用Javascript解析XML [英] XML Parsing in Javascript

问题描述

我试图解析来自XMLHttpRequest（用于Firefox扩展）的xml。在下面的代码中，req是一个XMLHttpRequest对象。在声明req之后，我做了 req.overrideMimeType（text / xml）;

  var shortURL; 
 var xmlDoc = document.implementation.createDocument（，，null）; 
 xmlDoc.async = false; 
 xmlDoc = req.responseXml; 
 if（xmlDoc.readyState == 4）{
 shortURL = xmlDoc.documentElement.childNodes [8] .text;如果我使用 req.responseXml  
 $ / code> 

$ c>如果我使用 req.responseText xmlDoc = req.responseXml;我得到一个错误，提示xmlDoc没有声明 / code>， xmlDoc.readyState == 4 变成false。



的JavaScript，所以请告诉我，如果我在这里做错了什么。

解决方案

我通常更喜欢使用 responseText ，然后使用浏览器内置的XML解析库来解析XML。之后，我通常会将生成的XML文档树或子树转换为JSON，以方便在JavaScript中访问。

我为此写了一个小实用程序库：

http://earth-api-samples.googlecode.com/svn/trunk/demos/myearth/lib/xmlutil.js

使用非常简单：

$ p $ var json = xmlNodeToJson（parseXml（req.responseText）;


I'm trying to parse an xml coming from an XMLHttpRequest (for a Firefox extension). In the following code, req is an XMLHttpRequest object. I did req.overrideMimeType("text/xml"); after declaring req.

var shortURL;  
var xmlDoc = document.implementation.createDocument("","",null);  
xmlDoc.async = false;  
xmlDoc = req.responseXml;  
if (xmlDoc.readyState == 4){  
    shortURL = xmlDoc.documentElement.childNodes[8].text;  
}

If I use req.responseXml I get an error saying "xmlDoc is not declared" for the line after xmlDoc = req.responseXml; If I use req.responseText, xmlDoc.readyState == 4 turns false.

I don't do much of javascript so please tell me if I'm doing something wrong here.

解决方案

I generally prefer using responseText and then parsing the XML using the browser's built in XML parsing library. After that, I generally convert the resulting XML document tree, or a sub tree, to JSON for easy access in JavaScript.

I wrote a tiny utility library for this here:

http://earth-api-samples.googlecode.com/svn/trunk/demos/myearth/lib/xmlutil.js

The usage is pretty simple:

var json = xmlNodeToJson(parseXml(req.responseText);

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