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vue vue-esign签字板demo

使用vue-esign让用户能够在手动签字并返回为base64或者file格式的文件流

安装

npm install vue-esign --save

在main.js中全局引用

import vueEsign from 'vue-esign'
Vue.use(vueEsign)

Demo

<template>
 <div class="esigns">
  <vue-esign
   ref="esign"
   style="
    width: 100%;
    height: 400px
   "
   :isCrop="isCrop"
   :lineWidth="lineWidth"
   :lineColor="lineColor"
   :bgColor.sync="bgColor"
  />
  <div class="btn">
   <van-button type="primary" @click="handleReset">重置</van-button>
   <van-button type="info" @click="handleGenerate">确定</van-button>
  </div>
 </div>
</template>

<script>
export default {
 name: "Esign",
 data() {
  return {
   lineWidth: 6,
   lineColor: "#000000",
   bgColor: "",
   resultImg: "",
   isCrop: false,
  };
 },
 methods: {
  handleReset() {
   // 清除
   this.$refs.esign.reset();
  },
  handleGenerate() {
   // 获取base64
   var _this = this;
   _this.$refs.esign
    .generate()
    .then((res) => {
     // 转成文件
     var file = _this.dataURLtoFile(res);
      console.log("file:",file )
     //调用接口
     uploadFile(file).then(({ data }) => {
     console.log("data:",data)
     });
    })
    .catch((err) => {
     _this.$toast(err);
    });
  },
  // 将base64转换为file
  dataURLtoFile(dataurl) {
   let arr = dataurl.split(",");
   let mime = arr[0].match(/:(.*);/)[1];
   let bytes = atob(arr[1]); // 解码base64
   let n = bytes.length;
   let ia = new Uint8Array(n);
   while (n--) {
    ia[n] = bytes.charCodeAt(n);
   }
   return new File([ia], "easign.jpg", { type: mime });
  },
 },
};
</script>

<style scoped>
.btn {
 display: flex;
 justify-content: space-around;
 margin-top: 10px;
}
</style>

vue移动端电子签名demo

HTML

<template>
 <div id='canvasBox'>
  <div ref="canvasBox">
     <canvas id="canvas" ref="canvas" height="150"></canvas>
  </div>
  <div class="row row-space-between">
   <button @click="onClickCancle">取消</button>
   <button @click="clear">重签</button>
   <button @click="save">确认</button>
  </div>
  <!-- <img :src="singImgUrl" alt /> -->
 </div>
</template>

JS相关代码

<script>
var draw;
var preHandler = function(e) {
  e.preventDefault();
};
class Draw {
  constructor(el) {
    this.el = el;
    this.canvas = document.getElementById(this.el);
    this.cxt = this.canvas.getContext("2d");
    this.stage_info = canvas.getBoundingClientRect();
    this.path = {
      beginX: 0,
      beginY: 0,
      endX: 0,
      endY: 0
    };
  }
  init(btn) {
    var that = this;
    this.canvas.addEventListener("touchstart", function(event) {
      document.addEventListener("touchstart", preHandler, false);
      that.drawBegin(event);
    });
    this.canvas.addEventListener("touchend", function(event) {
      document.addEventListener("touchend", preHandler, false);
      that.drawEnd();
    });
    this.clear(btn);
  }
  drawBegin(e) {
    var that = this;
    window.getSelection()
       window.getSelection().removeAllRanges()
      : document.selection.empty();
    this.cxt.strokeStyle = "#BC4C2D";
    this.cxt.beginPath();
    this.cxt.moveTo(
      e.changedTouches[0].clientX - this.stage_info.left,
      e.changedTouches[0].clientY - this.stage_info.top
    );
    this.path.beginX = e.changedTouches[0].clientX - this.stage_info.left;
    this.path.beginY = e.changedTouches[0].clientY - this.stage_info.top;
    canvas.addEventListener("touchmove", function() {
      that.drawing(event);
    });
  }
  drawing(e) {
    this.cxt.lineTo(
      e.changedTouches[0].clientX - this.stage_info.left,
      e.changedTouches[0].clientY - this.stage_info.top
    );
    this.path.endX = e.changedTouches[0].clientX - this.stage_info.left;
    this.path.endY = e.changedTouches[0].clientY - this.stage_info.top;
    this.cxt.stroke();
  }
  drawEnd() {
    document.removeEventListener("touchstart", preHandler, false);
    document.removeEventListener("touchend", preHandler, false);
    document.removeEventListener("touchmove", preHandler, false);
    //canvas.ontouchmove = canvas.ontouchend = null
  }
  clear(btn) {
    this.base64Id = "";
    this.cxt.clearRect(0, 0, 500, 600);
  }
  save() {
    var blank = document.createElement("canvas"); //系统获取一个空canvas对象
    blank.width = canvas.width;
    blank.height = canvas.height;
    let flag = canvas.toDataURL("image/png") == blank.toDataURL(); //比较值相等则为空;
    if (flag) {
      return "0";
    } else {
      return canvas.toDataURL("image/png");
    }
  }
}
export default {
  data() {
    return {
      singImgUrl: ""
    };
  },
  methods: {
	 clear() {
        draw.clear();
        this.base64Id = "";
	 },
   	save() {
      var data = "";
      data = draw.save();
      if (data == "0") {
      		this.$toast("请先签名再点击确定哦~");
      } else {
	      this.singImgUrl = data;
	      ///data 就是得到的base64格式的签名图片，根据业务这里可上传到服务器
      }
      // 
    },
}，
 mounted() {
 document.getElementById("canvasBox").addEventListener("touchmove", (e) => {
      e.preventDefault();
    });//阻止浏览器默认行为，防止签名浏览器下拉-------很重要
    this.base64Id = "";
    let _width = this.$refs.canvasBox.offsetWidth;
    this.$refs.canvas.width = _width; //适配移动端宽度给canvas
    draw = new Draw("canvas");
    draw.init();
  }
}
</script>

CSS 自行美化，相信大家都没得问题

以上为个人经验，希望能给大家一个参考，也希望大家多多支持源码搜藏网。