Allow function to dynamically calculate stickyHeaders_offset

[MartinMuzatko]

Hello.

My fixed header is responsive, it resizes on mobile. However, tablesorter does not account for that as it looks.

I think the height is only retrieved once on initialization, not when making the sticky header visible.

[Mottie]

Hi @MartinMuzatko!

Hmm, both the stickHeaders and cssStickyHeaders widgets should allow for updating of the offset widget option dynamically, but you won't see the updated value get applied until the page is scrolled, or you trigger a "resize" event on the window.

And of course I just tested it and it didn't work 🤣

I'll spend some time on this today.

[MartinMuzatko]

Thank you :)

[Mottie]

Ok, this fix is now available in the master branch for the stickyHeaders widget. The cssStickyHeaders widget was already working properly.

If you don't want to trigger a "resize" event, you could also trigger a "stickyHeadersUpdate" event on the table to apply the modified offset:

$('table').trigger('stickyHeadersUpdate');

[Mottie]

Here's a demo that changes the offset after 5 seconds: https://jsfiddle.net/f36416oy/42/