js输入框邮箱自动提示功能代码实现(2)

var self = this,
            _config = self.config,
            _cache = self.cache;

        $(_config.targetCls).each(function(index,item){

            $(item).keyup(function(e){
                var target = e.target,
                    targetVal = $.trim($(this).val()),
                    keycode = e.keyCode,
                    elemHeight = $(this).outerHeight(),
                    elemWidth = $(this).outerWidth(),
                    parentNode = $(this).closest(_config.parentCls);

                $(parentNode).css({'position':'relative'});
                // 如果输入框值为空的话 那么下拉框隐藏
                if(targetVal == '') {
                    $(item).attr({'data-html':''});
                    // 给隐藏域赋值
                    $(_config.hiddenCls,parentNode).val('');

_cache.currentIndex = -1;
                    _cache.oldIndex = -1;
                    $(".auto-tip",parentNode) && !$(".auto-tip",parentNode).hasClass('hidden') && $(".auto-tip",parentNode).addClass('hidden');
                    self._removeBg(parentNode);
                }else {

                    $(item).attr({'data-html':targetVal});

// 给隐藏域赋值
                    $(_config.hiddenCls,parentNode).val(targetVal);

                    $(".auto-tip",parentNode) && $(".auto-tip",parentNode).hasClass('hidden') && $(".auto-tip",parentNode).removeClass('hidden');
                    // 渲染下拉框内容
                    self._renderHTML({keycode:keycode,e:e,target:target,targetVal:targetVal,height:elemHeight,width:elemWidth,parentNode:parentNode});
                }

               
            });
        });

       // 阻止form表单默认enter键提交
       $(_config.searchForm).each(function(index,item) {
            $(item).keydown(function(e){
                 var keyCode = e.keyCode;
                 if(keyCode == 13) {
                     return false;
                 }
            });
       });