META-INF.resources.omnifaces.deferredscript.unminified.js Maven / Gradle / Ivy
/*
* Copyright 2014 OmniFaces.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
var OmniFaces = OmniFaces || {};
/**
* Deferred script loader.
*
* @author Bauke Scholtz
* @see org.omnifaces.component.script.DeferredScript
* @since 1.8
*/
OmniFaces.DeferredScript = (function() {
var deferredScript = {};
var deferredScripts = [];
deferredScript.add = function(url, begin, success, error) {
deferredScripts.push({ url: url, begin: begin, success: success, error: error });
if (deferredScripts.length == 1) {
OmniFaces.Util.addOnloadListener(function() {
loadDeferredScript(0);
});
}
}
function loadDeferredScript(index) {
if (index < 0 || index >= deferredScripts.length) {
return; // No such script.
}
var deferredScript = deferredScripts[index];
var script = document.createElement("script");
var head = document.head || document.documentElement;
script.async = true;
script.src = deferredScript.url;
script.onerror = function() {
if (deferredScript.error) {
deferredScript.error();
}
};
script.onload = script.onreadystatechange = function(_, abort) {
if (abort || !script.readyState || /loaded|complete/.test(script.readyState)) {
script.onload = script.onreadystatechange = null; // IE memory leak fix.
if (abort) {
script.onerror();
}
else if (deferredScript.success) {
deferredScript.success();
}
script = null;
loadDeferredScript(index + 1); // Load next deferred script (regardless of current state).
}
};
if (deferredScript.begin) {
deferredScript.begin();
}
head.insertBefore(script, null); // IE6 has trouble with appendChild.
}
return deferredScript;
})();