Hi, I'm trying to set up a general window event listener, specifically, the 'before unload' event from the page lifecycle API.
Question: Is there any way to set general listeners in a retool dashboard -- setting JS that isn't triggered by a UI action or on pageLoad.
My use case is just generating a warning modal if the user exits their tab or browser.
Thank you!
P.S. Hi Victoria / best TA ever!!! 
Hello mysterious @alw93!
We don't have access to window event handlers, like onbeforeunload, since all JS in Retool runs in a sandbox. 😓
Hi @victoria
is there a way with retool to prompt a modal if there is any unsaved change when leaving the app. (say the app has a form that needs inputs and saving)
Hi Philippe! If there was an event to watch for app closing, then we could trigger a modal to open based on 1. this ideal, but non-existent app closing event and 2. !textInput1.value (or some way to see if a form input is empty or not).
If you throw your form into a modal, you could watch for the modal closing and check if any components are empty. If empty, you could trigger the same modal to open (or trigger a notification to show, or open a new modal) with something like this event handler:
Would something like this work for you?
Hello @victoria, Still can't use addEventListener?
we tried to use resize event but apparently doesn't work.
thank you!
EDIT: i think i found the posible solution i created a question but i added a comment with the posible solution, let me know if i can use the events 
Hey @borisHuezo! That's awesome, so glad you found a workaround since this isn't supported in Retool just yet.
ty!