XPath查找在PhantomJS中不起作用

时间:2013-10-25 12:34:01

标签: xpath phantomjs

我正在尝试让XPath使用PhantomJS 1.9.2:

var getElementsByXPath = function(xPath) {
  return document.evaluate(
    xPath, document, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
};
var root = getElementsByXPath("//div").iterateNext();

这是在页面加载时执行的,并且始终返回null,而querySelector似乎正常工作:

var divs = page.evaluate(function(s) {
  return document.querySelector(s);
}, 'div');

我在这个特定的XPath评估样本中是否遗漏了什么?

2 个答案:

答案 0 :(得分:13)

我终于发现调用document.evaluate必须包含一个page.evaluate调用,如下所示:

page.evaluate(function() {
    document.evaluate(
        '//div',
        document,
        null,
        XPathResult.ORDERED_NODE_ITERATOR_TYPE,
        null);
});

答案 1 :(得分:0)

如果你想用phantomjs获取特定xpath的html内容..: - )

var xpath= '//*[@id="2b"]';
var address= 'www.mywebadress.com';
page.open(address, function(status) {
      setTimeout(grabHtml, 2500);
    });

function grabHtml() {

var html = page.evaluate(function(xpath) {

    if (document.evaluate) { 
        var xPathRes = document.evaluate(xpath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null)
        if (xPathRes.singleNodeValue) {
            var c = html.singleNodeValue.innerHTML;
        } else if (xPathRes) {
            var c = "No content found!";
        }
    } else {
        var c = "does not support the evaluate method!";
    }
    return c;
}, xpath);

console.log(html);