Hi again,
Here is some beta code I've put together that loads a script after
page load. It has these features :
- cross-domain
- Has a callback (onload) parameter
- Tested on FF2, Safari2 & Opera 9.10 (should also work on IE5+)
It could have many uses, including parsing the external scripts in an
ajax.updater for instance.
Current issues:
- there is an iframe hack for the callback with safari, hence 2
queries are sent out.
- opera appears to load the file synchronously
Any thoughts/help/patches/ideas on that code?
//used to insert a script after page load
var Prototype.insertScript = function(url,callback) {
var script = document.createElement('script');
script.type = 'text/javascript';
script.charset="utf-8";
script.defer=true;
var stateChangedCallback = function() {
if (script.readyState && script.readyState != 'loaded'
&&
script.readyState != 'complete')
return;
script.onreadystatechange = script.onload = null;
if (callback) callback();
$(script).remove();
};
script.onload = script.onreadystatechange =
stateChangedCallback;
script.src=url;
//Opera 9.10 appears to load the script synchronously. execution
could hang here a while.
document.getElementsByTagName('head').item(0).appendChild(script);
//safari iframe hack.
// warning, it has one main issue, the request will be issued
two
times.
// should only be used for static files.
if (Prototype.Browser.WebKit && callback) {
var iframe = document.createElement('iframe');
iframe.style.width="0px";
iframe.style.height="0px";
iframe.setAttribute("src",url);
document.getElementsByTagName('body').item(0).appendChild(iframe);
iframe.onload = function() {
stateChangedCallback();
$(iframe).remove();
}
}
}
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