How to Call JavaScript Functions from ASP.NET CodeBehind and Vice Versa?

Intermodulation of ASP.NET and JavaScript functions

ASP.NET allows front-end and back-end codes (CodeBehind and JavaScript) to call each other's functions to achieve dynamic interaction.

Calling JavaScript from CodeBehind

To call JavaScript functions in CodeBehind, you can use ClientScriptManager. This manager provides methods to register and run JavaScript.

For example, to call a JavaScript function named MyFunction when the page loads, you would use the following code:

<code class="language-csharp">Page.ClientScript.RegisterStartupScript(this.GetType(), "CallMyFunction", "MyFunction()", true);</code>

This code registers the MyFunction call as a startup script to be executed when the page loads.

Call CodeBehind from JavaScript

To call CodeBehind from JavaScript, you can use the PageMethods class. This class provides a way to expose server-side methods to JavaScript.

For example, to call the CodeBehind method named HelloWorld, you can use the following JavaScript code:

<code class="language-javascript">PageMethods.HelloWorld(function(result) {
  // 处理结果
});</code>

This code calls the HelloWorld method, passing a callback function that will be called after the server-side method completes.

Application scenario examples

Client-side verification is a common scenario that requires CodeBehind and JavaScript to call each other:

• CodeBehind: Register JavaScript verification function as startup script.
• JavaScript: Use the registered function to verify the form data before submitting it to the server.
• CodeBehind: Processes form data and responds based on JavaScript validation results.

The above is the detailed content of How to Call JavaScript Functions from ASP.NET CodeBehind and Vice Versa?. For more information, please follow other related articles on the PHP Chinese website!