90040 - The play function doesn't work.

Status: VERIFIED DUPLICATE of bug 62288

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Thomas Guyot]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.2) Gecko/20010628
BuildID:    2001062815

This page contains a function to play x number of satellite image (usually taken
with one hour interval). When you press the Play button it shows the next image
in the range and stop. It worked well under Netscape 4.77

Reproducible: Always
Steps to Reproduce:
1. Load the page :p
2. Under the satellite image check the radio button labelled "Display the last 6
images" (Or more, like you wish) This will preload all images into the browser
cache. Also, the "Time Frame" range should be automaticaly set from the first
image preloaded to the last one available.
3. Press the "Play" button on top.

Actual Results:  It show the next image and hang.

Expected Results:  Display all images in the "Time Frame" range with an
aproximate pause of 200 ms between each image. When it reach the last image it
pause for about two seconds and start over.

Comment 1

[Asko Tontti]

Seeing with PC Linux 2001070806.

Comment 2

[Phil Schwartau]

OK, the main JavaScript function here is called animate(). 
When you hit the play button, this function sets the SRC attribute
of the IMG to the first weather photo in a sequence of photos. 

Then the onLoad handler of the <IMG> is supposed to call animate(), 
which then loads the next weather photo into the SRC attribute of the <IMG>:


<IMG NAME='animation'      
     SRC='/satellite/data//goes_ecan_visible_m_2001@07@09_20h45m.jpg'           
     ALT='[Animation]' setTimeout('animate()', delay)">



This works in NN4.7, but is not working in Mozilla. The animate() function 
does not seem to be called reliably from the onLoad handler of the <IMG>.

I will attach an HTML file with debugging alerts to show this -

Comment 3

[Phil Schwartau]

Attachment: HTML with debugging alerts added

Comment 4

[Phil Schwartau]

Try the HTML with debugging alerts in NN4.7 and then in Mozilla.
You will see completely different behavior, as the onLoad handler
does not seem to call animate() recursively in Mozilla as in NN4.7.

In NN4.7 you'll need both hands to stop this: keep your left hand
on the "Enter" key to dismiss all the alerts, and at the same time,
click the "Stop" button on the web page to stop all this...

In Mozilla it's not a problem, since the recursion doesn't occur.

Comment 5

[Phil Schwartau]

OS : Win --> All. Reassigning to Event Handling.
cc'ing jst in case he already knows about this issue ...

Comment 6

[Asko Tontti]

Okay, this might be dup of bug 62288 (No onload events after first load of image).

Comment 7

[Phil Schwartau]

Asko is correct: here is the description of bug 62288:

> It seems that none of Mozilla 0.6, nor M18, nor Netscape 6.0, report an 
> onLoad event for the loading of an Image object, nor for subsequent 
> reassignments of the src property of an image that's defined as part of a 
> web page's HTML.  This differs from the behavior of NS3, NS4, IE4, and IE5.

That's exactly what's going wrong here -


NOTE: I inadvertently chopped off part of the <IMG> when I pasted it above.
      Here it is in its entirety, with the onLoad handler visible:

<IMG NAME='animation' 
     SRC='/satellite/data//goes_ecan_visible_m_2001@07@09_20h45m.jpg' 
     ALT='[Animation]' 
     onload="setTimeout('animate()', delay)">

Comment 8

[Phil Schwartau]

*** This bug has been marked as a duplicate of 62288 ***

Comment 9

[Madhur Bhatia]

verified dup