css - Sticky Div within Container - no overlap with footer -

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i using jsfiddle: jsfiddle

in site, getting following error: uncaught typeerror: cannot read property 'top' of undefined

the line breaks of jsfiddle:

var sidebartop = $sidebar.position().top;

what reason?

just give idea of trying solve. have div in top of page, , set position fixed. when user scroll bottom of page, div overlaps footer. need to stop (stick) div in place , not go more bottom once passes point

it's not breaking on either jsfiddle or on side. there might possibility write js script before html loaded. try write js/jquery code @ end after html page.

refferences javascript on bottom of page?


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