Introduce tracking of used and unused inputs with error message filtering

assets/js/phoenix_live_view/constants.js

@@ -37,8 +37,6 @@ export const PHX_ROOT_ID = "data-phx-root-id"
 export const PHX_VIEWPORT_TOP = "viewport-top"
 export const PHX_VIEWPORT_BOTTOM = "viewport-bottom"
 export const PHX_TRIGGER_ACTION = "trigger-action"
-export const PHX_FEEDBACK_FOR = "feedback-for"
-export const PHX_FEEDBACK_GROUP = "feedback-group"
 export const PHX_HAS_FOCUSED = "phx-has-focused"
 export const FOCUSABLE_INPUTS = ["text", "textarea", "number", "email", "password", "search", "tel", "url", "date", "time", "datetime-local", "color", "range"]
 export const CHECKABLE_INPUTS = ["checkbox", "radio"]

assets/js/phoenix_live_view/dom.js

@@ -340,6 +340,11 @@ let DOM = {
     JS.addOrRemoveClasses(container, [PHX_NO_FEEDBACK_CLASS], [])
   },
 
+  isUsedInput(el){
+    return(el.nodeType === Node.ELEMENT_NODE &&
+      (this.private(el, PHX_HAS_FOCUSED) || this.private(el, PHX_HAS_SUBMITTED)))
+  },
+
   shouldHideFeedback(container, nameOrGroup, phxFeedbackGroup){
     const query = `[name="${nameOrGroup}"],
                    [name="${nameOrGroup}[]"],
@@ -362,14 +367,10 @@ let DOM = {
     return query
   },
 
-  resetForm(form, phxFeedbackFor, phxFeedbackGroup){
+  resetForm(form){
     Array.from(form.elements).forEach(input => {
-      let query = this.feedbackSelector(input, phxFeedbackFor, phxFeedbackGroup)
       this.deletePrivate(input, PHX_HAS_FOCUSED)
       this.deletePrivate(input, PHX_HAS_SUBMITTED)
-      this.all(document, query, feedbackEl => {
-        JS.addOrRemoveClasses(feedbackEl, [PHX_NO_FEEDBACK_CLASS], [])
-      })
     })
   },
 

assets/js/phoenix_live_view/dom_patch.js

@@ -1,8 +1,6 @@
 import {
   PHX_COMPONENT,
   PHX_DISABLE_WITH,
-  PHX_FEEDBACK_FOR,
-  PHX_FEEDBACK_GROUP,
   PHX_PRUNE,
   PHX_ROOT_ID,
   PHX_SESSION,
@@ -53,6 +51,7 @@ export default class DOMPatch {
     this.cidPatch = isCid(this.targetCID)
     this.pendingRemoves = []
     this.phxRemove = this.liveSocket.binding("remove")
+    this.targetContainer = this.isCIDPatch() ? this.targetCIDContainer(html) : container
     this.callbacks = {
       beforeadded: [], beforeupdated: [], beforephxChildAdded: [],
       afteradded: [], afterupdated: [], afterdiscarded: [], afterphxChildAdded: [],
@@ -79,21 +78,17 @@ export default class DOMPatch {
   }
 
   perform(isJoinPatch){
-    let {view, liveSocket, container, html} = this
-    let targetContainer = this.isCIDPatch() ? this.targetCIDContainer(html) : container
+    let {view, liveSocket, html, container, targetContainer} = this
     if(this.isCIDPatch() && !targetContainer){ return }
 
     let focused = liveSocket.getActiveElement()
     let {selectionStart, selectionEnd} = focused && DOM.hasSelectionRange(focused) ? focused : {}
     let phxUpdate = liveSocket.binding(PHX_UPDATE)
-    let phxFeedbackFor = liveSocket.binding(PHX_FEEDBACK_FOR)
-    let phxFeedbackGroup = liveSocket.binding(PHX_FEEDBACK_GROUP)
     let disableWith = liveSocket.binding(PHX_DISABLE_WITH)
     let phxViewportTop = liveSocket.binding(PHX_VIEWPORT_TOP)
     let phxViewportBottom = liveSocket.binding(PHX_VIEWPORT_BOTTOM)
     let phxTriggerExternal = liveSocket.binding(PHX_TRIGGER_ACTION)
     let added = []
-    let feedbackContainers = []
     let updates = []
     let appendPrependUpdates = []
 
@@ -144,7 +139,6 @@ export default class DOMPatch {
         },
         onNodeAdded: (el) => {
           if(el.getAttribute){ this.maybeReOrderStream(el, true) }
-          if(DOM.isFeedbackContainer(el, phxFeedbackFor)) feedbackContainers.push(el)
 
           // hack to fix Safari handling of img srcset and video tags
           if(el instanceof HTMLImageElement && el.srcset){
@@ -183,12 +177,6 @@ export default class DOMPatch {
         },
         onBeforeElUpdated: (fromEl, toEl) => {
           DOM.maybeAddPrivateHooks(toEl, phxViewportTop, phxViewportBottom)
-          // mark both from and to els as feedback containers, as we don't know yet which one will be used
-          // and we also need to remove the phx-no-feedback class when the phx-feedback-for attribute is removed
-          if(DOM.isFeedbackContainer(fromEl, phxFeedbackFor) || DOM.isFeedbackContainer(toEl, phxFeedbackFor)){
-            feedbackContainers.push(fromEl)
-            feedbackContainers.push(toEl)
-          }
           DOM.cleanChildNodes(toEl, phxUpdate)
           if(this.skipCIDSibling(toEl)){
             // if this is a live component used in a stream, we may need to reorder it
@@ -297,8 +285,6 @@ export default class DOMPatch {
       })
     }
 
-    DOM.maybeHideFeedback(targetContainer, feedbackContainers, phxFeedbackFor, phxFeedbackGroup)
-
     liveSocket.silenceEvents(() => DOM.restoreFocus(focused, selectionStart, selectionEnd))
     DOM.dispatchEvent(document, "phx:update")
     added.forEach(el => this.trackAfter("added", el))

assets/js/phoenix_live_view/index.js

@@ -7,7 +7,8 @@ See the hexdocs at `https://hexdocs.pm/phoenix_live_view` for documentation.
 
 */
 
-import LiveSocket from "./live_socket"
+import LiveSocket, {isUsedInput} from "./live_socket"
 export {
-  LiveSocket
+  LiveSocket,
+  isUsedInput
 }

assets/js/phoenix_live_view/live_socket.js

@@ -95,8 +95,6 @@ import {
   PHX_THROTTLE,
   PHX_TRACK_UPLOADS,
   PHX_SESSION,
-  PHX_FEEDBACK_FOR,
-  PHX_FEEDBACK_GROUP,
   RELOAD_JITTER_MIN,
   RELOAD_JITTER_MAX,
   PHX_REF,
@@ -117,6 +115,8 @@ import LiveUploader from "./live_uploader"
 import View from "./view"
 import JS from "./js"
 
+export let isUsedInput = (el) => DOM.isUsedInput(el)
+
 export default class LiveSocket {
   constructor(url, phxSocket, opts = {}){
     this.unloaded = false
@@ -158,7 +158,12 @@ export default class LiveSocket {
     this.localStorage = opts.localStorage || window.localStorage
     this.sessionStorage = opts.sessionStorage || window.sessionStorage
     this.boundTopLevelEvents = false
-    this.domCallbacks = Object.assign({onNodeAdded: closure(), onBeforeElUpdated: closure()}, opts.dom || {})
+    this.domCallbacks = Object.assign({
+      onPatchStart: closure(),
+      onPatchEnd: closure(),
+      onNodeAdded: closure(),
+      onBeforeElUpdated: closure()},
+    opts.dom || {})
     this.transitions = new TransitionSet()
     window.addEventListener("pagehide", _e => {
       this.unloaded = true
@@ -173,6 +178,8 @@ export default class LiveSocket {
 
   // public
 
+  isUsedInput(el){ return isUsedInput(el) }
+
   isProfileEnabled(){ return this.sessionStorage.getItem(PHX_LV_PROFILE) === "true" }
 
   isDebugEnabled(){ return this.sessionStorage.getItem(PHX_LV_DEBUG) === "true" }
@@ -880,7 +887,7 @@ export default class LiveSocket {
     }
     this.on("reset", (e) => {
       let form = e.target
-      DOM.resetForm(form, this.binding(PHX_FEEDBACK_FOR), this.binding(PHX_FEEDBACK_GROUP))
+      DOM.resetForm(form)
       let input = Array.from(form.elements).find(el => el.type === "reset")
       if(input){
         // wait until next tick to get updated input value

assets/js/phoenix_live_view/view.js

@@ -13,8 +13,6 @@ import {
   PHX_ERROR_CLASS,
   PHX_CLIENT_ERROR_CLASS,
   PHX_SERVER_ERROR_CLASS,
-  PHX_FEEDBACK_FOR,
-  PHX_FEEDBACK_GROUP,
   PHX_HAS_FOCUSED,
   PHX_HAS_SUBMITTED,
   PHX_HOOK,
@@ -57,6 +55,17 @@ import Rendered from "./rendered"
 import ViewHook from "./view_hook"
 import JS from "./js"
 
+export let prependFormDataKey = (key, prefix) => {
+  let isArray = key.endsWith("[]")
+  // Remove the "[]" if it's an array
+  let baseKey = isArray ? key.slice(0, -2) : key
+  // Replace last occurrence of key before a closing bracket or the end with key plus suffix
+  baseKey = baseKey.replace(/(\w+)(\]?$)/, `${prefix}$1$2`)
+  // Add back the "[]" if it was an array
+  if(isArray){ baseKey += "[]" }
+  return baseKey
+}
+
 let serializeForm = (form, metadata, onlyNames = []) => {
   const {submitter, ...meta} = metadata
 
@@ -90,8 +99,14 @@ let serializeForm = (form, metadata, onlyNames = []) => {
 
   const params = new URLSearchParams()
 
+  let elements = Array.from(form.elements)
   for(let [key, val] of formData.entries()){
     if(onlyNames.length === 0 || onlyNames.indexOf(key) >= 0){
+      let input = elements.find(input => input.name === key)
+      let isUnused = !(DOM.private(input, PHX_HAS_FOCUSED) || DOM.private(input, PHX_HAS_SUBMITTED))
+      if(isUnused && !(submitter && submitter.name == key)){
+        params.append(prependFormDataKey(key, "_unused_"), "")
+      }
       params.append(key, val)
     }
   }
@@ -416,6 +431,8 @@ export default class View {
     let phxChildrenAdded = false
     let updatedHookIds = new Set()
 
+    this.liveSocket.triggerDOM("onPatchStart", [patch.targetContainer])
+
     patch.after("added", el => {
       this.liveSocket.triggerDOM("onNodeAdded", [el])
       let phxViewportTop = this.binding(PHX_VIEWPORT_TOP)
@@ -450,6 +467,8 @@ export default class View {
     patch.perform(isJoinPatch)
     this.afterElementsRemoved(removedEls, pruneCids)
 
+
+    this.liveSocket.triggerDOM("onPatchEnd", [patch.targetContainer])
     return phxChildrenAdded
   }
 
@@ -951,7 +970,6 @@ export default class View {
       cid: cid
     }
     this.pushWithReply(refGenerator, "event", event, resp => {
-      DOM.showError(inputEl, this.liveSocket.binding(PHX_FEEDBACK_FOR), this.liveSocket.binding(PHX_FEEDBACK_GROUP))
       if(DOM.isUploadInput(inputEl) && DOM.isAutoUpload(inputEl)){
         if(LiveUploader.filesAwaitingPreflight(inputEl).length > 0){
           let [ref, _els] = refGenerator()
@@ -1256,13 +1274,10 @@ export default class View {
 
   submitForm(form, targetCtx, phxEvent, submitter, opts = {}){
     DOM.putPrivate(form, PHX_HAS_SUBMITTED, true)
-    const phxFeedbackFor = this.liveSocket.binding(PHX_FEEDBACK_FOR)
-    const phxFeedbackGroup = this.liveSocket.binding(PHX_FEEDBACK_GROUP)
     const inputs = Array.from(form.elements)
     inputs.forEach(input => DOM.putPrivate(input, PHX_HAS_SUBMITTED, true))
     this.liveSocket.blurActiveElement(this)
     this.pushFormSubmit(form, targetCtx, phxEvent, submitter, opts, () => {
-      inputs.forEach(input => DOM.showError(input, phxFeedbackFor, phxFeedbackGroup))
       this.liveSocket.restorePreviouslyActiveFocus()
     })
   }

assets/test/js_test.js

@@ -332,7 +332,7 @@ describe("JS", () => {
       expect(Array.from(modal2.classList)).toEqual(["modal", "class1"])
       JS.exec("click", toggle.getAttribute("phx-click"), view, toggle)
       jest.runAllTimers()
-      
+
       expect(Array.from(modal1.classList)).toEqual(["modal"])
       expect(Array.from(modal2.classList)).toEqual(["modal"])
       done()
@@ -398,7 +398,7 @@ describe("JS", () => {
           event: "validate",
           type: "form",
           uploads: {},
-          value: "username=&other=&_target=username"
+          value: "_unused_username=&username=&_unused_other=&other=&_target=username"
         })
         done()
       }
@@ -429,7 +429,7 @@ describe("JS", () => {
           event: "username_changed",
           type: "form",
           uploads: {},
-          value: "username=&_target=username"
+          value: "_unused_username=&username=&_target=username"
         })
         done()
       }
@@ -460,7 +460,7 @@ describe("JS", () => {
           event: "username_changed",
           type: "form",
           uploads: {},
-          value: "username=&_target=username"
+          value: "_unused_username=&username=&_target=username"
         })
         done()
       }