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[third] Add Lazyload.js

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This is a small, MIT-licensed lib from https://github.com/rgrove/lazyload

(imported from commit c6e43c06dfe3fa8559b2a3d28a48d9e0a6848283)
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Scott Feeney
2013-08-26 12:35:25 -04:00
parent 96a2f0d907
commit 95719a91cf
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LazyLoad Changelog
================================================================================
Version 2.0.3 (2011-07-05)
* Fixed a bug caused by an unwanted Closure Compiler optimization that broke
CSS load completion detection in Gecko when using the minified version of
LazyLoad. [Allex Wang]
* Fixed a race condition in which a URL could be removed from the "pending"
queue if it finished loading before other URLs in the same batch had been
added to the queue, resulting in the queue's length changing unexpectedly
during iteration. [Klaas Neirinck]
Version 2.0.2 (2011-04-17)
* Added support for reliable detection of CSS load completion in Gecko
browsers based on a technique described by Zach Leatherman at
<http://www.zachleat.com/web/2010/07/29/load-css-dynamically/>.
* Fixed a bug that prevented CSS load completion from being detected in WebKit
when there were no other stylesheets on the page. [Klaas Neirinck]
* Fixed a bug that could prevent CSS callbacks from being called in IE.
Version 2.0.1 (2011-03-05)
* Added support for async=false. This ensures that parallel script loading
still works in Firefox 4 while preserving execution order. For more info,
see <http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order>.
* Stylesheet load completion is now detected reliably in WebKit by polling
document.styleSheets for changes. Thanks to Jonathan Cook for suggesting
this solution.
* Dynamically created script and link nodes are now given a "lazyload" class
so they can be identified later.
* The charset for dynamically created script and link nodes is set to "utf-8".
Version 2.0.0 (2009-08-06)
* Added support for CSS. Caveat: Gecko and WebKit don't support the onload
event for link nodes, so the CSS callback will fire almost immediately in
those browsers.
* When an array of URLs is specified, the resources will be loaded in parallel
in browsers that support it. Currently, all browsers support loading CSS in
parallel, but only Gecko and Opera support parallel scripts while preserving
execution order.
* The load() method has been replaced by css() and js() methods for loading
CSS and JS, respectively.
* The loadOnce() method has been removed, since it wasn't terribly useful.
* Improved reliability in all supported browsers.
Version 1.0.4 (2008-07-24)
* Improved reliability with all supported browsers.
* Reduced the minified size to 1751 bytes (a whopping 67 bytes smaller than
version 1.0.3).
* Fixed a bug that caused the load completion callback to fire immediately in
Safari 3.x.
* Fixed a bug that caused the load completion callback to fail to fire in
Internet Explorer if the script was loaded from the cache.
Version 1.0.3 (2007-06-18)
* Added "force" parameter to the loadOnce() method to force execution of the
callback even when all specified scripts have already been loaded.
Version 1.0.2 (2007-06-02)
* Improved browser detection.
* Switched to NaturalDocs for source documentation.
Version 1.0.1 (2007-05-30)
* Fixed potential race condition when load() is called multiple times in
succession.
* Refactored to reduce complexity.
Version 1.0.0 (2007-05-29)
* First release.

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Copyright (c) 2011 Ryan Grove <ryan@wonko.com>
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the 'Software'), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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LazyLoad
========
LazyLoad is a tiny (only 966 bytes minified and gzipped), dependency-free
JavaScript utility that makes it super easy to load external JavaScript and CSS
files on demand.
Whenever possible, LazyLoad will automatically load resources in parallel while
ensuring execution order when you specify an array of URLs to load. In browsers
that don't preserve the execution order of asynchronously-loaded scripts,
LazyLoad will safely load the scripts sequentially.
Use LazyLoad when you need a small, fast, safe dynamic JS or CSS loader, but
don't need the overhead of dependency management or other extra functionality
that larger script loaders provide.
Downloads
---------
* [lazyload.js](https://github.com/rgrove/lazyload/raw/master/lazyload.js) (full source)
Usage
-----
Using LazyLoad is simple. Just call the appropriate method -- `css()` to load
CSS, `js()` to load JavaScript -- and pass in a URL or array of URLs to load.
You can also provide a callback function if you'd like to be notified when the
resources have finished loading, as well as an argument to pass to the callback
and a context in which to execute the callback.
```js
// Load a single JavaScript file and execute a callback when it finishes.
LazyLoad.js('http://example.com/foo.js', function () {
alert('foo.js has been loaded');
});
// Load multiple JS files and execute a callback when they've all finished.
LazyLoad.js(['foo.js', 'bar.js', 'baz.js'], function () {
alert('all files have been loaded');
});
// Load a CSS file and pass an argument to the callback function.
LazyLoad.css('foo.css', function (arg) {
alert(arg);
}, 'foo.css has been loaded');
// Load a CSS file and execute the callback in a different scope.
LazyLoad.css('foo.css', function () {
alert(this.foo); // displays 'bar'
}, null, {foo: 'bar'});
```
Supported Browsers
------------------
* Firefox 2+
* Google Chrome
* Internet Explorer 6+
* Opera 9+
* Safari 3+
* Mobile Safari
* Android
Other browsers may work, but haven't been tested. It's a safe bet that anything
based on a recent version of Gecko or WebKit will probably work.
Caveats
-------
All browsers support parallel loading of CSS. However, only Firefox and Opera
currently support parallel script loading while preserving execution order. To
ensure that scripts are always executed in the correct order, LazyLoad will load
all scripts sequentially in browsers other than Firefox and Opera. Hopefully
other browsers will improve their parallel script loading behavior soon.
License
-------
Copyright (c) 2011 Ryan Grove (ryan@wonko.com).
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the 'Software'), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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/*jslint browser: true, eqeqeq: true, bitwise: true, newcap: true, immed: true, regexp: false */
/**
LazyLoad makes it easy and painless to lazily load one or more external
JavaScript or CSS files on demand either during or after the rendering of a web
page.
Supported browsers include Firefox 2+, IE6+, Safari 3+ (including Mobile
Safari), Google Chrome, and Opera 9+. Other browsers may or may not work and
are not officially supported.
Visit https://github.com/rgrove/lazyload/ for more info.
Copyright (c) 2011 Ryan Grove <ryan@wonko.com>
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the 'Software'), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
@module lazyload
@class LazyLoad
@static
*/
LazyLoad = (function (doc) {
// -- Private Variables ------------------------------------------------------
// User agent and feature test information.
var env,
// Reference to the <head> element (populated lazily).
head,
// Requests currently in progress, if any.
pending = {},
// Number of times we've polled to check whether a pending stylesheet has
// finished loading. If this gets too high, we're probably stalled.
pollCount = 0,
// Queued requests.
queue = {css: [], js: []},
// Reference to the browser's list of stylesheets.
styleSheets = doc.styleSheets;
// -- Private Methods --------------------------------------------------------
/**
Creates and returns an HTML element with the specified name and attributes.
@method createNode
@param {String} name element name
@param {Object} attrs name/value mapping of element attributes
@return {HTMLElement}
@private
*/
function createNode(name, attrs) {
var node = doc.createElement(name), attr;
for (attr in attrs) {
if (attrs.hasOwnProperty(attr)) {
node.setAttribute(attr, attrs[attr]);
}
}
return node;
}
/**
Called when the current pending resource of the specified type has finished
loading. Executes the associated callback (if any) and loads the next
resource in the queue.
@method finish
@param {String} type resource type ('css' or 'js')
@private
*/
function finish(type) {
var p = pending[type],
callback,
urls;
if (p) {
callback = p.callback;
urls = p.urls;
urls.shift();
pollCount = 0;
// If this is the last of the pending URLs, execute the callback and
// start the next request in the queue (if any).
if (!urls.length) {
callback && callback.call(p.context, p.obj);
pending[type] = null;
queue[type].length && load(type);
}
}
}
/**
Populates the <code>env</code> variable with user agent and feature test
information.
@method getEnv
@private
*/
function getEnv() {
var ua = navigator.userAgent;
env = {
// True if this browser supports disabling async mode on dynamically
// created script nodes. See
// http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
async: doc.createElement('script').async === true
};
(env.webkit = /AppleWebKit\//.test(ua))
|| (env.ie = /MSIE|Trident/.test(ua))
|| (env.opera = /Opera/.test(ua))
|| (env.gecko = /Gecko\//.test(ua))
|| (env.unknown = true);
}
/**
Loads the specified resources, or the next resource of the specified type
in the queue if no resources are specified. If a resource of the specified
type is already being loaded, the new request will be queued until the
first request has been finished.
When an array of resource URLs is specified, those URLs will be loaded in
parallel if it is possible to do so while preserving execution order. All
browsers support parallel loading of CSS, but only Firefox and Opera
support parallel loading of scripts. In other browsers, scripts will be
queued and loaded one at a time to ensure correct execution order.
@method load
@param {String} type resource type ('css' or 'js')
@param {String|Array} urls (optional) URL or array of URLs to load
@param {Function} callback (optional) callback function to execute when the
resource is loaded
@param {Object} obj (optional) object to pass to the callback function
@param {Object} context (optional) if provided, the callback function will
be executed in this object's context
@private
*/
function load(type, urls, callback, obj, context) {
var _finish = function () { finish(type); },
isCSS = type === 'css',
nodes = [],
i, len, node, p, pendingUrls, url;
env || getEnv();
if (urls) {
// If urls is a string, wrap it in an array. Otherwise assume it's an
// array and create a copy of it so modifications won't be made to the
// original.
urls = typeof urls === 'string' ? [urls] : urls.concat();
// Create a request object for each URL. If multiple URLs are specified,
// the callback will only be executed after all URLs have been loaded.
//
// Sadly, Firefox and Opera are the only browsers capable of loading
// scripts in parallel while preserving execution order. In all other
// browsers, scripts must be loaded sequentially.
//
// All browsers respect CSS specificity based on the order of the link
// elements in the DOM, regardless of the order in which the stylesheets
// are actually downloaded.
if (isCSS || env.async || env.gecko || env.opera) {
// Load in parallel.
queue[type].push({
urls : urls,
callback: callback,
obj : obj,
context : context
});
} else {
// Load sequentially.
for (i = 0, len = urls.length; i < len; ++i) {
queue[type].push({
urls : [urls[i]],
callback: i === len - 1 ? callback : null, // callback is only added to the last URL
obj : obj,
context : context
});
}
}
}
// If a previous load request of this type is currently in progress, we'll
// wait our turn. Otherwise, grab the next item in the queue.
if (pending[type] || !(p = pending[type] = queue[type].shift())) {
return;
}
head || (head = doc.head || doc.getElementsByTagName('head')[0]);
pendingUrls = p.urls;
for (i = 0, len = pendingUrls.length; i < len; ++i) {
url = pendingUrls[i];
if (isCSS) {
node = env.gecko ? createNode('style') : createNode('link', {
href: url,
rel : 'stylesheet'
});
} else {
node = createNode('script', {src: url});
node.async = false;
}
node.className = 'lazyload';
node.setAttribute('charset', 'utf-8');
if (env.ie && !isCSS && 'onreadystatechange' in node && !('draggable' in node)) {
node.onreadystatechange = function () {
if (/loaded|complete/.test(node.readyState)) {
node.onreadystatechange = null;
_finish();
}
};
} else if (isCSS && (env.gecko || env.webkit)) {
// Gecko and WebKit don't support the onload event on link nodes.
if (env.webkit) {
// In WebKit, we can poll for changes to document.styleSheets to
// figure out when stylesheets have loaded.
p.urls[i] = node.href; // resolve relative URLs (or polling won't work)
pollWebKit();
} else {
// In Gecko, we can import the requested URL into a <style> node and
// poll for the existence of node.sheet.cssRules. Props to Zach
// Leatherman for calling my attention to this technique.
node.innerHTML = '@import "' + url + '";';
pollGecko(node);
}
} else {
node.onload = node.onerror = _finish;
}
nodes.push(node);
}
for (i = 0, len = nodes.length; i < len; ++i) {
head.appendChild(nodes[i]);
}
}
/**
Begins polling to determine when the specified stylesheet has finished loading
in Gecko. Polling stops when all pending stylesheets have loaded or after 10
seconds (to prevent stalls).
Thanks to Zach Leatherman for calling my attention to the @import-based
cross-domain technique used here, and to Oleg Slobodskoi for an earlier
same-domain implementation. See Zach's blog for more details:
http://www.zachleat.com/web/2010/07/29/load-css-dynamically/
@method pollGecko
@param {HTMLElement} node Style node to poll.
@private
*/
function pollGecko(node) {
var hasRules;
try {
// We don't really need to store this value or ever refer to it again, but
// if we don't store it, Closure Compiler assumes the code is useless and
// removes it.
hasRules = !!node.sheet.cssRules;
} catch (ex) {
// An exception means the stylesheet is still loading.
pollCount += 1;
if (pollCount < 200) {
setTimeout(function () { pollGecko(node); }, 50);
} else {
// We've been polling for 10 seconds and nothing's happened. Stop
// polling and finish the pending requests to avoid blocking further
// requests.
hasRules && finish('css');
}
return;
}
// If we get here, the stylesheet has loaded.
finish('css');
}
/**
Begins polling to determine when pending stylesheets have finished loading
in WebKit. Polling stops when all pending stylesheets have loaded or after 10
seconds (to prevent stalls).
@method pollWebKit
@private
*/
function pollWebKit() {
var css = pending.css, i;
if (css) {
i = styleSheets.length;
// Look for a stylesheet matching the pending URL.
while (--i >= 0) {
if (styleSheets[i].href === css.urls[0]) {
finish('css');
break;
}
}
pollCount += 1;
if (css) {
if (pollCount < 200) {
setTimeout(pollWebKit, 50);
} else {
// We've been polling for 10 seconds and nothing's happened, which may
// indicate that the stylesheet has been removed from the document
// before it had a chance to load. Stop polling and finish the pending
// request to prevent blocking further requests.
finish('css');
}
}
}
}
return {
/**
Requests the specified CSS URL or URLs and executes the specified
callback (if any) when they have finished loading. If an array of URLs is
specified, the stylesheets will be loaded in parallel and the callback
will be executed after all stylesheets have finished loading.
@method css
@param {String|Array} urls CSS URL or array of CSS URLs to load
@param {Function} callback (optional) callback function to execute when
the specified stylesheets are loaded
@param {Object} obj (optional) object to pass to the callback function
@param {Object} context (optional) if provided, the callback function
will be executed in this object's context
@static
*/
css: function (urls, callback, obj, context) {
load('css', urls, callback, obj, context);
},
/**
Requests the specified JavaScript URL or URLs and executes the specified
callback (if any) when they have finished loading. If an array of URLs is
specified and the browser supports it, the scripts will be loaded in
parallel and the callback will be executed after all scripts have
finished loading.
Currently, only Firefox and Opera support parallel loading of scripts while
preserving execution order. In other browsers, scripts will be
queued and loaded one at a time to ensure correct execution order.
@method js
@param {String|Array} urls JS URL or array of JS URLs to load
@param {Function} callback (optional) callback function to execute when
the specified scripts are loaded
@param {Object} obj (optional) object to pass to the callback function
@param {Object} context (optional) if provided, the callback function
will be executed in this object's context
@static
*/
js: function (urls, callback, obj, context) {
load('js', urls, callback, obj, context);
}
};
})(this.document);

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tools/jslint/check-all.js
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// Global variables, categorized by place of definition.
var globals =
// Third-party libraries
' $ _ jQuery Spinner Handlebars XDate zxcvbn Intl mixpanel Notification Dropbox'
' $ _ jQuery Spinner Handlebars XDate zxcvbn Intl mixpanel Notification'
+ ' LazyLoad Dropbox'
// Node-based unit tests
+ ' module'

1
zproject/settings.py
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@@ -356,6 +356,7 @@ JS_SPECS = {
'third/jquery-throttle-debounce/jquery.ba-throttle-debounce.js',
'third/jquery-idle/jquery.idle.js',
'third/jquery-autosize/jquery.autosize.js',
'third/lazyload/lazyload.js',
'third/spectrum/spectrum.js',
('third/handlebars/handlebars.runtime.js'
if PIPELINE