The implementation of CSS scroll snap requires attention to structure and property settings. First, create a scrollable container and set scroll-snap-type; secondly add scroll-snap-align for the child elements; 1. The container needs to set overflow and scroll-snap-type, such as .container { overflow-x: auto; scroll-snap-type: x mandatory; }; 2. The child elements need to set scroll-snap-align, such as .item { scroll-snap-align: start; }; the scroll direction is determined by the axial (x or y), and the adsorption type is divided into mandatory (forced alignment) and proximity (align when close); when using it, the child elements need to be unified to avoid padding, and margin and scroll-padding are reasonably set To work with layouts, such as horizontal card lists, you can calculate widths through flex layouts in conjunction with calc to ensure correct alignment.

CSS scroll snap is a very practical function, especially in scenarios where horizontal scrolling, pagination display or precise control of the scroll position. It allows the page to "suck" to a specific location when scrolling, improving the user experience. It is not complicated to implement, but there are several key points that need attention.

Basic structure and property settings

To use scroll snap, you must first have a container that can be scrolled. Usually an element with overflow: auto or overflow: scroll set. Then add scroll-snap-type attribute to this container to tell the browser that the scrolling behavior of this container has an adsorption effect.

for example:

 .container {
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}

The above code means: this container can be scrolled horizontally, and it must be adsorbed to the child elements when scrolling.

Each child element (that is the block you want it to stop) also needs to add scroll-snap-align attribute, such as:

 .item {
  scroll-snap-align: start;
}

This way the browser knows that the element should be aligned to the start position of the container.

Rolling direction and adsorption type selection

The value of scroll-snap-type consists of two parts: axial (x or y) and type (mandatory or proximity).

• Axial : Decide whether horizontal or vertical scrolling takes effect.
• type :
  • mandatory : As long as the user stops scrolling, the nearest adsorption point will be forced to align.
  • proximity : It will only automatically adsorb when the rolling action is slower or close to the adsorption point, otherwise it will be like ordinary scrolling.

For example, if you make a full-screen vertical scrolling website, use scroll-snap-type: y mandatory; to ensure that every swipe will stop on a complete section.

If it is a horizontal scrolling card that focuses on fast sliding experience, it may be more suitable to use proximity to make scrolling more natural.

Notes on arrangement and style of child elements

Although scroll snap seems to only need to add a few attributes to use, you will still encounter some "strange" situations in actual development. For example, sometimes the rolling cannot be done at the expected position, or the adsorption is misaligned.

This is often caused by inconsistent size, spacing, or padding settings of child elements.

A few suggestions:

• Do not add padding to the container at will, as it may easily affect the adsorption calculation.
• The width/height of the child elements is as uniform as possible, especially when scrolling horizontally, it is best to clearly specify .item { width: 100%; } or fixed value.
• If margin is used to separate child elements, consider compensating the container with scroll-padding .
• When you arrange child elements with Flexbox or Grid, be aware that they may change the scrolling behavior.

For example, if you have a horizontally scrolled card list with 20px intervals between each card, then you can handle it like this:

 .container {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding: 0 20px;
}

.item {
  flex: 0 0 calc(100% - 20px);
  margin-right: 20px;
  scroll-snap-align: start;
}

This avoids alignment offsets due to margin.

Basically that's it. The key to implementing CSS scroll snap behavior is clear structure, unified style, and reasonable use of related attributes. It looks simple, but it is easy to cause problems if you don't pay attention.

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