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A simple guide to implementing dynamic visibility in Blazor applications using conditional rendering based on user input.
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This video is based on the question https://stackoverflow.com/q/63728870/ asked by the user 'Bryce Steuer' ( https://stackoverflow.com/u/13860841/ ) and on the answer https://stackoverflow.com/a/63729573/ provided by the user 'Umair' ( https://stackoverflow.com/u/1158845/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Hide and Show Sections in Blazor with a Button Click

Creating dynamic web pages is a core part of modern web development. This is particularly true when working with frameworks like Blazor that allow for interactive web applications. One common requirement you might have is to show or hide sections of your page based on user interaction—specifically, when a user selects an option like "Yes" or "No."

The Challenge

You may find yourself needing to conditionally display a section based on radio button selections. For example, you want to show a form only when the user indicates they have business sales, custom work, or services above a certain threshold. The default state should hide the form, only displaying it if the user selects "Yes."

Here’s an outline of the original HTML structure used for this feature:

A question to prompt user input (e.g., "Do you have business sales...?")

Two radio button options: "Yes" and "No."

A form that should only appear if "Yes" is selected.

The challenge arises when trying to determine how to implement this conditional visibility correctly within Blazor.

The Solution

Step 1: Use a Boolean Variable

To control the visibility of the section, you'll introduce a boolean variable. This variable determines whether the section should be displayed based on user input.

Step 2: Update Your Razor Page

Here’s an example of how you can structure your Blazor component using Razor syntax:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Code Behind

In your code block (or code section), you will define the variable and a method to change its value based on user interaction:

[[See Video to Reveal this Text or Code Snippet]]

How It Works

When the user selects the "Yes" radio button, the OnUpdated method is invoked. This method sets the ShowSection variable to true, which causes the section wrapped in the @ if (ShowSection) to be displayed. Conversely, if the "No" option is selected, ShowSection remains false, hiding the form.

Conclusion

Implementing conditional visibility in Blazor using a boolean variable is straightforward. By listening for changes on the radio buttons and updating your component’s state accordingly, you create a seamless user experience that enhances interaction with your web application.

Now that you understand how to hide and show sections dynamically in Blazor, you can apply similar techniques to various other interactive elements in your applications, improving both usability and engagement. Enjoy building dynamic interfaces!