Adding 'Select-All' Checkbox in Grid Footer

Environment

Product	Telerik UI for ASP.NET Core Grid
Progress Telerik UI for ASP.NET Core version	Created with the 2023.2.718 version

Description

How can I add a checkbox option in the Telerik UI for ASP.NET Core Grid footer that allows the user to toggle the selection of all rows? This option is useful when the Grid contains many rows, and the user needs to select or unselect all rows when the Grid is scrolled to the bottom.

Solution

1. Define a Select column in the Grid and add a checkbox element in the column's header and footer by using the ClientHeaderTemplate() / ClientFooterTemplate() options. Ensure that each input has a unique id attribute.

       @(Html.Kendo().Grid<Kendo.Mvc.Examples.Models.ProductViewModel>()
           .Name("grid")
           .Columns(columns =>
           {
               columns.Select().Width(50)
               .ClientHeaderTemplate("<input tabindex='-1' id='header-check-all' class='k-select-checkbox k-checkbox k-checkbox-md k-rounded-md' data-role='checkbox' aria-label='Select all rows' type='checkbox'/>")
               .ClientFooterTemplate("<input tabindex='-1' id='footer-check-all' class='k-select-checkbox k-checkbox k-checkbox-md k-rounded-md' data-role='checkbox' aria-label='Select all rows' type='checkbox'/>");
               ...
           })
           .PersistSelection()
           ...
       )
   
   

       @addTagHelper *, Kendo.Mvc
   
       <kendo-grid name="grid" persist-selection="true">
           <columns>
               <column selectable="true" width="50"
                   header-template="<input tabindex='-1' id='header-check-all' class='k-select-checkbox k-checkbox k-checkbox-md k-rounded-md' data-role='checkbox' aria-label='Select all rows' type='checkbox'/>"
                   footer-template="<input tabindex='-1' id='footer-check-all' class='k-select-checkbox k-checkbox k-checkbox-md k-rounded-md' data-role='checkbox' aria-label='Select all rows' type='checkbox'/>">
               </column>
               ...
           </columns>
           ...
       </kendo-grid>
   
   

2. Handle the DataBound event of the Grid and subscribe to the change event of each checkbox input.

       @(Html.Kendo().Grid<Kendo.Mvc.Examples.Models.ProductViewModel>()
           .Name("grid")
           .Events(ev => ev.DataBound("onDataBound"))
           ...
       )
   
   

       @addTagHelper *, Kendo.Mvc
   
       <kendo-grid name="grid" persist-selection="true" on-data-bound="onDataBound">
           ...
       </kendo-grid>
   
   

       function onDataBound(e) {
           let gridInstance = e.sender;
           $(gridInstance.element).find("input#footer-check-all").on("change", function (e) { // Footer checkbox "change" event handler.
               ...
           });
   
           $(gridInstance.element).find("input#header-check-all").on("change", function (e) { // Header checkbox "change" event handler.
               ...
           });
       }
   

3. In the change event handler of the footer checkbox, use the client-side select() and clearSelection() methods to select and unselect the Grid rows.

       function onDataBound(e) {
           let gridInstance = e.sender;
           $(gridInstance.element).find("input#footer-check-all").on("change", function (e) {
               if($(this).is(':checked')) { // If the checkbox is checked
                   let masterRows = $("#grid .k-grid-table .k-master-row"); // Select all Grid rows.
                   gridInstance.select(masterRows);
               } else {
                   gridInstance.clearSelection(); // Clear the selected rows.
               }
           });
   
           $(gridInstance.element).find("input#header-check-all").on("change", function (e) {
               $(gridInstance.element).find("input#footer-check-all").prop('checked', $(this).is(':checked')); // Toggle the footer checkbox based on the header checkbox.
           });
       }
   

For the complete implementation of the suggested approach, refer to the Telerik REPL example on adding 'Select-All' option in the Grid footer.

More ASP.NET Core Grid Resources

• ASP.NET Core Grid Documentation

• ASP.NET Core Grid Demos

• ASP.NET Core Grid Product Page

• Telerik UI for ASP.NET Core Video Onboarding Course (Free for trial users and license holders)

• Telerik UI for ASP.NET Core Forums

See Also

• Client-Side API Reference of the Grid for ASP.NET Core
• Server-Side API Reference of the Grid for ASP.NET Core
• Telerik UI for ASP.NET Core Breaking Changes
• Telerik UI for ASP.NET Core Knowledge Base