Summary of JS operation XML examples (loading and parsing XML files and strings)

Summary of JS operation XML examples (loading and parsing XML files and strings)_javascript skills

WBOY

Release： 2016-05-16 15:27:05

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The examples in this article describe how JS operates XML. Share it with everyone for your reference, the details are as follows:

My xml file Login.xml is as follows.

<&#63;xml version="1.0" encoding="utf-8" &#63;>
<Login>
 <Character>
 <C Text="热血" Value="0"></C>
 <C Text="弱气" Value="1"></C>
 <C Text="激情" Value="2"></C>
 <C Text="冷静" Value="3"></C>
 <C Text="冷酷" Value="4"></C>
 </Character>
 <Weapon>
 <W Text="光束剑" Value="0"></W>
 <W Text="光束配刀" Value="1"></W>
 </Weapon>
 <EconomyProperty>
 <P Text="平均型" Value="0"></P>
 <P Text="重视攻击" Value="1"></P>
 <P Text="重视敏捷" Value="2"></P>
 <P Text="重视防御" Value="3"></P>
 <P Text="重视命中" Value="4"></P>
 </EconomyProperty>
</Login>

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Now I need to operate on the content of this xml file.

First, we need to load this xml file. Loading the xml file in js is done through XMLDOM.

// 加载xml文档
loadXML = function(xmlFile)
{
 var xmlDoc;
 if(window.ActiveXObject)
 {
 xmlDoc = new ActiveXObject('Microsoft.XMLDOM');
 xmlDoc.async = false;
 xmlDoc.load(xmlFile);
 }
 else if (document.implementation&&document.implementation.createDocument)
 {
 xmlDoc = document.implementation.createDocument('', '', null);
 xmlDoc.load(xmlFile);
 }
 else
 {
 return null;
 }
 return xmlDoc;
}

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The xml file object comes out, and I will operate on this document next.

For example, if we now need to get the attributes of the first node of the node Login/Weapon/W, then we can proceed as follows.

// 首先对xml对象进行判断
checkXMLDocObj = function(xmlFile)
{
 var xmlDoc = loadXML(xmlFile);
 if(xmlDoc==null)
 {
 alert('您的浏览器不支持xml文件读取,于是本页面禁止您的操作,推荐使用IE5.0以上可以解决此问题!');
 window.location.href='/Index.aspx';
 }
 return xmlDoc;
}
// 然后开始获取需要的Login/Weapon/W的第一个节点的属性值
var xmlDoc = checkXMLDocObj('/EBS/XML/Login.xml');
var v = xmlDoc.getElementsByTagName('Login/Weapon/W')[0].childNodes.getAttribute('Text')

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The way I write in my program is like this. Of course, the way I write in the program has been applied in practice. It is also given for viewing

initializeSelect = function(oid, xPath)
{
 var xmlDoc = checkXMLDocObj('/EBS/XML/Login.xml');
 var n;
 var l;
 var e = $(oid);
 if(e!=null)
 {
 n = xmlDoc.getElementsByTagName(xPath)[0].childNodes;
 l = n.length;
 for(var i=0; i<l; i++)
 {
  var option = document.createElement('option');
  option.value = n[i].getAttribute('Value');
  option.innerHTML = n[i].getAttribute('Text');
  e.appendChild(option);
 }
 }
}

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In the above access code, we use xmlDoc.getElementsByTagName(xPath).
It can also be accessed through xmlDoc.documentElement.childNodes(1)..childNodes(0).getAttribute('Text').

Some common methods:

xmlDoc.documentElement.childNodes(0).nodeName, you can get the name of this node.
xmlDoc.documentElement.childNodes(0).nodeValue, you can get the value of this node. This value comes from the xml format like this: b, so you can get the value of b.
xmlDoc.documentElement.childNodes(0).hasChild, you can determine whether there are child nodes
According to my experience, it is best to use the getElementsByTagName(xPath) method to access the node, because this way the node can be located directly through xPath, which will have better performance .

Supplement:

JS parsing XML file

<script type='text/javascript'>
 loadXML = function(xmlFile){
 var xmlDoc=null;
 //判断浏览器的类型
 //支持IE浏览器
 if(!window.DOMParser && window.ActiveXObject){
  var xmlDomVersions = ['MSXML.2.DOMDocument.6.0','MSXML.2.DOMDocument.3.0','Microsoft.XMLDOM'];
  for(var i=0;i<xmlDomVersions.length;i++){
  try{
   xmlDoc = new ActiveXObject(xmlDomVersions[i]);
   break;
  }catch(e){
  }
  }
 }
 //支持Mozilla浏览器
 else if(document.implementation && document.implementation.createDocument){
  try{
  /* document.implementation.createDocument('','',null); 方法的三个参数说明
   * 第一个参数是包含文档所使用的命名空间URI的字符串； 
   * 第二个参数是包含文档根元素名称的字符串； 
   * 第三个参数是要创建的文档类型（也称为doctype）
   */
  xmlDoc = document.implementation.createDocument('','',null);
  }catch(e){
  }
 }
 else{
  return null;
 }
 if(xmlDoc!=null){
  xmlDoc.async = false;
  xmlDoc.load(xmlFile);
 }
 return xmlDoc;
 }
</script>

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JS parsing XML string

<script type='text/javascript'>
 loadXML = function(xmlString){
 var xmlDoc=null;
 //判断浏览器的类型
 //支持IE浏览器 
 if(!window.DOMParser && window.ActiveXObject){ //window.DOMParser 判断是否是非ie浏览器
  var xmlDomVersions = ['MSXML.2.DOMDocument.6.0','MSXML.2.DOMDocument.3.0','Microsoft.XMLDOM'];
  for(var i=0;i<xmlDomVersions.length;i++){
  try{
   xmlDoc = new ActiveXObject(xmlDomVersions[i]);
   xmlDoc.async = false;
   xmlDoc.loadXML(xmlString); //loadXML方法载入xml字符串
   break;
  }catch(e){
  }
  }
 }
 //支持Mozilla浏览器
 else if(window.DOMParser && document.implementation && document.implementation.createDocument){
  try{
  /* DOMParser 对象解析 XML 文本并返回一个 XML Document 对象。
   * 要使用 DOMParser，使用不带参数的构造函数来实例化它，然后调用其 parseFromString() 方法
   * parseFromString(text, contentType) 参数text:要解析的 XML 标记 参数contentType文本的内容类型
   * 可能是 "text/xml" 、"application/xml" 或 "application/xhtml+xml" 中的一个。注意，不支持 "text/html"。
   */
  domParser = new DOMParser();
  xmlDoc = domParser.parseFromString(xmlString, 'text/xml');
  }catch(e){
  }
 }
 else{
  return null;
 }
 return xmlDoc;
 }
</script>

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Test XML

<&#63;xml version="1.0" encoding="utf-8" &#63;>
<DongFang>
 <Company>
 <cNname>1</cNname>
 <cIP>1</cIP>
 </Company>
 <Company>
 <cNname>2</cNname>
 <cIP>2</cIP>
 </Company> 
 <Company>
 <cNname>3</cNname>
 <cIP>3</cIP>
 </Company>
 <Company>
 <cNname>4</cNname>
 <cIP>4</cIP>
 </Company>
 <Company>
 <cNname>5</cNname>
 <cIP>5</cIP>
 </Company>
 <Company>
 <cNname>6</cNname>
 <cIP>6</cIP>
 </Company>
</DongFang>

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Usage:

var xmldoc=loadXML(text.xml)
var elements = xmlDoc.getElementsByTagName("Company");
for (var i = 0; i < elements.length; i++) {
 var name = elements[i].getElementsByTagName("cNname")[0].firstChild.nodeValue;
 var ip = elements[i].getElementsByTagName("cIP")[0].firstChild.nodeValue;
}

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I hope this article will be helpful to everyone in JavaScript programming.