What are the methods of sticky positioning in js

The js sticky positioning methods are: 1. Use the scroll event of the Window object to monitor scrolling events, and achieve sticky positioning by modifying the CSS style of the element; 2. Use the Intersection Observer API to achieve sticky positioning; 3. Use the requestAnimationFrame method Achieve sticky positioning; 4. Use CSS Sticky property to realize sticky positioning, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

JS sticky positioning is a technology commonly used in web development. It can keep an element stationary at a certain position on the page during scrolling, giving users a better interactive experience. The following will introduce several common methods to achieve sticky positioning in JS.

1. Use the scroll event of the Window object to monitor scrolling events, and achieve sticky positioning by modifying the CSS style of the element. The specific steps are as follows:

• Get the element that requires sticky positioning and its initial position relative to the top of the page.

• Listen to the scroll event of the Window object and obtain the scroll distance in the event handling function.

• Calculate where the element should be on the page based on the scroll distance and initial position, and modify the element's CSS style to keep it at that position.

2. Use the Intersection Observer API to achieve sticky positioning. The Intersection Observer API is an API that monitors the intersection status between an element and its parent element or window, and can be used to implement sticky positioning. The specific steps are as follows:

• Create an Intersection Observer object, specify the target element to observe and the callback function during observation.

• Determine the intersection status between the target element and its parent element or window in the callback function.

• Modify the CSS style of the target element based on the cross state to keep it at a certain position on the page.

3. Use the requestAnimationFrame method to achieve sticky positioning. requestAnimationFrame is a method that is executed before the browser redraws and can be used to achieve smooth sticky positioning effects. The specific steps are as follows:

• Get the element that requires sticky positioning and its initial position relative to the top of the page.

• Get the scroll distance in the callback function of requestAnimationFrame.

• Calculate where the element should be on the page based on the scroll distance and initial position, and modify the element's CSS style to keep it at that position.

• Call the requestAnimationFrame method again in the callback function to implement loop execution, thereby achieving smooth sticky positioning effect.

4. Use CSS Sticky property to achieve sticky positioning. The CSS Sticky property is a CSS property used to implement sticky positioning, which allows an element to be fixed at a certain position on the page when it is scrolled to a specified position. The specific steps are as follows:

• Add the position: sticky attribute to elements that require sticky positioning in CSS.

• Specify the top, bottom, left, or right attributes for the element and set the corresponding value to determine the element's position on the page.

The above are several common methods to achieve sticky positioning in JS. Different methods are suitable for different scenarios. Developers can choose the appropriate method according to specific needs to achieve sticky positioning effects.

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