javascript - Keep element a set distance from top of browser screen without using CSS? -

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i using bootstraps modals , adding position:fixed doesnt work.

i have arrow element pointing towards modal triggering element. want arrow point trigger wherever trigger on screen.

i can enough with:

$("[data-toggle='modal']").click(function() {     triggerpos = $(this).offset().top;     $('.modal-arrow').css('top', triggerpos + "px"); });

the problem if there long modal causes user scroll, arrow doesn't stay fixed; moves modal user scrolls.

see fiddle: https://jsfiddle.net/umv4jhlg/22/

of course have tried various arrangements css, no result.

i have tried adjusting on window scroll:

$(window).scroll(function(){   var triggerpos = $(this).offset().top;     $('.modal-arrow').css('top', triggerpos + "px");   })

but no results.

would know of way can keep .modal-arrow steady using jquery?

try .scrolltop()

add top position


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