if window scroll jquery code example

Example 1: jquery on scroll down

Check current scrollTop vs previous scrollTop

var lastScrollTop = 0;
$(window).scroll(function(event){
   var st = $(this).scrollTop();
   if (st > lastScrollTop){
       // downscroll code
   } else {
      // upscroll code
   }
   lastScrollTop = st;
});

Example 2: angular scroll event on div chang width

<body style="overflow: scroll; height: 1000px;" onload="scrollDetect()">
    <div class="firstdiv" style="border:1px solid black; margin: 0 auto; width: 200px;height: 200px;">
    </div>

    <script>
        function scrollDetect() {
            let div = document.querySelector('.firstdiv')
            var lastScroll = 0;
            window.onscroll = function () {
                let currentScroll = document.documentElement.scrollTop; // Get Current Scroll Value
                if (currentScroll > 0 && lastScroll <= currentScroll) {
                    lastScroll = currentScroll;
                    div.style.width = '50%'
                    div.style.height = "50%";
                    div.style.background = "red";
                    div.style.position = "relative";
                    div.style.top = "0";
                    div.style.left = "0";
                } else {
                    lastScroll = currentScroll;
                    div.style.width = '200px'
                    div.style.height = '200px'
                }
            };
        }
    </script>
</body>

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