Edge和IE11 XSLT空间问题

Question

我在Edge和IE11中遇到了一个问题，使用XSLT将HTML转换为XML。当转换时，只有Edge和IE11中的元素在转换后会变成一个空的或自我关闭的元素，而Chrome和Firefox则会保留空格。这是真实的从XML到HTML和HTML到XML的问题，我已经创建了一个Codepen的例子，从HTML到XML，这是一个超精简版的代码，以最小的噪音来展示我使用的过程。https:/codepen.ioakealeypenYzyEmpz）。

在Chrome和Edge中运行钢笔，结果会显示Edge删除了空格。有什么方法可以保留这些空格吗？我已经通过各种不同的属性和设置来做到这一点，但没有任何效果。被转换的标记存在于一个网页上(网页我有完全的控制权，文档我没有)。

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来说，我认为你需要设置为 preserveWhiteSpace 到 true 前，在任何DOMDocument上使用 load 或 loadXML，因为该属性的默认值为false(https:/docs.microsoft.comen-usprevious-versionswindowsdesktopms761353(v%3Dvs.85)).

对于Edge来说，设置 <div xml:space="preserve"> </div>.

Answer 2

你的codepen在IE中出现了错误。transformNode 在IE中未定义。你需要使用 new ActiveXObject('Msxml2.DOMDocument.6.0') 和 loadXML 而不是IE中的 DOMParser 来解析XML。对于Edge，我赞成Martin的答案。应用 xml:space="preserve" 那么它也将适用于所有的子代元素。

最后的代码示例是这样的，它可以在IE和Edge中很好地工作(请注意 //IE11 代码中的部分）。)

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>