CODEWITHSUNDEEP
javascripthtmleventsonload
Robin Rodricks
Robin Rodricks

Reputation: 114126

Attach a body onload event with JS

How do I attach a body onload event with JS in a cross browser way? As simple as this?

  document.body.onload = function(){
      alert("LOADED!");
  }

Upvotes: 40

Views: 132794

Answers (6)

jamesse
jamesse

Reputation: 25

Why not using jQuery?

$(document).ready(function(){}))

As far as I know, this is the perfect solution.

Upvotes: -4

Aamir Afridi
Aamir Afridi

Reputation: 6411

Cross browser window.load event

function load(){}

window[ addEventListener ? 'addEventListener' : 'attachEvent' ]( addEventListener ? 'load' : 'onload', load )

Upvotes: 15

Marcello Bastea-Forte
Marcello Bastea-Forte

Reputation: 1167

document.body.onload is a cross-browser, but a legacy mechanism that only allows a single callback (you cannot assign multiple functions to it).

The closest "standard" alternative, addEventListener is not supported by Internet Explorer (it uses attachEvent), so you will likely want to use a library (jQuery, MooTools, prototype.js, etc.) to abstract the cross-browser ugliness for you.

Upvotes: 9

hajamie
hajamie

Reputation: 2938

jcalfee314's idea worked for me - I had a window.onload = onLoad which meant that the functions in <body onload="..."> were not being called (which I don't have control over).

This fixed it:

oldOnLoad = window.onload
window.onload = onLoad;

function onLoad()
{
oldOnLoad();
...
}

Edit: Firefox didn't like oldOnLoad = document.body.onload;, so replaced with oldOnLoad = window.onload.

Upvotes: 2

gnarf
gnarf

Reputation: 106412

This takes advantage of DOMContentLoaded - which fires before onload - but allows you to stick in all your unobtrusiveness...

window.onload - Dean Edwards - The blog post talks more about it - and here is the complete code copied from the comments of that same blog.

// Dean Edwards/Matthias Miller/John Resig

function init() {
  // quit if this function has already been called
  if (arguments.callee.done) return;

  // flag this function so we don't do the same thing twice
  arguments.callee.done = true;

  // kill the timer
  if (_timer) clearInterval(_timer);

  // do stuff
};

/* for Mozilla/Opera9 */
if (document.addEventListener) {
  document.addEventListener("DOMContentLoaded", init, false);
}

/* for Internet Explorer */
/*@cc_on @*/
/*@if (@_win32)
  document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
  var script = document.getElementById("__ie_onload");
  script.onreadystatechange = function() {
    if (this.readyState == "complete") {
      init(); // call the onload handler
    }
  };
/*@end @*/

/* for Safari */
if (/WebKit/i.test(navigator.userAgent)) { // sniff
  var _timer = setInterval(function() {
    if (/loaded|complete/.test(document.readyState)) {
      init(); // call the onload handler
    }
  }, 10);
}

/* for other browsers */
window.onload = init;

Upvotes: 22

Andreas Grech
Andreas Grech

Reputation: 108050

Why not use window's own onload event ? 

window.onload = function () {
      alert("LOADED!");
}

If I'm not mistaken, that is compatible across all browsers.

Upvotes: 25

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