在XML中评估XPath表达式 [英] Evaluating an XPath expression in XML

问题描述

使用附加SDK创建Firefox附件时，如何处理XML文件？
使用XPath评估会抛出一个错误：

lockquote
XPathResult未定义

我正在处理此XML数据：

var iterator = xmlDoc.evaluate（'/ / stream'，xmlDoc，null，XPathResult.ORDERED_NODE_ITERATOR_TYPE，null）;


解决方案

是的，窗口中有很多全局类上下文不在沙箱的SDK模块中。您可以通过 nsIDOMXPathResult 界面：
$ b

var {Ci} = require（chrome）;
var iterator = xmlDoc.evaluate（'// stream'，xmlDoc，null，
Ci.nsIDOMXPathResult.ORDERED_NODE_ITERATOR_TYPE，null）;


When using the Add-on SDK to create a Firefox add-on, how do you process an XML file? Evaluate with XPath throws an error:

XPathResult is not defined

I am trying to process this XML data with this code:

var iterator = xmlDoc.evaluate('//stream', xmlDoc, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);

解决方案

Yes, a lot of global classes available in the window context aren't there in SDK modules which are sandboxes. You can access this constant via nsIDOMXPathResult interface:

var {Ci} = require("chrome");
var iterator = xmlDoc.evaluate('//stream', xmlDoc, null,
    Ci.nsIDOMXPathResult.ORDERED_NODE_ITERATOR_TYPE, null);

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