vue實現滑塊拖拽校驗

這是我參與8月更文挑戰的第4天，活動詳情查看：8月更文挑戰 css

定義骨架，寫html和css

html部分html

<template>
    <div class="drag-wrapper" ref="dragDiv">
        <div class="drag_bg"></div>
        <div class="drag_text f14">{{ confirmWords }}</div>
        <!-- 移動的模塊 -->
        <div ref="moveDiv"
             @mousedown="mousedownFn($event)"
             :class="{'handler_ok_bg': confirmSuccess}"
             class="handler handler_bg"></div>
    </div>
</template>
複製代碼

css部分: 因爲擔憂圖片源的問題，因此寫成了base64的圖片web

<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>
複製代碼

實現滑動拖拽校驗

定義參數瀏覽器

data() {
    return {
        beginClientX:0,               // 距離屏幕左端距離
        mouseMoveStata:false,         // 觸發拖動狀態  判斷
        maxwidth:'',                  // 拖動最大寬度，依據滑塊寬度算出來的
        confirmWords:'拖動滑塊驗證',   // 滑塊文字
        confirmSuccess:false          // 驗證成功判斷
    }
}
複製代碼

1. 在mounted裏面，根據滑塊寬度計算可拖動最大寬度以及監聽手指的觸摸和離開事件

mounted() {
    // 根據滑塊寬度計算可拖動最大寬度
    this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
    // 監聽手指的觸摸事件
    document.getElementsByTagName('html')[0].addEventListener('mousemove', this.mouseMoveFn)
    // 監聽手指離開事件
    document.getElementsByTagName('html')[0].addEventListener('mouseup', this.moseUpFn)
}
複製代碼

2. 編寫手指滑動的事件和手指離開的事件

mousemove事件

首先判斷是否觸發拖動狀態,而後計算拖動的距離和模塊距離，實時賦值markdown

//驗證成功函數
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()
    }
},
複製代碼

mouseup事件

把拖動狀態改爲false，而且把滑塊移到對應的手指落下位置上app

moseUpFn(e) {
    this.mouseMoveState = !1                        // 修改狀態
    const width = e.clientX - this.beginClientX     // 計算獲取寬度
    if(width < this.maxwidth) {                     // 當寬度小於模塊的寬度時，賦值
        document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
        document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
    }
}
複製代碼

在上面html部分的handler塊裏，定義了mousedown事件(mousedownFn($event))函數

須要阻止文件選中等瀏覽器默認行爲，並把觸發拖動狀態這個閾值打開，記錄手指移動的距離post

mousedownFn:function (e) {
    e.preventDefault && e.preventDefault()   // 阻止文字選中等 瀏覽器默認事件
    this.mouseMoveStata = true               // 把觸發拖動狀態這個閾值打開
    this.beginClientX = e.clientX            // 記錄手指移動的距離
},
複製代碼

至此，功能就完成了。。ui

完整的JS代碼以下this

<script>
    export default {
        data(){
            return {
                beginClientX:0,           /*距離屏幕左端距離*/
                mouseMoveStata:false,     /*觸發拖動狀態  判斷*/
                maxwidth:'',               /*拖動最大寬度，依據滑塊寬度算出來的*/
                confirmWords:'拖動滑塊驗證',   /*滑塊文字*/
                confirmSuccess:false           /*驗證成功判斷*/
            }
        },
        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()   //阻止文字選中等 瀏覽器默認事件
                    this.mouseMoveStata = true
                    this.beginClientX = e.clientX
                }
            },
            //mousedoen 事件
            successFunction(){
                this.confirmSuccess = true
                this.confirmWords = '驗證經過'
                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'
            },
            //驗證成功函數
            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>
複製代碼

最後最後：

公衆號：小何成長，佛系更文，都是本身曾經踩過的坑或者是學到的東西

有興趣的小夥伴歡迎關注我哦，我是：何小玍。 你們一塊兒進步鴨