current position:Home>[Vue] principle analysis of transition effect
[Vue] principle analysis of transition effect
2021-08-27 08:54:48 【Not null】
This is my participation 8 The fourth of the yuegengwen challenge 20 God , Check out the activity details :8 Yuegengwen challenge
summary
Vue In the insert 、 Update or remove DOM when , Provide a variety of different ways of application transition effect . Include the following tools :
- stay CSS Automatic application in transition and animation class
- Can be used in conjunction with a third party CSS Animation library , Such as Animate.css
- Use... In the transition hook function JavaScript Direct manipulation DOM
- Can be used in conjunction with a third party JavaScript Animation library , Such as Velocity.js
In short, it's , You can use vue Of <transition></transition>
Components , combination css Animation animation
, transition transition
, perhaps javascript
operation dom To make your elements or components move . ad locum , We'll only talk about entering 、 Leave the transition with the list .
Principle of transition animation
Vue Provides transition
Package components of , In the following cases , You can add entry to any element or component / Leave the transition .
- Conditions apply colours to a drawing ( Use
v-if
) - Condition display ( Use
v-show
) - Dynamic components
- Component root
Scenario requirements
Use buttons to control the display of sub components ; Show and hide implementation fade out ( Animation ) The effect of ;
// css Set the transition effect
<style type="text/css">
.fade-enter,
.fade-leave-to {
opacity: 0;
}
.fade-enter-active,
.fade-leave-active {
transition: opacity 3s;
}
</style>
<div id="app">
<button type="button" @click="handleToggle"> Toggle display / hide </button>
<transition name="fade">
<child v-if="show"></child>
</transition>
</div>
Vue.component('child', {
template: `<div> Show or hide content </div>`
})
var vm = new Vue({
el: '#app',
data() {
return {
show: true
}
},
methods: {
handleToggle: function() {
this.show = !this.show // Control the explicit and implicit effects of components
}
}
})
Copy code
Principle analysis
-
<transition></transition>
Can wrap the content that needs to have an animation effect . -
In the transition into , There will be 3 individual class Handoff :
-
fade-enter
: Define the start state of transition . Takes effect before the element is inserted , Remove the next frame after the element is inserted . -
fade-enter-active
: Define the state when the transition takes effect . Apply... Throughout the transition , Takes effect before the element is inserted , In the transition / Remove... After animation . This class can be used to define the process time to enter the transition , Delay and curve functions . -
fade-enter-to
:2.1.8 Version and above Define the end state of transition . The next frame takes effect after the element is inserted ( meanwhilefade-enter
Removed ), In the transition / Remove... After animation .
- In the transition from , There will be 3 individual class Handoff :
fade-leave
: Define the start state of the exit transition . Takes effect immediately when the exit transition is triggered , The next frame is removed .fade-leave-active
: Define the state when the exit transition takes effect . Apply... Throughout the transition , Takes effect immediately when the exit transition is triggered , In the transition / Remove... After animation . This class can be used to define the process time of leaving the transition , Delay and curve functions .fade-leave-to
:2.1.8 Version and above Define the end state of the exit transition . The next frame takes effect after the departure transition is triggered ( meanwhilefade-leave
Be deleted ), In the transition / Remove... After animation .
- Above class by
fade
With the prefix oftransition
As defined inname='**'
Agreement , If you don't specify name, It will be added automaticallyv-
Prefix .- By CSS3 attribute
<transition>
Wrapped dom label , modifyv-if
orv-show
Command control display / Hide all with animation .
copyright notice
author[Not null],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2021/08/20210827085444267r.html
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