网上一搜各种插件，什么文件上传，图片浏览 ，Autocomplete等
这些插件，源代码，新手看起来是很吃力的，当然我也是新手，我开始改AutoComplete这个插件一点点，却真不知道如何开始，后面就用Firefox的fireDebug慢慢看。
我也不是专门做前端的，但是总得了解，基本的使用还是得会。
今天，来总结下，最近看的插件的基础知识，这里算个入门，希望能帮到新手党们。
下面是2个非常重要的扩展函数。
$.extend and $.fn.extend
$.extend(object) 可以理解为JQuery 添加一个静态方法。
$.fn.extend(object) 可以理解为JQuery实例添加一个方法。
基本的定义与调用：
/* $.extend 定义与调用 */ $.extend({ fun1: function () { alert("执行方法一"); } }); $.fun1(); /* $.fn.extend 定义与调用 */ $.fn.extend({ fun2: function () { alert("执行方法2"); } }); $(this).fun2(); //等同于 $.fn.fun3 = function () { alert("执行方法三"); } $(this).fun3();
$.extend(target, [object1], [objectN]) 还有个用法,就是合并到第一个object.
该方法主要用于合并两个或更多对象的内容(属性)到第一个对象，并返回合并后的第一对象。如果该方法只有一个参数target，则该参数将扩展jQuery的命名空间，即作为静态方法挂在jQuery全局对象下，如jQuery里的$.ajax、$.getJSON全局函数等，如前面看到的：
值得注意的是：多个对象参数合并时，会破坏第一个对象的结构，所以可传递一个空对象作为第一个参数，如：$.extend({}, object1, object2);
var options = $.extend({},defaults, options);
上面代码就是合并到{}中，然后赋值到options。这个在写插件的时候经常使用，用户可以自己定义某些属性，
插件一般也会定义默认属性，调用上面方法后，如果自定义属性，这使用新属性，否则，则使用默认属性，这个是非常有用的。
$.fn.extend(target)
在jQuery中，$.fn本质上是等于jQuery的原型，即$.fn = $.prototype， 所以该方法实际上是为jQuery原型添加方法，即把target对象的方法添加到jQuery原型中去，这样jQuery对象实例就可以访问添加的方法了，这也是jQuery插件开发常用的方法，特别是添加多个接口时。如：
// 将hello、hello2方法添加到jquery原型中 $.fn.extend({ hello: function() {alert("hello!");}, hello2: function() {alert("hello again!);} });
看看Autocomplete插件使用的该方法。
$.fn.extend({ autocomplete: function(urlOrData, options) { var isUrl = typeof urlOrData == "string"; options = $.extend({}, $.Autocompleter.defaults, { url: isUrl ? urlOrData : null, data: isUrl ? null : urlOrData, delay: isUrl ? $.Autocompleter.defaults.delay : 10 max: options && !options.scroll ? 1000 : 15000 }, options); // if highlight is set to false, replace it with a do-nothing function options.highlight = options.highlight || function(value) { return value; }; // if the formatMatch option is not specified, then use formatItem for backwards compatibility options.formatMatch = options.formatMatch || options.formatItem; return this.each(function() { new $.Autocompleter(this, options); }); }, result: function(handler) { return this.bind("result", handler); }, search: function(handler) { return this.trigger("search", [handler]); }, flushCache: function() { return this.trigger("flushCache"); }, setOptions: function(options){ return this.trigger("setOptions", [options]); }, unautocomplete: function() { return this.trigger("unautocomplete"); } });
看不懂？没关系，下面马来接上。
如果添加单个方法到jQuery原型中，可使用$.fn.pluginName方法添加，如：
// 将hello方法添加到jquery原型中 $.fn.hello = function() { // ... };
插件通用模板（单个方法）：
插件有自己的基本格式：
;(function($){ $.fn.yourName = function(options){ //各种属性、参数 } var options = $.extend(defaults, options); return this.each(function(){ //插件实现代码 }); }; })(jQuery);
上面代码的最前面有一个分号，这是为了防止多个脚本文件合并时，其他脚本的结尾语句没有添加分号，造成运行时错误。
1、把全部代码放在闭包(一个即时执行函数)里
此时闭包相当于一个私有作用域，外部无法访问到内部的信息，并且不会存在全局变量的污染情况。官方创建开发规范的解释是：
a) 避免全局依赖；
b) 避免第三方破坏；
c) 兼容jQuery操作符'$'和'jQuery '。
如下所示：
(function($) { // 局部作用域中使用$来引用jQuery // ... })(jQuery);
这段代码在被解析时可理解成以下代码：
var jQ = function($) { // code goes here }; jQ(jQuery);
新手如果无法理解，你知道，这是官方标准就ok。
下面是这个美化表格的例子，实现原理倒是简单，无非就是找到表格的奇偶行，然后添加不同的class，活动行高亮显示也很简单，只要判断mouseover事件，然后添加一个class，mouseout的时候，再去掉这个class即可。
查看这个链接能看到详细，你可以查看具体看看，写的不错，特别是步骤很清晰。
http://www.cnblogs.com/JustinYoung/archive/2010/03/30/jquery-chajian.html
好，基本框架晓得了，下面就是填充具体内容了。
(function($){ $.fn.tableUI = function(options){ var defaults = { evenRowClass:"evenRow", oddRowClass:"oddRow", activeRowClass:"activeRow" } var options = $.extend({},defaults, options); this.each(function(){ //实现代码 }); }; })(jQuery);
重复一句：
var options = $.extend({}，defaults, options);
其实就是合并多个对象为一个。这里就是，如果你在调用的时候写了新的参数，就用你新的参数，如果没有写，就用默认的参数。想进一步了解的朋友，可以参考jquery的官方文档： http://api.jquery.com/jQuery.extend/
其实，这里定义默认 var defaults是不规则的写法，
规则该是这样
$.fn.TableUI.defaults={
evenRowCass: "evenRow",
oddRowClass: "oddRow",
activeRowClass: "activeRow"
};
options = $.extend({},$.fn.TableUI.defaults,options);
好了，直接看全部代码：
//这里最好写上相关描述，如时间，作者，主要用于干什么
/*
* tableUI 0.1
* Copyright (c) 2009 JustinYoung http://justinyoung.cnblogs.com/
* Date: 2010-03-30
* 使用tableUI可以方便地将表格提示使用体验。先提供的功能有奇偶行颜色交替，鼠标移上高亮显示
*/
;(function($){ $.fn.tableUI = function(options){
$.fn.TableUI.defaults={
evenRowCass: "evenRow",
oddRowClass: "oddRow",
activeRowClass: "activeRow"
};
var options = $.extend({}, $.fn.TableUI.defaults, options); //合并 return this.each(function(){ var thisTable=$(this); //添加奇偶行颜色 $(thisTable).find("tr:even").addClass(options.evenRowClass); $(thisTable).find("tr:odd").addClass(options.oddRowClass); //添加活动行颜色 $(thisTable).find("tr").bind("mouseover",function(){ $(this).addClass(options.activeRowClass); }); $(thisTable).find("tr").bind("mouseout",function(){ $(this).removeClass(options.activeRowClass); }); }); }; })(jQuery);
效果就是下面这个效果，当然会有点不一样，因为我自己重新定义了css样式.：
http://downloads.cnblogs.com/justinyoung/articleIMG/2010/tableUI/index.html
下面是调用代码。
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script> <script src="Scripts/TableUI.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function () { $(".table_solid").TableUI({ evenRowCass: "eventRow", oddRowClass: "oddRowClass", activeRowClass: "activeRow" }); //这里是输入新的参数，不使用默认参数。插件代码会自动覆盖。 }) </script> <style type="text/css"> body { font-family: 'Verdana' , '宋体'; font-size: 12px; } .eventRow { background-color: #f0f0ff; } .activeRow { background-color: #FFFF55; } .oddRowClass { background-color: red; } </style>
在看下面的代码时，涉及到模式，这里介绍两个常用的模式，
单例模式
<script>
/*
* Here’s the setup function which populates an array with integers
*/
var myApp = {
init: function (obj) {
//code to intialize your application
alert("init: " + obj);
},
dashboard: function () {
//your dashboard feature goes here
alert("dashboard");
},
controlPanel: function () {
//control panel code goes here
alert("controlPanel");
},
appSettings: function () {
//code that updates settings goes here
alert("appSettings");
}
}
//kick it off with ready()
$(function () {
myApp.init("test");
myApp.dashboard();
myApp.controlPanel();
myApp.appSettings();
});
</script>
使用应用程序名称空间，可以极大地降低变量名冲突的可能性
模块模式
模块模式主要包含三个主要的组件：一个与前面类似的名称空间，一个立即执行函数和函数返回的对象。
该返回对象包含了共有方法和共有属性。
<script type="text/javascript">
//Our app namespace. We pass in the jQuery object to shorten lookups
var myApp = function ($) { //立即执行函数
// private variables and methods, only available within this myApp //私有变量和方法
var message = "not directly accessible from outside the module";
function multiplier(x, y) {
return x * y
};
//the return object contains the public 函数的返回对象
//properties and public methods
return {
init: function () {
//intialize the app
alert("return init");
},
prop: "42",
specialNumber: function () {
//access to our private method 访问私有方法
var num = multiplier(7, 6);
return "Our special number is definitely " + num;
},
//we provide controlled access to private variables
shareMessage: function (arg) {
if (arg === "open sesame") {
return message + ",unless you know the magic word";
} else {
throw new Error("You need to know the magic word");
}
}
};
} (jQuery);
myApp.dashboard = function ($) {
// private variables and methods
var config = {
"color": "blue",
"title": "my dashboard",
"width": "960px"
};
return {
init: function () {
//intialize the dashboard
},
//updateConfig allows for monitored configuration
//of the private config object
updateConfig: function (obj) {
if ($.inArray(obj.color, ["red", "blue", "green", "purple"] !== -1)) {
config.color = obj.color;
}
config.title = obj.title || config.title;
config.width = obj.width || config.width;
},
render: function () {
//renders the dashboard
var $dashboard = $("<div/>").html("<h1/>")
$dashboard.text(config.title)
.css(
{ "width": config.width,
"color": config.color
}
);
$("#main").append($dashboard);
}
};
} (jQuery);
console.log("message:" + myApp.message ) //undefined
console.log("multiplier" + myApp.multiplier() )
console.log("shareMessage :"+ myApp.shareMessage( "please?" ) )
console.log( myApp.shareMessage( "open sesame" ) )
console.log( myApp.prop );
console.log( myApp.specialNumber() );
</script>
多看一个实例
<script type="text/javascript">
var blogModule = (function () {
var my = {}, privateName = "博客园";
function privateAddTopic(data) {
// 这里是内部处理代码
}
my.Name = privateName;
my.AddTopic = function (data) {
privateAddTopic(data);
};
return my;
} ()); //我们可以在最后一个}后面加上一个括号()，来达到自执行的目的，这样该实例在内存中只会存在一份copy
//注意，匿名函数后面的括号，这是JavaScript语言所要求的，因为如果你不声明的话，
//JavaScript解释器默认是声明一个function函数，有括号，就是创建一个函数表达式，也就是自执行，用的时候不用和上面那样在new了，
//当然你也可以这样来声明：
blogModule.AddTopic('test');
var jspy = (function () {
//首先我们创造一个_count变量，下划线表明它是一个私有变量。在Javascript中下划线并没有什么实际的意义，
//但是它是一个用来标明私有变量的普遍用法。现在函数就可以操纵、返回变量了：
var _count = 0;
var incrementCount = function () {
_count++;
};
var getCount = function () {
return _count;
};
return {
Add: incrementCount,
Get: getCount
};
})();
jspy.Add();
alert(jspy.Get())
//app的名称空间，传入jQuery对象以缩短查找过程
var myApp = function ( $ ) {
//私有变量和方法，仅在该myApp中可用
var message = "not directly accessible from outside the module";
function multiplier(x, y) {
return x * y;
};
//返回对象包含了公有属性和公有方法
return {
init: function () {
//初始化app
alert("初始化app");
},
prop: "42",
specialNumber: function () {
//访问私有方法
var num = multiplier(7, 6);
return "our special number is definitly " + num;
},
//对私有变量的提供有控制的访问
shareMessage: function (arg) {
if (arg === "open sesame") {
return message + ", unless you know the magic word";
}
else {
return ("You need to know the magic word");
}
}
};
}(jQuery);
console.log("access message in myApp:" + myApp.message); //undefined
console.log("call init in return:" + myApp.init()); //
// console.log("call multiplier:" + myApp.multiplier(2, 3)); //throw exception Object doesn't support property or method 'multiplier'
console.log("share message in return " + myApp.shareMessage()) //it's ok
console.log("share arg message in return " + myApp.shareMessage("open sesame")) //it's ok
console.log("show prop in return :" + myApp.prop); //it's work
console.log("show specialNumber in return :" + myApp.specialNumber()); //it's work
</script>
在控制台中测试该实例app,在模块内，可以引用私有变量，但是在模块之外，无法直接调用私有变量
附加自动完成组件源代码
/* * Autocomplete - jQuery plugin 1.1pre * * Copyright (c) 2007 Dylan Verheul, Dan G. Switzer, Anjesh Tuladhar, Jörn Zaefferer * * Dual licensed under the MIT and GPL licenses: * http://www.opensource.org/licenses/mit-license.php * http://www.gnu.org/licenses/gpl.html * * Revision: $Id: jquery.autocomplete.js 5785 2008-07-12 10:37:33Z joern.zaefferer $ */ ;(function($) { $.fn.extend({ autocomplete: function(urlOrData, options) { var isUrl = typeof urlOrData == "string"; options = $.extend({}, $.Autocompleter.defaults, { url: isUrl ? urlOrData : null, data: isUrl ? null : urlOrData, delay: isUrl ? $.Autocompleter.defaults.delay : 0, max: options && !options.scroll ? 9999999 : 9999999 }, options); // if highlight is set to false, replace it with a do-nothing function options.highlight = options.highlight || function(value) { return value; }; // if the formatMatch option is not specified, then use formatItem for backwards compatibility options.formatMatch = options.formatMatch || options.formatItem; return this.each(function() { new $.Autocompleter(this, options); }); }, result: function(handler) { return this.bind("result", handler); }, search: function(handler) { return this.trigger("search", [handler]); }, flushCache: function() { return this.trigger("flushCache"); }, setOptions: function(options){ return this.trigger("setOptions", [options]); }, unautocomplete: function() { return this.trigger("unautocomplete"); } }); $.Autocompleter = function(input, options) { var NO_DATA_FOUND = "No Data Found"; var KEY = { UP: 38, DOWN: 40, DEL: 46, TAB: 9, RETURN: 13, ESC: 27, COMMA: 188, PAGEUP: 33, PAGEDOWN: 34, BACKSPACE: 8 }; // Create $ object for input element var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass); var timeout; var previousValue = ""; var cache = $.Autocompleter.Cache(options); var hasFocus = 0; var lastKeyPressCode; var config = { mouseDownOnSelect: false }; var select = $.Autocompleter.Select(options, input, selectCurrent, config); var blockSubmit; // prevent form submit in opera when selecting with return key $.browser.opera && $(input.form).bind("submit.autocomplete", function() { if (blockSubmit) { blockSubmit = false; return false; } }); // only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all $input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(event) { // track last key pressed lastKeyPressCode = event.keyCode; switch(event.keyCode) { case KEY.UP: event.preventDefault(); if ( select.visible() ) { select.prev(); } else { onChange(0, true); } break; case KEY.DOWN: event.preventDefault(); if ( select.visible() ) { select.next(); } else { onChange(0, true); } break; case KEY.PAGEUP: event.preventDefault(); if ( select.visible() ) { select.pageUp(); } else { onChange(0, true); } break; case KEY.PAGEDOWN: event.preventDefault(); if ( select.visible() ) { select.pageDown(); } else { onChange(0, true); } break; // matches also semicolon case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA: case KEY.TAB: case KEY.RETURN: if( selectCurrent() ) { // stop default to prevent a form submit, Opera needs special handling event.preventDefault(); blockSubmit = true; return false; } break; case KEY.ESC: select.hide(); break; default: clearTimeout(timeout); timeout = setTimeout(onChange, options.delay); break; } }).focus(function(){ // track whether the field has focus, we shouldn't process any // results if the field no longer has focus hasFocus++; }).blur(function() { hasFocus = 0; if (!config.mouseDownOnSelect) { hideResults(); } }).click(function() { // show select when clicking in a focused field if ( hasFocus++ > 1 && !select.visible() ) { onChange(0, true); } }).bind("search", function() { // TODO why not just specifying both arguments? var fn = (arguments.length > 1) ? arguments[1] : null; function findValueCallback(q, data) { var result; if( data && data.length ) { for (var i=0; i < data.length; i++) { if( data[i].result.toLowerCase() == q.toLowerCase() ) { result = data[i]; break; } } } if( typeof fn == "function" ) fn(result); else $input.trigger("result", result && [result.data, result.value]); } $.each(trimWords($input.val()), function(i, value) { request(value, findValueCallback, findValueCallback); }); }).bind("flushCache", function() { cache.flush(); }).bind("setOptions", function() { $.extend(options, arguments[1]); // if we've updated the data, repopulate if ( "data" in arguments[1] ) cache.populate(); }).bind("unautocomplete", function() { select.unbind(); $input.unbind(); $(input.form).unbind(".autocomplete"); }); function selectCurrent() { var selected = select.selected(); if( !selected ) return false; var v = selected.result; previousValue = v; if ( options.multiple ) { var words = trimWords($input.val()); if ( words.length > 1 ) { v = words.slice(0, words.length - 1).join( options.multipleSeparator ) + options.multipleSeparator + v; } v += options.multipleSeparator; } if(v === NO_DATA_FOUND) v = ""; $input.val(v); hideResultsNow(); $input.trigger("result", [selected.data, selected.value]); return true; } function onChange(crap, skipPrevCheck) { if( lastKeyPressCode == KEY.DEL ) { select.hide(); return; } var currentValue = $input.val(); if ( !skipPrevCheck && currentValue == previousValue ) return; previousValue = currentValue; currentValue = lastWord(currentValue); if ( currentValue.length >= options.minChars) { $input.addClass(options.loadingClass); if (!options.matchCase) currentValue = currentValue.toLowerCase(); request(currentValue, receiveData, hideResultsNow); } else { stopLoading(); select.hide(); } }; function trimWords(value) { if ( !value ) { return [""]; } var words = value.split( options.multipleSeparator ); var result = []; $.each(words, function(i, value) { if ( $.trim(value) ) result[i] = $.trim(value); }); return result; } function lastWord(value) { if ( !options.multiple ) return value; var words = trimWords(value); return words[words.length - 1]; } // fills in the input box w/the first match (assumed to be the best match) // q: the term entered // sValue: the first matching result function autoFill(q, sValue){ // autofill in the complete box w/the first match as long as the user hasn't entered in more data // if the last user key pressed was backspace, don't autofill if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) { // fill in the value (keep the case the user has typed) $input.val($input.val() + sValue.substring(lastWord(previousValue).length)); // select the portion of the value not typed by the user (so the next character will erase) $.Autocompleter.Selection(input, previousValue.length, previousValue.length + sValue.length); } }; function hideResults() { clearTimeout(timeout); timeout = setTimeout(hideResultsNow, 200); }; function hideResultsNow() { var wasVisible = select.visible(); select.hide(); clearTimeout(timeout); stopLoading(); if (options.mustMatch) { // call search and run callback $input.search( function (result){ // if no value found, clear the input box if( !result ) { if (options.multiple) { var words = trimWords($input.val()).slice(0, -1); $input.val( words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : "") ); } else $input.val( "" ); } } ); } if (wasVisible) // position cursor at end of input field $.Autocompleter.Selection(input, input.value.length, input.value.length); }; function receiveData(q, data) { if ( data && data.length && hasFocus ) { stopLoading(); select.display(data, q); autoFill(q, data[0].value); select.show(); } else { hideResultsNow(); } }; function request(term, success, failure) { if (!options.matchCase) term = term.toLowerCase(); var data = cache.load(term); // recieve the cached data if (data && data.length) { success(term, data); // if an AJAX url has been supplied, try loading the data now } else if( (typeof options.url == "string") && (options.url.length > 0) ){ var extraParams = { timestamp: +new Date() }; $.each(options.extraParams, function(key, param) { extraParams[key] = typeof param == "function" ? param() : param; }); $.ajax({ // try to leverage ajaxQueue plugin to abort previous requests mode: "abort", // limit abortion to this input port: "autocomplete" + input.name, dataType: options.dataType, url: options.url, data: $.extend({ q: lastWord(term), limit: options.max }, extraParams), success: function(data) { //added by lideng ,for if don't find data ,then assign 'No data found' to control if(!data) data = NO_DATA_FOUND;//alert('No data found'); var parsed = options.parse && options.parse(data) || parse(data); cache.add(term, parsed); success(term, parsed); } }); } else { // if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match select.emptyList(); failure(term); } }; function parse(data) { var parsed = []; var rows = data.split(" "); for (var i=0; i < rows.length; i++) { var row = $.trim(rows[i]); if (row) { row = row.split("|"); parsed[parsed.length] = { data: row, value: row[0], result: options.formatResult && options.formatResult(row, row[0]) || row[0] }; } } return parsed; }; function stopLoading() { $input.removeClass(options.loadingClass); }; }; $.Autocompleter.defaults = { inputClass: "ac_input", resultsClass: "ac_results", loadingClass: "ac_loading", minChars: 1, //delay: 400, delay: 0, matchCase: false, //matchSubset: true, matchSubset: false, matchContains: false, cacheLength: 10, max: 100, mustMatch: false, extraParams: {}, selectFirst: true, formatItem: function(row) { return row[0]; }, formatMatch: null, autoFill: false, 0, multiple: false, multipleSeparator: ", ", highlight: function(value, term) { return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([^$()[]{}*.+?|\])/gi, "\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>"); }, scroll: true, scrollHeight: 180 }; $.Autocompleter.Cache = function(options) { var data = {}; var length = 0; function matchSubset(s, sub) { if (!options.matchCase) s = s.toLowerCase(); var i = s.indexOf(sub); if (options.matchContains == "word"){ i = s.toLowerCase().search("\b" + sub.toLowerCase()); } if (i == -1) return false; return i == 0 || options.matchContains; }; function add(q, value) { if (length > options.cacheLength){ flush(); } if (!data[q]){ length++; } data[q] = value; } function populate(){ if( !options.data ) return false; // track the matches var stMatchSets = {}, nullData = 0; // no url was specified, we need to adjust the cache length to make sure it fits the local data store if( !options.url ) options.cacheLength = 1; // track all options for minChars = 0 stMatchSets[""] = []; // loop through the array and create a lookup structure for ( var i = 0, ol = options.data.length; i < ol; i++ ) { var rawValue = options.data[i]; // if rawValue is a string, make an array otherwise just reference the array rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue; var value = options.formatMatch(rawValue, i+1, options.data.length); if ( value === false ) continue; var firstChar = value.charAt(0).toLowerCase(); // if no lookup array for this character exists, look it up now if( !stMatchSets[firstChar] ) stMatchSets[firstChar] = []; // if the match is a string var row = { value: value, data: rawValue, result: options.formatResult && options.formatResult(rawValue) || value }; // push the current match into the set list stMatchSets[firstChar].push(row); // keep track of minChars zero items if ( nullData++ < options.max ) { stMatchSets[""].push(row); } }; // add the data items to the cache $.each(stMatchSets, function(i, value) { // increase the cache size options.cacheLength++; // add to the cache add(i, value); }); } // populate any existing data setTimeout(populate, 25); function flush(){ data = {}; length = 0; } return { flush: flush, add: add, populate: populate, load: function(q) { if (!options.cacheLength || !length) return null; /* * if dealing w/local data and matchContains than we must make sure * to loop through all the data collections looking for matches */ if( !options.url && options.matchContains ){ // track all matches var csub = []; // loop through all the data grids for matches for( var k in data ){ // don't search through the stMatchSets[""] (minChars: 0) cache // this prevents duplicates if( k.length > 0 ){ var c = data[k]; $.each(c, function(i, x) { // if we've got a match, add it to the array if (matchSubset(x.value, q)) { csub.push(x); } }); } } return csub; } else // if the exact item exists, use it if (data[q]){ return data[q]; } else if (options.matchSubset) { for (var i = q.length - 1; i >= options.minChars; i--) { var c = data[q.substr(0, i)]; if (c) { var csub = []; $.each(c, function(i, x) { if (matchSubset(x.value, q)) { csub[csub.length] = x; } }); return csub; } } } return null; } }; }; $.Autocompleter.Select = function (options, input, select, config) { var CLASSES = { ACTIVE: "ac_over" }; var listItems, active = -1, data, term = "", needsInit = true, element, list; // Create results function init() { if (!needsInit) return; element = $("<div/>") .hide() .addClass(options.resultsClass) .css("position", "absolute") .appendTo(document.body); list = $("<ul/>").appendTo(element).mouseover( function(event) { if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') { active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event)); $(target(event)).addClass(CLASSES.ACTIVE); } }).click(function(event) { $(target(event)).addClass(CLASSES.ACTIVE); select(); // TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus input.focus(); return false; }).mousedown(function() { config.mouseDownOnSelect = true; }).mouseup(function() { config.mouseDownOnSelect = false; }); if( options.width > 0 ) element.css("width", options.width); needsInit = false; } function target(event) { var element = event.target; while(element && element.tagName != "LI") element = element.parentNode; // more fun with IE, sometimes event.target is empty, just ignore it then if(!element) return []; return element; } function moveSelect(step) { listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE); movePosition(step); var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE); if(options.scroll) { var offset = 0; listItems.slice(0, active).each(function() { offset += this.offsetHeight; }); if((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) { list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight()); } else if(offset < list.scrollTop()) { list.scrollTop(offset); } } }; function movePosition(step) { active += step; if (active < 0) { active = listItems.size() - 1; } else if (active >= listItems.size()) { active = 0; } } function limitNumberOfItems(available) { return options.max && options.max < available ? options.max : available; } function fillList() { list.empty(); var max = limitNumberOfItems(data.length); for (var i=0; i < max; i++) { if (!data[i]) continue; var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term); if ( formatted === false ) continue; var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0]; $.data(li, "ac_data", data[i]); } listItems = list.find("li"); if ( options.selectFirst ) { listItems.slice(0, 1).addClass(CLASSES.ACTIVE); active = 0; } // apply bgiframe if available if ( $.fn.bgiframe ) list.bgiframe(); } return { display: function(d, q) { init(); data = d; term = q; fillList(); }, next: function() { moveSelect(1); }, prev: function() { moveSelect(-1); }, pageUp: function() { if (active != 0 && active - 8 < 0) { moveSelect( -active ); } else { moveSelect(-8); } }, pageDown: function() { if (active != listItems.size() - 1 && active + 8 > listItems.size()) { moveSelect( listItems.size() - 1 - active ); } else { moveSelect(8); } }, hide: function() { element && element.hide(); listItems && listItems.removeClass(CLASSES.ACTIVE); active = -1; }, visible : function() { return element && element.is(":visible"); }, current: function() { return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]); }, show: function() { var offset = $(input).offset(); element.css({ typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(), top: offset.top + input.offsetHeight, left: offset.left }).show(); if(options.scroll) { list.scrollTop(0); list.css({ maxHeight: options.scrollHeight, overflow: 'auto' }); if($.browser.msie && ((typeof document.body.style.maxHeight === "undefined") || (document.body.style.maxHeight == ''))) { //if($.browser.msie && ((typeof document.body.style.maxHeight === "undefined"))) { var listHeight = 0; listItems.each(function() { listHeight += this.offsetHeight; }); var scrollbarsVisible = listHeight > options.scrollHeight; list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight ); // if (!scrollbarsVisible) { // // IE doesn't recalculate width when scrollbar disappears // listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) ); // } } } }, selected: function() { var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE); return selected && selected.length && $.data(selected[0], "ac_data"); }, emptyList: function (){ list && list.empty(); }, unbind: function() { element && element.remove(); } }; }; $.Autocompleter.Selection = function(field, start, end) { if( field.createTextRange ){ var selRange = field.createTextRange(); selRange.collapse(true); selRange.moveStart("character", start); selRange.moveEnd("character", end); selRange.select(); } else if( field.setSelectionRange ){ field.setSelectionRange(start, end); } else { if( field.selectionStart ){ field.selectionStart = start; field.selectionEnd = end; } } field.focus(); }; })(jQuery);
简单实现在这里了，欢迎交流学习