Leaving page event

Question

Hi all, I'm currently trying to create a page with the user will be able to create an order form. I would like to add in some codes to generate a message box when the user navigates away from that page. I tried using both "Protected Override Void onUnLoad(EventArgs e)" as well as "void Page_Unload" but both methods seems to execute right after Page_Load, which resulted in the displaying of the message box the moment the page loads. Appreciate if anyone can advise me on this

Yi Rong Tan · Answer

I actually wanted the page to display a messagebox to show a warning message if the user leaves the order page without submitting the order.

Bhushan Gawale · Answer

By default the event is fired when the page is unloaded from the browser and hence the event will be fired even when you refresh the same page and that's fine, is there any specific reason you are trying to achieve same only for redirects? In that case - you will need to take some extra efforts and need to add logic in the event which will differentiate refresh and redirect calls, something like this http://www.anandkanatt.com/how-do-i-detect-browser-window-closed-refreshed/

Yi Rong Tan · Answer

Hi Bhushan, the method you advised displayed the messagebox the moment the page was loaded. May I know if it is possible to display the messagebox only when the user want to LEAVE the page?

Bhushan Gawale · Answer

This can be done in better way on the client than handling the event on server. Try using onbeforeunload event http://www.w3schools.com/tags/ev_onbeforeunload.asp