Cross browser JavaScript (not jQuery…) scroll to top animation

Question

I\'m looking for a simple, cross-browser \"scroll to top\" animation I can apply to a link. I don\'t want to require a JS library such as jQuery/Moo, etc.

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Answer 1

Linear scrolling animation to bottom. Pure JS, no JQuery. Maybe my solution will be helpful for someone.

let action_count = 8;
let speed_ms = 15;
let objDiv = document.getElementsByClassName('js_y5_area3').item(0);

let scroll_height = objDiv.scrollHeight;
let window_height = objDiv.offsetHeight;

let scroll_top = objDiv.scrollTop;
let need_scroll_top = scroll_height - window_height;

if (scroll_top < need_scroll_top)
{
    let step = Math.ceil((need_scroll_top - scroll_top) / action_count);

    let scrollInterval = setInterval(function()
    {
        scroll_top += step;
        objDiv.scrollTop = scroll_top;

        if (scroll_top >= need_scroll_top)
        {
            clearInterval(scrollInterval);
        }

    }, speed_ms);
}

You can change variables action_count, speed_ms to configure scrolling animation on your taste.