Greasemonkey:XPath对.xhtml页面不返回任何结果 [英] Greasemonkey: XPath returns no results for .xhtml page

问题描述

在xhtml页面上运行时，xpath似乎不会返回任何结果.

When running on an xhtml page, xpath doesn't seem to return any results.

var result = document.evaluate( "//a/img", document.body, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null );

例如，返回空结果集.这是什么问题，我该如何解决?

For example returns an empty result set. What's the problem here, and how do I fix it?

推荐答案

xhtml元素不在空名称空间中，因此您必须传递

xhtml elements are not in null namespace, so you have to pass a namespace resolver to the method:

function resolver(prefix) {
    return prefix === 'x' ? 'http://www.w3.org/1999/xhtml' : null;
}
var result = document.evaluate( "//x:a/x:img", document.body, resolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null );

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