Question

As per the title really.

If notice that if I check $(elem).css('margin-top') it returns 0px even though I haven’t explicitly set this style, either inline or in a stylesheet.

Basically I am setting the margin each time I hover over an element (to vertically align some content) so would rather just do this once.

I can’t set the alignment on page load because the elements are hidden (display:none) so it needs to be done at the time they are displayed.

Answer 1

if(!$(elem).data('hasSetMargin')){
    $(elem).css('margin-top', someValue);
    $(elem).data('hasSetMargin', true);
}