116535 - Animated GIFs should trigger the onload event on every loop of the animation

Status: RESOLVED WONTFIX

(Core :: DOM: Events, defect, P4)

Description

[Ilya Konstantinov]

According to the JavaScript 1.3 reference (as found on developer.netscape.com), IMG objects which display an animation (e.g. an animated GIF image) should trigger their onload event not only when the image finishes loading but upon displaying of each frame of the animation. Mozilla currently doesn't do it, while Netscape 4 does.

Note: MSDN seems to mention nothing about this onload functionality, so you might as well choose to omit this feature for sake of IE compatibility.

Comment 1

[basic]

From JS 1.3 client reference
"If you specify an onLoad event handler for an Image object that displays a
looping GIF animation (multi-image GIF), each loop of the animation triggers the
onLoad event, and the event handler executes once for each loop."

it is "each loop" not "each frame"!!

Changing summary from:
Animated GIFs should trigger the onload event on every frame of the animation
To
Animated GIFs should trigger the onload event on every loop of the animation

Comment 2

[Judson Valeski]

pav, do we capture img animation loop state that we then fire some event off of?

Comment 3

[Stuart Parmenter]

"ugh"  this would suck and I expect break some stuff.

Comment 4

[Vladimir Ermakov]

Attachment: testcase

Comment 5

[Ilya Konstantinov]

Stuart, would it be wise to fix it or to let it go WONTFIX?

Comment 6

[Stuart Parmenter]

I'm tempted to say WONTFIX since I haven't seen anyone else actually complain about this since it was initially filed.

Comment 7

[Ilya Konstantinov]

Ok.