17css动画

1.过渡

<style>
    /* 1.当显示动画开始时,会添加fade-enter和fade-enter-active
        当动画第一帧结束,运行到第二帧的时候,会删除掉fade-enter,添加fade-enter-to
        执行到结束,会把fade-enter-active和fade-enter-to去掉
        注意:样式开头都为fade是因为我们给transition取名为fade

        2.当在隐藏开始的时候,会添加fade-leave和fade-leave-active
        当动画第一帧结束,运行到第二帧的时候,会删除掉fade-leave,添加fade-leave-to
        执行到结束,会把fade-leave-active和fade-leave-to去掉
     */
    .fade-enter,
    .fade-leave-to{
        opacity: 0;
    }
    .fade-enter-active,
    .fade-leave-active{
        transition: opacity 3s;
    }
</style>
<body>
    <div id="root">
        <!-- 这个名字可以随便取 -->
        <transition name="fade">
        <div v-if="show">hello world</div>
        </transition>
        <button @click="handleChange">切换</button>
    </div>
    
</body>
<script>
    var vm=new Vue({
        el:'#root',
        data:{
            type:"child-one",
            show:true
        },
        methods:{
            handleChange:function(){
                this.show=!this.show;
            }
        }
    })
</script>

 

2.自定义类名

  • enter-class
  • enter-active-class
  • enter-to-class (2.1.8+)
  • leave-class
  • leave-active-class
  • leave-to-class (2.1.8+)
<style>
    @keyframes bounce-in{
        0%{
            transform: scale(0);
        }
        50%{
            transform: scale(1.5);
        }
        100%{
            transform: scale(1);
        }
    }
    .active{
        transform-origin: left center;
        animation: bounce-in 1s;
    }
    .leave{
        transform-origin: left center;
        animation: bounce-in 1s reverse;
    }
</style>
<body>
    <div id="root">
        <!-- 自定义类名 -->
        <transition name="fade" enter-active-class="active" leave-active-class="leave">
        <div v-if="show">hello world</div>
        </transition>
        <button @click="handleChange">切换</button>
    </div>
    
</body>

 

3.使用animate.css

https://animate.style/

<link
    rel="stylesheet"
    href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css"
  />
<body>
    <div id="root">
        <!-- 自定义类名 -->
        <transition name="fade" enter-active-class="animate__animated animate__wobble" leave-active-class="animate__animated animate__rubberBand">
        <div v-if="show">hello world</div>
        </transition>
        <button @click="handleChange">切换</button>
    </div>
    
</body>

 

4.元素第一次显示的动画效果,添加appear,appear-active-class

<transition 
        name="fade" 
        appear
        appear-active-class="animate__animated animate__wobble"
        enter-active-class="animate__animated animate__wobble" 
        leave-active-class="animate__animated animate__rubberBand"
        >
        <div v-if="show">hello world</div>
        </transition>

 

5.同时使用过渡和动画

在自定义类中加入类名

<style>
    .fade-enter,
    .fade-leave-to{
        opacity: 0;
    }
    .fade-enter-active,
    .fade-leave-active{
        transition: opacity 3s;
    }

    
</style>
<body>
    <div id="root">
        <!-- 自定义类名 -->
        <transition 
        name="fade" 
        appear
        appear-active-class="animate__animated animate__wobble"
        enter-active-class="animate__animated animate__wobble fade-enter-active" 
        leave-active-class="animate__animated animate__rubberBand fade-leave-active"
        >
        <div v-if="show">hello world</div>
        </transition>
        <button @click="handleChange">切换</button>
    </div>
    
</body>

 

当自己写的样式过渡时间(3s)和animate.css过渡时间(默认1s)有冲突时,可以自己设置时间

  <transition 
        type="transition"
        name="fade" 
        appear
        appear-active-class="animate__animated animate__wobble"
        enter-active-class="animate__animated animate__wobble fade-enter-active" 
        leave-active-class="animate__animated animate__rubberBand fade-leave-active"
        >
        <div v-if="show">hello world</div>
        </transition>

type="transition"的意思时说当有animate设置的时长和transition设置的时长时,以transition的时长为准。

 

6.我们还可以控制类消失的时间,

:duration
<transition 
        :duration="5000"
        name="fade" 
        appear
        appear-active-class="animate__animated animate__wobble"
        enter-active-class="animate__animated animate__wobble fade-enter-active" 
        leave-active-class="animate__animated animate__rubberBand fade-leave-active"
        >

当动画在1秒执行完毕后,在dom节点上,类名比如:animate__animated animate__wobble fade-enter-active会等到5秒后才会被替换为其它。

 

7.javascript钩子

<transition
  v-on:before-enter="beforeEnter"
  v-on:enter="enter"
  v-on:after-enter="afterEnter"
  v-on:enter-cancelled="enterCancelled"

  v-on:before-leave="beforeLeave"
  v-on:leave="leave"
  v-on:after-leave="afterLeave"
  v-on:leave-cancelled="leaveCancelled"
>
  <!-- ... -->
</transition>
methods: {
  // --------
  // 进入中
  // --------

  beforeEnter: function (el) {
    // ...
  },
  // 当与 CSS 结合使用时
  // 回调函数 done 是可选的
  enter: function (el, done) {
    // ...
    done()
  },
  afterEnter: function (el) {
    // ...
  },
  enterCancelled: function (el) {
    // ...
  },

  // --------
  // 离开时
  // --------

  beforeLeave: function (el) {
    // ...
  },
  // 当与 CSS 结合使用时
  // 回调函数 done 是可选的
  leave: function (el, done) {
    // ...
    done()
  },
  afterLeave: function (el) {
    // ...
  },
  // leaveCancelled 只用于 v-show 中
  leaveCancelled: function (el) {
    // ...
  }
}

例子:元素在显示的时候由红色便绿,再变黑

<body>
    <div id="root">
        <transition 
        name="fade"
        @before-enter="handleBeforeEnter"
        @enter="enter"
        @after-enter="handleAfterEnter"
        >
        <div v-if="show">hello world</div>
        </transition>
        <button @click="handleChange">切换</button>
    </div>
    
</body>
<script>
    var vm=new Vue({
        el:'#root',
        data:{
            type:"child-one",
            show:true
        },
        methods:{
            handleChange:function(){
                this.show=!this.show;
            },
            handleBeforeEnter:function(el){
                //在元素进入的一瞬间执行
                console.log("进入")
                el.style.color='red'
            },
            enter:function(el,done){
                //handleBeforeEnter结束
                setTimeout(()=>{
                    el.style.color='green'  
                },2000)

                setTimeout(()=>{
                    done()//告诉vue done执行完了
                },4000)
            },
            handleAfterEnter:function(el){
                el.style.color='#000'
            }
        }
    })
</script>

 

8.js使用的动画库,velocity.js

<script src="https://cdnjs.cloudflare.com/ajax/libs/velocity/1.5.0/velocity.min.js"></script>
 methods:{
            handleChange:function(){
                this.show=!this.show;
            },
            handleBeforeEnter:function(el){
               el.style.opacity=0;
            },
            enter:function(el,done){
                //Velocity执行完这个函数后就会执行complete
                //Velocity 接收一组 css 属性键值对 (css map) 作为它的第一个参数,该参数作为动画效果的最终属性。第二个参数是可选参数 为动画的额外配置项。
                Velocity(el,{opacity:1},{duration:1000,complete:done})
            },
            handleAfterEnter:function(el){
                
            }
        }

 

9.多个元素的过渡动画

<style>
    .fade-enter,
    .fade-leave-to{
        opacity: 0;
    }
    .fade-enter-active,
    .fade-leave-active{
        transition: opacity 1s;
    }

</style>
<body>
    <div id="root">
        <transition 
            name="fade"
        >
        <!-- 加key值避免复用元素,导致过渡动画失效 -->
        <div v-if="show" key='hello'>hello world</div>
        <div v-else key='bey'>bey world</div>
        </transition>
        <button @click="handleChange">切换</button>
    </div>
    
</body>

 

10.设置过渡模式

同时生效的进入和离开的过渡不能满足所有要求,所以 Vue 提供了过渡模式

  • in-out:新元素先进行过渡,完成之后当前元素过渡离开。

  • out-in:当前元素先进行过渡,完成之后新元素过渡进入。

<transition name="fade" mode="out-in">
  <!-- ... the buttons ... -->
</transition>

 

posted @ 2020-12-19 23:34  ellenxx  阅读(487)  评论(0编辑  收藏  举报