从 XMLHttpRequest 解析 XML
我正在使用 QML 和 XMLHttpRequest 来获取一些 XML 数据。
var doc = new XMLHttpRequest();
if (doc.readyState == XMLHttpRequest.DONE) {
var root = doc.responseXML.documentElement;
// Go through recenttracks children
var recentTracks = root.childNodes[1];
for (var i=0; i < recentTracks.childNodes.length; ++i)
{
var child = recentTracks.childNodes[i];
for (var j=0; j < child.childNodes.length; ++j)
{
if (child.childNodes[j].nodeName == "name")
{
console.log(child.childNodes[j].nodeValue); // [!]
}
}
}
}
例如，我正在解析这样的 XML。
<track>
<artist mbid="293f35f8-3682-44bd-9471-13ca94fa9560">Tyler James</artist>
<name>Tried To Measure</name>
<streamable>0</streamable>
<album mbid="">It Took The Fire</album>
<url>http://www.last.fm/music/Tyler+James/_/Tried+To+Measure</url>
<image size="small">http://userserve-ak.last.fm/serve/34s/59408859.jpg</image>
</track>
现在看一下代码[!]中的注释。在该行之前，我检查当前节点名称是否为“name”（查看 XML）。现在我想获取 name 值。我写的是：child.childNodes[j].nodeValue，但它 10 次都返回 null（有 10 个子节点）。怎么了？
I'm using QML and XMLHttpRequest for fetching some XML-data.
var doc = new XMLHttpRequest();
if (doc.readyState == XMLHttpRequest.DONE) {
var root = doc.responseXML.documentElement;
// Go through recenttracks children
var recentTracks = root.childNodes[1];
for (var i=0; i < recentTracks.childNodes.length; ++i)
{
var child = recentTracks.childNodes[i];
for (var j=0; j < child.childNodes.length; ++j)
{
if (child.childNodes[j].nodeName == "name")
{
console.log(child.childNodes[j].nodeValue); // [!]
}
}
}
}
I'm parsing, for example, such XML.
<track>
<artist mbid="293f35f8-3682-44bd-9471-13ca94fa9560">Tyler James</artist>
<name>Tried To Measure</name>
<streamable>0</streamable>
<album mbid="">It Took The Fire</album>
<url>http://www.last.fm/music/Tyler+James/_/Tried+To+Measure</url>
<image size="small">http://userserve-ak.last.fm/serve/34s/59408859.jpg</image>
</track>
Now look at comment in code [!]. Before that line I'm checking whether current node name is "name" (look at XML). Now I want to get name value. I wrote: child.childNodes[j].nodeValue, but it returns null all 10 times (there are 10 children). What's wrong?
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DOM 中元素节点的文本由子元素（文本节点）表示。文本节点的值就是您想要的。
因此更改
为
使其工作。
请参阅 http://www.w3schools.com/dom/dom_nodes_get.asp
也许还可以考虑使用 XmlListModel。
The text of an element node in the DOM is represented by a child element (a text node). The value of the text node is what you want.
So change
into
to make it work.
See http://www.w3schools.com/dom/dom_nodes_get.asp
Maybe also consider using a XmlListModel.