blazor-docs/knowledge-base/grid-click-header-template-sorts.md

title	description	type	page_title	slug	position	tags	ticketid	res_type
Prevent clicking in the Grid Header Template from triggering sorting	Clicking in the header template sorts the column - how to stop that	troubleshooting	Prevent clicking in the Grid Header Template from triggering sorting	grid-kb-click-header-template-sorts		grid, column, header, template	1498927	kb

Environment

Product

Grid for Blazor

Description

How to prevent sorting when clicking a specific component in a column header?

I have custom column's grid header template that contains CheckBox and column's title. The column is sortable. The checkbox calls a specific method, but clicking on it also triggers sorting.

I would like to put a TelerikComboBox into a HeaderTemplate of a Grid's column. But when I click into the ComboBox to type something (it's filterable), the header's sorting event hides it and the column will be sorted. How could I solve this?

Possible Cause

The reason behind this behavior is called Event Bubbling, also known as one of the event Propagation phases.

Invoking an event from the child element (TelerikCheckBox in the example below) bubbles up to its parent element (in this case the column header) and also triggers any event called in the parent (sorting, filtering, etc.).

Solution

The way to reduce the bubbling is to use the stopPropagation feature in the child element. That will result in the click event triggering only the desired event from child.

caption How to stop the grid sort when clicking an element in the header template

@* Stopping the Click event from propagating on the clickable elements in your template prevents the grid column from receiving the event and sorting *@

<TelerikGrid Data="@MyData" Height="400px"
             Pageable="true" Sortable="true" 
             FilterMode="Telerik.Blazor.GridFilterMode.FilterRow"
             Resizable="true" Reorderable="true">
    <GridColumns>
        <GridColumn Field="@(nameof(SampleData.Id))" Width="120px"/>
        <GridColumn Field="@(nameof(SampleData.Name))" Title="Employee Name" Groupable="false">
            <HeaderTemplate>
                <div class="row">
                    <div class="col d-flex align-items-center">
                        <div @onclick:stopPropagation="true"
                            
                            style="padding-right: 1rem; cursor: pointer" data-toggle="tooltip" data-placement="bottom" title="Show all elements">
                            <TelerikCheckBox Value="@isChecked" />
                        </div>
                        <span>Elements</span>
                    </div>
                </div>
            </HeaderTemplate>
        </GridColumn>
        <GridColumn Field="@(nameof(SampleData.Team))" Title="Team" />
        <GridColumn Field="@(nameof(SampleData.HireDate))" Title="Hire Date" />
    </GridColumns>
</TelerikGrid>

@code {
    bool isChecked { get; set; }
    public IEnumerable<SampleData> MyData = Enumerable.Range(1, 30).Select(x => new SampleData
    {
        Id = x,
        Name = "name " + x,
        Team = "team " + x % 5,
        HireDate = DateTime.Now.AddDays(-x).Date
    });

    public class SampleData
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Team { get; set; }
        public DateTime HireDate { get; set; }
    }
}