DxDropDown.HeaderCssClass Property

Assigns a CSS class to the header.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public string HeaderCssClass { get; set; }

Property Value

Type	Description
String	CSS class names delimited by spaces.

Remarks

Assign the CSS class name to the HeaderCssClass property to customize the header’s appearance. Use the HeaderText property to specify text displayed in the header.

<style>
    .header-style {
        <!-- your CSS rules -->
    }
</style>

<DxButton Id="showDDbtton" Click="() => IsOpen = true">Show a drop-down window</DxButton>
<DxDropDown HeaderVisible="true"
    HeaderCssClass="header-style"
    HeaderText="Header"
    Width="max(25vw, 300px)"
    BodyText="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris sit amet metus vel
        nisi blandit tincidunt vel efficitur purus. Nunc nec turpis tempus, accumsan orci auctor,
        imperdiet mauris. Fusce id purus magna."
    @bind-IsOpen="@IsOpen"
    PositionTarget="#showDDbtton"
    PositionMode="DropDownPositionMode.Bottom">
</DxDropDown>

@code {
    bool IsOpen { get; set; } = false;
}

When you use the HeaderTextTemplate or HeaderTemplate, specified appearance settings take priority over appearance settings defined in the assigned CSS class.

For more information on how to apply CSS classes to DevExpress Blazor components, refer to the following help topic: CSS Classes.

If your custom CSS ruleset includes only one class selector (.header-style in the code sample above), some property declarations can be ignored. DevExpress themes can apply predefined CSS rules that are more specific and have higher priority than a single-selector rule. Make your rule more specific to increase the priority of your ruleset. See the following help topic for an example: Apply Styles to Components. For more information about how a browser calculates rule priority, refer to the following topic: Understanding the cascade.

You can use the !important flag to override other CSS rules. However, note that this flag modifies the standard behavior of the cascade, which can make troubleshooting CSS issues quite challenging, particularly in large stylesheets.