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Once you have got your response back from the server
you need to break it up into its component parts
(assuming that there is more than one pices to the
information) and then use the DOM to update the web
page with the information. Where we get the respose
from the responseText field (which is always available)
we then have to parse the content ourselves in order to
determine what parts of the content are what.
When we retrieve XML from the server we have both the
responseText and the responseXML fields being populated
and the advantage to using responseXML is that the work
of parsing the XML is done for us.
Presumable since both the Javascript that sends the
request and the server side processing that builds the
response based on that request are both on our web site
we should know what XML fields can or might be passed
back in the response. We can then use methods on the
responseXML field to retrieve the content of specific
fields using near identical code to that which we would
use to retrieve the content of certain containers
within our web page. For example if we are exmecting a
number of entries inside <price> </price>
tags in the XML then we can extract them into a
Javascript array using:
var xmlDoc = request.responseXML;
var priceArray =
xmlDoc.getElementsByTagName('price');
To extract the information from the XML document into
Javascript for processing is effectively identical to
how we would retrieve information from the web page for
processing via the DOM except for the names of the
containers.
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