366403 - onload event only happens on browser back if there is an onunload handler

Status: RESOLVED INVALID

(Core :: DOM: Core & HTML, defect)

Description

[William Bardwell]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.9) Gecko/20061206 Firefox/1.5.0.9
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a2pre) Gecko/20070108 Minefield/3.0a2pre

If I have a document with JavaScript like the following:
window.onload =
function()
{
    alert("calling on-load");
};

If I browse that page, the code fires, if I then browse to a new page, and then hit browser back, I find that that code only happens if I add code to set an onunload handler (even an empty one.)

Reproducible: Always

Steps to Reproduce:
1. See above happens in 2.0, Gran Paradiso and last nights minefield
2.
3.
Actual Results:  
See above, onload only happens on initial load, and not on browser back to a page, unless you also have an onunload handler.

Expected Results:  
window.onload =
function()
{
    alert("calling on-load");
};

Should be enough to be called on initial load and browser back.  But instead I need to add the below, which should have no effect.

window.onunload =
function()
{
};

Comment 1

[:Gavin Sharp [email: [e-mail]]]

This is invalid. You should use the pagehide/pageshow event if you want your handlers to be fired on back/forward navigation. See http://developer.mozilla.org/en/docs/Using_Firefox_1.5_caching .