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Hope this made sense and helped you understand these two unique events, their purpose and their differences. (like, seriously, it was literally invented for this case) so make sure to use that if you want to know for sure your data is sent without expecting a response. In order to successfully do so, sendBeacon() was invented. Use sendBeacon() in case you must send data before unloading - sometimes it makes sense for a website to want to send some POST data when the page is about to unload.No long actions inside these listeners - although practically you can synchronously do what ever you want inside the listeners, it is bad practice! Avoid long actions in order to make sure you don’t prevent the user from smooth unloading of your website.
#Epson adjustment program xp 320 + gratis code#
Understand your case first - if the code you attempt to debug is, for some reason, session-based, closing the session (by using the trick above and closing the tab) each time might create a different flow from what you actually try to research - take that into consideration when debugging!. 
It might work on other browsers though - again, never even checked.
Google Chrome Browser - I haven’t checked whether this trick works on other browsers than Chrome, mostly because I don’t see a reason to debug javascript code in any other browser (yeah, I said it). 
It is easier to repeatedly do so while working at the same window, which would only be possible if the closing tab is not the only tab in the window.
Keep an extra tab open in your Chrome window - once you use the trick to debug listeners, although you’d be able to debug them, you will not be able to prevent the tab from shutting down. So what’s wrong with my breakpoint? or placing a debugger command? Why don’t these work? I mean, any javascript code that is intended to execute under this event executes perfectly fine - whether it’s console.log(), tItem() or any other standard action. So I set a breakpoint where the code that is supposed to be fired by the unload event is, and reloaded the page to allow my Google Chrome Browser stop at this breakpoint of mine letting me debug it.įor those of you who have enough javascript experience, the following will not shock you at all: the browser ignored my breakpoint completely and reloaded the page normally. This was where I had to debug to be able to tell whether I found something interesting here or not. There is a specific one that I have reasons to believe that might be vulnerable to a serious XSS exploitation.Īt some point in the process, I realized that the part that might be vulnerable to XSS is executed by an unload event listener that was registered by some javascript code in the website. To “The Trick To Successfully Debug unload/ beforeunload EventĪs I often do, I was looking for potential vulnerabilities in well known websites and web applications. #Epson adjustment program xp 320 + gratis how to#
Tl dr - if you’re only here for the trick of how to set a breakpoint andĪctually debug ** unload and beforeunload event listeners, go straight
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