Edge 和 IE11 XSLT 空间问题

Question

我遇到了 Edge 和 IE11 使用 XSLT 将 HTML 转换为 XML 的问题。
转换时，仅包含空格（一个或多个）的元素在 Edge 和 IE11 中转换后变成空元素或自闭合元素； Chrome 和 Firefox 保留空格。从 XML 到 HTML 和从 HTML 到 XML 确实如此
我创建了一个从 HTML 到 XML 的问题的 Codepen 示例，它是代码的超精简版本，以最小的噪音演示我正在使用的过程是什么。
https://codepen.io/akealey/pen/YzyEmpz

在 Chrome 和 Edge 中运行笔，结果将显示 Edge 删除空间。
有什么办法可以保留空间吗？我已经经历了各种不同的属性和设置来做到这一点，但没有任何效果。
正在转换的标记存在于网页上（我可以完全控制的网页，我不能控制的文档）。

var outStr, processor, implementationObject, transformedDocument;
// a trimmed down document all the way to the element in question
var xmlStr = '<div> </div>';
// an alternate bare bones xslt. also does not generate a space in the output
var xsltStr = '<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">\n<xsl:output method="xml" encoding="utf-8" indent="no"/>\n<xsl:template match="/">\n<xsl:copy-of select="*" />\n</xsl:template></xsl:stylesheet>';

// create the dom parser
var domParser = new DOMParser();
// parse both xml and xslt into actual dom objects. Note xml has the xml header prepended
var xmlDoc = domParser.parseFromString('<?xml version="1.0" ?>' + xmlStr, 'text/xml');
var xsltDoc = domParser.parseFromString(xsltStr, 'text/xml');

// test what xslt processors are available. if chrome, firefox, edge - else ie11
if (typeof XSLTProcessor !== "undefined" && XSLTProcessor !== null) {
  // Chrome
  // Edge
  // Firefox
  processor = new XSLTProcessor();
  processor.importStylesheet(xsltDoc);
  //edge has the space inside xmlDoc up to this point
  transformedDocument = processor.transformToFragment(xmlDoc, document);
  // inspecting the tansformed document in Edge shows the element has no space but chrome and firefox does
} else if ('transformNode' in xmlDoc) {
  // IE11
  transformedDocument = xmlDoc.transformNode(xsltDoc);
} else {
  console.log('no transform engine found');
}

// turn the converted xml document into a string
var xmlSerializer = new XMLSerializer();
var transformResult = xmlSerializer.serializeToString(transformedDocument);
console.log(transformResult);
// In Edge .serializeToString() turns the element in to a self closing tag (as there is no content)

var hasSpace = /> <\//.test(transformResult);
console.log(hasSpace);

Answer 1

对于直接使用 MSXML 的 IE，我认为在使用 load 或 loadXML 之前，您需要在任何 DOMDocument 上将 preserveWhiteSpace 设置为 true，因为该属性的默认值为 false (https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms761353(v%3Dvs.85))。

对于 Edge，设置 <div xml:space="preserve"> </div> 可能会有所帮助。

Answer 2

您的 codepen 在 IE 中有错误。 transformNode 在 IE 中未定义。您需要在 IE 中使用 new ActiveXObject('Msxml2.DOMDocument.6.0') 和 loadXML 而不是 DOMParser 来解析 XML。对于 Edge，我赞成 Martin 的回答：在根元素上应用 xml:space="preserve"，然后它也将应用到所有后代。

最终的代码样例是这样的，它可以在IE和Edge中运行良好（注意代码中的//IE11部分）：

function textOrConsole(text, elementSelector) {
  var processorElement = document.querySelector(elementSelector);
  if (processorElement)
    processorElement.innerText = text;
  else
    console.log(text);
}

var outStr, processor, implementationObject, transformedDocument, transformResult;
// a trimmed down document all the way to the element in question
var xmlStr = '<div xml:space="preserve"><div> </div></div>';
// an alternate bare bones xslt. also does not generate a space in the output
var xsltStr = '<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">\n<xsl:output method="xml" encoding="utf-8" indent="no"/>\n<xsl:template match="/">\n<xsl:copy-of select="*" />\n</xsl:template></xsl:stylesheet>';

// create the dom parser
var domParser = new DOMParser();
// parse both xml and xslt into actual dom objects. Note xml has the xml header prepended
var xmlDoc = domParser.parseFromString('<?xml version="1.0" ?>' + xmlStr, 'text/xml');
var xsltDoc = domParser.parseFromString(xsltStr, 'text/xml');

// test what xslt processors are available. if chrome, firefox, edge - else ie11
if (typeof XSLTProcessor !== "undefined" && XSLTProcessor !== null) {
  // Chrome
  // Edge
  // Firefox
  textOrConsole('XSLTProcessor (transformToFragment)', '#transform');
  processor = new XSLTProcessor();
  processor.importStylesheet(xsltDoc);
  //edge has the space inside xmlDoc up to this point
  transformedDocument = processor.transformToFragment(xmlDoc, document);
  // inspecting the tansformed document in Edge shows the element has no space but chrome and firefox does
} else if (!!window.ActiveXObject || "ActiveXObject" in window) {
  // IE11
  var docxml = new ActiveXObject('Msxml2.DOMDocument.6.0');
  docxml.loadXML(xmlStr);

  var docxsl = new ActiveXObject('Msxml2.DOMDocument.6.0');
  docxsl.loadXML(xsltStr);

  transformedDocument = docxml.transformNode(docxsl);
  textOrConsole('xmlDoc.transformNode', '#transform');
} else {
  console.log('no transform engine found');
}

// turn the converted xml document into a string
var xmlSerializer = new XMLSerializer();
if (!!window.ActiveXObject || "ActiveXObject" in window) {
  // IE11
  transformResult = transformedDocument;
} else {
  transformResult = xmlSerializer.serializeToString(transformedDocument);
}
// In Edge .serializeToString() turns the element int oa self closing tag (as there is no content)

var hasSpace = /> <\//.test(transformResult);
textOrConsole("Transformed element: " + transformResult, '#text');
textOrConsole("Has space: " + hasSpace, '#hasSpace');

<h3>Result</h3>
<span>Transform used: </span><span id="transform"></span>
<div id="text"></div>
<div id="hasSpace"></div>
</body>