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util.js: fix dynamic script load on IE 9 (again). 

Use a mechanism described here to serialize the execution of scripts
under IE: http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
Basically, we set the src attribute but do not append the script to
the body/head until after readyState is "loaded". Unfortunately, Opera
uses readyState but in a different way (always "loaded" for both load
and execution).

This is related to (and hopefully fixes) these issues:
https://github.com/kanaka/noVNC/issues/194,
https://github.com/kanaka/noVNC/issues/205,
https://github.com/kanaka/noVNC/issues/208.
This commit is contained in:
Joel Martin 2012-10-23 15:54:08 -05:00
parent 5514d29950
commit 73ee4fa7cc
1 changed files with 33 additions and 29 deletions
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62
include/util.js
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@ -217,38 +217,30 @@ Util.conf_defaults = function(cfg, api, defaults, arr) {
Util.get_include_uri = function() {
return (typeof INCLUDE_URI !== "undefined") ? INCLUDE_URI : "include/";
}
Util._loading_scripts = [];
Util._pending_scripts = [];
Util.load_script = function(file, onload) {
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = Util.get_include_uri() + file;
// In order script execution for webkit and firefox
// https://developer.mozilla.org/en-US/docs/HTML/Element/script
script.async = false;
if (Util.Engine.trident) {
// In order script execution for IE 9
// http://ui.cognifide.com/slides/async-js/template/#26
script.defer = true;
}
//console.log("loading script: " + Util.get_include_uri() + files[f]);
head.appendChild(script);
if (typeof onload !== "undefined") {
script.onload = script.onreadystatechange = onload;
}
return script;
};
Util.load_scripts = function(files) {
var head = document.getElementsByTagName('head')[0],
ps = Util._pending_scripts;
var head = document.getElementsByTagName('head')[0], script,
ls = Util._loading_scripts, ps = Util._pending_scripts;
for (var f=0; f<files.length; f++) {
var script = Util.load_script(files[f], function (e) {
if (!this.readyState ||
this.readyState == 'complete' ||
this.readyState == 'loaded') {
this.onload = this.onreadystatechange = null;
script = document.createElement('script');
script.type = 'text/javascript';
script.src = Util.get_include_uri() + files[f];
//console.log("loading script: " + script.src);
script.onload = script.onreadystatechange = function (e) {
while (ls.length > 0 && (ls[0].readyState === 'loaded' ||
ls[0].readyState === 'complete')) {
// For IE, append the script to trigger execution
var s = ls.shift();
//console.log("loaded script: " + s.src);
head.appendChild(s);
}
if (!this.readyState ||
(Util.Engine.presto && this.readyState === 'loaded') ||
this.readyState === 'complete') {
if (ps.indexOf(this) >= 0) {
//console.log("loaded script: " + this.src);
this.onload = this.onreadystatechange = null;
//console.log("completed script: " + this.src);
ps.splice(ps.indexOf(this), 1);
}
// Call window.onscriptsload after last script loads
@ -256,7 +248,19 @@ Util.load_scripts = function(files) {
window.onscriptsload();
}
}
});
};
// In-order script execution tricks
if (Util.Engine.trident) {
// For IE wait until readyState is 'loaded' before
// appending it which will trigger execution
// http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
ls.push(script);
} else {
// For webkit and firefox set async=false and append now
// https://developer.mozilla.org/en-US/docs/HTML/Element/script
script.async = false;
head.appendChild(script);
}
ps.push(script);
}
}