vue实现滑块拖拽校验功能的全过程

效果图

定义骨架，写html和css

html部分

<template>
    <div class="drag-wrapper" ref="dragDiv">
        <div class="drag_bg"></div>
        <div class="drag_text f14">{{ confirmWords }}</div>
        <!-- 移动的模块 -->
        <div ref="moveDiv"
             @mousedown="mousedownFn($event)"
             :class="{'handler_ok_bg': confirmSuccess}"
             class="handler handler_bg"></div>
    </div>
</template>

css部分: 由于担心图片源的问题，所以写成了base64的图片

<style scoped>
    .drag{
        position: relative;
        background-color: #e8e8e8;
        width: 100%;
        height: 40px;
        line-height: 40px;
        text-align: center;
    }
    .handler{
        width: 40px;
        height: 40px;
        border: 1px solid #ccc;
        cursor: move;
        position: absolute;top: 0px;left: 0px;
    }
    .handler_bg{
        background: #fff url("data:image/png;base64,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") no-repeat center;
    }
    .handler_ok_bg{
        background: #fff url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA3hpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDIxIDc5LjE1NTc3MiwgMjAxNC8wMS8xMy0xOTo0NDowMCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDo0ZDhlNWY5My05NmI0LTRlNWQtOGFjYi03ZTY4OGYyMTU2ZTYiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6NDlBRDI3NjVGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6NDlBRDI3NjRGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIDIwMTQgKE1hY2ludG9zaCkiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDphNWEzMWNhMC1hYmViLTQxNWEtYTEwZS04Y2U5NzRlN2Q4YTEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6NGQ4ZTVmOTMtOTZiNC00ZTVkLThhY2ItN2U2ODhmMjE1NmU2Ii8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+k+sHwwAAASZJREFUeNpi/P//PwMyKD8uZw+kUoDYEYgloMIvgHg/EM/ptHx0EFk9I8wAoEZ+IDUPiIMY8IN1QJwENOgj3ACo5gNAbMBAHLgAxA4gQ5igAnNJ0MwAVTsX7IKyY7L2UNuJAf+AmAmJ78AEDTBiwGYg5gbifCSxFCZoaBMCy4A4GOjnH0D6DpK4IxNSVIHAfSDOAeLraJrjgJp/AwPbHMhejiQnwYRmUzNQ4VQgDQqXK0ia/0I17wJiPmQNTNBEAgMlQIWiQA2vgWw7QppBekGxsAjIiEUSBNnsBDWEAY9mEFgMMgBk00E0iZtA7AHEctDQ58MRuA6wlLgGFMoMpIG1QFeGwAIxGZo8GUhIysmwQGSAZgwHaEZhICIzOaBkJkqyM0CAAQDGx279Jf50AAAAAABJRU5ErkJggg==") no-repeat center;
    }
    .drag_bg{
        background-color: #7ac23c;
        height: 40px;
        width: 0px;
    }
    .drag_text{
        position: absolute;
        top: 0px;
        width: 100%;text-align: center;
        -moz-user-select: none;
        -webkit-user-select: none;
        user-select: none;
        -o-user-select:none;
        -ms-user-select:none;
    }
</style>

实现滑动拖拽校验

定义参数

data() {
    return {
        beginClientX:0,               // 距离屏幕左端距离
        mouseMoveStata:false,         // 触发拖动状态  判断
        maxwidth:'',                  // 拖动最大宽度，依据滑块宽度算出来的
        confirmWords:'拖动滑块验证',   // 滑块文字
        confirmSuccess:false          // 验证成功判断
    }
}

1. 在mounted里面，根据滑块宽度计算可拖动最大宽度以及监听手指的触摸和离开事件

mounted() {
    // 根据滑块宽度计算可拖动最大宽度
    this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
    // 监听手指的触摸事件
    document.getElementsByTagName('html')[0].addEventListener('mousemove', this.mouseMoveFn)
    // 监听手指离开事件
    document.getElementsByTagName('html')[0].addEventListener('mouseup', this.moseUpFn)
}

2. 编写手指滑动的事件和手指离开的事件

mousemove事件

首先判断是否触发拖动状态,然后计算拖动的距离和模块距离，实时赋值

//验证成功函数
mouseMoveFn(e){
    if(this.mouseMoveStata){
        let width = e.clientX - this.beginClientX
        if(width > 0 && width <= this.maxwidth) {
            document.getElementsByClassName('handler')[0].style.left = width + 'px'
            document.getElementsByClassName('drag_bg')[0].style.width = width + 'px'
        }else if(width > this.maxwidth) this.successFunction()
    }
},

mouseup事件

把拖动状态改成false，并且把滑块移到对应的手指落下位置上

moseUpFn(e) {
    this.mouseMoveState = !1                        // 修改状态
    const width = e.clientX - this.beginClientX     // 计算获取宽度
    if(width < this.maxwidth) {                     // 当宽度小于模块的宽度时，赋值
        document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
        document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
    }
}

在上面html部分的handler块里，定义了mousedown事件(mousedownFn($event))

需要阻止文件选中等浏览器默认行为，并把触发拖动状态这个阈值打开，记录手指移动的距离

mousedownFn:function (e) {
    e.preventDefault && e.preventDefault()   // 阻止文字选中等 浏览器默认事件
    this.mouseMoveStata = true               // 把触发拖动状态这个阈值打开
    this.beginClientX = e.clientX            // 记录手指移动的距离
},

至此，功能就完成了。。

完整的JS代码如下

<script>
    export default {
        data(){
            return {
                beginClientX:0,           /*距离屏幕左端距离*/
                mouseMoveStata:false,     /*触发拖动状态  判断*/
                maxwidth:'',               /*拖动最大宽度，依据滑块宽度算出来的*/
                confirmWords:'拖动滑块验证',   /*滑块文字*/
                confirmSuccess:false           /*验证成功判断*/
            }
        },
        mounted(){
            this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
            document.getElementsByTagName('html')[0].addEventListener('mousemove',this.mouseMoveFn)
            document.getElementsByTagName('html')[0].addEventListener('mouseup',this.moseUpFn)
        },
        methods: {
            mousedownFn:function (e) {
                if(!this.confirmSuccess){
                    e.preventDefault && e.preventDefault()   //阻止文字选中等 浏览器默认事件
                    this.mouseMoveStata = true
                    this.beginClientX = e.clientX
                }
            },
            //mousedoen 事件
            successFunction(){
                this.confirmSuccess = true
                this.confirmWords = '验证通过'
                this.$emit('onValidation', true)
                if(window.addEventListener){
                    document.getElementsByTagName('html')[0].removeEventListener('mousemove',this.mouseMoveFn)
                    document.getElementsByTagName('html')[0].removeEventListener('mouseup',this.moseUpFn)
                }else document.getElementsByTagName('html')[0].removeEventListener('mouseup',()=>{})
                document.getElementsByClassName('drag_text')[0].style.color = '#fff'
                document.getElementsByClassName('handler')[0].style.left = this.maxwidth + 'px'
                document.getElementsByClassName('drag_bg')[0].style.width = this.maxwidth + 'px'
            },
            //验证成功函数
            mouseMoveFn(e){
                if(this.mouseMoveStata){
                    let width = e.clientX - this.beginClientX
                    if(width > 0 && width <= this.maxwidth) {
                        document.getElementsByClassName('handler')[0].style.left = width + 'px'
                        document.getElementsByClassName('drag_bg')[0].style.width = width + 'px'
                    }else if(width > this.maxwidth) this.successFunction()
                }
            },
            //mousemove事件
            moseUpFn(e){
                this.mouseMoveStata = false
                var width = e.clientX - this.beginClientX
                if(width<this.maxwidth){
                    document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
                    document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
                }
            }
        }
    }
</script>

总结

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