发出警报消息时的呼叫功能

Question

I want to know which Dom event is fired when alert message is called. I want to call start_tracking method when alert message is called. I am able to call methods on page resize but how can i know which method is called when the alert message is fired.

win.addEventListener("click", function(event) {
      start_tracking ();
});

Click event is working when i am clicking anywhere on the page but when i click the alert message content then it does not fire the click listener. Nothing seems to be fired on the alert() function.

Answer 1

You could also override the native alert function...

 function testAlert(){ alert('Test Alert Warning... You clicked a button.'); } window.oldAlert = window.alert; window.alert = function alert(msg){ console.log(arguments.callee.caller.name + ' is the name of the calling function.'); // calling function... oldAlert(msg); oldAlert(arguments.callee.caller.name + ' is the name of the calling function.'); } 

 <button onclick="testAlert();">Warn!</button> 

This will give you the calling functions name... Hope this helps.

Answer 2

It is not possible to capture any alert() function events. I don't know why you would want to do that, but I would create another function instead called warn() .

 function warn(warning) { alert(warning); capturedAlert(); } function capturedAlert() { alert('An alert was called.'); } 

 <button onclick="warn('This is a warning!')">Warn!</button> 

This way, every time warn() is called, you can alert() the user, AND call another function.