搜bigAutocomplete索下拉自动补全插件，Ajax+Thinkphp后台取数据的用法。

一、首先我先说一下，网上有很多案例，不过我试了很多，都是有一些问题的。

  比如：大小写区分、按键盘上下键跳行等问题，下面是我简化和修复了的作品。

二、本地静态数据案例(网上案例很多这个不多说)

<script type="text/javascript" src="/js/jquery.bigautocomplete.js"></script>
<form action="#" method="post" name="searchform" id="searchform" class="searchinfo">
<input type="text" id="searchid" value="" class="searchid" />
<input type="submit" value="搜索" class="button" />
</form>
<script type="text/javascript">
$("#searchid").bigAutocomplete({

width:543,
data:[{title:"abcde",result:{ff:"6666"}},//这个result是返回值
{title:"abcde"},
{title:"abcde"},
{title:"dea"},
{title:"abcde"},
{title:"abcde"},
{title:"bdae"},
{title:"bcde"},
{title:"bde"},
{title:"bcde"}],
callback:function(data){
alert(data.title);
}
})

<input type="text"  value=""  id="searchID" placeholder="输入产品型号">

<script type="text/javascript">
        $("#searchID").bigAutocomplete({
           data:[{"model":"number"}],//这里是随便写的，不为空就行。
           callback:function(data){}
         })
</script>

public function searchlist(){
$key=$_POST['qkskey'];
$M=M();
$sql="这里是数据库查询语句不多说";
$data = $M->query($sql);
$this->ajaxReturn($data);
}

if(data != null && $.isArray(data) ){
var data_ = new Array();
$.ajax({
type: "POST",
async:false,
contentType: "application/x-www-form-urlencoded; charset=utf-8",
url: "?s=/Home/Info/searchlist",
data: {"qkskey":$("#searchID").val()},
dataType: "json",
success:function(data){
for(var i=0;i<data.length;i++){

if(data[i].model.indexOf(keyword_) > -1){

data_.push(data[i]);

}
}
}
})

// JavaScript Document
(function($){
var bigAutocomplete = new function(){
currentInputText = null;//目前获得光标的输入框（解决一个页面多个输入框绑定自动补全功能）
this.functionalKeyArray = [9,20,13,16,17,18,91,92,93,45,36,33,34,35,37,39,112,113,114,115,116,117,118,119,120,121,122,123,
144,19,145,40,38,27];//键盘上功能键键值数组
this.holdText = null;//输入框中原始输入的内容

//初始化插入自动补全div，并在document注册mousedown，点击非div区域隐藏div
this.init = function(){
$("body").append("<div id='bigAutocompleteContent' class='bigautocomplete-layout'></div>");
$(document).bind('mousedown',function(event){
var $target = $(event.target);
if((!($target.parents().andSelf().is('#bigAutocompleteContent'))) && (!$target.is($(currentInputText)))){
bigAutocomplete.hideAutocomplete();
}
})

//鼠标悬停时选中当前行
$("#bigAutocompleteContent").delegate("tr", "mouseover", function() {
$("#bigAutocompleteContent tr").removeClass("ct");
$(this).addClass("ct");
}).delegate("tr", "mouseout", function() {
$("#bigAutocompleteContent tr").removeClass("ct");
});

//单击选中行后，选中行内容设置到输入框中，并执行callback函数
$("#bigAutocompleteContent").delegate("tr", "click", function() {
$(currentInputText).val( $(this).find("div:last").html());
var callback_ = $(currentInputText).data("config").callback;
if($("#bigAutocompleteContent").css("display") != "none" && callback_ && $.isFunction(callback_)){
callback_($(this).data("jsonData"));

}
bigAutocomplete.hideAutocomplete();
})

}

this.autocomplete = function(param){

if($("body").length > 0 && $("#bigAutocompleteContent").length <= 0){
bigAutocomplete.init();//初始化信息

}

var $this = this;//为绑定自动补全功能的输入框jquery对象

var $bigAutocompleteContent = $("#bigAutocompleteContent");

this.config = {
//width:下拉框的宽度，默认使用输入框宽度
width:0,
//url：格式url:""用来ajax后台获取数据，返回的数据格式为data参数一样
url:null,
/*data：格式{data:[{model:null,result:{}},{model:null,result:{}}]}
url和data参数只有一个生效，data优先*/
data:null,
//callback：选中行后按回车或单击时回调的函数
callback:null};
$.extend(this.config,param);

$this.data("config",this.config);

//输入框keydown事件
$this.keydown(function(event) {
var node = event.currentTarget;
switch (event.keyCode) {
case 40://向下键

if($bigAutocompleteContent.css("display") == "none")return;

//alert($bigAutocompleteContent);
var $nextSiblingTr = $bigAutocompleteContent.find(".ct");
//var $nextSiblingTr = $('bigAutocompleteContent').find(".ct")
if($nextSiblingTr.length <= 0){//没有选中行时，选中第一行
$nextSiblingTr = $bigAutocompleteContent.find("tr:first");

}else{

$nextSiblingTr = $nextSiblingTr.next();
}
$bigAutocompleteContent.find("tr").removeClass("ct");

if($nextSiblingTr.length > 0){//有下一行时（不是最后一行）
$nextSiblingTr.addClass("ct");//选中的行加背景
$(node).val($nextSiblingTr.find("div:last").html());//选中行内容设置到输入框中

//div滚动到选中的行,jquery-1.6.1 $nextSiblingTr.offset().top 有bug，数值有问题
//$bigAutocompleteContent.scrollTop($nextSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $nextSiblingTr.height() );

}else{
$(node).val(bigAutocomplete.holdText);//输入框显示用户原始输入的值
}

break;
case 38://向上键
if($bigAutocompleteContent.css("display") == "none")return;

var $previousSiblingTr = $bigAutocompleteContent.find(".ct");
if($previousSiblingTr.length <= 0){//没有选中行时，选中最后一行行
$previousSiblingTr = $bigAutocompleteContent.find("tr:last");
}else{
$previousSiblingTr = $previousSiblingTr.prev();
}
$bigAutocompleteContent.find("tr").removeClass("ct");

if($previousSiblingTr.length > 0){//有上一行时（不是第一行）
$previousSiblingTr.addClass("ct");//选中的行加背景
$(node).val($previousSiblingTr.find("div:last").html());//选中行内容设置到输入框中

//div滚动到选中的行,jquery-1.6.1 $$previousSiblingTr.offset().top 有bug，数值有问题
$bigAutocompleteContent.scrollTop($previousSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $previousSiblingTr.height());
}else{
$(node).val(bigAutocomplete.holdText);//输入框显示用户原始输入的值
}

break;
case 27://ESC键隐藏下拉框

bigAutocomplete.hideAutocomplete();
break;
}
});

//输入框keyup事件
$this.keyup(function(event) {
var k = event.keyCode;
var node = event.currentTarget;
var ctrl = event.ctrlKey;
var isFunctionalKey = false;//按下的键是否是功能键
for(var i=0;i<bigAutocomplete.functionalKeyArray.length;i++){
if(k == bigAutocomplete.functionalKeyArray[i]){
isFunctionalKey = true;
break;
}
}
//k键值不是功能键或是ctrl+c、ctrl+x时才触发自动补全功能
if(!isFunctionalKey && (!ctrl || (ctrl && k == 67) || (ctrl && k == 88)) ){

acf2
var config = $(node).data("config");

var offset = $(node).offset();
if(config.width <=0){
config.width  = $(node).outerWidth() - 2
}
$bigAutocompleteContent.width(config.width);
var h = $(node).outerHeight() - 1;
$bigAutocompleteContent.css({"top":offset.top + h,"left":offset.left});

var data = config.data;
var url = config.url;
var keyword_ = $.trim($(node).val().toUpperCase());
if(keyword_ == null || keyword_ == ""){
bigAutocomplete.hideAutocomplete();
return;
}
if(data != null && $.isArray(data) ){
var data_ = new Array();
$.ajax({
type: "POST",
async:false,
contentType: "application/x-www-form-urlencoded; charset=utf-8",
url: "?s=/Home/Info/searchlist",
data: {"qkskey":$("#searchID").val()},
dataType: "json",
success:function(data){
for(var i=0;i<data.length;i++){

if(data[i].model.indexOf(keyword_) > -1){

data_.push(data[i]);

}
}
}
})
makeContAndShow(data_);
}else if(url != null && url != ""){//ajax请求数据
$.post(url,{keyword:keyword_},function(result){
makeContAndShow(result.data)
},"json")

}

bigAutocomplete.holdText = $(node).val();
}
//回车键
if(k == 13){
var callback_ = $(node).data("config").callback;
if($bigAutocompleteContent.css("display") != "none"){
if(callback_ && $.isFunction(callback_)){
callback_($bigAutocompleteContent.find(".ct").data("jsonData"));
}
$bigAutocompleteContent.hide();
}
}

});

//组装下拉框html内容并显示
function makeContAndShow(data_){
if(data_ == null || data_.length <=0 ){
return;
}

var cont = "<table><tbody>";
for(var i=0;i<data_.length;i++){
cont += "<tr id="+i+"><td><div>" + data_[i].model + "</div></td><td width='25%' class='bignumber'>约有"+data_[i].number+"个商品</td></tr>"
}
cont += "</tbody></table>";
$bigAutocompleteContent.html(cont);
$bigAutocompleteContent.show();

//每行tr绑定数据，返回给回调函数
$bigAutocompleteContent.find("tr").each(function(index){
$(this).data("jsonData",data_[index]);
})
}

//输入框focus事件
$this.focus(function(event){
currentInputText = event.currentTarget;
});

}
//隐藏下拉框
this.hideAutocomplete = function(){
var $bigAutocompleteContent = $("#bigAutocompleteContent");
if($bigAutocompleteContent.css("display") != "none"){
$bigAutocompleteContent.find("tr").removeClass("ct");
$bigAutocompleteContent.hide();
}
}

};

$.fn.bigAutocomplete = bigAutocomplete.autocomplete;

})(jQuery)

.bigautocomplete-layout{display:none;background-color:#FFFFFF;border:1px solid #BCBCBC;position:absolute;z-index:10000;
overflow-x:hidden;overflow-y:auto; }
.bigautocomplete-layout table{border-collapse:collapse;border-spacing:0;background:none repeat scroll 0 0 #FFFFFF;width:100%;cursor:default;}
.bigautocomplete-layout table tr{background:none repeat scroll 0 0 #FFFFFF; height:30px;}
.bigautocomplete-layout .ct{background:none repeat scroll 0 0 #1e8efc !important; color:#FFF;}
.bigautocomplete-layout div{word-wrap:break-word;word-break:break-all;padding:1px 5px;}
.bignumber{ color:#A1A1A1; }
.bigautocomplete-layout .ct .bignumber{ color:#fff;}