"null 2"

[Bannana97]

For some reason, document.getElementById("D1") is returning null... And it's clearly on the page..

Code: [Select]

<iframe id="D1" style="width:100px; height:100px; border:1px black solid; display:none;" src="Get.php?ID=1">
</iframe>
<div id="ReadURL" name="ReadURL">
<?php
$ID = $_GET['ID'];
$user = $_COOKIE['usern'];
if(!$user) {
$user = "Guest";
}
if(file_exists("Chat/$ID.php")) {

}
else {
$A = fopen("Chat/$ID.php", "w");
fwrite($A, "<script type=\"text/javascript\">
function reload(t) {
if(!t) {
if(!document.getElementById('D1')) { alert('null 2'); return false; }
document.getElementById('D1').src = document.getElementById('D1').src; // D1 is an IFrame.
setTimeout('reload(\'true\')', 1000);
}
else {
if(!document.getElementById('D1')) { alert('null 1'); return false; }
if(document.getElementById('D1').document.getElementById('ReadURL').innerHTML != document.getElementById('ReadURL').innerHTML) {
alert('false');
window.location.reload(true);
}
else {
setTimeout('reload()', 1000);
}
}
}
setTimeout('reload()', 2500);
</script>Welcome. To get started, type something in the chat box below.");
}
echo file_get_contents("Chat/$ID.php");
?>

</div>


[Rob Pomeroy]

What is this line supposed to do?

Code: [Select]

document.getElementById('D1').src = document.getElementById('D1').src;
And:

Code: [Select]

!document.getElementById('D1')
Have you checked the spec for getElementById()?  Can you negate it?

I have to say once more, the javascript prototype library makes this kind of stuff much easier.  "$('id')" instead of "document.getElementById('id')".  Nice.  http://prototypejs.org/

Also, using the debug console of the Web Developer plugin for Firefox is a lifesaver.