colorbox check parent element exist -

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I am using colorbox to open a window that shows a grid with categories to select the check box After, I attract categories on the parent window. So far good.

My problem is that before I check that the category exists in the original window, but it is not working 

  if ($ ('# cat- 2 ', window.parent.document) .length == 0) $ (' # categories', window.parent.document) .append (newdata);

Am I missing something

if ($ ('# Cat-2', window.parent.document) Length == 0) is saying "# cat -2 no do something while it is present".

Probably only try if ($ ('# cat-2', window.parent.document) .length)


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