890806: Added documentation for exception handling

Author: Karthikeyanthangarajsf3938

ej2-asp-core-mvc/code-snippet/tree-grid/getting-start-core/error-handling/errorHandling.cs

@@ -0,0 +1,6 @@
+public IActionResult Index()
+{
+    var tree = TreeData.GetDefaultData();
+    ViewBag.dataSource = tree;
+    return View();
+}

ej2-asp-core-mvc/code-snippet/tree-grid/getting-start-core/error-handling/tagHelper

@@ -0,0 +1,17 @@
+<ejs-treegrid id="TreeGrid" dataSource="@ViewBag.dataSource" height="400" childMapping="Children" treeColumnIndex="1" actionFailure="actionFailure" >
+    <e-treegrid-editsettings allowAdding="true" allowEditing="true" allowDeleting="true"></e-treegrid-editsettings>
+    <e-treegrid-columns>
+        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="100"></e-treegrid-column>
+        <e-treegrid-column field="TaskName" headerText="Task Name" editType="stringedit" width="190"></e-treegrid-column>
+        <e-treegrid-column field="StartDate" headerText="Start Date" editType="datepickeredit" textAlign="Right" format="yMd" type="date" width="130"></e-treegrid-column>
+        <e-treegrid-column field="Duration" headerText="Duration" editType="numericedit" textAlign="Right" width="120"></e-treegrid-column>
+    </e-treegrid-columns>
+</ejs-treegrid>
+<script>
+    function actionFailure(e) {
+       var span = document.createElement('span');
+       this.element.parentNode.insertBefore(span, this.element);
+       span.style.color = '#FF0000'
+       span.innerHTML = e.error[0];
+    }
+</script>

ej2-asp-core-mvc/code-snippet/tree-grid/getting-start-mvc/error-handling/errorHandling.cs

@@ -0,0 +1,93 @@
+public class HomeController : Controller
+{
+    public ActionResult Index()
+    {
+        return View(TreeGridItems.GetTreeData());
+    }
+}
+public class TreeGridItems
+{
+    public TreeGridItems() { }
+    public int TaskId { get; set; }
+    public string TaskName { get; set; }
+    public DateTime StartDate { get; set; }
+    public int Duration { get; set; }
+    public List<TreeGridItems> Children { get; set; }
+
+    public static List<TreeGridItems> GetTreeData()
+    {
+        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();
+
+        TreeGridItems Record1 = null;
+
+        Record1 = new TreeGridItems()
+        {
+            TaskId = 1,
+            TaskName = "Planning",
+            StartDate = new DateTime(2016, 06, 07),
+            Duration = 5,
+            Children = new List<TreeGridItems>(),
+        };
+        TreeGridItems Child1 = new TreeGridItems()
+        {
+            TaskId = 2,
+            TaskName = "Plan timeline",
+            StartDate = new DateTime(2016, 06, 07),
+            Duration = 5
+        };
+
+        TreeGridItems Child2 = new TreeGridItems()
+        {
+            TaskId = 3,
+            TaskName = "Plan budget",
+            StartDate = new DateTime(2016, 06, 07),
+            Duration = 5
+        };
+        TreeGridItems Child3 = new TreeGridItems()
+        {
+            TaskId = 4,
+            TaskName = "Allocate resources",
+            StartDate = new DateTime(2016, 06, 07),
+            Duration = 5
+        };
+        Record1.Children.Add(Child1);
+        Record1.Children.Add(Child2);
+        Record1.Children.Add(Child3);
+        TreeGridItems Record2 = new TreeGridItems()
+        {
+            TaskId = 6,
+            TaskName = "Design",
+            StartDate = new DateTime(2021, 08, 25),
+            Duration = 3,
+            Children = new List<TreeGridItems>()
+        };
+        TreeGridItems Child5 = new TreeGridItems()
+        {
+            TaskId = 7,
+            TaskName = "Software Specification",
+            StartDate = new DateTime(2021, 08, 25),
+            Duration = 3
+        };
+
+        TreeGridItems Child6 = new TreeGridItems()
+        {
+            TaskId = 8,
+            TaskName = "Develop prototype",
+            StartDate = new DateTime(2021, 08, 25),
+            Duration = 3
+        };
+        TreeGridItems Child7 = new TreeGridItems()
+        {
+            TaskId = 9,
+            TaskName = "Get approval from customer",
+            StartDate = new DateTime(2024, 06, 27),
+            Duration = 2
+        };
+        Record2.Children.Add(Child5);
+        Record2.Children.Add(Child6);
+        Record2.Children.Add(Child7);
+        BusinessObjectCollection.Add(Record1);
+        BusinessObjectCollection.Add(Record2);
+        return BusinessObjectCollection;
+    }
+}

ej2-asp-core-mvc/code-snippet/tree-grid/getting-start-mvc/error-handling/razor

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+@using Syncfusion.EJ2.Grids
+@model List<TreeGridSample.Controllers.TreeGridItems>
+
+@(Html.EJS().TreeGrid("TreeGrid").DataSource((IEnumerable<object>)ViewBag.datasource)
+      .EditSettings(edit =>
+       {
+          edit.AllowAdding(true);
+          edit.AllowDeleting(true);
+          edit.AllowEditing(true);
+       })
+       .Columns(col =>
+        {
+           col.Field("TaskId").HeaderText("Task ID").Width(120)
+              .TextAlign(TextAlign.Right).Add();
+           col.Field("TaskName").HeaderText("Task Name").Add();
+           col.Field("StartDate").HeaderText("Start Date").Width(150).Format("yMd")
+              .EditType("datepickeredit").TextAlign(TextAlign.Right).Add();
+           col.Field("Duration").HeaderText("Duration").Width("110").EditType("numericedit")
+               .Edit(new { @params = new { format = "n" } }).TextAlign(TextAlign.Right).Add();
+
+        }).Height(400).ChildMapping("Children").ActionFailure("actionFailure").TreeColumnIndex(1).Render())
+
+         < script >
+            function actionFailure(args) {
+               var treegrid = document.getElementById("TreeGrid").ej2_instances[0];
+               var span = document.createElement('span');
+               treegrid.element.parentNode.insertBefore(span, treegrid.element);
+               span.style.color = '#FF0000'
+               span.innerHTML = args.error[0];
+            }
+         </ script >