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vue实现折叠展开收缩动画效果

作者:ps酷教程

这篇文章主要介绍了vue实现折叠展开收缩动画,通过scrollHeight实现,本文通过实例代码给大家介绍的非常详细,感兴趣的朋友一起看看吧

学习链接

vue项目列表折叠面板动画效果实现
element-ui之el-collapse-transition(折叠展开动画)源码解析学习

通过scrollHeight实现

在这里插入图片描述

以下代码注意两点

<template>
    <div>
        <el-button plain type="danger" @click="toggleDiv" size="mini" style="margin-bottom: 10px;" >toggleDiv</el-button>
        <div class="box1" ref="box1" id="box1">
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
        </div>
    </div>
</template>
<script>
export default {
    name: 'Collapse',
    components: {
    },
    data() {
        return {
            isCollapse: false,
        }
    },
    mounted() {
        // 刚开始的时候, 就必须先获取到这个元素的高度(transition需要有两个数值才能产生过渡), 它必须刚开始就是可见的(不能display:none)
        console.log('mounted', this.$refs['box1'].scrollHeight);
        this.$refs['box1'].style.height = this.$refs['box1'].scrollHeight + 'px'
    },
    methods: {
        toggleDiv() {
            this.isCollapse = !this.isCollapse
            if(this.isCollapse) {
                this.$refs['box1'].style.height = 0
            } else {
                // 这个时候,box1已经收缩了,但是需要展开,那就必须获取到它的高度(此时它的style的height为0)
                console.log( this.$refs['box1'].scrollHeight);
                this.$refs['box1'].style.height = this.$refs['box1'].scrollHeight + 'px'
            }
        }
    }
}
</script>
<style>
.box1 {
    width: 200px;
    /* height: 200px; */
    background-color: #bfa;
    transition: height 0.28s;
    overflow: hidden;
}
.box1 .box1-item {
    height: 20px;
    border: 1px solid red;
}
</style>

通过js获取auto时的高度去实现(效果不好)

虽然,实现效果并不怎么好,但是比较巧妙,它通过js设置height为auto,然后就可以获取元素的自然高度。这种获取高度的方式可以借鉴下

<template>
    <div>
        <el-button plain type="danger" @click="toggleDiv" size="mini" style="margin-bottom: 10px;" >toggleDiv</el-button>
        <div class="box1" ref="box1" id="box1">
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
        </div>
    </div>
</template>
<script>
export default {
    name: 'Collapse',
    components: {
    },
    data() {
        return {
            isCollapse: false,
        }
    },
    mounted() {
        console.log(this.$refs['box1'].scrollHeight); // 110
        this.$refs['box1'].style.height = 'auto'
        this.$refs['box1'].style.height = window.getComputedStyle(this.$refs['box1']).height
    },
    methods: {
        toggleDiv() {
            this.isCollapse = !this.isCollapse
            if(this.isCollapse) {
                this.$refs['box1'].style.height = 0
            } else {
                this.$refs['box1'].style.height = 'auto'
                let height = window.getComputedStyle(this.$refs['box1']).height
                // 这里修改的太快,transition都还没开始做动画
                this.$refs['box1'].style.height = 0
                this.$refs['box1'].style.height = height
            }
        }
    }
}
</script>
<style>
.box1 {
    width: 200px;
    background-color: #bfa;
    overflow: hidden;
}
.box1 .box1-item {
    height: 20px;
    border: 1px solid red;
}
</style>

优化

要使用setTimeout,才能在展开的时候,有过渡效果,不然两个修改高度的js在一起,它是不会有过渡的,可能跟浏览器的渲染有关系

<template>
    <div>
        <el-button plain type="danger" @click="toggleDiv" size="mini" style="margin-bottom: 10px;" >toggleDiv</el-button>
        <div class="box1" ref="box1" id="box1">
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
            <div class="box1-item"></div>
        </div>
    </div>
</template>
<script>
export default {
    name: 'Collapse',
    components: {
    },
    data() {
        return {
            isCollapse: false,
            styleObj: {}
        }
    },
    mounted() {
        console.log(this.$refs['box1'].scrollHeight); // 110
        this.$refs['box1'].style.height = 'auto'
        this.$refs['box1'].style.height = window.getComputedStyle(this.$refs['box1']).height
    },
    methods: {
        toggleDiv() {
            this.isCollapse = !this.isCollapse
            if(this.isCollapse) {
                this.$refs['box1'].style.height = 0
            } else {
                this.$refs['box1'].style.height = 'auto'
                let height = window.getComputedStyle(this.$refs['box1']).height
                console.log(height,1);
                this.$refs['box1'].style.height = 0
                setTimeout(()=> {
                    this.$refs['box1'].style.height = height
                })
            }
        }
    }
}
</script>
<style>
.box1 {
    width: 200px;
    background-color: #bfa;
    overflow: hidden;
    transition: all 0.5s;
}
.box1 .box1-item {
    height: 20px;
    border: 1px solid red;
}
</style>

通过grid实现

注意下面的grid网格布局是加给外面的这个容器,外面这个容器从0fr到1fr会产生动画。overflow:hidden是加给里面的这个div。这样就能实现从0->auto的高度变化过渡效果。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            margin: 0;
        }
        .quick-example {
            margin: 1rem;
            padding: 1rem;
            background: hsl(200, 50%, 50% );
            border-radius: 0.5rem;
            display: grid;
            grid-template-rows: 0fr;
            transition: grid-template-rows 0.5s;
        }
        .quick-example>div {
            overflow: hidden;
        }
        .quick-example:hover {
            grid-template-rows: 1fr;
        }
    </style>
</head>
<body>
    <div class="quick-example">
        <div>
            this is amazing!
            this is amazing!
            this is amazing!
            this is amazing!
            this is amazing!
            this is amazing!
            this is amazing!
            this is amazing!
        </div>
    </div>
    <div>
    	[一段很长的文字Lorem1000]
    </div>
</body>
</html>

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