CODEWITHSUNDEEP
javascript
Mario Stoilov
Mario Stoilov

Reputation: 3447

onbeforeunload not working at all

I have this code:

(function() {
      window.onbeforeunload = function () {
          alert("hi")
          console.log("unloading");
      };
})();

I also have this code:

window.addEventListener("beforeunload", function() {
   alert("hi")
   console.log("unloading")
});

None of them seem to work. All I want to do is log when the user tries to leave the page, but this isn't happening (latest Chrome, latest Firefox, Edge....), can anybody shed some light on why it's not working?

Upvotes: 3

Views: 7616

Answers (4)

Jesper
Jesper

Reputation: 316

You have to return from the onbeforeunload:

(function() {
  window.onbeforeunload = function () {
      alert("hi")
      console.log("unloading");
      return null;
      };
    })();

Upvotes: 0

JYoThI
JYoThI

Reputation: 12085

function myFunction() {
    return "Write something clever here...";
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<body onbeforeunload="return myFunction()">
  
  </body>

Upvotes: 0

Mister M
Mister M

Reputation: 1669

Since 25 May 2011, the HTML5 specification states that calls to window.alert(), window.confirm(), and window.prompt() methods may be ignored during this event. See the HTML5 specification for more details. Note also that various mobile browsers ignore the result of the event (that is, they do not ask the user for confirmation). Firefox has a hidden preference in about:config to do the same. In essence this means the user always confirms that the document may be unloaded.

Source

Also, use return statement to prompt user before leaving

window.addEventListener("beforeunload", function() {
   return "hi";
});

Upvotes: 3

Tilak Madichetti
Tilak Madichetti

Reputation: 4346

Do it this way:

  window.onbeforeunload = function (e) {
          console.log("unloading");
          return "Hi";
      };

That will alert Hi when page unloads and also prints unloading in console

Upvotes: 0

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