Get dynamically given div id's from document - php

Question

I'm not a developer but I've been dabbling around with this for a while. Hope you can help
I have several div's with ID:s that are given to them dynamically through php. I have a function that is called through a checkbox which hides and shows the divs. What I want to do now is to get the div ids from the document and put them into the function.
I've kind of copied codes from different forums and it works if I'm hard coding the div names. Not sure what I'm doing now though, any help would be appreciated.
Here's what I have
Assigns id's to the divs:
$a .= "<div id='$go[media_caption]" . $i . "'>";
The function:
var editorial = [id^='editorial']);
function visiblox(arrDiv, hs) {
var disp = (hs) ? 'none' : 'block';
for(var x = 0; x < arrDiv.length; x++) {
document.getElementById(arrDiv[x]).style.display = disp;
}
}
function chk(what, item) {
if(item) {
visiblox(what, false);
} else {
visiblox(what, true);
}
}
Calls the function:
<input type='checkbox' onclick='chk(editorial, this.checked);' checked> Editorial</p>

Answer 1

Can you have your PHP output an array for your Javascript to use? As PHP outputs the IDs, it would also add them to a string that is in the syntax of a Javascript array. Something like this:
$a .= "<div id='$go[media_caption]" . $i . "'>";
$jsIDs .= "'$go[media_caption]',";
Then at the end of the file, just before you the PHP file closes the </body> and </html> tags, output the array as a script:
$jsIDs = substr($jsIDs, 0, strlen($jdIDs)-1); // strip off the last comma
$jsIDs = "<script type='text/javascript'>var idArr = [" . $jsIDs . "];</script>";
echo($jsIDs);
Then inside the javascript, you don't need to look up the IDs in the DOM. You can just use the array (in my example, I called it idArr).
UPDATE: Martin says the IDs output by PHP sometimes start with "editorial", some start with something else. To collect only the ones that start with "editorial", change the line above that starts with $jsIDs .= to these two lines:
if ( substr($go[media_caption], 9) == "editorial" )
$jsIDs .= "'$go[media_caption]',";
That should do the trick.