Asp.net update label client side

If you inspect the DOM tree in FireBug, you will notice that the labels are dimmed to indicate that they are not producing visible content. Click the Update This Panel button, and notice the top UpdatePanel will be updated with the current server time.

In FireBug, choose the Console tab so that you can examine the request. Examine the POST request parameters first:. Now, click on the Update Both Panels button. Then, examining the response, we see a pipe-delimited series of variables set in a string; specifically, we see the top UpdatePanel, UpdatePanel1 , has the entirety of its HTML sent to the browser.

Now, click on the Update Both Panels button and examine the results from the server. As with the previous callback, additional page state is sent.

As we can see, because no special code is utilized to perform an AJAX postback, the AJAX client script library is able to intercept form postbacks without any additional code. Server controls automatically utilize JavaScript so that they do not automatically submit the form - ASP. NET automatically injects code for form validation and state already, primarily achieved by automatic script resource inclusion, the PostBackOptions class, and the ClientScriptManager class.

For instance, consider a CheckBox control; examine the class disassembly in. NET Reflector. To do so, ensure that your System. Web assembly is open, and navigate to the System. CheckBox class, opening the RenderInputTag method. Look for a conditional that checks the AutoPostBack property:. NET event handling script in its onclick attribute.

The interception of the form's submission, then, allows ASP. NET AJAX to be injected into the page nonintrusively, helping to avoid any potential breaking changes that might occur by utilizing a possibly-imprecise string replacement. Furthermore, this enables any custom ASP. User posted Hi, I created a sample page for you. Please refer it. I tested it and it works for me. User posted Hi Ruchira, It seems, on server side, errorMsg Text never changes.

User posted Hi bbxrider, Why are you trying to reset a Label's value? Can users modify it? Text didn't change. Write errorMsg User posted Hi Ruchira, I test the code , the value does change when click the button. But after postback, the value restore. See the code in my last reply. User posted thanks for all the generous replies, I did a test that simulates more of how my app functions see below, and yes in the simulation the label does get changed on client side, but still not getting changed in my app.

IsPostBack Then errorMsg Here we discuss the introduction to ASP. NET UpdatePanel along with programming example. You may also have a look at the following articles to learn more —. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy.

Free Software Development Course. Login details for this Free course will be emailed to you. Copy Code. Add a Solution. Thanks Nov pm.

Where is the code? Top Rated Most Recent. Accept Solution Reject Solution. Its important to know how the Client and Server side code works.

Take a look at example code i created: C. Posted Nov pm Thanks I dont want to use hidden field, because i have more than 10 labels to be updated in client side.. This is how ASP. NET works. Server and client are totally different things. In very simple terms,you have to make server aware of what happened at client side. I updated the solution in order to show you the example code.