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getElementsByTagName not finding desired tag

 
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helloise



Joined: 17 Feb 2011
Posts: 5
Location: sdfsd
PostPosted: Thu Aug 11, 2011 2:16 pm    Post subject: getElementsByTagName not finding desired tag Reply with quote
i have this part of code in JS:

Code:

     var receiveReq = getXmlHttpRequestObject();
     function getXmlHttpRequestObject()
     {
          if (window.XMLHttpRequest)
         {
              return new XMLHttpRequest();
         }
     }


function getChatText()
{
      if (receiveReq.readyState == 4 || receiveReq.readyState == 0)
      {                 
           receiveReq.open("GET","getChat_xml.php?chat=1&last=7", true);
           receiveReq.onreadystatechange = handleReceiveChat;
           receiveReq.send();
      }
}

function handleReceiveChat()
{
     if (receiveReq.readyState == 4)
     {
          var chat_div = document.getElementById('div_chat');
          var xmldoc = receiveReq.responseXML;
          var message_nodes = xmldoc.getElementsByTagName("message");
      }
}


then in my getChat_xml.php i have:

Code:

$xml = '<?//xml version="1.0" ?><root>';
$last = 7;
$sql = "SELECT message_id, user_name, message, date_format(post_time, '%h:%i') as post_time" .
      " FROM message WHERE chat_id = " . db_input($_GET['chat']) . " AND message_id = " . $last;
   $message_query = db_query($sql);

while($message_array = db_fetch_array($message_query))
{
    $xml .= '<message id="' . $message_array['message_id'] . '">';
    $xml .= '<user>' . htmlspecialchars($message_array['user_name']) . '</user>';
    $xml .= '<text>' . htmlspecialchars($message_array['message']) . '</text>';
    $xml .= '<time>' . $message_array['post_time'] . '</time>';
    $xml .= '</message>';
}

$xml .= '</root>';
echo $xml;


i get a "cannot cal a method getElementsByTagName of null" ???

i have no idea whats going on, help please?
thanks
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paolosca



Joined: 09 Sep 2010
Posts: 384
PostPosted: Fri Aug 12, 2011 7:11 am    Post subject: Re: getElementsByTagName not finding desired tag Reply with quote
Hi Helloise,

On 08/11/2011 10:16 PM, helloise wrote:
Quote:
i get a "cannot cal a method getElementsByTagName of null" ???

It's hard to check without the whole code, did you set the right
Content-Type in the reply headers? Also the xml syntax doesn't look
correct to me, you should probably use <?xml version="1.0" ?> instead of
<?//xml version="1.0" ?>.


I.E.:

$xml = '<?xml version="1.0" ?>\n';
$xml .= '<root>\n';

// your code here

$xml .= '</root>\n';

header("Pragma: ");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Content-Type: text/xml");
header("Content-Disposition: attachment; filename=\"result.xml\"");

echo($xml);


Regards,


Paolo.
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helloise



Joined: 17 Feb 2011
Posts: 5
Location: sdfsd
PostPosted: Fri Aug 12, 2011 7:41 am    Post subject: Reply with quote
thank you wil take out the "//" and i changed
var xmldoc = receiveReq.responseText;

with

var xmldoc = receiveReq.responseXML;
and xmldoc now contain the right values
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