How to parse XML in JavaScript from Google

问题

I want to parse this XML Document http://www.google.de/ig/api?weather=Braunschweig,%20Deutschland I want to be able to read out condition, temp_c and humidity. All this I want to do inside of JavaScript without using any server sided scripts such as PHP and I want it to work on modern browsers as well as IE7 and if without many problems IE6 EDIT: A solution without a framework would be ideal

回答1:

Unless you are working on a page hosted on google.de — you can't.

The same origin policy prevents JS running in a webpage on your site from accessing a document on a remote site.

You have to involve a server side process in order to either convert the XML into a format that you can handle remotely (such as JSON-P, which Yahoo! Pipes will do for you) or relay the data through your own server with a server side process accessible in the same origin as the page.

回答2:

There is a good tutorial at Ajaxian on how to parse XML with jQuery http://ajaxian.com/archives/ajaxian-featured-tutorial-parsing-xml-with-jquery hope it helps

edit: the tutorial actually is here: http://blog.reindel.com/2007/09/24/jquery-and-xml-revisited/

回答3:

I've had some luck parsing XML in javascript with code like:

var xmlDoc = this.req.responseXML.documentElement;
var tStatus = xmlDoc.getElementsByTagName("status")[0].firstChild.data;
var tOtherURL = xmlDoc.getElementsByTagName("otherurl")[0].firstChild.data;
var tRows = xmlDoc.getElementsByTagName("rows")[0].firstChild.data;

Keep in mind that I don't really know Javascript and I cargo-cult'ed this from somewhere else.

回答4:

In Firefox and Opera the solution is very easy: They have builtin XPath support. So you just evaluate an XPath expression on the DOM of the XML response.

With IE there's more work to do. Someone else asked basically the same question before and the reasonable answer is: You'll need to employ JavaScript library that will allow you to use XPath. Otherwise you end up writing your problem-specific parsing code yourself.