How to Implement CSS Isolation in Blazor Dialog Component?

CSS isolation is a technique used in Blazor applications to scope CSS styles to a specific component, preventing styles from leaking into other parts of the application. This article provides a guide on how to achieve CSS isolation when using the Blazor Dialog component in a Blazor application.

Wrapping the Dialog Component

To isolate the CSS for the Dialog component, you can wrap it within another HTML <div> element. This allows you to target the Dialog component specifically with your styles.

Here’s an example of how to wrap the Dialog component:

[Index.razor]

<div>
<div id="target">
    <div>
        <button class="e-btn" @onclick="@OnBtnClick">Open</button>
    </div>
    <SfDialog Target="#target" Width="300px" ShowCloseIcon="true" @bind-Visible="Visibility" AllowPrerender="true" IsModal="true">
        <DialogTemplates>
            <Header> Dialog </Header>
            <Content> This is a dialog with header </Content>
        </DialogTemplates>
    </SfDialog>
</div>
</div>

<style>
    #target {
        height: 500px;
    }
</style>

@code {
    private bool Visibility { get; set; } = true;
    private void OnBtnClick()
    {
        this.Visibility = true;
    }
}

Applying CSS Isolation

To apply CSS isolation, you can use the ::deep selector in your component-specific CSS file. This selector allows you to target styles within the shadow DOM of the component.

Here’s an example of how to use the ::deep selector:

[Index.razor.css]

::deep .e-dialog .e-dlg-header {
    text-align: center;
}

By using the ::deep selector, you can ensure that the styles for the Dialog’s header are applied only to the Dialog component within the #target element.

Note

It’s important to note that CSS selectors may not directly match the dialog elements within the Blazor component. This is due to the default rendering behavior of the dialog, which utilizes the body as its target.

Additional References

For more information on CSS isolation and how to work with child components, please refer to the following documentation:

• CSS Isolation for Syncfusion Blazor Components
• ASP.NET Core Blazor CSS isolation

By following the steps outlined in this article, you can effectively implement CSS isolation in your Blazor applications, ensuring that your Dialog component and its styles are encapsulated and do not affect other elements in your application.

Conclusion
I hope you enjoyed learning how to implement CSS isolation in Blazor Dialog component.
You can refer to our Blazor Dialog feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Blazor Dialog example to understand how to create and manipulate data.
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