scrollheight jquery

1document.documentElement.scrollTop || document.body.scrollTop

1$('#myDiv').prop('scrollHeight')

1$('#test')[0].scrollHeight

1Syntax
2Trigger the scroll event for the selected elements:
3$(selector).scroll()
4
5Attach a function to the scroll event:
6$(selector).scroll(function)

1$('#leave-reason-input').keyup(function() {
2        var height = $(this).scrollTop();
3        var initHeight = 5;
4    if(initHeight < height ) {
5          $(this).css({'height':'8rem'});
6    }
7})