jQuery Autocomplete自动完成插件

jQuery("#kw").suggest({
url:siteConfig.suggestionUrl,
params:{
kw:function(){return jQuery("#kw").val()},
n:10
}
});

(function($){
$.tools = $.tools || {version: '1.0'};
$.tools.suggest = {};
$.tools.suggest.defaults = {
url : null,
params : null,
delay : 100,
cache : true,
formId : '#search_form',
focus:null,
callback : true
}
$.tools.suggest.borderKey = {
UP: 38,
DOWN: 40,
TAB: 9,
ESC: 27,
ENTER:13
}

$.fn.suggest=function(options,fn){
var options,key = $.tools.suggest.borderKey;
if($.isFunction(options)){
fn=options;
options = $.extend({}, $.tools.suggest.defaults, key);
}else{
options = $.extend({}, $.tools.suggest.defaults, key, options);
}
return this.each(function(){
var
self = $(this),
url = options.url,
params = options.params,
searchUrl = null,
searchtimer = 0,
delay = options.delay,
cache = options.cache,
callback = options.callback,
formobj = $(options.formId),
focus = options.focus,
rebox = $('<ul/>').attr("id","suggest"),
htmlLi = null,
litop = null,
lileft = null,
liwth = null,
tip = false,
val = null,
rlen = null,
UP = options.UP,
DOWN = options.DOWN,
TAB = options.TAB,
ESC = options.ESC,
ENTER = options.ENTER,
index = -1,
choseKey = null,
backval = null,
hidden = false,
locksuggest = false


//init
if(focus){
self.focus();
searchtimer = setInterval(getKey, delay);
}
self.bind("focus",function(){
searchtimer = setInterval(getKey, delay);
// 触发焦点时初始化backval的值
backval = (backval=$.trim(self.val()))==''?null:backval;
})
.bind("blur",function(){
clearInterval(searchtimer);
searchtimer = 0;
hideResult();
})
.bind("keydown",function(e){
// 少于10项不使用switch
if(e.keyCode == UP){
clearInterval(searchtimer);
searchtimer = 0;
if($('#suggest').css('display') == 'none'){
reSet();
return false;
}
index--;
if(index<0){
index=Math.abs(rlen)-1;
}
changeSelect(index);
e.preventDefault();
return false;
}else if(e.keyCode == DOWN){
clearInterval(searchtimer);
searchtimer = 0;
if($('#suggest').css('display') == 'none'){
reSet();
return false;
}
index++;
if(index>=rlen){
index=0;
}
changeSelect(index);
e.preventDefault();
return false;
}else if(e.keyCode == TAB){
clearInterval(searchtimer);
searchtimer = 0;
hideResult();
}else if(e.keyCode == ESC){
clearInterval(searchtimer);
searchtimer = 0;
hideResult();
return false;
}else if(e.keyCode == ENTER){
clearInterval(searchtimer);
searchtimer = 0;
}else if(searchtimer == 0){
searchtimer = setInterval(getKey, delay);
}
});

// 获取关键词
function getKey(){
val = $.trim(self.val());
// 关键词不为空且关键词不重复
if(!!val && val!=backval){
backval = val;
// 如不需要缓存结果，设cache为false
if(cache && !!$.tools.suggest[val]){
index = -1;
rlen = $.tools.suggest[val][1];
appendSuggest($.tools.suggest[val][0]);
}else{
searchurl = url+'?'+$.param(params);
getResult(searchurl,function(htmltemp,htmllen){
index = -1;
rlen = htmllen;
appendSuggest(htmltemp);
});
}
}
// 关键词为空
if(!!!val && !hidden){
hideResult();
}
}

// 获取提示数据
function getResult(searchurl,fn){
if(callback){searchurl = searchurl+'&callback=?';}
$.getJSON(searchurl,function(data){
var htmltemp = '',
htmllen = 0,
inputWord = self.val()

$.each(data.list,function(i,n){
if(n.word != inputWord){
htmltemp += '<li>'+n.word+'</li>';
htmllen++;
}
});
if(cache && !!!$.tools.suggest[val]){$.tools.suggest[val]=[htmltemp,htmllen];}
fn.call(document,htmltemp,htmllen)
});
}

// 插入提示数据
function appendSuggest(result){
locksuggest = hidden = false;
if(!!result){
if(!tip){
litop = self.offset().top+self.outerHeight()-1;
lileft = self.offset().left;
liwth = self.outerWidth()-2;
rebox.css({'position':'absolute','top':litop,'left':lileft,'width':liwth}).html(result).appendTo('body').show();
tip = true;
}else{
rebox.html(result).show();
}
rebox.find('li').bind('mouseover',function(){
// 锁定提示层，保证不因冒泡关闭提示层
locksuggest = true;
index = $(this).index();
changeSelect(index,false);
})
.bind('click',function(){
changeSelect(index);
searchSubmit();
});
rebox.bind('mouseout',function(){
locksuggest = false;
})
}else{
// 如果检索结果为空，清空提示层
rebox.hide();
}
}

function changeSelect(index,v){
v=v==false?false:true;
var obj = rebox.find('li').eq(index);
rebox.find('li.mo').removeClass('mo');
obj.addClass("mo");
if(v){
choseKey = backval = obj.html();
self.val(choseKey);
}
}

function reSet(){
if(!!self.val()){
index = -1;
$('#suggest').css('display','block');
rebox.find('li.mo').removeClass('mo');
// 根据html结构重新计算提示结果长度
rlen = rebox.find('li').size();
}
}

function hideResult(){
if(!locksuggest){
choseKey = backval = null;
hidden = true;
rebox.hide();
}
}

function searchSubmit(){
self.val(choseKey);
hideResult();
clearInterval(searchtimer);
formobj.submit();
}

});
}
})(jQuery);