What are the fixed positioning methods?

Fixed positioning methods include using the CSS attribute position, using JavaScript to achieve fixed positioning, using plug-ins to achieve fixed positioning, etc. Detailed introduction: 1. Use the CSS attribute position. "position: fixed" is an attribute in CSS that can fix an element at a specified position on the page. By setting the top, bottom, left, and right attributes of the element, you can adjust the position of the element on the page. position; 2. Use JavaScript to achieve fixed positioning, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Fixed positioning is a technique commonly used in web development, which allows elements to maintain a fixed position on the page and not change position as the page scrolls. Fixed positioning can provide better user experience and visual effects for web pages. This article will introduce several commonly used fixed positioning methods.

1. Use the CSS attribute position

position: fixed is a property in CSS that can fix an element at a specified position on the page. By setting the top, bottom, left, and right attributes of the element, you can adjust the position of the element on the page. For example, use the following CSS code to fix an element to the lower right corner of the page:

.fixed-element {
    position: fixed;
    bottom: 20px;
    right: 20px;
}

2. Use JavaScript to achieve fixed positioning

In addition to using the CSS attribute position: fixed, we can also use JavaScript to implement fixed positioning. The following is a sample code that uses JavaScript to implement fixed positioning:

window.addEventListener('scroll', function() {
    var element = document.getElementById('fixed-element');
    var rect = element.getBoundingClientRect();
    if (rect.top <= 0) {
        element.style.position = &#39;fixed&#39;;
        element.style.top = &#39;0&#39;;
    } else {
        element.style.position = &#39;relative&#39;;
        element.style.top = &#39;auto&#39;;
    }
});

In the above code, we listen to the scroll event of the page and obtain the position information of the element to be fixedly positioned. When the position of the element exceeds the top of the page, we set the element's position attribute to fixed and the top attribute to 0 to achieve fixed positioning. When the element's position returns to the inside of the page, we set the element's position attribute to relative and the top attribute to auto to cancel the fixed positioning.

3. Use plug-ins to achieve fixed positioning

In addition to manually writing code to achieve fixed positioning, we can also use some open source plug-ins to achieve fixed positioning. These plug-ins usually provide more configuration options and functions, making it easier to achieve fixed positioning effects. Some commonly used fixed positioning plug-ins include Sticky Kit, ScrollMagic and Waypoints.

Summary

Fixed positioning is a common web development technique that allows elements to maintain a fixed position on the page. This article introduces several commonly used fixed positioning methods, including using the CSS attribute position: fixed, using JavaScript to achieve fixed positioning, and using plug-ins to achieve fixed positioning. According to actual needs and personal preferences, choose the appropriate method to achieve fixed positioning effects.

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