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vue項目中使用html2canvas解決截圖不全的問題

更新時間：2023年11月24日 10:38:07 作者：吃葡萄不吐葡萄皮嘻嘻

本文主要介紹了vue項目中使用html2canvas解決截圖不全的問題

一、安裝插件

npm i html2canvas --save

二、頁面引入插件

import html2canvas from "html2canvas";

<div>
    <el-button @click="downloadPicture">下載</el-button>
    <div ref="imageDom">
      <el-table
        :data="tableData"
        style="width: 100%"
        :row-class-name="tableRowClassName"
      >
        <el-table-column prop="date" label="日期" width="180"> </el-table-column>
        <el-table-column prop="name" label="姓名" width="180"> </el-table-column>
        <el-table-column prop="address" label="地址"> </el-table-column>
        <el-table-column prop="age" label="年齡"> </el-table-column>
      </el-table>
   </div>
</div>

頁面效果圖展示（有橫向和縱向的滾動條）：

在這里插入圖片描述

重點思路：

首先是獲取要截取頁面的父元素，通過clone并緊隨于body之后，在生成幕布的時候不再拿著父元素去截取，而是截取clone的div，這樣的話就可以實現(xiàn)整個頁面的截取了

 //截圖
    downloadPicture () {
      var width = this.$refs.imageDom.style.width
      var cloneDom = this.$refs.imageDom.cloneNode(true)
      cloneDom.style.position = 'absolute'
      cloneDom.style.top = '0px'
      cloneDom.style.zIndex = '-1'
      cloneDom.style.width = width
      document.body.appendChild(cloneDom)
      html2canvas(cloneDom).then(canvas => {
        // 轉(zhuǎn)成圖片，生成圖片地址
        var imgUrl = canvas.toDataURL('image/png')
        var eleLink = document.createElement('a')
        eleLink.href = imgUrl // 轉(zhuǎn)換后的圖片地址
        eleLink.download = 'pictureName'
        // 觸發(fā)點擊
        document.body.appendChild(eleLink)
        eleLink.click()
        // 然后移除
        document.body.removeChild(eleLink)
      })
      cloneDom.style.display = 'none'
    },

下載一鍵截屏效果圖展示如下（完美展示～～）：

在這里插入圖片描述

!!!注意：以上代碼沒有設(shè)置table高度和列固定，如果table設(shè)置了高度或者設(shè)置了列固定會出現(xiàn)截圖不全的問題，此時需要動態(tài)的給table設(shè)置高度和列固定，不設(shè)置高度的時候高度設(shè)置為空值才生效，設(shè)置為none、auto、100%不生效

所有代碼如下：

<template>
  <div ref="imageDom" >
    <el-button @click="downloadPicture">下載</el-button>
    <div >
      <el-table
        class="tableX"
        :height="flag ? '400' : ''"
        :data="tableData"
        :row-class-name="tableRowClassName"
      >
        <el-table-column :fixed="flag?true:false" prop="date" label="日期" width="180">
        </el-table-column>
        <el-table-column  prop="name" label="姓名" width="180">
        </el-table-column>
        <el-table-column prop="address" label="地址"> </el-table-column>
        <el-table-column prop="age" label="年齡"> </el-table-column>
        <el-table-column prop="sex" label="性別"> </el-table-column>
        <el-table-column prop="hobby" label="愛好"> </el-table-column>
      </el-table>
    </div>
  </div>
</template>

<script>
import html2canvas from "html2canvas";
export default {
  data() {
    return {
      tableData: [
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "開始",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市",
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市",
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市",
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市",
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海",
          age: 30,sex:'女',hobby:'愛好'
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "結(jié)尾",
        },
      ],
      h: 400,
      flag: true,
    };
  },
  methods: {
    tableRowClassName({ rowIndex }) {
      if (rowIndex % 2 === 0) {
        return "warning-row";
      } else if (rowIndex % 2 !== 0) {
        return "success-row";
      }
      return "";
    },
    //截圖
    downloadPicture() {
      this.flag = false;
      this.$nextTick(() => {
        var width = this.$refs.imageDom.style.width;
        var cloneDom = this.$refs.imageDom.cloneNode(true);
        cloneDom.style.position = "absolute";
        cloneDom.style.top = "0px";
        cloneDom.style.zIndex = "-1";
        cloneDom.style.width = width;
        console.log(cloneDom);
        document.body.appendChild(cloneDom);
        html2canvas(cloneDom).then((canvas) => {
          // 轉(zhuǎn)成圖片，生成圖片地址
          var imgUrl = canvas.toDataURL("image/png");
          var eleLink = document.createElement("a");
          eleLink.href = imgUrl; // 轉(zhuǎn)換后的圖片地址
          eleLink.download = "pictureName";
          // 觸發(fā)點擊
          document.body.appendChild(eleLink);
          eleLink.click();
          // 然后移除
          document.body.removeChild(eleLink);
        });
        cloneDom.style.display = "none";
        this.flag = true;
      });
    },
  },
};
</script>

<style>
.el-table .warning-row {
  background: oldlace;
}

.el-table .success-row {
  background: #f0f9eb;
}
</style>

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