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具体内容如下
滑块验证组件整体不难,主要在于设置图片的样式问题,想要让背景图充满div,就需要滑块图片也跟随等比放大,效果与代码如下:
HTML:
<template> <section class="slider-section"> <div class="img-box"> <img :src="'data:image/png;base64,' + sliderData.bigImg" class="bg-img" ref="bgImg" /> <img :src="'data:image/png;base64,' + sliderData.smallImg" class="slider-img" ref="sliderImg" /> </div> <div class="slider-box"> <span class="slider-text">向右滑动滑块填充拼图</span> <div class="slider-icon" @mousedown="rangeMove">></div> </div> </section></template>
JS:
<script>export default { props: ['sliderData'], // 父组件传入的滑块数据对象 watch: { sliderData: { // 监听滑块数据变化,重置滑块位置 handler (newVal, oldVal) { if (newVal) { this.init() } }, deep: true } }, data () { return { disX: 0 // 滑块距离背景图左侧的位置 } }, mounted () { this.init() }, methods: { // 初始化滑块的位置 init () { this.disX = 0 // 初始化滑块位置 let bigImg = new Image() // 创建背景图片 bigImg.src = "data:image/png;base64," + this.sliderData.bigImg bigImg.onload = () => { let originWidth = bigImg.width // 获取原始背景图片的宽度 let widthRate = this.$refs.bgImg.width / originWidth // 背景图片渲染后的实际宽度/原始图片宽度 let smallImg = new Image() // 创建滑块图片 smallImg.src = "data:image/png;base64," + this.sliderData.smallImg this.$refs.sliderImg.src = 'data:image/png;base64,' + this.sliderData.smallImg // 设置滑块图片地址 this.$refs.sliderImg.style.width = smallImg.width * widthRate + 'px' // 设置滑块图片宽度 this.$refs.sliderImg.style.top = this.sliderData.smallY * this.$refs.bgImg.height + 'px' // 设置滑块距离背景图顶部的距离 this.$refs.sliderImg.style.left = 0 // 设置滑块距离背景图左侧的距离 } }, // 移动事件触发 rangeMove (e) { let ele = e.target let startX = e.clientX let eleWidth = ele.offsetWidth let parentWidth = ele.parentElement.offsetWidth let MaxX = parentWidth - eleWidth document.onmousemove = (e) => { let endX = e.clientX this.disX = endX - startX this.$refs.sliderImg.style.left = this.disX + 'px' if (this.disX <= 0) { this.disX = 0 this.$refs.sliderImg.style.left = 0 } if (this.disX >= MaxX - eleWidth) {//减去滑块的宽度,体验效果更好 this.disX = MaxX this.$refs.sliderImg.style.left = (parentWidth - this.$refs.sliderImg.width) + 'px' } ele.style.transition = '.1s all' ele.style.transform = 'translateX(' + this.disX + 'px)' e.preventDefault() } document.onmouseup = () => { this.$emit('submitPic', this.disX / parentWidth) // 停止滑动事件冒泡给父级 setTimeout(() => { ele.style.transition = '.5s all'; // 初始化滑块位置 ele.style.transform = 'translateX(0)'; }, 200) document.onmousemove = null document.onmouseup = null } } }}</script>
CSS:
<style scoped lang="less">.slider-section { margin: 20px 0; .img-box { position: relative; .bg-img { width: 100%; } .slider-img { position: absolute; left: 0; top: 0; } } .slider-box { margin-top: 20px; background: #f7f9fa; color: #666; border: 1px solid #e4e7eb; position: relative; height: 30px; width: 100%; &:hover { box-shadow: 0 0 3px #ccc; } .slider-text { font-size: 14px; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); } .slider-icon { width: 30px; height: 30px; background: #c8923a; text-align: center; font-size: 20px; color: #fff; box-shadow: 0 0 6px #ccc; } }}</style>
注:使用的是mousedown、onmousemove 、onmouseup 事件,仅支持PC端,如果要在移动端使用,需要把这些事件改成touch等;
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