XML Response Parsing Issue

I am having an issue with reading the XML Response from my XML HTTP Requests. Whenever I only use a single element, like:

<response>text here</response>

I have no issues checking for it using xml.getElementsByTagName('response')[0]. But if I include another element, such as:

<response>text here</response>
<date>my date</date>

The check fails, and xml.getElementsByTagName('response')[0] returns null. I am echoing the xml with PHP using the herodoc syntax (echo<<<XML), could this be part of the problem (like whitespace or extra lines)?
LVL 3
cloud-9Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

leakim971MultitechnicianCommented:
the second one is not a valid XML content, it should be :


<object>
   <response>text here</response>
   <date>my date</date>
</object>

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
kadabaCommented:
(Ideally for me even the first one is not, even though it will be correct to have a single node under the parent) The xml should always be wrapped under a root element.

 <?xml version="1.0"?>
<root>
<parent>
<child>
<subchild>
</subchild>
</child>
</parent
</root>

So it would be nice to have it say,
<respxml>
<response>
text here
</response>
</respxml>

So even if you add new child elements inside the respxml the xml will be valid and you would not run into trouble.

<respxml>
<response>
text here
</response>
<date>
my date
</date>
</respxml>

Best,
kadaba
MichaelMHCommented:
The XML sample presented by you is not valid one. In the first case, when you have only one element, that element is the root of your XML so that's why your code is working. But in the second case, when you have two elements on same level, the XML format is invalid since this means that you have two root nodes.
In this case you should wrap your XML content in a root node;

<root>
  <response>text here</response>
   <date>my date</date>
</root>

as leakim971 specified.
OWASP: Avoiding Hacker Tricks

Learn to build secure applications from the mindset of the hacker and avoid being exploited.

Ray PaseurCommented:
PHP can help you understand this.  See the code snippet.  Outputs:

object(SimpleXMLElement)#1 (1) {
  [0]=>
  string(9) "text here"
}


Warning:  simplexml_load_string() [function.simplexml-load-string]: Entity: line 2: parser error : Extra content at the end of the document in /home/websitet/public_html/RAY_temp_cloud9.php on line 19
Warning:  simplexml_load_string() [function.simplexml-load-string]: <date>my date</date> in /home/websitet/public_html/RAY_temp_cloud9.php on line 19
Warning:  simplexml_load_string() [function.simplexml-load-string]: ^ in /home/websitet/public_html/RAY_temp_cloud9.php on line 19

bool(false)

<?php // RAY_temp_cloud9.php
error_reporting(E_ALL);
echo "<pre>";

// TEST DATA SETS
$xml = <<<XML
<response>text here</response>
XML;

$bad = <<<BAD
<response>text here</response>
<date>my date</date>
BAD;

// CONVERT THE XML STRINGS TO OBJECTS
$obj = SimpleXML_Load_String($xml);
var_dump($obj);

$obj = SimpleXML_Load_String($bad);
var_dump($obj);

Open in new window

Ray PaseurCommented:
@cloud-9: I think leakim971 deserves at least partial credit here, and maybe all the credit - that was the first correct answer you received and it was less than 30 minutes after asking the question.  You can use the "request attention" button to contact a moderator.  The moderator can tell you how to split the points among the answers.  Best regards, ~Ray
leakim971MultitechnicianCommented:
Thanks for the points! Best Regards to Mr Ray Paseur!
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
JavaScript

From novice to tech pro — start learning today.