From 2d84cf5e7455b203a2b4d8c21925942a25ed03d9 Mon Sep 17 00:00:00 2001
From: Svetoslav Dimitrov <svdimitr@progress.com>
Date: Fri, 12 Jun 2020 14:18:03 +0300
Subject: [PATCH 1/3] kb(grid): Troubleshooting of the Virtual Scrolling
 feature of the Grid

---
 .../grid-virtual-scrolling-troubleshooting.md |  39 ++++++++++++++++++
 .../virtual-scrolling-loading-indicator.png   | Bin 0 -> 17869 bytes
 2 files changed, 39 insertions(+)
 create mode 100644 knowledge-base/grid-virtual-scrolling-troubleshooting.md
 create mode 100644 knowledge-base/images/virtual-scrolling-loading-indicator.png

diff --git a/knowledge-base/grid-virtual-scrolling-troubleshooting.md b/knowledge-base/grid-virtual-scrolling-troubleshooting.md
new file mode 100644
index 0000000000..ce1ee6a65c
--- /dev/null
+++ b/knowledge-base/grid-virtual-scrolling-troubleshooting.md
@@ -0,0 +1,39 @@
+---
+title: Virtual Scrolling - Troubleshooting
+description: Troubleshoot errors when Virtual Scrolling is enabled
+type: troubleshooting
+page_title: Virtual Scrolling - Troubleshooting
+slug: grid-kb-virtual-scrolling-troubleshooting
+position:
+tags:
+res_type: kb
+---
+
+## Environment
+<table>
+	<tbody>
+		<tr>
+			<td>Product</td>
+			<td>Grid for Blazor</td>
+		</tr>
+	</tbody>
+</table>
+
+
+## Description
+I have a Grid with [Virtual Scrolling]({%slug components/grid/virtual-scrolling%}) enabled. When I scroll up or down the rows for the current view port are not rendered as the loading indicator remains visible as shown in the image below.
+
+
+![](images/virtual-scrolling-loading-indicator.png)
+
+
+## Cause\Possible Cause(s)
+
+There are several possible causes to that behavior:
+* The rendered row height in the browser is larger than the value set to the `RowHeight` parameter of the Grid. This depends on the used Theme and / or custom CSS rules applied to the `<tr>` HTML tag.
+* The `RowHeight` parameter changes on runtime. Changing the height of the row dynamically depending on the content will cause issues with the virtualization logic.
+* The browser and monitor settings do not match the settings of the Grid. Different browser zoom levels and monitor DPI can cause the browser to render with unexpected dimensions and / or non-integer values of the `<tr>`.
+
+
+## Solution
+Set the `RowHeight` parameter to a fixed value in pixels so that it accommodates the content (depending on the padding, margins, font-size and etc. Theme and CSS related rules) and matches the monitor and browser settings.
diff --git a/knowledge-base/images/virtual-scrolling-loading-indicator.png b/knowledge-base/images/virtual-scrolling-loading-indicator.png
new file mode 100644
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From 44266ae45c7bbc14bb6f490013c58f89451d8093 Mon Sep 17 00:00:00 2001
From: Svetoslav Dimitrov <svdimitr@progress.com>
Date: Fri, 12 Jun 2020 14:37:36 +0300
Subject: [PATCH 2/3] chore(grid): updated virtual row troubleshooting article

---
 .../grid-virtual-scrolling-troubleshooting.md |  52 +++++++++++++++++-
 .../virtual-scrolling-loading-indicator.png   | Bin 17869 -> 12292 bytes
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/knowledge-base/grid-virtual-scrolling-troubleshooting.md b/knowledge-base/grid-virtual-scrolling-troubleshooting.md
index ce1ee6a65c..f6e8ebeb28 100644
--- a/knowledge-base/grid-virtual-scrolling-troubleshooting.md
+++ b/knowledge-base/grid-virtual-scrolling-troubleshooting.md
@@ -32,7 +32,57 @@ I have a Grid with [Virtual Scrolling]({%slug components/grid/virtual-scrolling%
 There are several possible causes to that behavior:
 * The rendered row height in the browser is larger than the value set to the `RowHeight` parameter of the Grid. This depends on the used Theme and / or custom CSS rules applied to the `<tr>` HTML tag.
 * The `RowHeight` parameter changes on runtime. Changing the height of the row dynamically depending on the content will cause issues with the virtualization logic.
-* The browser and monitor settings do not match the settings of the Grid. Different browser zoom levels and monitor DPI can cause the browser to render with unexpected dimensions and / or non-integer values of the `<tr>`.
+* The browser and monitor settings do not match the settings of the Grid. Different browser zoom levels and monitor DPI (not set to 100%) can cause the browser to render with unexpected dimensions and / or non-integer values of the `<tr>`.
+
+>caption Typical PROBLEMATIC example when using Virtual Scrolling
+
+````CSHTML
+@*This example showcases typical situation when the Virtual Scrolling will break*@
+
+<TelerikGrid Data=@GridData
+             ScrollMode="@GridScrollMode.Virtual"
+             Height="480px" RowHeight="20" PageSize="20"
+             Sortable="true" FilterMode="@GridFilterMode.FilterMenu">
+    <GridColumns>
+        <GridColumn Field="Id" />
+        <GridColumn Field="Name" Title="First Name" />
+        <GridColumn Field="LastName" Title="Last Name" />
+        <GridColumn Field="HireData" Width="200px">
+            <Template>
+                @((context as SampleData).HireDate.ToString("MMMM dd, yyyy"))
+            </Template>
+        </GridColumn>
+    </GridColumns>
+</TelerikGrid>
+
+@code {
+    public List<SampleData> GridData { get; set; }
+
+    protected override async Task OnInitializedAsync()
+    {
+        GridData = await GetData();
+    }
+
+    private async Task<List<SampleData>> GetData()
+    {
+        return Enumerable.Range(1, 1000).Select(x => new SampleData
+        {
+            Id = x,
+            Name = $"name {x}",
+            LastName = $"Surname {x}",
+            HireDate = DateTime.Now.Date.AddDays(-x)
+        }).ToList();
+    }
+
+    public class SampleData
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public string LastName { get; set; }
+        public DateTime HireDate { get; set; }
+    }
+}
+````
 
 
 ## Solution
diff --git a/knowledge-base/images/virtual-scrolling-loading-indicator.png b/knowledge-base/images/virtual-scrolling-loading-indicator.png
index 477de7b77baac1fb69ff0fff6d53c54ae914eb4e..be89a9f343fc933d33cacc9ddba294e328120c04 100644
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From 9460b3a51acf97d7351ecd6b007ae91910f0e177 Mon Sep 17 00:00:00 2001
From: Marin Bratanov <m.bratanov@gmail.com>
Date: Fri, 12 Jun 2020 17:46:56 +0300
Subject: [PATCH 3/3] chore(kb): grid virtual scrolling kb optimizations

---
 ... => grid-virtual-scrolling-not-working.md} | 27 ++++++++++++-------
 1 file changed, 18 insertions(+), 9 deletions(-)
 rename knowledge-base/{grid-virtual-scrolling-troubleshooting.md => grid-virtual-scrolling-not-working.md} (71%)

diff --git a/knowledge-base/grid-virtual-scrolling-troubleshooting.md b/knowledge-base/grid-virtual-scrolling-not-working.md
similarity index 71%
rename from knowledge-base/grid-virtual-scrolling-troubleshooting.md
rename to knowledge-base/grid-virtual-scrolling-not-working.md
index f6e8ebeb28..cc45b5b856 100644
--- a/knowledge-base/grid-virtual-scrolling-troubleshooting.md
+++ b/knowledge-base/grid-virtual-scrolling-not-working.md
@@ -1,8 +1,8 @@
 ---
-title: Virtual Scrolling - Troubleshooting
-description: Troubleshoot errors when Virtual Scrolling is enabled
+title: Virtual Scrolling Does Not Work
+description: How to fix Virtual Scrolling does not work and does not load data
 type: troubleshooting
-page_title: Virtual Scrolling - Troubleshooting
+page_title: Virtual Scrolling - Not Working
 slug: grid-kb-virtual-scrolling-troubleshooting
 position:
 tags:
@@ -23,16 +23,20 @@ res_type: kb
 ## Description
 I have a Grid with [Virtual Scrolling]({%slug components/grid/virtual-scrolling%}) enabled. When I scroll up or down the rows for the current view port are not rendered as the loading indicator remains visible as shown in the image below.
 
+>caption A depiction of the problem and symptom
 
 ![](images/virtual-scrolling-loading-indicator.png)
 
 
 ## Cause\Possible Cause(s)
 
-There are several possible causes to that behavior:
-* The rendered row height in the browser is larger than the value set to the `RowHeight` parameter of the Grid. This depends on the used Theme and / or custom CSS rules applied to the `<tr>` HTML tag.
+There are several common causes for that behavior:
+
+* The rendered row height in the browser does not match the value set to the `RowHeight` parameter of the Grid. This depends on the used Theme and / or custom CSS rules applied to the `<tr>` HTML tag.
+
 * The `RowHeight` parameter changes on runtime. Changing the height of the row dynamically depending on the content will cause issues with the virtualization logic.
-* The browser and monitor settings do not match the settings of the Grid. Different browser zoom levels and monitor DPI (not set to 100%) can cause the browser to render with unexpected dimensions and / or non-integer values of the `<tr>`.
+
+* The browser and monitor settings do not match the settings of the Grid. Different browser zoom levels and monitor DPI (not set to 100%) can cause the browser to render the rows with unexpected dimensions and / or non-integer values of the `<tr>`.
 
 >caption Typical PROBLEMATIC example when using Virtual Scrolling
 
@@ -41,8 +45,11 @@ There are several possible causes to that behavior:
 
 <TelerikGrid Data=@GridData
              ScrollMode="@GridScrollMode.Virtual"
-             Height="480px" RowHeight="20" PageSize="20"
-             Sortable="true" FilterMode="@GridFilterMode.FilterMenu">
+             Height="480px" 
+             
+             RowHeight="20"
+             
+             PageSize="20" Sortable="true" FilterMode="@GridFilterMode.FilterMenu">
     <GridColumns>
         <GridColumn Field="Id" />
         <GridColumn Field="Name" Title="First Name" />
@@ -86,4 +93,6 @@ There are several possible causes to that behavior:
 
 
 ## Solution
-Set the `RowHeight` parameter to a fixed value in pixels so that it accommodates the content (depending on the padding, margins, font-size and etc. Theme and CSS related rules) and matches the monitor and browser settings.
+Set the `RowHeight` parameter to a fixed value in pixels so that it accommodates the content (depending on the content, padding, margins, font-size and other rules and settings on your app such the Theme and CSS related rules) and matches the monitor and browser settings.
+
+You can read more in the [Notes section of the Virtual Scrolling article]({%slug components/grid/virtual-scrolling%}).