It is very simple to implement list animation using Vue's transition-group component. The key is to master the following points: 1. Use
It is actually easier to use Vue's transition-group component than you think. It is specially used to deal with list transition effects, such as adding animations when adding, deleting, or sorting elements. The key is to understand the difference between it and ordinary transition and how to use it in conjunction with CSS.
Don't do the list animation manually
Many people think about using JS to control opacity or transform when doing list animations, but in fact, there is no need to be that trouble. Vue provides transition-group to solve this problem.
You just need to wrap the list item to be active in the <transition-group></transition-group> tag and add your favorite CSS transition class name. for example:
<transition-group name="list" tag="div">
<div v-for="item in items" :key="item.id">
{{ item.text }}
</div>
</transition-group>The CSS is written in the same way, which is the standard transition class name:
.list-enter-active,
.list-leave-active {
transition: all 0.5s ease;
}
.list-enter-from,
.list-leave-to {
opacity: 0;
transform: translateY(30px);
}In this way, when you add or remove an element, the transition effect will be automatically triggered.
Pay attention to the way key is written
Many people use v-for to render lists, they are used to using indexes as key . But in transition-group , this practice may cause abnormal animations.
Because Vue needs to use key to determine which element has come in and which has left. If index is used as key, once the data order changes, Vue may admit that "who is who" is wrong, and the animation is wrong.
So it is recommended: use a unique identifier as a key , such as id:
<transition-group name="list" tag="ul">
<li v-for="item in items" :key="item.id">
{{ item.name }}
</li>
</transition-group>In this way, Vue can correctly track the state changes of each element and the animation can be executed smoothly.
How to do sorting and moving animations?
In addition to adding or deleting, sometimes you also need to animate the sorting operation. At this time, you will find that directly calling reverse() of the array or resorting it seems that there is no animation.
In fact, transition-group provides a move class, which is specifically used to deal with this "position change".
You can write CSS like this:
.list-move {
transition: transform 1s ease;
} Note that .enter or .leave is not needed here. As long as move class is added, this transition will be automatically applied when the element needs to move its position.
At this time, you call items.reverse() and the element will move smoothly to the new position instead of jumping over instantly.
Basically that's it. By mastering these points, you can easily add smooth animation effects to your list. Remember a few key points: use transition-group to wrap the list, give each element a unique key, and add a move class if you want to sort animate. Not complicated but it is easy to ignore details, especially the way key and move are used.
The above is the detailed content of How to use the transition-group component?. For more information, please follow other related articles on the PHP Chinese website!
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