Javascript in Oracle Apex, "Cannot call method substr of undefined"

Question

I'm trying to use a JavaScript function on an Oracle Apex webpage. The object is to have a link which when initially clicked, opens all subregions and when clicked again, closes all subregions. Essentially, a simple toggle. The function is below:

initContentFrameTabs = function(){
$('div.uFrameRegionSelector > ul li a').click(function(e){
e.preventDefault();
link = $(this);
subregions = link.parents('.uFrameMain').find('section.uHideShowRegion');
link.parents("ul").find('li a').removeClass('active')

if (link.hasClass('showAllLink')) {
   expandAllSections();
   // subregions.show();
   link.addClass('active');
   document.getElementById('Title').innerHTML = 'Hide All';
 } else if (link.hasClass('active')) {
   hideAllSections();
   link.parents("ul").find('li a').removeClass('active')
   document.getElementById('Title').innerHTML = 'Show All';
 } else {
   expandSection(link.attr('id').substr(4));
   // subregions.hide();
   // $('#'+link.attr('id').substr(4)).show();
   link.addClass('active')
 }
})
}

It seems to work initially, as I click on my link, it opens all sub regions and the text changes to reflect it's new function, ie, Hide All.
However, from that point on, it doesn't work. I receive an error at that point, being:

Uncaught TypeError: Cannot call method 'substr' of undefined

It claims this error is being throw at my substring line, just after the else clause.
Can anyone shed some light on why this is happening?

John Tseng · Accepted Answer · 2013-06-27 22:46:40Z

1

Well, it looks like link.attr('id') is undefined. So I would take a look to see if that link still has an ID attribute after your initial click. Chances are, the link was recreated and it wasn't created with an id the second time.

First though, after your link, open up your DOM and see if the link still has the attribute.

answered Jun 27, 2013 at 22:46

John Tseng

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