refresh of aspx page

I have a web aspx page that has a button that once it is clicked, it updates a table and response.redirects to a pdf file.

When I click on the back arrow of the in the pdf, the field that is supposed to be displayed is not displayed until I manually hit the F5 key.

In another words, the 'Complete' label is not visible when you go into the page, but needs to be visible when I return from the pdf.
sjs091654Asked:
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GauthierCommented:
That behavior is browser dependent, but the back button on recent browser use the cached rendering and doesn't refresh or execute code.
To prevent that just add an onunload event
0
sjs091654Author Commented:
How do I do that?   I also noticed that the 'Complete' label will appear if I don't redirect to another page on clicking the button
0
GauthierCommented:
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers.onunload
Just add an empty anonymous function as the listener.
The mere presence of the event listener is enough to disable the caching when using back.

window.onunload = function (){};
or
window.addEventListener ("unload", function (){});
or
$( window ).unload(function() {};
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