使用 JavaScript 中的 XPath 查询获取节点的完整路径 [英] Get the full path of a node, after get it with an XPath query in JavaScript

问题描述

我有下一条指令，在 JavaScript 中:

i have the next instruction, in JavaScript:

var firstScene = document.evaluate('//Scene', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);

所以我的问题是如何获取节点firstscene的完整路径?

so my question is how to get the full path of the node firstscene?

推荐答案

使用这个 getXPath()功能:

  function getXPath(node, path) {
    path = path || [];
    if(node.parentNode) {
      path = getXPath(node.parentNode, path);
    }

    if(node.previousSibling) {
      var count = 1;
      var sibling = node.previousSibling
      do {
        if(sibling.nodeType == 1 && sibling.nodeName == node.nodeName) {count++;}
        sibling = sibling.previousSibling;
      } while(sibling);
      if(count == 1) {count = null;}
    } else if(node.nextSibling) {
      var sibling = node.nextSibling;
      do {
        if(sibling.nodeType == 1 && sibling.nodeName == node.nodeName) {
          var count = 1;
          sibling = null;
        } else {
          var count = null;
          sibling = sibling.previousSibling;
        }
      } while(sibling);
    }

    if(node.nodeType == 1) {
      path.push(node.nodeName.toLowerCase() + (node.id ? "[@id='"+node.id+"']" : count > 0 ? "["+count+"]" : ''));
    }
    return path;
  };

将从 firstScene.iterateNext() 获得的 DOM 对象传递给 getXPath() 方法，它将返回一个包含所有 XPATH 步骤的数组.

pass the DOM ojbect obtained from firstScene.iterateNext() to the getXPath() method and it will return an array with all of the XPATH steps.

然后您可以使用数组 join() 方法返回完整的 XPATH 表达式:

You can then use the array join() method to return a full XPATH expression:

getXPath(firstScene.iterateNext()).join("/");

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