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Vue在H5中使用签名组件，可以横屏

Vue在H5中使用签名组件，可以横屏

作者: 回到唐朝做IT | 来源:发表于2023-07-27 10:24 被阅读0次
image.png image.png
1、安装插件
npm i vue-ele-sign
2、封装sign.vue组件
<template>
  <van-action-sheet v-model:show="show" :title="!showBig ? '签名' : ''" :class="showBig ? 'aa' : ''">
    <div class="big" v-if="!showBig">
    <div class="tips1"><van-icon name="warning"  class="tips1-icon"/>使用正楷在框内签署您的名字即可完成签字</div>
    <div class="tips2">{{`请在下面签字`}}</div>
      <vue-ele-sign ref="VueEleSign" color="#000000" :lineWidth="8"  class="xxx" />
      <div class="clear_box">
        <img src="@/assets/images/clear.png" @click="clearIt" class="clear_icon" alt="" />
      </div>
      <img src="@/assets/images/big.png" @click="bigIt" class="bigit" alt="" />
      <div class="button_list">
        <div class="cancel" @click="cancelIt">返回</div>
        <div class="ok" @click="sureIt">确认签署</div>
      </div>
    </div>
    <div class="all_big" v-else>
      <vue-ele-sign ref="VueEleSignBig" color="#000000" :lineWidth="8" class="all_big" />
      <img src="@/assets/images/clear.png" @click="clearBigIt" class="clear_icon_big" alt="" />
      <div class="big_list">
        <div class="cancel" @click="cancelIt">返回</div>
        <div class="ok" @click="sureIt1">确认签署</div>
      </div>
    </div>
  </van-action-sheet>
</template>

<script>
import VueEleSign from 'vue-ele-sign'
import { uploadBase64 } from '@/api/user.js'
export default {
  props: {
    signItem: {
      type: Object,
      default: () => {}
    }
  },
  data() {
    return {
      show: false,
      showBig: false,
      bindPrintValue: ''
    }
  },
  components: {
    VueEleSign
  },
  mounted() {
  },

  methods: {
    bigIt() {
      this.showBig = true
    },
    showIt() {
      this.show = true
      this.showBig = false
      this.clearIt()
    },
    clearIt() {
      this.$refs.VueEleSign && this.$refs.VueEleSign.clear()
    },
    clearBigIt() {
      this.$refs.VueEleSignBig && this.$refs.VueEleSignBig.clear()
    },
    cancelIt() {
      this.show = false
    },
    sureIt() {
      if (this.$refs.VueEleSign.isEmpty()) {
        this.$Toast({
          message: '请签名'
        })
      } else {
        const data = this.$refs.VueEleSign.toPng()
        const base64String = data.replace('data:image/png;base64,', '')
        uploadBase64({
          base64String,
          fileName: new Date().getTime() + '.png'
        }).then(res => {
          const sendData = {
            signCode: this.signItem.code,
            bindValue: res.data,
            showImgValue: data

          }
          if (this.signItem.type === 'SignatureDate') {
            sendData.signDateTime = new Date().getTime()
            sendData.type = this.signItem.type
            sendData.signatureType = this.signItem.signatureType
          }
          this.$emit('signOk', sendData)
        })
        this.cancelIt()
      }
    },
    sureIt1() {
      if (this.$refs.VueEleSignBig.isEmpty()) {
        this.$Toast({
          message: '请签名'
        })
      } else {
        const data = this.$refs.VueEleSignBig.toPng()
        this.rotateBase64Img(data, 270, re => {
          const base64String = re.replace('data:image/png;base64,', '')
          uploadBase64({
            base64String,
            fileName: new Date().getTime() + '.png'
          }).then(res => {
            const sendData = {
              signCode: this.signItem.code,
              bindValue: res.data,
              showImgValue: data

            }
            if (this.signItem.type === 'SignatureDate') {
              sendData.signDateTime = new Date().getTime()
              sendData.type = this.signItem.type
              sendData.signatureType = this.signItem.signatureType
            }
            this.$emit('signOk', sendData)
          })
          this.cancelIt()
        })
      }
    },
    rotateBase64Img(src, edg, callback) {
      var canvas = document.createElement('canvas')
      var ctx = canvas.getContext('2d')

      var imgW // 图片宽度
      var imgH // 图片高度
      var size // canvas初始大小

      if (edg % 90 != 0) {
        console.error('旋转角度必须是90的倍数!')
        throw '旋转角度必须是90的倍数!'
      }
      edg < 0 && (edg = (edg % 360) + 360)
      const quadrant = (edg / 90) % 4 // 旋转象限
      const cutCoor = { sx: 0, sy: 0, ex: 0, ey: 0 } // 裁剪坐标

      var image = new Image()
      image.crossOrigin = 'anonymous'
      image.src = src

      image.onload = function() {
        imgW = image.width
        imgH = image.height
        size = imgW > imgH ? imgW : imgH

        canvas.width = size * 2
        canvas.height = size * 2
        switch (quadrant) {
          case 0:
            cutCoor.sx = size
            cutCoor.sy = size
            cutCoor.ex = size + imgW
            cutCoor.ey = size + imgH
            break
          case 1:
            cutCoor.sx = size - imgH
            cutCoor.sy = size
            cutCoor.ex = size
            cutCoor.ey = size + imgW
            break
          case 2:
            cutCoor.sx = size - imgW
            cutCoor.sy = size - imgH
            cutCoor.ex = size
            cutCoor.ey = size
            break
          case 3:
            cutCoor.sx = size
            cutCoor.sy = size - imgW
            cutCoor.ex = size + imgH
            cutCoor.ey = size + imgW
            break
        }

        ctx.translate(size, size)
        ctx.rotate((edg * Math.PI) / 180)
        ctx.drawImage(image, 0, 0)

        var imgData = ctx.getImageData(cutCoor.sx, cutCoor.sy, cutCoor.ex, cutCoor.ey)
        if (quadrant % 2 == 0) {
          canvas.width = imgW
          canvas.height = imgH
        } else {
          canvas.width = imgH
          canvas.height = imgW
        }
        ctx.putImageData(imgData, 0, 0)
        callback(canvas.toDataURL())
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.xxx {
  width: 100%;
  height: 300px;
  background: #f1f1f1;
  border-top: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
}
.big {
  width: 100%;
  height: 500px;
  position: relative;
  .tips1{
    color:#4284F5;
    font-size: 12px;
    margin-bottom:8px;
    font-family:'PingFangSC-Regular';
    padding-left:16px;
    .tips1-icon{
      margin-right:6px;
    }
  }
  .tips2{
    color:#323233;
    font-size: 14px;
    font-family:'PingFang SC';
    padding-left:16px;
  }
}
.bigit {
  position: absolute;
  right: 20px;
  top: 65px;
  z-index: 888888;
  height: 16px;
  width: 16px;
}
.button_list {
  display: flex;
  position: fixed;
  bottom: 50px;
  width: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 0 16px;
  box-sizing: border-box;
  align-items: center;
  justify-content: space-between;

  .cancel {
    border-radius: 20px;
    margin-right: 5px;
    height: 40px;
    flex: 1;
    background: #f1f1f1;
    border: 1px solid #fda21d;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'PingFangSC-Regular';
    font-weight: 400;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    color: #fda21d;
  }
  .ok {
    flex: 1;
    border-radius: 20px;
    margin-left: 5px;
    height: 40px;
    background: #fda21d;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'PingFangSC-Regular';
    font-weight: 400;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    color: #fff;
  }
}
.clear_box {
  display: flex;
  width: 100%;
  justify-content: flex-end;
  .clear_icon {
    height: 30px;
    width: 30px;
    margin: 10px 30px 0 0;
  }
}
.all_big {
  height: 100vh;
  width: 100%;
  background: #f1f1f1;
  position: relative;
}
.aa {
  height: 100%;
  max-height: 100%;
  border-radius: 0;
}
.big_list {
  transform: rotate(90deg);
  position: absolute;
  left: -100px;
  width: 300px;
  height: 40px;
  top: 50%;
  display: flex;
  .cancel {
    border-radius: 20px;
    margin-right: 5px;
    height: 40px;
    flex: 1;
    background: #f1f1f1;
    border: 1px solid #fda21d;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'PingFangSC-Regular';
    font-weight: 400;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    color: #fda21d;
  }
  .ok {
    flex: 1;
    border-radius: 20px;
    margin-left: 5px;
    height: 40px;
    background: #fda21d;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'PingFangSC-Regular';
    font-weight: 400;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    color: #fff;
  }
}
.clear_icon_big {
  position: absolute;
  height: 30px;
  width: 30px;
  right: 20px;
  bottom: 20px;
  transform: rotate(90deg);
}
</style>

3、使用

<template>
  <!-- 电子签名 -->
    <sign ref="sign" :signItem="signItem" @signOk="signOk"></sign>
</template>
<script>
import sign from '@/components/sign.vue'
data(){
  return{
    signItem:{}
  }
},
methods:{
  // 签名
    handleSignature(item) 
        this.signItem = item
        this.$refs.sign.showIt()
    },
    signOk(obj) {
      //返回数据obj
    }
}
</script>

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