Ajax undoes any modifications enacted by JavaScript

When using ajax, I trigger an OnTextChangedEvent. Before this event occurs, there is a Javascript function that validates the input field and displays text based on its validity. However, once the Ajax is executed, it resets any changes made by the Javascript in the following sequence:

Javascript triggers!

Text changes are displayed

Ajax triggers!

Text changes are reset

The Ajax partial autopostback is enclosed within an update panel. Does anyone have ideas on how to prevent the reset of changes made by the Javascript? Any insights would be appreciated. I will update with code as I can throughout the day. Thank you in advance.

c#javascriptasp.netajax

Answer №1

Modifications to the DOM model do not get sent to the server. When the ajax request is triggered, any changes made by JavaScript in the DOM will be overwritten.

The solution is to send the validation texts to the server and then add them back through an ajax call.

Answer №2

When an update occurs, the UpdatePanel completely refreshes its contents. This results in any previously subscribed events being lost due to the new elements present in the updated panel.
For more details, check out the complete answer here

To address this issue, include the following script within your Page or MasterPage:

<script type="text/javascript">
  Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);

  function EndRequestHandler(sender, args)
  {
    Validate(); //method that checks input fields
  }   
</script>

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