Calling the __doPostBack() Method in Vanilla JavaScript

Using __doPostBack() to trigger asynchronous postbacks is a fundamental aspect of ASP.NET development. This JavaScript function plays a crucial role in facilitating seamless user interactions with web applications.

Function Syntax and Usage

The __doPostBack() function takes two arguments:

• EventTarget: Specifies the ID of the HTML element (e.g., button) that initiated the postback.
• EventArgument: An optional parameter that can be used to pass additional information along with the postback.

Implementation Example

Consider a button with an ID of "btnSave" that you want to use to trigger an asynchronous postback. You can achieve this using vanilla JavaScript as follows:

In the code behind, you can retrieve the passed parameter and perform the desired actions:

public void Page_Load(object sender, EventArgs e) {
  string parameter = Request["__EVENTARGUMENT"]; // parameter
  // Request["__EVENTTARGET"]; // btnSave
}

Conclusion

By understanding the syntax and implementation of __doPostBack(), you can leverage its functionality to create interactive web applications in ASP.NET using vanilla JavaScript. Experiment with this powerful method to enhance the responsiveness and user experience of your applications.