mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-09 01:25:22 +01:00
514 lines
19 KiB
JavaScript
Executable File
514 lines
19 KiB
JavaScript
Executable File
/*! LAB.js (LABjs :: Loading And Blocking JavaScript)
|
|
v2.0.3 (c) Kyle Simpson
|
|
MIT License
|
|
*/
|
|
|
|
(function(global){
|
|
var _$LAB = global.$LAB,
|
|
|
|
// constants for the valid keys of the options object
|
|
_UseLocalXHR = "UseLocalXHR",
|
|
_AlwaysPreserveOrder = "AlwaysPreserveOrder",
|
|
_AllowDuplicates = "AllowDuplicates",
|
|
_CacheBust = "CacheBust",
|
|
/*!START_DEBUG*/_Debug = "Debug",/*!END_DEBUG*/
|
|
_BasePath = "BasePath",
|
|
|
|
// stateless variables used across all $LAB instances
|
|
root_page = /^[^?#]*\//.exec(location.href)[0],
|
|
root_domain = /^\w+\:\/\/\/?[^\/]+/.exec(root_page)[0],
|
|
append_to = document.head || document.getElementsByTagName("head"),
|
|
|
|
// inferences... ick, but still necessary
|
|
opera_or_gecko = (global.opera && Object.prototype.toString.call(global.opera) == "[object Opera]") || ("MozAppearance" in document.documentElement.style),
|
|
|
|
/*!START_DEBUG*/
|
|
// console.log() and console.error() wrappers
|
|
log_msg = function(){},
|
|
log_error = log_msg,
|
|
/*!END_DEBUG*/
|
|
|
|
// feature sniffs (yay!)
|
|
test_script_elem = document.createElement("script"),
|
|
explicit_preloading = typeof test_script_elem.preload == "boolean", // http://wiki.whatwg.org/wiki/Script_Execution_Control#Proposal_1_.28Nicholas_Zakas.29
|
|
real_preloading = explicit_preloading || (test_script_elem.readyState && test_script_elem.readyState == "uninitialized"), // will a script preload with `src` set before DOM append?
|
|
script_ordered_async = !real_preloading && test_script_elem.async === true, // http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
|
|
|
|
// XHR preloading (same-domain) and cache-preloading (remote-domain) are the fallbacks (for some browsers)
|
|
xhr_or_cache_preloading = !real_preloading && !script_ordered_async && !opera_or_gecko
|
|
;
|
|
|
|
/*!START_DEBUG*/
|
|
// define console wrapper functions if applicable
|
|
if (global.console && global.console.log) {
|
|
if (!global.console.error) global.console.error = global.console.log;
|
|
log_msg = function(msg) { global.console.log(msg); };
|
|
log_error = function(msg,err) { global.console.error(msg,err); };
|
|
}
|
|
/*!END_DEBUG*/
|
|
|
|
// test for function
|
|
function is_func(func) { return Object.prototype.toString.call(func) == "[object Function]"; }
|
|
|
|
// test for array
|
|
function is_array(arr) { return Object.prototype.toString.call(arr) == "[object Array]"; }
|
|
|
|
// make script URL absolute/canonical
|
|
function canonical_uri(src,base_path) {
|
|
var absolute_regex = /^\w+\:\/\//;
|
|
|
|
// is `src` is protocol-relative (begins with // or ///), prepend protocol
|
|
if (/^\/\/\/?/.test(src)) {
|
|
src = location.protocol + src;
|
|
}
|
|
// is `src` page-relative? (not an absolute URL, and not a domain-relative path, beginning with /)
|
|
else if (!absolute_regex.test(src) && src.charAt(0) != "/") {
|
|
// prepend `base_path`, if any
|
|
src = (base_path || "") + src;
|
|
}
|
|
// make sure to return `src` as absolute
|
|
return absolute_regex.test(src) ? src : ((src.charAt(0) == "/" ? root_domain : root_page) + src);
|
|
}
|
|
|
|
// merge `source` into `target`
|
|
function merge_objs(source,target) {
|
|
for (var k in source) { if (source.hasOwnProperty(k)) {
|
|
target[k] = source[k]; // TODO: does this need to be recursive for our purposes?
|
|
}}
|
|
return target;
|
|
}
|
|
|
|
// does the chain group have any ready-to-execute scripts?
|
|
function check_chain_group_scripts_ready(chain_group) {
|
|
var any_scripts_ready = false;
|
|
for (var i=0; i<chain_group.scripts.length; i++) {
|
|
if (chain_group.scripts[i].ready && chain_group.scripts[i].exec_trigger) {
|
|
any_scripts_ready = true;
|
|
chain_group.scripts[i].exec_trigger();
|
|
chain_group.scripts[i].exec_trigger = null;
|
|
}
|
|
}
|
|
return any_scripts_ready;
|
|
}
|
|
|
|
// creates a script load listener
|
|
function create_script_load_listener(elem,registry_item,flag,onload) {
|
|
elem.onload = elem.onreadystatechange = function() {
|
|
if ((elem.readyState && elem.readyState != "complete" && elem.readyState != "loaded") || registry_item[flag]) return;
|
|
elem.onload = elem.onreadystatechange = null;
|
|
onload();
|
|
};
|
|
}
|
|
|
|
// script executed handler
|
|
function script_executed(registry_item) {
|
|
registry_item.ready = registry_item.finished = true;
|
|
for (var i=0; i<registry_item.finished_listeners.length; i++) {
|
|
registry_item.finished_listeners[i]();
|
|
}
|
|
registry_item.ready_listeners = [];
|
|
registry_item.finished_listeners = [];
|
|
}
|
|
|
|
// make the request for a scriptha
|
|
function request_script(chain_opts,script_obj,registry_item,onload,preload_this_script) {
|
|
// setTimeout() "yielding" prevents some weird race/crash conditions in older browsers
|
|
setTimeout(function(){
|
|
var script, src = script_obj.real_src, xhr;
|
|
|
|
// don't proceed until `append_to` is ready to append to
|
|
if ("item" in append_to) { // check if `append_to` ref is still a live node list
|
|
if (!append_to[0]) { // `append_to` node not yet ready
|
|
// try again in a little bit -- note: will re-call the anonymous function in the outer setTimeout, not the parent `request_script()`
|
|
setTimeout(arguments.callee,25);
|
|
return;
|
|
}
|
|
// reassign from live node list ref to pure node ref -- avoids nasty IE bug where changes to DOM invalidate live node lists
|
|
append_to = append_to[0];
|
|
}
|
|
script = document.createElement("script");
|
|
if (script_obj.type) script.type = script_obj.type;
|
|
if (script_obj.charset) script.charset = script_obj.charset;
|
|
|
|
// should preloading be used for this script?
|
|
if (preload_this_script) {
|
|
// real script preloading?
|
|
if (real_preloading) {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("start script preload: "+src);/*!END_DEBUG*/
|
|
registry_item.elem = script;
|
|
if (explicit_preloading) { // explicit preloading (aka, Zakas' proposal)
|
|
script.preload = true;
|
|
script.onpreload = onload;
|
|
}
|
|
else {
|
|
script.onreadystatechange = function(){
|
|
if (script.readyState == "loaded") onload();
|
|
};
|
|
}
|
|
script.src = src;
|
|
// NOTE: no append to DOM yet, appending will happen when ready to execute
|
|
}
|
|
// same-domain and XHR allowed? use XHR preloading
|
|
else if (preload_this_script && src.indexOf(root_domain) == 0 && chain_opts[_UseLocalXHR]) {
|
|
xhr = new XMLHttpRequest(); // note: IE never uses XHR (it supports true preloading), so no more need for ActiveXObject fallback for IE <= 7
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("start script preload (xhr): "+src);/*!END_DEBUG*/
|
|
xhr.onreadystatechange = function() {
|
|
if (xhr.readyState == 4) {
|
|
xhr.onreadystatechange = function(){}; // fix a memory leak in IE
|
|
registry_item.text = xhr.responseText + "\n//@ sourceURL=" + src; // http://blog.getfirebug.com/2009/08/11/give-your-eval-a-name-with-sourceurl/
|
|
onload();
|
|
}
|
|
};
|
|
xhr.open("GET",src);
|
|
xhr.send();
|
|
}
|
|
// as a last resort, use cache-preloading
|
|
else {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("start script preload (cache): "+src);/*!END_DEBUG*/
|
|
script.type = "text/cache-script";
|
|
create_script_load_listener(script,registry_item,"ready",function() {
|
|
append_to.removeChild(script);
|
|
onload();
|
|
});
|
|
script.src = src;
|
|
append_to.insertBefore(script,append_to.firstChild);
|
|
}
|
|
}
|
|
// use async=false for ordered async? parallel-load-serial-execute http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
|
|
else if (script_ordered_async) {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("start script load (ordered async): "+src);/*!END_DEBUG*/
|
|
script.async = false;
|
|
create_script_load_listener(script,registry_item,"finished",onload);
|
|
script.src = src;
|
|
append_to.insertBefore(script,append_to.firstChild);
|
|
}
|
|
// otherwise, just a normal script element
|
|
else {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("start script load: "+src);/*!END_DEBUG*/
|
|
create_script_load_listener(script,registry_item,"finished",onload);
|
|
script.src = src;
|
|
append_to.insertBefore(script,append_to.firstChild);
|
|
}
|
|
},0);
|
|
}
|
|
|
|
// create a clean instance of $LAB
|
|
function create_sandbox() {
|
|
var global_defaults = {},
|
|
can_use_preloading = real_preloading || xhr_or_cache_preloading,
|
|
queue = [],
|
|
registry = {},
|
|
instanceAPI
|
|
;
|
|
|
|
// global defaults
|
|
global_defaults[_UseLocalXHR] = true;
|
|
global_defaults[_AlwaysPreserveOrder] = false;
|
|
global_defaults[_AllowDuplicates] = false;
|
|
global_defaults[_CacheBust] = false;
|
|
/*!START_DEBUG*/global_defaults[_Debug] = false;/*!END_DEBUG*/
|
|
global_defaults[_BasePath] = "";
|
|
|
|
// execute a script that has been preloaded already
|
|
function execute_preloaded_script(chain_opts,script_obj,registry_item) {
|
|
var script;
|
|
|
|
function preload_execute_finished() {
|
|
if (script != null) { // make sure this only ever fires once
|
|
script = null;
|
|
script_executed(registry_item);
|
|
}
|
|
}
|
|
|
|
if (registry[script_obj.src].finished) return;
|
|
if (!chain_opts[_AllowDuplicates]) registry[script_obj.src].finished = true;
|
|
|
|
script = registry_item.elem || document.createElement("script");
|
|
if (script_obj.type) script.type = script_obj.type;
|
|
if (script_obj.charset) script.charset = script_obj.charset;
|
|
create_script_load_listener(script,registry_item,"finished",preload_execute_finished);
|
|
|
|
// script elem was real-preloaded
|
|
if (registry_item.elem) {
|
|
registry_item.elem = null;
|
|
}
|
|
// script was XHR preloaded
|
|
else if (registry_item.text) {
|
|
script.onload = script.onreadystatechange = null; // script injection doesn't fire these events
|
|
script.text = registry_item.text;
|
|
}
|
|
// script was cache-preloaded
|
|
else {
|
|
script.src = script_obj.real_src;
|
|
}
|
|
append_to.insertBefore(script,append_to.firstChild);
|
|
|
|
// manually fire execution callback for injected scripts, since events don't fire
|
|
if (registry_item.text) {
|
|
preload_execute_finished();
|
|
}
|
|
}
|
|
|
|
// process the script request setup
|
|
function do_script(chain_opts,script_obj,chain_group,preload_this_script) {
|
|
var registry_item,
|
|
registry_items,
|
|
ready_cb = function(){ script_obj.ready_cb(script_obj,function(){ execute_preloaded_script(chain_opts,script_obj,registry_item); }); },
|
|
finished_cb = function(){ script_obj.finished_cb(script_obj,chain_group); }
|
|
;
|
|
|
|
script_obj.src = canonical_uri(script_obj.src,chain_opts[_BasePath]);
|
|
script_obj.real_src = script_obj.src +
|
|
// append cache-bust param to URL?
|
|
(chain_opts[_CacheBust] ? ((/\?.*$/.test(script_obj.src) ? "&_" : "?_") + ~~(Math.random()*1E9) + "=") : "")
|
|
;
|
|
|
|
if (!registry[script_obj.src]) registry[script_obj.src] = {items:[],finished:false};
|
|
registry_items = registry[script_obj.src].items;
|
|
|
|
// allowing duplicates, or is this the first recorded load of this script?
|
|
if (chain_opts[_AllowDuplicates] || registry_items.length == 0) {
|
|
registry_item = registry_items[registry_items.length] = {
|
|
ready:false,
|
|
finished:false,
|
|
ready_listeners:[ready_cb],
|
|
finished_listeners:[finished_cb]
|
|
};
|
|
|
|
request_script(chain_opts,script_obj,registry_item,
|
|
// which callback type to pass?
|
|
(
|
|
(preload_this_script) ? // depends on script-preloading
|
|
function(){
|
|
registry_item.ready = true;
|
|
for (var i=0; i<registry_item.ready_listeners.length; i++) {
|
|
registry_item.ready_listeners[i]();
|
|
}
|
|
registry_item.ready_listeners = [];
|
|
} :
|
|
function(){ script_executed(registry_item); }
|
|
),
|
|
// signal if script-preloading should be used or not
|
|
preload_this_script
|
|
);
|
|
}
|
|
else {
|
|
registry_item = registry_items[0];
|
|
if (registry_item.finished) {
|
|
finished_cb();
|
|
}
|
|
else {
|
|
registry_item.finished_listeners.push(finished_cb);
|
|
}
|
|
}
|
|
}
|
|
|
|
// creates a closure for each separate chain spawned from this $LAB instance, to keep state cleanly separated between chains
|
|
function create_chain() {
|
|
var chainedAPI,
|
|
chain_opts = merge_objs(global_defaults,{}),
|
|
chain = [],
|
|
exec_cursor = 0,
|
|
scripts_currently_loading = false,
|
|
group
|
|
;
|
|
|
|
// called when a script has finished preloading
|
|
function chain_script_ready(script_obj,exec_trigger) {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("script preload finished: "+script_obj.real_src);/*!END_DEBUG*/
|
|
script_obj.ready = true;
|
|
script_obj.exec_trigger = exec_trigger;
|
|
advance_exec_cursor(); // will only check for 'ready' scripts to be executed
|
|
}
|
|
|
|
// called when a script has finished executing
|
|
function chain_script_executed(script_obj,chain_group) {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("script execution finished: "+script_obj.real_src);/*!END_DEBUG*/
|
|
script_obj.ready = script_obj.finished = true;
|
|
script_obj.exec_trigger = null;
|
|
// check if chain group is all finished
|
|
for (var i=0; i<chain_group.scripts.length; i++) {
|
|
if (!chain_group.scripts[i].finished) return;
|
|
}
|
|
// chain_group is all finished if we get this far
|
|
chain_group.finished = true;
|
|
advance_exec_cursor();
|
|
}
|
|
|
|
// main driver for executing each part of the chain
|
|
function advance_exec_cursor() {
|
|
while (exec_cursor < chain.length) {
|
|
if (is_func(chain[exec_cursor])) {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_msg("$LAB.wait() executing: "+chain[exec_cursor]);/*!END_DEBUG*/
|
|
try { chain[exec_cursor++](); } catch (err) {
|
|
/*!START_DEBUG*/if (chain_opts[_Debug]) log_error("$LAB.wait() error caught: ",err);/*!END_DEBUG*/
|
|
}
|
|
continue;
|
|
}
|
|
else if (!chain[exec_cursor].finished) {
|
|
if (check_chain_group_scripts_ready(chain[exec_cursor])) continue;
|
|
break;
|
|
}
|
|
exec_cursor++;
|
|
}
|
|
// we've reached the end of the chain (so far)
|
|
if (exec_cursor == chain.length) {
|
|
scripts_currently_loading = false;
|
|
group = false;
|
|
}
|
|
}
|
|
|
|
// setup next chain script group
|
|
function init_script_chain_group() {
|
|
if (!group || !group.scripts) {
|
|
chain.push(group = {scripts:[],finished:true});
|
|
}
|
|
}
|
|
|
|
// API for $LAB chains
|
|
chainedAPI = {
|
|
// start loading one or more scripts
|
|
script:function(){
|
|
for (var i=0; i<arguments.length; i++) {
|
|
(function(script_obj,script_list){
|
|
var splice_args;
|
|
|
|
if (!is_array(script_obj)) {
|
|
script_list = [script_obj];
|
|
}
|
|
for (var j=0; j<script_list.length; j++) {
|
|
init_script_chain_group();
|
|
script_obj = script_list[j];
|
|
|
|
if (is_func(script_obj)) script_obj = script_obj();
|
|
if (!script_obj) continue;
|
|
if (is_array(script_obj)) {
|
|
// set up an array of arguments to pass to splice()
|
|
splice_args = [].slice.call(script_obj); // first include the actual array elements we want to splice in
|
|
splice_args.unshift(j,1); // next, put the `index` and `howMany` parameters onto the beginning of the splice-arguments array
|
|
[].splice.apply(script_list,splice_args); // use the splice-arguments array as arguments for splice()
|
|
j--; // adjust `j` to account for the loop's subsequent `j++`, so that the next loop iteration uses the same `j` index value
|
|
continue;
|
|
}
|
|
if (typeof script_obj == "string") script_obj = {src:script_obj};
|
|
script_obj = merge_objs(script_obj,{
|
|
ready:false,
|
|
ready_cb:chain_script_ready,
|
|
finished:false,
|
|
finished_cb:chain_script_executed
|
|
});
|
|
group.finished = false;
|
|
group.scripts.push(script_obj);
|
|
|
|
do_script(chain_opts,script_obj,group,(can_use_preloading && scripts_currently_loading));
|
|
scripts_currently_loading = true;
|
|
|
|
if (chain_opts[_AlwaysPreserveOrder]) chainedAPI.wait();
|
|
}
|
|
})(arguments[i],arguments[i]);
|
|
}
|
|
return chainedAPI;
|
|
},
|
|
// force LABjs to pause in execution at this point in the chain, until the execution thus far finishes, before proceeding
|
|
wait:function(){
|
|
if (arguments.length > 0) {
|
|
for (var i=0; i<arguments.length; i++) {
|
|
chain.push(arguments[i]);
|
|
}
|
|
group = chain[chain.length-1];
|
|
}
|
|
else group = false;
|
|
|
|
advance_exec_cursor();
|
|
|
|
return chainedAPI;
|
|
}
|
|
};
|
|
|
|
// the first chain link API (includes `setOptions` only this first time)
|
|
return {
|
|
script:chainedAPI.script,
|
|
wait:chainedAPI.wait,
|
|
setOptions:function(opts){
|
|
merge_objs(opts,chain_opts);
|
|
return chainedAPI;
|
|
}
|
|
};
|
|
}
|
|
|
|
// API for each initial $LAB instance (before chaining starts)
|
|
instanceAPI = {
|
|
// main API functions
|
|
setGlobalDefaults:function(opts){
|
|
merge_objs(opts,global_defaults);
|
|
return instanceAPI;
|
|
},
|
|
setOptions:function(){
|
|
return create_chain().setOptions.apply(null,arguments);
|
|
},
|
|
script:function(){
|
|
return create_chain().script.apply(null,arguments);
|
|
},
|
|
wait:function(){
|
|
return create_chain().wait.apply(null,arguments);
|
|
},
|
|
|
|
// built-in queuing for $LAB `script()` and `wait()` calls
|
|
// useful for building up a chain programmatically across various script locations, and simulating
|
|
// execution of the chain
|
|
queueScript:function(){
|
|
queue[queue.length] = {type:"script", args:[].slice.call(arguments)};
|
|
return instanceAPI;
|
|
},
|
|
queueWait:function(){
|
|
queue[queue.length] = {type:"wait", args:[].slice.call(arguments)};
|
|
return instanceAPI;
|
|
},
|
|
runQueue:function(){
|
|
var $L = instanceAPI, len=queue.length, i=len, val;
|
|
for (;--i>=0;) {
|
|
val = queue.shift();
|
|
$L = $L[val.type].apply(null,val.args);
|
|
}
|
|
return $L;
|
|
},
|
|
|
|
// rollback `[global].$LAB` to what it was before this file was loaded, the return this current instance of $LAB
|
|
noConflict:function(){
|
|
global.$LAB = _$LAB;
|
|
return instanceAPI;
|
|
},
|
|
|
|
// create another clean instance of $LAB
|
|
sandbox:function(){
|
|
return create_sandbox();
|
|
}
|
|
};
|
|
|
|
return instanceAPI;
|
|
}
|
|
|
|
// create the main instance of $LAB
|
|
global.$LAB = create_sandbox();
|
|
|
|
|
|
/* The following "hack" was suggested by Andrea Giammarchi and adapted from: http://webreflection.blogspot.com/2009/11/195-chars-to-help-lazy-loading.html
|
|
NOTE: this hack only operates in FF and then only in versions where document.readyState is not present (FF < 3.6?).
|
|
|
|
The hack essentially "patches" the **page** that LABjs is loaded onto so that it has a proper conforming document.readyState, so that if a script which does
|
|
proper and safe dom-ready detection is loaded onto a page, after dom-ready has passed, it will still be able to detect this state, by inspecting the now hacked
|
|
document.readyState property. The loaded script in question can then immediately trigger any queued code executions that were waiting for the DOM to be ready.
|
|
For instance, jQuery 1.4+ has been patched to take advantage of document.readyState, which is enabled by this hack. But 1.3.2 and before are **not** safe or
|
|
fixed by this hack, and should therefore **not** be lazy-loaded by script loader tools such as LABjs.
|
|
*/
|
|
(function(addEvent,domLoaded,handler){
|
|
if (document.readyState == null && document[addEvent]){
|
|
document.readyState = "loading";
|
|
document[addEvent](domLoaded,handler = function(){
|
|
document.removeEventListener(domLoaded,handler,false);
|
|
document.readyState = "complete";
|
|
},false);
|
|
}
|
|
})("addEventListener","DOMContentLoaded");
|
|
|
|
})(this); |