如何在 JSDOM 中使用 XPath 获取 XML 属性

Question

我似乎无法在此 XML 片段上使用 JSDOM 和 XPath 语法获取 XML 属性。

<PARAGRAPH>
    This is a text, about something, that happened on 
    <DATE ISO="20131117">17.November 2013</DATE>
    . It is a very important date.
</PARAGRAPH>

据我了解，PARAGRAPH/DATE/@ISO 是该属性的有效 XPath 语法，并且在 Xpather 等网站上运行良好

最小的工作示例：

import { JSDOM } from "jsdom";

const xml = `
<PARAGRAPH>
    This is a text, about something, that happened on 
    <DATE ISO="20131117">17.November 2013</DATE>
    . It is a very important date.
</PARAGRAPH>
`;

const dom = new JSDOM(xml, {contentType: "application/xml"});
const doc = dom.window.document;

// 2: XPathResult.STRING_TYPE
const date = doc.evaluate("PARAGRAPH/DATE/@ISO", doc, null, 2, null).stringValue;

console.log(date);

预期结果： "20131117"

实际结果： ""

其他无效的方法

PARAGRAPH//DATE/@ISO, string(PARAGRAPH/DATE/@ISO), XPath.FIRST_ORDERED_NODE_TYPE

评估结果似乎是空的。

Answer 1

用 camaro 试试这个。在此处使用 runkit 进行测试https://runkit.com/embed/vxenbgqb1g7x

var { transform } = require("camaro")

var xml = `
<PARAGRAPH>
    This is a text, about something, that happened on 
    <DATE ISO="20131117">17.November 2013</DATE>
    . It is a very important date.
</PARAGRAPH>
`;

async function main() {
    console.log(await transform(xml, {iso: 'PARAGRAPH/DATE/@ISO'}))
}

main()

输出

{iso: "20131117"}

Answer 2

不妨试试

const dateEl = doc.evaluate("PARAGRAPH/DATE", doc, null, 9, null).singleNodeValue;

const date = dateEl.getAttribute("ISO");