Why does it cause jitter when using setInterval to automatically scroll the list?

Why does jitter occur when using setInterval to automatically scroll the list?

In web development, automatic scrolling effects (such as news scrolling and product display) are very common. setInterval combined with scrollTop attribute is a common implementation method, but it is easy to cause scroll jitter.

The reader provides a sample code to implement top-down scrolling using setInterval and scrollTop :

 rollStart() {
    var ulbox = document.getElementById("roolList");
    if (ulbox.scrollTop >= ul1.scrollHeight) {
        ulbox.scrollTop = 0;
    } else {
        ulbox.scrollTop = 1;
    }
}

setInterval(this.rollStart, t);

The code calls the rollStart function every t milliseconds, incrementing the scrollTop property of ulbox element to achieve upward scrolling. When scrolling to the top, scrollTop resets to 0, scrolling in a loop.

The reason for jitter is that the execution time of setInterval is not completely accurate. Even if a fixed t value is set, there may be slight deviations in the actual execution time, resulting in uneven scrollTop changes and visual jitter. Frequent modification of DOM properties will also affect the browser's rendering efficiency and aggravate jitter.

The solution is to avoid direct and frequent operation scrollTop . It is recommended to use a smoother DOM API, such as the Element.scrollTo() method, to better utilize the browser rendering mechanism and avoid jitter. scrollTo() method can smoothly control the scroll position and improve the user experience. For more details, please refer to the MDN Web Docs documentation on Element.scrollTo() method.

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