComponents() Assert.Contains(exception2, renderer.HandledExceptions); } + [Theory] + [InlineData(null)] // No existing attribute to update + [InlineData("old property value")] // Has existing attribute to update + public void EventFieldInfoCanPatchTreeSoDiffDoesNotUpdateAttribute(string oldValue) + { + // Arrange: Render a component with an event handler + var renderer = new TestRenderer(); + var component = new BoundPropertyComponent { BoundString = oldValue }; + var componentId = renderer.AssignRootComponentId(component); + component.TriggerRender(); + + var eventHandlerId = renderer.Batches.Single() + .ReferenceFrames + .First(frame => frame.FrameType == RenderTreeFrameType.Attribute && frame.AttributeEventHandlerId > 0) + .AttributeEventHandlerId; + + // Act: Fire event and re-render + var eventFieldInfo = new EventFieldInfo + { + FieldValue = "new property value", + ComponentId = componentId + }; + var dispatchEventTask = renderer.DispatchEventAsync(eventHandlerId, eventFieldInfo, new UIChangeEventArgs + { + Value = "new property value" + }); + Assert.True(dispatchEventTask.IsCompletedSuccessfully); + + // Assert: Property was updated, but the diff doesn't include changing the + // element attribute, since we told it the element attribute was already updated + Assert.Equal("new property value", component.BoundString); + Assert.Equal(2, renderer.Batches.Count); + var batch2 = renderer.Batches[1]; + Assert.Collection(batch2.DiffsInOrder.Single().Edits.ToArray(), edit => + { + // The only edit is updating the event handler ID, since the test component + // deliberately uses a capturing lambda. The whole point of this test is to + // show that the diff does *not* update the BoundString value attribute. + Assert.Equal(RenderTreeEditType.SetAttribute, edit.Type); + var attributeFrame = batch2.ReferenceFrames[edit.ReferenceFrameIndex]; + AssertFrame.Attribute(attributeFrame, "ontestevent", typeof(Action)); + Assert.NotEqual(0, attributeFrame.AttributeEventHandlerId); + Assert.NotEqual(eventHandlerId, attributeFrame.AttributeEventHandlerId); + }); + } + + [Fact] + public void EventFieldInfoWorksWhenEventHandlerIdWasSuperseded() + { + // Arrange: Render a component with an event handler + // We want the renderer to think none of the "UpdateDisplay" calls ever complete, because we + // want to keep reusing the same eventHandlerId and not let it get disposed + var renderCompletedTcs = new TaskCompletionSource(); + var renderer = new TestRenderer { NextRenderResultTask = renderCompletedTcs.Task }; + var component = new BoundPropertyComponent { BoundString = "old property value" }; + var componentId = renderer.AssignRootComponentId(component); + + component.TriggerRender(); + + var eventHandlerId = renderer.Batches.Single() + .ReferenceFrames + .First(frame => frame.FrameType == RenderTreeFrameType.Attribute && frame.AttributeEventHandlerId > 0) + .AttributeEventHandlerId; + + // Act: Fire event and re-render *repeatedly*, without changing to use a newer event handler ID, + // even though we know the event handler ID is getting updated in successive diffs + for (var i = 0; i < 10; i++) + { + var newPropertyValue = $"new property value {i}"; + var fieldInfo = new EventFieldInfo + { + ComponentId = componentId, + FieldValue = newPropertyValue, + }; + var dispatchEventTask = renderer.DispatchEventAsync(eventHandlerId, fieldInfo, new UIChangeEventArgs + { + Value = newPropertyValue + }); + Assert.True(dispatchEventTask.IsCompletedSuccessfully); + + // Assert: Property was updated, but the diff doesn't include changing the + // element attribute, since we told it the element attribute was already updated + Assert.Equal(newPropertyValue, component.BoundString); + Assert.Equal(i + 2, renderer.Batches.Count); + var latestBatch = renderer.Batches.Last(); + Assert.Collection(latestBatch.DiffsInOrder.Single().Edits.ToArray(), edit => + { + // The only edit is updating the event handler ID, since the test component + // deliberately uses a capturing lambda. The whole point of this test is to + // show that the diff does *not* update the BoundString value attribute. + Assert.Equal(RenderTreeEditType.SetAttribute, edit.Type); + var attributeFrame = latestBatch.ReferenceFrames[edit.ReferenceFrameIndex]; + AssertFrame.Attribute(attributeFrame, "ontestevent", typeof(Action)); + Assert.NotEqual(0, attributeFrame.AttributeEventHandlerId); + Assert.NotEqual(eventHandlerId, attributeFrame.AttributeEventHandlerId); + }); + } + } + private class NoOpRenderer : Renderer { public NoOpRenderer() : base(new TestServiceProvider(), new RendererSynchronizationContext()) @@ -3959,5 +4058,26 @@ protected override void BuildRenderTree(RenderTreeBuilder builder) builder.CloseElement(); } } + + class BoundPropertyComponent : AutoRenderComponent + { + public string BoundString { get; set; } + + protected override void BuildRenderTree(RenderTreeBuilder builder) + { + var unrelatedThingToMakeTheLambdaCapture = new object(); + + builder.OpenElement(0, "element with event"); + builder.AddAttribute(1, nameof(BoundString), BoundString); + builder.AddAttribute(2, "ontestevent", (UIChangeEventArgs eventArgs) => + { + BoundString = (string)eventArgs.Value; + TriggerRender(); + GC.KeepAlive(unrelatedThingToMakeTheLambdaCapture); + }); + builder.SetUpdatesAttributeName(nameof(BoundString)); + builder.CloseElement(); + } + } } } diff --git a/src/Components/Shared/test/TestRenderer.cs b/src/Components/Shared/test/TestRenderer.cs index d838ea007b7c..0e08894749f8 100644 --- a/src/Components/Shared/test/TestRenderer.cs +++ b/src/Components/Shared/test/TestRenderer.cs @@ -38,6 +38,8 @@ public TestRenderer(IServiceProvider serviceProvider) : base(serviceProvider, ne public bool ShouldHandleExceptions { get; set; } + public Task NextRenderResultTask { get; set; } = Task.CompletedTask; + public new int AssignRootComponentId(IComponent component) => base.AssignRootComponentId(component); @@ -53,8 +55,11 @@ public new Task RenderRootComponentAsync(int componentId) public new Task RenderRootComponentAsync(int componentId, ParameterCollection parameters) => InvokeAsync(() => base.RenderRootComponentAsync(componentId, parameters)); - public new Task DispatchEventAsync(int eventHandlerId, UIEventArgs args) - => InvokeAsync(() => base.DispatchEventAsync(eventHandlerId, args)); + public Task DispatchEventAsync(int eventHandlerId, UIEventArgs args) + => InvokeAsync(() => base.DispatchEventAsync(eventHandlerId, null, args)); + + public new Task DispatchEventAsync(int eventHandlerId, EventFieldInfo eventFieldInfo, UIEventArgs args) + => InvokeAsync(() => base.DispatchEventAsync(eventHandlerId, eventFieldInfo, args)); private static Task UnwrapTask(Task task) { @@ -109,7 +114,7 @@ protected override Task UpdateDisplayAsync(in RenderBatch renderBatch) // To test async UI updates, subclass TestRenderer and override UpdateDisplayAsync. OnUpdateDisplayComplete?.Invoke(); - return Task.CompletedTask; + return NextRenderResultTask; } } } diff --git a/src/Components/test/E2ETest/Tests/BindTest.cs b/src/Components/test/E2ETest/Tests/BindTest.cs index 04aae5d5c228..2cc55deee1a7 100644 --- a/src/Components/test/E2ETest/Tests/BindTest.cs +++ b/src/Components/test/E2ETest/Tests/BindTest.cs @@ -224,14 +224,19 @@ public void CanBindTextboxInt() Assert.Equal("-42", boundValue.Text); Assert.Equal("-42", mirrorValue.GetAttribute("value")); - // Modify target; value is not updated because it's not convertable. + // Clear target; value resets to zero target.Clear(); - Browser.Equal("-42", () => boundValue.Text); - Assert.Equal("-42", mirrorValue.GetAttribute("value")); + Browser.Equal("0", () => target.GetAttribute("value")); + Assert.Equal("0", boundValue.Text); + Assert.Equal("0", mirrorValue.GetAttribute("value")); // Modify target; verify value is updated and that textboxes linked to the same data are updated - target.SendKeys("42\t"); - Browser.Equal("42", () => boundValue.Text); + // Leading zeros are not preserved + target.SendKeys("42"); + Browser.Equal("042", () => target.GetAttribute("value")); + target.SendKeys("\t"); + Browser.Equal("42", () => target.GetAttribute("value")); + Assert.Equal("42", boundValue.Text); Assert.Equal("42", mirrorValue.GetAttribute("value")); } @@ -278,14 +283,17 @@ public void CanBindTextboxLong() Assert.Equal("3000000000", boundValue.Text); Assert.Equal("3000000000", mirrorValue.GetAttribute("value")); - // Modify target; value is not updated because it's not convertable. + // Clear target; value resets to zero target.Clear(); - Browser.Equal("3000000000", () => boundValue.Text); - Assert.Equal("3000000000", mirrorValue.GetAttribute("value")); + Browser.Equal("0", () => target.GetAttribute("value")); + Assert.Equal("0", boundValue.Text); + Assert.Equal("0", mirrorValue.GetAttribute("value")); // Modify target; verify value is updated and that textboxes linked to the same data are updated + target.SendKeys(Keys.Backspace); target.SendKeys("-3000000000\t"); - Browser.Equal("-3000000000", () => boundValue.Text); + Browser.Equal("-3000000000", () => target.GetAttribute("value")); + Assert.Equal("-3000000000", boundValue.Text); Assert.Equal("-3000000000", mirrorValue.GetAttribute("value")); } @@ -332,14 +340,17 @@ public void CanBindTextboxFloat() Assert.Equal("3.141", boundValue.Text); Assert.Equal("3.141", mirrorValue.GetAttribute("value")); - // Modify target; value is not updated because it's not convertable. + // Clear target; value resets to zero target.Clear(); - Browser.Equal("3.141", () => boundValue.Text); - Assert.Equal("3.141", mirrorValue.GetAttribute("value")); + Browser.Equal("0", () => target.GetAttribute("value")); + Assert.Equal("0", boundValue.Text); + Assert.Equal("0", mirrorValue.GetAttribute("value")); // Modify target; verify value is updated and that textboxes linked to the same data are updated + target.SendKeys(Keys.Backspace); target.SendKeys("-3.141\t"); - Browser.Equal("-3.141", () => boundValue.Text); + Browser.Equal("-3.141", () => target.GetAttribute("value")); + Assert.Equal("-3.141", boundValue.Text); Assert.Equal("-3.141", mirrorValue.GetAttribute("value")); } @@ -386,12 +397,14 @@ public void CanBindTextboxDouble() Assert.Equal("3.14159265359", boundValue.Text); Assert.Equal("3.14159265359", mirrorValue.GetAttribute("value")); - // Modify target; value is not updated because it's not convertable. + // Clear target; value resets to default target.Clear(); - Browser.Equal("3.14159265359", () => boundValue.Text); - Assert.Equal("3.14159265359", mirrorValue.GetAttribute("value")); + Browser.Equal("0", () => target.GetAttribute("value")); + Assert.Equal("0", boundValue.Text); + Assert.Equal("0", mirrorValue.GetAttribute("value")); // Modify target; verify value is updated and that textboxes linked to the same data are updated + target.SendKeys(Keys.Backspace); target.SendKeys("-3.14159265359\t"); Browser.Equal("-3.14159265359", () => boundValue.Text); Assert.Equal("-3.14159265359", mirrorValue.GetAttribute("value")); @@ -399,8 +412,10 @@ public void CanBindTextboxDouble() // Modify target; verify value is updated and that textboxes linked to the same data are updated // Double shouldn't preserve trailing zeros target.Clear(); + target.SendKeys(Keys.Backspace); target.SendKeys("0.010\t"); - Browser.Equal("0.01", () => boundValue.Text); + Browser.Equal("0.01", () => target.GetAttribute("value")); + Assert.Equal("0.01", boundValue.Text); Assert.Equal("0.01", mirrorValue.GetAttribute("value")); } @@ -454,10 +469,11 @@ public void CanBindTextboxDecimal() Assert.Equal("0.0000000000000000000000000001", boundValue.Text); Assert.Equal("0.0000000000000000000000000001", mirrorValue.GetAttribute("value")); - // Modify target; value is not updated because it's not convertable. + // Clear textbox; value updates to zero because that's the default target.Clear(); - Browser.Equal("0.0000000000000000000000000001", () => boundValue.Text); - Assert.Equal("0.0000000000000000000000000001", mirrorValue.GetAttribute("value")); + Browser.Equal("0", () => target.GetAttribute("value")); + Assert.Equal("0", boundValue.Text); + Assert.Equal("0", mirrorValue.GetAttribute("value")); // Modify target; verify value is updated and that textboxes linked to the same data are updated // Decimal should preserve trailing zeros @@ -518,18 +534,20 @@ public void CanBindTextbox_Decimal_InvalidInput() Browser.Equal("0.01", () => boundValue.Text); Assert.Equal("0.01", mirrorValue.GetAttribute("value")); - // Modify target to something invalid - the invalid value is preserved in the input, the other displays - // don't change and still have the last value valid. - target.SendKeys("A\t"); + // Modify target to something invalid - the invalid change is reverted + // back to the last valid value + target.SendKeys("2A"); + Assert.Equal("0.012A", target.GetAttribute("value")); + target.SendKeys("\t"); Browser.Equal("0.01", () => boundValue.Text); Assert.Equal("0.01", mirrorValue.GetAttribute("value")); - Assert.Equal("0.01A", target.GetAttribute("value")); + Assert.Equal("0.01", target.GetAttribute("value")); - // Modify target to something valid. + // Continue editing with valid inputs target.SendKeys(Keys.Backspace); - target.SendKeys("1\t"); - Browser.Equal("0.011", () => boundValue.Text); - Assert.Equal("0.011", mirrorValue.GetAttribute("value")); + target.SendKeys("2\t"); + Browser.Equal("0.02", () => boundValue.Text); + Assert.Equal("0.02", mirrorValue.GetAttribute("value")); } // This tests what happens you put invalid (unconvertable) input in. This is separate from the @@ -550,18 +568,20 @@ public void CanBindTextbox_NullableDecimal_InvalidInput() Browser.Equal("0.01", () => boundValue.Text); Assert.Equal("0.01", mirrorValue.GetAttribute("value")); - // Modify target to something invalid - the invalid value is preserved in the input, the other displays - // don't change and still have the last value valid. - target.SendKeys("A\t"); + // Modify target to something invalid - the invalid change is reverted + // back to the last valid value + target.SendKeys("2A"); + Assert.Equal("0.012A", target.GetAttribute("value")); + target.SendKeys("\t"); Browser.Equal("0.01", () => boundValue.Text); Assert.Equal("0.01", mirrorValue.GetAttribute("value")); - Assert.Equal("0.01A", target.GetAttribute("value")); + Assert.Equal("0.01", target.GetAttribute("value")); - // Modify target to something valid. + // Continue editing with valid inputs target.SendKeys(Keys.Backspace); - target.SendKeys("1\t"); - Browser.Equal("0.011", () => boundValue.Text); - Assert.Equal("0.011", mirrorValue.GetAttribute("value")); + target.SendKeys("2\t"); + Browser.Equal("0.02", () => boundValue.Text); + Assert.Equal("0.02", mirrorValue.GetAttribute("value")); } [Fact] @@ -574,10 +594,11 @@ public void CanBindTextboxGenericInt() Assert.Equal("-42", boundValue.Text); Assert.Equal("-42", mirrorValue.GetAttribute("value")); - // Modify target; value is not updated because it's not convertable. + // Clear target; value resets to zero target.Clear(); - Browser.Equal("-42", () => boundValue.Text); - Assert.Equal("-42", mirrorValue.GetAttribute("value")); + Browser.Equal("0", () => target.GetAttribute("value")); + Assert.Equal("0", boundValue.Text); + Assert.Equal("0", mirrorValue.GetAttribute("value")); // Modify target; verify value is updated and that textboxes linked to the same data are updated target.SendKeys("42\t"); diff --git a/src/Components/test/E2ETest/Tests/ComponentRenderingTest.cs b/src/Components/test/E2ETest/Tests/ComponentRenderingTest.cs index 59d6c73211a1..204eef9d531f 100644 --- a/src/Components/test/E2ETest/Tests/ComponentRenderingTest.cs +++ b/src/Components/test/E2ETest/Tests/ComponentRenderingTest.cs @@ -617,6 +617,35 @@ public void CanUseAddMultipleAttributes() Assert.Equal("unmatched-value", element.GetAttribute("unmatched")); } + [Fact] + public void CanPatchRenderTreeToMatchLatestDOMState() + { + var appElement = MountTestComponent(); + var incompleteItemsSelector = By.CssSelector(".incomplete-items li"); + var completeItemsSelector = By.CssSelector(".complete-items li"); + WaitUntilExists(incompleteItemsSelector); + + // Mark first item as done; observe the remaining incomplete item appears unchecked + // because the diff algoritm explicitly unchecks it + appElement.FindElement(By.CssSelector(".incomplete-items .item-isdone")).Click(); + Browser.True(() => + { + var incompleteLIs = appElement.FindElements(incompleteItemsSelector); + return incompleteLIs.Count == 1 + && !incompleteLIs[0].FindElement(By.CssSelector(".item-isdone")).Selected; + }); + + // Mark first done item as not done; observe the remaining complete item appears checked + // because the diff algoritm explicitly re-checks it + appElement.FindElement(By.CssSelector(".complete-items .item-isdone")).Click(); + Browser.True(() => + { + var completeLIs = appElement.FindElements(completeItemsSelector); + return completeLIs.Count == 2 + && completeLIs[0].FindElement(By.CssSelector(".item-isdone")).Selected; + }); + } + static IAlert SwitchToAlert(IWebDriver driver) { try diff --git a/src/Components/test/E2ETest/Tests/EventTest.cs b/src/Components/test/E2ETest/Tests/EventTest.cs index 08db99017b85..4e10c10219d5 100644 --- a/src/Components/test/E2ETest/Tests/EventTest.cs +++ b/src/Components/test/E2ETest/Tests/EventTest.cs @@ -185,6 +185,29 @@ public void InputEvent_RespondsOnKeystrokes() Browser.Equal("abcdefghijklmnopqrstuvwxy", () => output.Text); } + [Fact] + public void InputEvent_RespondsOnKeystrokes_EvenIfUpdatesAreLaggy() + { + // This test doesn't mean much on WebAssembly - it just shows that even if the CPU is locked + // up for a bit it doesn't cause typing to lose keystrokes. But when running server-side, this + // shows that network latency doesn't cause keystrokes to be lost even if: + // [1] By the time a keystroke event arrives, the event handler ID has since changed + // [2] We have the situation described under "the problem" at https://github.com/aspnet/AspNetCore/issues/8204#issuecomment-493986702 + + MountTestComponent(); + + var input = Browser.FindElement(By.TagName("input")); + var output = Browser.FindElement(By.Id("test-result")); + + Browser.Equal(string.Empty, () => output.Text); + + SendKeysSequentially(input, "abcdefg"); + Browser.Equal("abcdefg", () => output.Text); + + SendKeysSequentially(input, "hijklmn"); + Browser.Equal("abcdefghijklmn", () => output.Text); + } + void SendKeysSequentially(IWebElement target, string text) { // Calling it for each character works around some chars being skipped diff --git a/src/Components/test/testassets/BasicTestApp/Index.razor b/src/Components/test/testassets/BasicTestApp/Index.razor index addf55f07e10..44afc277f94f 100644 --- a/src/Components/test/testassets/BasicTestApp/Index.razor +++ b/src/Components/test/testassets/BasicTestApp/Index.razor @@ -57,6 +57,8 @@ + + @if (SelectedComponentType != null) diff --git a/src/Components/test/testassets/BasicTestApp/LaggyTypingComponent.razor b/src/Components/test/testassets/BasicTestApp/LaggyTypingComponent.razor new file mode 100644 index 000000000000..3d1598d42476 --- /dev/null +++ b/src/Components/test/testassets/BasicTestApp/LaggyTypingComponent.razor @@ -0,0 +1,39 @@ +@using System.Threading + + +

@InputText

+ +

+ This component introduces lag during typing. It's not precisely the same as network latency, + but is similar enough that it surfaces what would be the same bugs if we didn't have mitigations. + That is: +

    +
  • + Your keystrokes get queued up and by the time they are processed, they no longer match the event + handler ID in the render tree +
    • +
  • + By the time the render output is processed, the textbox contents have already been edited further. +
    • +
+

+

+ The point of this test is to show that even in this hostile environment, we don't break the ability + to type normally, nor do we lose any of your typed characters. +

+ + + +@code { + string _inputText; + + string InputText + { + get => _inputText; + set + { + Thread.Sleep(100); + _inputText = value; + } + } +} diff --git a/src/Components/test/testassets/BasicTestApp/MovingCheckboxesComponent.razor b/src/Components/test/testassets/BasicTestApp/MovingCheckboxesComponent.razor new file mode 100644 index 000000000000..beca5e04d349 --- /dev/null +++ b/src/Components/test/testassets/BasicTestApp/MovingCheckboxesComponent.razor @@ -0,0 +1,56 @@ +

+ This component represents a case that's difficult for the diff algorithm if it doesn't + understand how the underlying DOM gets mutated when you check a box. +

+

+ If we didn't have the RenderTreeUpdater, then if you checked the first incomplete item, + the diff algoritm would see the subsequent render has only one "todo" item left, and would + match it with the existing 'li' element. Since that's still not done, the algorithm would + think no change was needed to the checkbox. But since you just clicked that checkbox, the + UI would show it as checked. It would look as if you have completed all four items instead + of just three. +

+

+ RenderTreeUpdater fixes this by patching the old render tree to match the latest state of + the DOM, so the diff algoritm sees it must explicitly uncheck the remaining 'todo' box. +

+ +

To do

+ +
    + @foreach (var item in items.Where(x => !x.IsDone)) + { +
  • + + @item.Text +
    • + } +
+ +

Done

+ +
    + @foreach (var item in items.Where(x => x.IsDone)) + { +
  • + + @item.Text +
    • + } +
+ +@code { + List items = new List + { + new TodoItem { Text = "Alpha" }, + new TodoItem { Text = "Beta" }, + new TodoItem { Text = "Gamma", IsDone = true }, + new TodoItem { Text = "Delta", IsDone = true }, + }; + + class TodoItem + { + public bool IsDone { get; set; } + public string Text { get; set; } + } +}