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CHOI

alert does not work when beforeunload in IE(after the RS5)

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Hello

This issue occurred In Internet explorer 11 after the RS5(REDSTONE 5 / OS version 1809 / xx.xxx.17763.x ) update. 

I would like to know more about this issue.

The following Javascript works when RS4(IE11) or lower, But does not work from RS5(IE11).

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

(This is similar to pseudo code.)

window.onbeforeunload = X();

function X() {

/// to-do

.....

save(); // save logic when this pop-up window beforeunload. // not work from RS5(it works when RS4 or lower version)

alert('are u sure ?'); <<<<< // this alert does not work from RS5(it works when RS4 or lower version)

....

return;

}

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

So I changed the JavaScript as follows.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

(This is similar to pseudo code.)

window.addEventListener("beforeunload", X);

function X(e){

e.returnValue = 'are u sure?'; // work in All of IE version

//to-do 

save(); // work in All of IE version

console.log('are u sure?'); // work in All of IE version

alert('are u sure?'); // work in RS4 or lower  version but it still does not work in RS5

}

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

As a result, JavaScript works except alert.

I want to know that whether this is the best method and whether there is an official document on this situation.

If you know this situation, please reply.

Thank you.

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