如何从通过XMLHttpRequest接收的HTML页面创建DOM对象? [英] How to create DOM object from html page received over XMLHttpRequest?
问题描述
我正在开发Chrome扩展程序，因此我对要请求权限的域具有XMLHttpRequest的跨主机权限.
我已经使用XMLHttpRequest并获得了HTML网页(txt/html).我想使用XPath(document.evaluate)从中提取相关位.不幸的是，我无法从返回的html字符串构造DOM对象.
I have used XMLHttpRequest and got an HTML webpage (txt/html). I want to use XPath (document.evaluate) to extract relevant bits from it. Unfortunatly I'm failing to construct a DOM object from the returned string of the html.
var xhr = new XMLHttpRequest();
var name = escape("Sticks N Stones Cap");
xhr.open("GET", "http://items.jellyneo.net/?go=show_items&name="+name+"&name_type=exact", true);
xhr.onreadystatechange = function () {
if (xhr.readyState == 4) {
var parser = new DOMParser();
var xmlDoc = parser.parseFromString(xhr.responseText,"text/xml");
console.log(xmlDoc);
}
}
xhr.send();
console.log 用于在Chromium JS控制台中显示调试内容.
console.log is to display debug stuff in Chromium JS console.
在上述JS控制台中.我明白了:
In the said JS console. I get this:
Document
<html>
<body>
<parsererror style="display: block; white-space: pre; border: 2px solid #c77; padding: 0 1em 0 1em; margin: 1em; background-color: #fdd; color: black">
<h3>This page contains the following errors:</h3>
<div style="font-family:monospace;font-size:12px">error on line 1 at column 60: Space required after the Public Identifier
</div>
<h3>Below is a rendering of the page up to the first error.</h3>
</parsererror>
</body>
</html>
那么我应该如何使用XMLHttpRequest->接收HTML->转换为DOM->使用XPath进行横向转换?
So how am I suppose to use XMLHttpRequest -> receive HTML -> convert to DOM -> use XPath to transverse?
我应该使用隐藏的" iframe hack来加载/接收DOM对象吗?
Should I be using the "hidden" iframe hack for loading / receiving DOM object?
推荐答案
DOMParser使DOCTYPE定义令人窒息.如果没有关闭/，任何其他非xhtml标记(例如< link> )也会出错.您可以控制要发送的文件吗?如果不是，最好的选择是将其解析为字符串.使用正则表达式查找所需内容.
The DOMParser is choking on the DOCTYPE definition. It would also error on any other non-xhtml markup such as a <link> without a closing /. Do you have control over the document being sent? If not, your best bet is to parse it as a string. Use regular expressions to find what you are looking for.
编辑:通过将浏览器注入到隐藏的div中，您可以让浏览器为您解析正文内容:
You can get the browser to parse the contents of the body for you by injecting it into a hidden div:
var hidden = document.body.appendChild(document.createElement("div"));
hidden.style.display = "none";
hidden.innerHTML = /<body[^>]*>([\s\S]+)<\/body>/i(xhr.responseText)[1];
现在在 hidden 中进行搜索以找到所需内容:
Now search inside hidden to find what you're looking for:
var myEl = hidden.querySelector("table.foo > tr > td.bar > span.fu");
var myVal = myEl.innerHTML;
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