Issues arising from using AJAX with ASP.Net and encountering problems with JavaScript not functioning properly during

I have a scenario where I am using ASP.Net to redirect a page to a download page with the help of AJAX. The redirection is successful, the file is downloaded, and the calling page is displayed as expected. However, I need to execute some JavaScript code after the file has been downloaded in order to remove the waiting screen.

Currently, I am initiating the redirect first followed by the JavaScript call to unblock the user interface. To block the UI initially, I employ onclientclick='block()';

  Response.Redirect("ExportFile.aspx", false);
 ScriptManager.RegisterClientScriptBlock((this), this.GetType(), "alertAction", "alert('');unblock();", true);

Unfortunately, the alert doesn't seem to work, indicating that the JavaScript is not being triggered at all. I attempted placing the code on the file download page but that did not yield the desired outcome either. I even experimented with using body onpageunload, but that event never seems to be fired.

Could someone guide me on how to successfully redirect to a file download page and then invoke JavaScript to unblock the UI?

javascriptc#asp.netajaxjquery-ui

Answer №1

After the response.redirect is triggered, all subsequent code execution is halted. One approach to handle this situation is by writing your redirect logic in JavaScript and embedding it within a RegisterClientScriptBlock function call. It's important to ensure that the unblock action occurs before the window.location redirection.

ScriptManager.RegisterClientScriptBlock((this), this.GetType(), "alertAction", "unblock(); window.location.assign('yourPage.aspx');", true);

Answer №2

boruchsiper is indeed correct! After redirecting the user to a new page, it's important to ensure that any necessary actions are carried out on that specific page. To do this, you can include the following line of code in the Load() function of the new page's code-behind:

ScriptManager.RegisterClientScriptBlock((this), this.GetType(), "alertAction", "alert('');unblock();", true);

If needed, you can also pass along query string parameters in the redirect URL to instruct the new page to perform certain actions.

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