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jQuery Autocomplete自动完成插件_jquery

WBOY
WBOY原創
2016-05-16 18:22:471049瀏覽

相对于同类插件,他的特色有3点。
1、可缓存查询结果 (二次查询速度快)
2、非keyup监听方式 (解决某些系统/情况下无法触发keyxxx事件的问题)
3、简洁的参数 (好看?)

插件性能尚好,我的E6500、2G内存,30秒内一共发生了4469次调用,耗时94.65毫秒;百度的是2432次调用,80.24毫秒。

接近1倍的调用是jQuery中的问题,但具体原因我还没弄明白,如果那位兄弟知道的还请不吝赐教。

调用方法

复制代码 代码如下:

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

参数url:baseUrl,例如http://www.target.com/search.php
参数params:url的后缀列表,范例中拼合的url为:http://www.target.com/search.php?kw=xxx&n=10&callback=?(默认加入callback)
参数delay:输入间隔时间,主要是为了降低负载,数值越大,负载越低,查询速度越慢。
参数cache:是否实用缓存,默认为true,例如当搜索“test”时,程序会将对应的查询结果缓存,当第二次搜索test时直接从缓存中读取。
参数formId:必须填写,form表单的id
参数callback:是否使用jsonp以便处理跨域问题。
核心代码:
suggest.js
复制代码 代码如下:

(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 = $('
    ').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(indexindex=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()

    $.each(data.list,function(i,n){
    if(n.word != inputWord){
    htmltemp += '
  • '+n.word+'
  • ';
    htmllen++;
    }
    });
    if(cache && !!!$.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);

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