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+---
+title: Adding Tooltips to Grid Column Headers with Ellipsis in Blazor
+description: Learn how to display tooltips on Blazor Grid column headers when the text is truncated due to column resizing.
+type: how-to
+page_title: How to Show Tooltips on Truncated Grid Column Headers in Blazor
+slug: grid-kb-show-tooltip-on-column-header
+tags: grid, blazor, tooltip, column header, template, ellipsis
+res_type: kb
+ticketid: 1677858
+---
+
+## Description
+
+When the column headers in a [Telerik Grid for Blazor](slug:grid-overview) are too long for the column width, they may be truncated with an ellipsis. In such cases, adding tooltips to the headers can help display the full text.
+
+This knowledge-base article also answers the following questions:
+
+- How to add Tooltip to Grid column header in Blazor?
+- How to show Tooltip only for truncated column headers in a Blazor Grid?
+- How to customize Grid column headers in Blazor?
+
+## Solution
+
+To display Tooltip for Grid column headers that are truncated, follow the steps below:
+
+1. Use the [Column Header Template](slug:components/grid/templates/column-header#column-header-template) to customize the header content. Wrap the header content in a `<span>` HTML element.
+2. [Monitor the column width changes](slug:grid-kb-column-state) by using the [Grid `OnStateChanged` event](slug:components/grid/state#onstatechanged) and the [`ColumnState`](slug:components/grid/state#information-in-the-grid-state) property of the `GridState`.
+3. Use a [TelerikTooltip](slug:components/tooltip/overview) component to display tooltip for each column header.
+4. Apply a custom CSS class to the column header content when the width of the column is insufficient to display its full content.
+
+>caption Show TelerikTooltip on the Grid column header
+
+````RAZOR
+<p><strong>Resize and shrink some columns to observe the expected result</strong></p>.
+
+<TelerikGrid @ref="@GridRef"
+             Data="@MyData"
+             Reorderable="true"
+             Resizable="true"
+             OnStateChanged="@((GridStateEventArgs<SampleData> args) => HandleColumnWidthChange(args))"
+             Width="510px">
+    <GridColumns>
+        <GridColumn Field="@nameof(SampleData.Id)" Width="130px">
+            <HeaderTemplate>
+                <span title="Unique Identifier"
+                      class="@(ShowTooltip.GetValueOrDefault(nameof(SampleData.Id), false) ? "employee-header" : "")">
+                    Unique Identifier
+                </span>
+            </HeaderTemplate>
+        </GridColumn>
+
+        <GridColumn Field="@(nameof(SampleData.Name))" Width="165px">
+            <HeaderTemplate>
+                <span title="Long Employee Name"
+                      class="@(ShowTooltip.GetValueOrDefault(nameof(SampleData.Name), false) ? "employee-header" : "")">
+                    Long Employee Name
+                </span>
+            </HeaderTemplate>
+        </GridColumn>
+
+        <GridColumn Field="@(nameof(SampleData.Team))" Width="210px">
+            <HeaderTemplate>
+                <span title="Extremely Long Team Name"
+                      class="@(ShowTooltip.GetValueOrDefault(nameof(SampleData.Team), false) ? "employee-header" : "")">
+                    Extremely Long Team Name
+                </span>
+            </HeaderTemplate>
+        </GridColumn>
+    </GridColumns>
+</TelerikGrid>
+
+<TelerikTooltip TargetSelector=".employee-header" Class="my-callout">
+</TelerikTooltip>
+
+<style>
+    .my-callout .k-callout {
+        left: 30px !important;
+    }
+</style>
+
+@code {
+    private TelerikGrid<SampleData>? GridRef { get; set; }
+
+    private IEnumerable<SampleData> MyData = Enumerable.Range(1, 10).Select(x => new SampleData
+        {
+            Id = x,
+            Name = $"Name {x}",
+            Team = $"Team {x % 3 + 1}"
+        });
+
+    // Define minimum width requirements for tooltips
+    private static readonly Dictionary<string, double> MinColumnWidths = new()
+    {
+        { nameof(SampleData.Id), 125 },
+        { nameof(SampleData.Name), 160 },
+        { nameof(SampleData.Team), 205 }
+    };
+
+    // Store whether a tooltip should be shown for each column
+    private Dictionary<string, bool> ShowTooltip = new();
+
+    private async Task HandleColumnWidthChange(GridStateEventArgs<SampleData> args)
+    {
+        foreach (var column in args.GridState.ColumnStates)
+        {
+            string columnField = column.Field;
+            if (MinColumnWidths.TryGetValue(columnField, out double minWidth))
+            {
+                double currentWidth = double.Parse(column.Width.Replace("px", ""));
+                ShowTooltip[columnField] = currentWidth < minWidth;
+            }
+        }
+
+        await GridRef!.SetStateAsync(args.GridState);
+    }
+
+    public class SampleData
+    {
+        public int Id { get; set; }
+        public string Name { get; set; } = string.Empty;
+        public string Team { get; set; } = string.Empty;
+    }
+}
+````
+
+> The additional CSS is used to adjust the position of the tooltip callout. Modify this CSS based on your application's specific layout and design requirements.
+
+## See Also
+- [Grid Column Header Template Documentation](slug:components/grid/templates/column-header#column-header-template)
+- [Telerik Tooltip Overview](slug:components/tooltip/overview)
+- [Tooltip Template Feature](slug:components/tooltip/template)
+- [Hide the Tooltip Callout or Change Its Position](slug:tooltip-callout-position)
+- [Show Tooltip in Grid](slug:tooltip-in-grid)