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Discover How to Use Blazor to Create a Basic Dialog Box

Posted on by Pablo Francesco

With Blazor, creating a Dialog Box is easy. Dialog boxes used to be a place where you could ask the user for specific information to complete a task or provide confirmation.

A button to open the dialog and a button to close it are included in the example I’m using for the article.

This code will be immediately added to the razor page. CSS can be used to decorate the dialog. The dialog box’s content needs to align with the program requirements that you are developing.

The tag for the dialog box is “dialog”, and you can add the events, ID, and other specific needs.

<style>
    dialog {
        border: 1px solid black;
        padding: 1rem;
        width: 440px;
        height: 200px;
    }
</style>

<div>
    <p>Output: @message</p>

    <button onclick="document.getElementById('my-dialog').showModal()">
        Show modal dialog
    </button>

    <dialog id="my-dialog" @onclose="OnClose" @oncancel="OnCancel">
        <p>Hi there!</p>

        <form method="dialog">
            <button>Close</button>
        </form>
    </dialog>
</div>

@code {
    private string? message;

    private void OnClose(EventArgs e) => message += "onclose, ";

    private void OnCancel(EventArgs e) => message += "oncancel, ";
}

This is the result of the code above.

A button to show the modal dialog;

The Dialog Box with Hi there!

And the “Close” button.

Tip. Mastering a language or technology starts better when we play as kids with the “toys”, so I recommend that any students spend time creating and building pieces of software to understand the concepts and the limits of the tools deeply.

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