为jQuery提供一些实用扩展API：Lithium for jQuery
Lithium为jQuery提供一些实用扩展API：
- 数据类型声明: isDefined,isElement...
- 绑定，继承，命名空间...
- 观察模式(发布-订阅模式) 可用于松耦合的模块/组件之间进行通信。
- IE8 JS 1.6 and JS 1.8 polyfills, like string trim, array forEach,lastIndexOf,filter,reduce...
- 浏览器检测(which is still useful in rare cases..like for statistics).
Lithium 依赖于jQuery。Lithium 划分开成模块，所以你可以只导入你所需要的使用的模块。
浏览器支持
最新的Chrome,Firefox,Safari,Opera and IE8+.
API
数据类型
Li.isDefined(val) - 返回true如果val不是undefined.
Li.isElement(o) - Returns true if o is an instance of HTMLElement
Li.isNaN(val) - Returns true if val is NaN.
Similarly Li.isObject, Li.isString, Li.isBoolean.
jQuery already has $.isFunction, $.isNumeric etc.
Patterns
-
Li.namespace(string) - Creates a global namespace.
Li.namespace('app.utils'); -
Li.extend(base, obj) - Classical inheritence
var myClass1 = Li.extend(Object, { constructor: function (cfg) { $.extend(this, cfg); }, prop: "Lithium", method: function () { return 1;}, statics: { //Special property to defined static methods/properties staticProp: "prop" } }); //Create myClass2 using myClass1 as base class. var myClass2 = Li.extend(myClass1, { constructor: function (cfg) { this.super([cfg]); //call base class constructor //alternatively, this.super(arguments); //or this.superClass().constructor.call(this, cfg); }, //Override 'method' method: function () { //Add 1 to the result of base class 'method'. return 1 + this.super(arugments); } }); -
Observable
var Restaurant = Li.extend(Object, { //Methods salesOffer: function () { this.fireEvent('freefood', '1.00 PM'); } }); Li.observable(Restaurant, ['freefood']); //Make class a publisher /*Subscriber/Listener*/ var HungryMan = Li.extend(Object, { constructor: function (name, restaurant) { this.name = name; //Add listener restaurant.on('freefood', function (time) { console.log(name + ' says: Yay! free food!'); }, this); } }); /*----------------------------------*/ /*Demonstration*/ /*----------------------------------*/ var someRestaurant = new Restaurant(); var a = new HungryMan('man1', someRestaurant), b = new HungryMan('man2', someRestaurant); //Somewhere in a onclick event we execute... someRestaurant.salesOffer(); //...this would call all listeners. In this case it will display.. //man1 says: Yay! free food! //man2 says: Yay! free food! -
Li.lbind(fn [, context, args...]) - Binds context and arguments to a function (like the JS.1.8.1 Function.bind). Argument list is prepended to fn.
element.onclick = Li.lbind(function (val, e) { console.log(this === element); //true console.log(val); //10 console.log(e); //If IE9+, you'll get event. }, element, 10); -
Li.rbind - Same as lbind, except that arguments are appended to fn arugment list.
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Li.forEach(obj [, callback, context]) - forEach on any object. For arrays, Array.forEach is called internally.
- Li.uuid([len=10, hypenate=false]) - Returns a random UID with length 'len' and hyphenated if hypenate=true, as string.
- Li.object.value(obj) - Returns all values of an object. Object.keys(obj) would return keys of an object.
- Li.object.size(obj) - Returns the number of enumerable properties of the object.
- Li.string.htmlEncode and Li.string.htmlDecode - Encodes/Decodes >,<," and &.
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Li.format(formatString, ...) - A quick string format method
Li.format('<div class="{0}"></div>, 'box'); Li.format('<div class="{cls}"></div>, {cls: 'box'}); //Both returns '<div class="box"></div>' -
Li.dom(htmlString, ...) - Converts htmlString to DOM, inserts them into a document fragment and returns the fragment. Internally this uses Li.format for string formatting.
var df = Cu.dom('<div class="{cls}" data-id="{id}"></div>', {cls: 'box', id: Cu.uuid()}); //DocumentFragment document.body.appendChild(df);
Browser Detection
Li.isIE - will be set when browser is MS IE. Li.isIE9 - will be set when browser is MS IE 9. Li.isChrome Li.isWebKit ...similar for other browsers and versions Li.isAndroid Li.isIPhone Li.isIPad Li.isMobile - True if iPhone, Android, BlackBerry (Phone), Windows Phone or Symbian. Additionally: Li.browser.name - e.g. 'IE' Li.browser.version - e.g. '9' Li.browser.OS - e.g. 'Windows' Li.browser.OSVersion (set if available) - e.g. '6.1'