vue做的電子簽名

前段時間,做了一個電子簽名的功能:

我們的項目是要求是在一個url下面進行繪制,然后跳入另一個url的頁面進行回顯,即顯示的頁面和繪制的是兩個不同的url;

繪制的電子簽名的頁面:(貼出來關鍵性的代碼)

HTML:的代碼(兼容pc單的鼠標事件及移動端的touch事件

 

js的:

export default {
  data() {
    return {
      stageInfo:'',
      imgUrl:'',
      client: {},
      points: [],
      canvasTxt: null,
      startX: 0,
      startY: 0,
      moveY: 0,
      moveX: 0,
      endY: 0,
      endX: 0,
      w: null,
      h: null,
      isDown: false,
      isViewAutograph: this.$route.query.isViews > 0,
      contractSuccess: this.$route.query.contractSuccess
    }
  },
  methods: {
    //mobile
    touchStart(ev) {
      ev = ev || event
      ev.preventDefault()
      if (ev.touches.length == 1) {
        let obj = {
          x: ev.targetTouches[0].clienX,
          y: ev.targetTouches[0].clientY,
        }
        this.startX = obj.x
        this.startY = obj.y
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
      }
    },
    touchMove(ev) {
      ev = ev || event
      ev.preventDefault()
      if (ev.touches.length == 1) {
        let obj = {
          x: ev.targetTouches[0].clientX - this.stageInfo.left,
          y: ev.targetTouches[0].clientY - this.stageInfo.top
        }
        this.moveY = obj.y
        this.moveX = obj.x
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.startY = obj.y
        this.startX = obj.x
        this.points.push(obj)
      }
    },
    touchEnd(ev) {
      ev = ev || event
      ev.preventDefault()
      if (ev.touches.length == 1) {
        let obj = {
          x: ev.targetTouches[0].clientX - this.stageInfo.left,
          y: ev.targetTouches[0].clientY - this.stageInfo.top
        }
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
      }
    },
    //pc
    mouseDown(ev) {
      ev = ev || event
      ev.preventDefault()
      if (1) {
        let obj = {
          x: ev.offsetX,
          y: ev.offsetY
        }
        this.startX = obj.x
        this.startY = obj.y
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
        this.isDown = true
      }
    },
    mouseMove(ev) {
      ev = ev || event
      ev.preventDefault()
      if (this.isDown) {
        let obj = {
          x: ev.offsetX,
          y: ev.offsetY
        }
        this.moveY = obj.y
        this.moveX = obj.x
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.startY = obj.y
        this.startX = obj.x
        this.points.push(obj)
      }
    },
    mouseUp(ev) {
      ev = ev || event
      ev.preventDefault()
      if (1) {
        let obj = {
          x: ev.offsetX,
          y: ev.offsetY
        }
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
        this.points.push({x: -1, y: -1})
        this.isDown = false
      }
    },
    //重寫
    overwrite() {
      this.canvasTxt.clearRect(0, 0, this.$refs.canvasF.width, this.$refs.canvasF.height)
      this.points = []
    },
  },
  mounted() {
    let _this = this;
    let canvas = this.$refs.canvasF
    canvas.height = window.screen.availHeight-150;//獲取畫布的高度
    canvas.width = window.screen.availWidth-50;//獲取畫布的寬度
    _this.canvasTxt = canvas.getContext('2d');//canvas的初始化
    _this.stageInfo = canvas.getBoundingClientRect();  //getBoundingClientRect()可以不用考慮兼容性
  },
  
}
//獲取繪制的base64Data

this.$refs.canvasF.toDataURL();
將這個值傳給另一個Url,在組件銷毀之前,將值傳出去

beforeDestroy () {
  Bus.$emit("setSignature",this.$refs.canvasF.toDataURL());
},

另一個url接受參數的過程

created(){
  Bus.$on("setSignature", content =>{
    this.signatureUrl = content;
  })
},
beforeDestroy () {
  Bus.$off('setSignature');
}

這樣這個過程就可以實現了