JS仿百度搜索自动提示框匹配查询功能

/**
 * JS 模糊查询
 * @author tugenhua
 * @date 2013-11-19
 * @param 1.当前的input add targetCls
 * 2. 隐藏域里面统一增加同类名 叫 hiddenCls
 * 3. 在各个父级元素上 添加类名 parentCls
 */

function AutoComplete (options) {
     this.config = {
        targetCls          : '.inputElem',          // 输入框目标元素
        parentCls          : '.parentCls',          // 父级类
        hiddenCls          : '.hiddenCls',          // 隐藏域input
        searchForm         :'.jqtransformdone',     //form表单
        hoverBg            : 'hoverBg',             // 鼠标移上去的背景
        outBg              : 'outBg',               // 鼠标移下拉的背景
        isSelectHide       : true,                 // 点击下拉框 是否隐藏
        url                : '',                    // url接口
        height             : 0,                     // 默认为0 不设置的话 那么高度自适应
        manySelect         : false,                 // 输入框是否多选 默认false 单选
        renderHTMLCallback : null,                  // keyup时 渲染数据后的回调函数
        callback           : null,                  // 点击某一项 提供回调
        closedCallback     : null                   // 点击输入框某一项x按钮时 回调函数
     };

this.cache = {
        currentIndex        : -1,
        oldIndex            : -1,
        inputArrs           : []                 // 多选时候 输入框值放到数组里面去
     };
     this.init(options);
 }

 AutoComplete.prototype = {

    constructor: AutoComplete,
    init: function(options) {

        this.config = $.extend(this.config, options || {});
        var self = this,
            _config = self.config,
            _cache = self.cache;

// 鼠标点击输入框时候
          $(_config.targetCls).each(function(index,item) {

              /*
               *  禁止 ctrl+v 和 黏贴事件
               */
              $(item).unbind('paste');
              $(item).bind('paste',function(e){
                  e.preventDefault();
                  var target = e.target,
                      targetParent = $(target).closest(_config.parentCls);
                  $(this).val('');
                  $(_config.hiddenCls,targetParent) && $(_config.hiddenCls,targetParent).val('');
              });

              $(item).keyup(function(e){
                  _cache.inputArrs = [];
                  var targetVal = $.trim($(this).val()),
                      keyCode = e.keyCode,
                      elemHeight = $(this).outerHeight(),
                      elemWidth = $(this).outerWidth();

                  // 如果输入框值为空的话 那么隐藏域的value清空掉
                  if(targetVal == '') {
                       var curParents = $(this).closest(_config.parentCls);
                       $(_config.hiddenCls,curParents).val('');
                  }
                  var targetParent = $(this).parent();
                  $(targetParent).css({'position':'relative'});

                  if($('.auto-tips',targetParent).length == 0) {
                      // 初始化时候 动态创建下拉框容器
                     $(targetParent).append($('<div></div>'));
                     $('.auto-tips',targetParent).css({'position':'absolute','top':elemHeight,'left':'0px','z-index':999,'width':elemWidth,'border':'1px solid #ccc'});
                  }

                 
                  var curIndex = self._keyCode(keyCode);
                  if(curIndex > -1){
                          self._keyUpAndDown(targetVal,e,targetParent);
                    }else {
                         if(targetVal != '') {
                            self._doPostAction(targetVal,targetParent);
                         }

                    }
              });

              // 失去焦点时 如果没有点击 或者上下移时候 直接输入 那么当前输入框值情况 隐藏域值情况
              $(item).blur(function(e){
                  var target = e.target,
                      targetParent = $(target).closest(_config.parentCls);
                  if($(this).attr('up') || $(this).attr('down')) {
                     return;
                  }else {
                     $(this).val('');
                     $(_config.hiddenCls,targetParent).val('');
                  }
              });

          });