js 公式编辑器 - 自定义匹配规则 - 带提示下拉框(6)

　// 切换当前项
  _this.dropdown.on('mouseenter','li',function(){
   $(this).addClass("active").siblings().removeClass("active");
  });

 // 点击当前项获取文本值 重组输入框 value值 失去焦点时隐藏下拉框 清空下拉框
  $(document).click(function(e){
   var e = event || window.event;
   var el = e.target.localName; // 获取事件源 标签名
   el == "li" ? changeValue() : endSearch();
   //console.log(el);
  })

/*********以下为获取下拉框像素坐标方法*********/ 
  var kingwolfofsky = { 
   getInputPositon: function (elem) { 
   if (document.selection) { //IE Support 
    elem.focus(); 
    var Sel = document.selection.createRange(); 
    return { 
    left: Sel.boundingLeft, 
    top: Sel.boundingTop, 
    bottom: Sel.boundingTop + Sel.boundingHeight 
    }; 
   } else { 
    var that = this; 
    var cloneDiv = '{$clone_div}', cloneLeft = '{$cloneLeft}', cloneFocus = '{$cloneFocus}', cloneRight = '{$cloneRight}'; 
    var none = '<span style="white-space:pre-wrap;"> </span>'; 
    var div = elem[cloneDiv] || document.createElement('div'), focus = elem[cloneFocus] || document.createElement('span'); 
    var text = elem[cloneLeft] || document.createElement('span'); 
    var offset = that._offset(elem), index = this._getFocus(elem), focusOffset = { left: 0, top: 0 }; 
   
    if (!elem[cloneDiv]) { 
    elem[cloneDiv] = div, elem[cloneFocus] = focus; 
    elem[cloneLeft] = text; 
    div.appendChild(text); 
    div.appendChild(focus); 
    document.body.appendChild(div); 
    focus.innerHTML = '|'; 
    focus.style.cssText = 'display:inline-block;width:0px;overflow:hidden;z-index:-100;word-wrap:break-word;word-break:break-all;'; 
    div.className = this._cloneStyle(elem); 
    div.style.cssText = 'visibility:hidden;display:inline-block;position:absolute;z-index:-100;word-wrap:break-word;word-break:break-all;overflow:hidden;'; 
    }; 
    div.style.left = this._offset(elem).left + "px"; 
    div.style.top = this._offset(elem).top + "px"; 
    var strTmp = elem.value.substring(0, index).replace(/</g, '<').replace(/>/g, '>').replace(/\n/g, '<br/>').replace(/\s/g, none); 
    text.innerHTML = strTmp; 
   
    focus.style.display = 'inline-block'; 
    try { focusOffset = this._offset(focus); } catch (e) { }; 
    focus.style.display = 'none'; 
    return { 
    left: focusOffset.left, 
    top: focusOffset.top, 
    bottom: focusOffset.bottom 
    }; 
   } 
   },
   // 克隆元素样式并返回类 
   _cloneStyle: function (elem, cache) { 
   if (!cache && elem['${cloneName}']) return elem['${cloneName}']; 
   var className, name, rstyle = /^(number|string)$/; 
   var rname = /^(content|outline|outlineWidth)$/; //Opera: content; IE8:outline && outlineWidth 
   var cssText = [], sStyle = elem.style; 
   
   for (name in sStyle) { 
    if (!rname.test(name)) { 
    val = this._getStyle(elem, name); 
    if (val !== '' && rstyle.test(typeof val)) { // Firefox 4 
     name = name.replace(/([A-Z])/g, "-$1").toLowerCase(); 
     cssText.push(name); 
     cssText.push(':'); 
     cssText.push(val); 
     cssText.push(';'); 
    }; 
    }; 
   }; 
   cssText = cssText.join(''); 
   elem['${cloneName}'] = className = 'clone' + (new Date).getTime(); 
   this._addHeadStyle('.' + className + '{' + cssText + '}'); 
   return className; 
   }, 
   
   // 向页头插入样式 
   _addHeadStyle: function (content) { 
   var style = this._style[document]; 
   if (!style) { 
    style = this._style[document] = document.createElement('style'); 
    document.getElementsByTagName('head')[0].appendChild(style); 
   }; 
   style.styleSheet && (style.styleSheet.cssText += content) || style.appendChild(document.createTextNode(content)); 
   }, 
   _style: {}, 
   
   // 获取最终样式 
   _getStyle: 'getComputedStyle' in window ? function (elem, name) { 
   return getComputedStyle(elem, null)[name]; 
   } : function (elem, name) { 
   return elem.currentStyle[name]; 
   }, 
   // 获取光标在文本框的位置 
   _getFocus: function (elem) { 
   var index = 0; 
   if (document.selection) {// IE Support 
    elem.focus(); 
    var Sel = document.selection.createRange(); 
    if (elem.nodeName === 'TEXTAREA') {//textarea 
    var Sel2 = Sel.duplicate(); 
    Sel2.moveToElementText(elem); 
    var index = -1; 
    while (Sel2.inRange(Sel)) { 
     Sel2.moveStart('character'); 
     index++; 
    }; 
    } 
    else if (elem.nodeName === 'INPUT') {// input 
    Sel.moveStart('character', -elem.value.length); 
    index = Sel.text.length; 
    } 
   } 
   else if (elem.selectionStart || elem.selectionStart == '0') { // Firefox support 
    index = elem.selectionStart; 
   } 
   return (index); 
   }, 
   
   // 获取元素在页面中位置 
   _offset: function (elem) { 
   var box = elem.getBoundingClientRect(), doc = elem.ownerDocument, body = doc.body, docElem = doc.documentElement; 
   var clientTop = docElem.clientTop || body.clientTop || 0, clientLeft = docElem.clientLeft || body.clientLeft || 0; 
   var top = box.top + (self.pageYOffset || docElem.scrollTop) - clientTop, left = box.left + (self.pageXOffset || docElem.scrollLeft) - clientLeft; 
   return { 
    left: left, 
    top: top, 
    right: left + box.width, 
    bottom: top + box.height 
   }; 
   } 
  };