How to solve the problem of page jitter caused by dynamically setting elements to fixed in JavaScript?

JS dynamically set element to fixed page jitter and solution

When dynamically positioning elements as fixed using JavaScript, you often encounter problems with page jitter, especially when listening to scroll events and adjusting element positioning according to scroll position. This article will analyze the root causes of the problem and provide effective solutions.

The following code snippet shows common problem code that causes jitter:

 window.addEventListener('scroll', this.handleTabFix);

handleTabFix () {
  let timeOut = null;
  clearTimeout(timeOut);
  timeOut = setTimeout(() => {
    const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
    const offsetTop = document.querySelector('#testNavBar')?.offsetTop 60;
    this.isFixTab = scrollTop > offsetTop;
    // When this.isFixTab is true, set the element to fixed
  }, 1000);
}

In the code, window.addEventListener listens for scrolling events, and handleTabFix function decides whether to set the element to fixed based on the scroll position. However, frequent fixed state switching can cause page height to change, causing jitter.

To address this problem, we propose two effective solutions:

1. Use position: sticky : CSS's position: sticky attribute allows elements to remain in the view during scrolling without affecting the page layout, effectively avoiding jitter caused by height changes.

2. Set a container with fixed height for an element: Add a container with fixed height to the element before setting it to fixed . When the element becomes fixed , the container still occupies the original space, keeping the page height unchanged, thereby eliminating jitter.

Through the above methods, you can effectively solve the problem of page jitter caused by dynamically setting elements to fixed in JavaScript, ensuring a smooth scrolling experience for the page.

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