如何使用Javascript搜索XML文档信息？

Question

I am making an account system and at the moment I am writing the code for a test to see if a (username, email, ext) is registered. But to do this I need Javascript to read the XML docs with the info. How do you get Javascript to read the XML docs? Here is an example XML doc.

    <?xml version="1.0"?>
    <user>
        <firstName>Bob</firstName>
        <lastName>Smith</lastName>
        <email>bob.smith@fakeEmail.com</email>
        <username>BobS.</username>
        <password>pizza</password>
    </user>

Answer 1

There are two real steps here. I will use jquery for simplicity sake.

1.Get the XML resource:

AJAX: var xmlDoc = $.get('XMLURL').promise(function (xmlData){ //do step two });

Embedded in HTML like in this question: Embedding XML in HTML

2.Once you have the DOM:

Use jquery: http://api.jquery.com/jQuery.parseXML/

Or do it yourself: http://www.w3schools.com/xml/xml_parser.asp