Exploring the __dopostback('ctl00$launchbar$logoff_linkbutton','') Function: Boosting Your Web Development Skills

In this guide, we will be exploring the __dopostback('ctl00$launchbar$logoff_linkbutton','') function, which is commonly used in web development to trigger server-side events from client-side code. This function is usually auto-generated by ASP.NET Web Forms when a control requires a postback to the server. By the end of this guide, you will have a better understanding of how this function works and how to effectively use it in your projects.

Table of Contents

  1. Understanding the __dopostback function
  2. Step-by-step guide to using __dopostback
  3. FAQ
  4. Related Links

Understanding the __dopostback function

The __dopostback function is a JavaScript function generated by ASP.NET Web Forms to trigger server-side events from client-side code. It is used to initiate a postback to the server, passing in the ID of the control that caused the postback and any additional arguments required.

The function is called with the following syntax:

__dopostback(eventTarget, eventArgument);
  • eventTarget: A string representing the ID of the control that caused the postback.
  • eventArgument: A string representing any additional arguments required for the postback.

In our example, __dopostback('ctl00$launchbar$logoff_linkbutton',''), the eventTarget is 'ctl00$launchbar$logoff_linkbutton' and the eventArgument is an empty string.

The eventTarget and eventArgument values are then processed server-side to trigger the appropriate event handlers and perform the necessary actions.

Learn more about the __dopostback function

Step-by-step Guide to Using __dopostback

Create an ASP.NET Web Forms project: Create a new project in Visual Studio, selecting the "ASP.NET Web Forms Application" template.

Add a control that requires postback: Add a control to the page that requires a postback to the server, such as a Button or LinkButton. For example:

<asp:LinkButton ID="logoff_linkbutton" runat="server" OnClick="logoff_linkbutton_Click">Log Off</asp:LinkButton>
  1. Implement the server-side event handler: Implement the server-side event handler for the control in the code-behind file. For example:
protected void logoff_linkbutton_Click(object sender, EventArgs e)
    // Perform logoff actions here
  1. Add client-side code: Add client-side code to call the __dopostback function when needed. For example:
function logoff() {
    __dopostback('ctl00$launchbar$logoff_linkbutton', '');
  1. Trigger the client-side code: Add an HTML element to trigger the client-side code. For example:
<button onclick="logoff()">Log Off</button>
  1. Test the functionality: Run the project and test the functionality by clicking the "Log Off" button. The __dopostback function should be called, initiating a postback to the server and triggering the server-side event handler.


What is a postback?

A postback is a process in which a web page sends data back to the server to perform some action and then reloads the page with the updated information.

Why use the __dopostback function?

The __dopostback function allows you to trigger server-side events from client-side code, giving you more control over the flow of your application and enabling you to create more interactive and responsive user interfaces.

Can I call the __dopostback function directly?

Yes, you can call the __dopostback function directly from your client-side code, passing in the appropriate eventTarget and eventArgument values.

Do I need to include any additional JavaScript libraries?

No, the __dopostback function is automatically generated by ASP.NET Web Forms, and no additional libraries are required.

Can I use the __dopostback function in other web development frameworks?

The __dopostback function is specific to ASP.NET Web Forms. However, similar functionality can be achieved in other web development frameworks using AJAX or other client-server communication techniques.

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