forked from extern/egroupware
tracking state of existing script tags and allow to specify multiple callbacks for loading of javascript files
This commit is contained in:
Ralf Becker
parent
7fe9c7f97b
commit
90370bc387
@ -26,53 +26,96 @@ egw.extend('files', egw.MODULE_WND_LOCAL, function(_app, _wnd) {
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* Array which contains all currently bound in javascript and css files.
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*/
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var files = {};
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function addFile(src)
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/**
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* Remove optional timestamp attached directly as first query parameter, eg. /path/name.js?12345678[&other=val]
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*
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* Examples:
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* /path/file.js --> /path/file.js
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* /path/file.js?123456 --> /path/file.js
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* /path/file.php?123456¶m=value --> /path/file.php?param=value
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*
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* @param _src url
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* @return url with timestamp stripped off
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*/
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function removeTS(_src)
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{
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if (src)
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{
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// Remove everything after the "?"
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src = src.split('?').shift();
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files[src] = true;
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}
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return _src.replace(/\?[0-9]+&?/, '?').replace(/\?$/, '');
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}
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/**
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* Gather all already loaded JavaScript and CSS files on document load.
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* Add file to list of loaded files
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*
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* TODO: Currently this can only contain the JS files present in the main
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* window.
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* @param src url of file
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* @param dom optional dom node to trac loading status of javascript files
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*/
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// Iterate over the script tags
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var scripts = _wnd.document.getElementsByTagName('script');
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for (var i = 0; i < scripts.length; i++)
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function addFile(src, dom)
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{
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addFile(scripts[i].getAttribute('src'));
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}
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// Iterate over the link tags
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var links = _wnd.document.getElementsByTagName('link');
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for (var i = 0; i < links.length; i++)
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{
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addFile(links[i].getAttribute('href'));
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}
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function includeJSFile(_jsFile, _callback, _context)
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{
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var alreadyLoaded = false;
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if (typeof files[_jsFile] === 'undefined')
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if (src)
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{
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// Create the script node which contains the new file
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var scriptnode = _wnd.document.createElement('script');
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scriptnode.type = "text/javascript";
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scriptnode.src = _jsFile;
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scriptnode._originalSrc = _jsFile;
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files[removeTS(src)] = dom || true;
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}
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}
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/**
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* Check if a source file is already loaded or loading
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*
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* @param _src url of file (already run throught removeTS!)
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* @return false: not loaded, true: loaded or "loading"
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*/
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function isLoaded(_src)
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{
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switch (typeof files[_src])
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{
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case 'undefined':
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return false;
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case 'boolean':
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return files[_src];
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default:
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return files[_src].readyState == 'complete' || files[_src].readyState == 'loaded';
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}
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return "loading";
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}
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/**
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* object with array of callbacks or contexts by source/url
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*/
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var callbacks = {};
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var contexts = {};
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/**
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* Attach onLoad callback to given js source
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*
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* @param _src url of file (already run throught removeTS!)
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* @param _callback
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* @param _context
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* @return true if callback got attached, false if it was run directly
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*/
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function attachCallback(_src, _callback, _context)
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{
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if (typeof _callback === 'undefined') return;
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switch (typeof files[_src])
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{
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case 'undefined':
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case 'boolean':
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_callback.call(_context);
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return false;
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}
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if (typeof callbacks[_src] === 'undefined')
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{
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callbacks[_src] = [];
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contexts[_src] = [];
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callbacks[_src].push(_callback);
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contexts[_src].push(_context);
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var scriptnode = files[_src];
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// Setup the 'onload' handler for FF, Opera, Chrome
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scriptnode.onload = function(e) {
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egw.debug('info', 'Retrieved JS file "%s" from server', _jsFile);
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_callback.call(_context, _jsFile);
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egw.debug('info', 'Retrieved JS file "%s" from server', _src);
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runCallbacks.call(this, _src);
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};
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// IE
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@ -85,16 +128,85 @@ egw.extend('files', egw.MODULE_WND_LOCAL, function(_app, _wnd) {
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var node = _wnd.event.srcElement;
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if (node.readyState == 'complete' || node.readyState == 'loaded')
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{
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egw.debug('info', 'Retrieved JS file "%s" from server', _jsFile);
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_callback.call(_context, _jsFile);
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egw.debug('info', 'Retrieved JS file "%s" from server', _src);
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runCallbacks.call(this, _src);
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}
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};
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}
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else
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{
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alreadyLoaded = true;
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runCallbacks.call(this, _src);
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return false;
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}
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}
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}
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else
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{
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callbacks[_src].push(_callback);
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contexts[_src].push(_context);
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}
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return true;
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}
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/**
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* Run all callbacks of a given source
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*
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* @param _src url of file (already run throught removeTS!)
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*/
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function runCallbacks(_src)
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{
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if (typeof callbacks[_src] === 'undefined') return;
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egw.debug('info', 'Running %d callbacks for JS file "%s"', callbacks[_src].length, _src);
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for(var i = 0; i < callbacks[_src].length; i++)
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{
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callbacks[_src][i].call(contexts[_src][i]);
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}
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delete callbacks[_src];
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delete contexts[_src];
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}
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/**
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* Gather all already loaded JavaScript and CSS files on document load.
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*/
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// Iterate over the script tags
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var scripts = _wnd.document.getElementsByTagName('script');
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for (var i = 0; i < scripts.length; i++)
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{
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addFile(scripts[i].getAttribute('src'), scripts[i]);
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}
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// Iterate over the link tags
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var links = _wnd.document.getElementsByTagName('link');
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for (var i = 0; i < links.length; i++)
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{
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addFile(links[i].getAttribute('href'));
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}
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/**
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* Include a single javascript file and call given callback once it's done
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*
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* If file is already loaded, _callback gets called imediatly
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*
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* @param _jsFile url of file
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* @param _callback
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* @param _context for callback
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*/
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function includeJSFile(_jsFile, _callback, _context)
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{
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var _src = removeTS(_jsFile);
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var alreadyLoaded = isLoaded(_src);
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if (alreadyLoaded === false)
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{
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// Create the script node which contains the new file
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var scriptnode = _wnd.document.createElement('script');
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scriptnode.type = "text/javascript";
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scriptnode.src = _jsFile;
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scriptnode._originalSrc = _jsFile;
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files[_src] = scriptnode;
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// Append the newly create script node to the head
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var head = _wnd.document.getElementsByTagName('head')[0];
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@ -103,28 +215,30 @@ egw.extend('files', egw.MODULE_WND_LOCAL, function(_app, _wnd) {
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// Request the given javascript file
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egw.debug('info', 'Requested JS file "%s" from server', _jsFile);
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}
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else if (alreadyLoaded === true)
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{
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egw.debug('info', 'JS file "%s" already loaded', _jsFile);
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}
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else
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{
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alreadyLoaded = true;
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egw.debug('info', 'JS file "%s" currently loading', _jsFile);
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}
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// If the file is already loaded, call the callback
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if (alreadyLoaded)
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{
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_wnd.setTimeout(
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function() {
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_callback.call(_context, _jsFile);
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}, 0);
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}
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// attach (or just run) callback
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attachCallback(_src, _callback, _context);
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}
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return {
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includeJS: function(_jsFiles, _callback, _context) {
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includeJS: function(_jsFiles, _callback, _context, _prefix) {
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// Also allow including a single javascript file
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if (typeof _jsFiles === 'string')
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{
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_jsFiles = [_jsFiles];
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}
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if (typeof _prefix === 'undefined')
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{
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_prefix = '';
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}
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var loaded = 0;
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@ -132,7 +246,7 @@ egw.extend('files', egw.MODULE_WND_LOCAL, function(_app, _wnd) {
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// the context function
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for (var i = 0; i < _jsFiles.length; i++)
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{
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includeJSFile.call(this, _jsFiles[i], function(_file) {
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includeJSFile.call(this, _prefix+_jsFiles[i], function(_file) {
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loaded++;
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if (loaded == _jsFiles.length && _callback) {
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_callback.call(_context);
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