JAVASCRIPT

scrollheight jquery

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

jquery scrollHeight

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

determine scrollHeight using jquery?

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