[Webkit-unassigned] [Bug 12131] New: Onload not working for loading scripts dynamically.

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=12131

           Summary: Onload not working for loading scripts dynamically.
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh
               URL: http://www.jsrepository.com
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jnicoll at seemysites.net


In developing AJAX scripts, it is important to know if or when a javascript
file has loaded.  Unfortunately there is no way to tell in Javascript if a
specific file has loaded in Safari.  In Opera and Firefox one can use the
"onload" handler and in Internet Explorer one can use the "onreadystatechange"
handler to call a function that can serve this purpose.  Both of these methods
fail in Safari however.

Here are two different ways to attach events (cross browser, generally), both
of which fail in Safari: 

---------------------
First Way
---------------------
script_object = document.createElement('script');
sEventType = 'load';
fnHandler = listener;
script_object.src = 'some_file.js';
if (script_object.addEventListener) {
  script_object.addEventListener('load', listener, false);
} else if (script_object.attachEvent) {
  script_object.attachEvent('onload', listener);
} else {
  script_object['onload'] = fnHandler;
}

document.getElementsByTagName("head")[0].appendChild(script_object);

---------------------
Second Way
---------------------
script_object = document.createElement('script');
script_object.onreadystatechange = listener;
script_object.onload = listener;
document.getElementsByTagName("head")[0].appendChild(script_object);


I expect Safari to call the listener function (named listener in these
examples), but nothing to this effect happens.  This seems to happen in all
instances.  In my search for a work around to this problem, I have also seen
many requests for this type of functionality to be added to CSS files as well
as there are times that JavaScript methods will try to modify non-existent CSS
properties and cause errors.  This would give JavaScript coders a way to check
to see if the required files have been loaded.


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