日期:2014-5-17 浏览次数:20085次

获取元素的xpath, 转换xpath为csspath进行jQuery元素获取
var $shadow = new Object();
	/**
        获取元素的xpath
        特性:
        - 转换xpath为csspath进行jQuery元素获取
        - 仅生成自然表述路径(不支持非、或)
        @param dom {String/Dom} 目标元素
        @returns {String} dom的xpath路径
	*/
	$shadow.domXpath = function(dom) {
	  dom = $(dom).get(0);
	  var path = "";
	  for (; dom && dom.nodeType == 1; dom = dom.parentNode) {
	    var index = 1;
	    for (var sib = dom.previousSibling; sib; sib = sib.previousSibling) {
	      if (sib.nodeType == 1 && sib.tagName == dom.tagName)
	        index++;
	      }
	    var xname =  dom.tagName.toLowerCase();
	    if (dom.id) {
	      xname += "[@id=\"" + dom.id + "\"]";
	    } else {
	      if (index > 0)
	        xname += "[" + index + "]";
	    }
	    path = "/" + xname + path;
	  }
	  
	  path = path.replace("html[1]/body[1]/","html/body/");
	  
	        return path;
	};


/**
	        根据xpath获取元素
	        特性:
	        - 转换xpath为csspath进行jQuery元素获取
	        - 仅支持自然表述(不支持非、或元素选取)
	        @param xpath {String} 目标元素xpath
	        @returns {jQuery Object} 元素/元素集合
	*/
	$shadow.xpathDom = function(xpath){
	  		// 开始转换 xpath 为 css path
	        // 转换 // 为 " "
	        xpath = xpath.replace(/\/\//g, " ");
	        // 转换 / 为 >
	        xpath = xpath.replace(/\//g, ">");
	        // 转换 [elem] 为 :eq(elem) : 规则 -1
	        xpath = xpath.replace(/\[([^@].*?)\]/ig, function(matchStr,xPathIndex){
	                var cssPathIndex = parseInt(xPathIndex)-1;
	                return ":eq(" + cssPathIndex + ")";
	        });
	        // 1.2 版本后需要删除@
	        xpath = xpath.replace(/\@/g, "");
		  // 去掉第一个 >
		  xpath = xpath.substr(1);
		  alert(xpath);
		        // 返回jQuery元素
		  return $(xpath);
	};