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将Echarts图表导出为图片的3种方法总结

作者:慢慢manman

这篇文章主要给大家介绍了关于将Echarts图表导出为图片的3种方法,Echarts是一种基于JavaScript的可视化库,用于创建丰富、交互式的图表和地图,而Excel是一种电子表格软件,用于数据处理和分析,需要的朋友可以参考下

 第一种 使用 html2canvas 对dom元素截图

1.npm安装

npm install html2canvas

yarn安装

yarn add html2canvas

2.组件引入

import html2canvas from "html2canvas"

3.代码

// 导出多张图表为一张图片
// dmo元素里的内容转换为canvas,并将canvas下载为图片
const download = () => {
  // 转换成canvas
  html2canvas(document.getElementById("echarts")).then(function (canvas) {
    var img = canvas
      .toDataURL("image/png")
      .replace("image/png", "image/octet-stream");
    // 创建a标签,实现下载
    var creatIMg = document.createElement("a");
    creatIMg.download = "图表.png"; // 设置下载的文件名,
    creatIMg.href = img; // 下载url
    document.body.appendChild(creatIMg);
    creatIMg.click();
    creatIMg.remove(); // 下载之后把创建的元素删除
  });
};

第二种 使用Echarts官方文档中的 getDataURL 方法

// 导出单个图表图片
function Export() {
  var img = new Image();
  // pieMyChart1 要导出的图表
  img.src = pieMyChart1.value.getDataURL({
    type: "png",
    pixelRatio: 1, //放大2倍
    backgroundColor: "#fff",
  });
  img.onload = function () {
    var canvas = document.createElement("canvas");
    canvas.width = img.width;
    canvas.height = img.height;
    var ctx = canvas.getContext("2d");
    ctx.drawImage(img, 0, 0);
    var dataURL = canvas.toDataURL("image/png");
    var a = document.createElement("a");
    var event = new MouseEvent("click");
    a.download = "图片.png" || "下载图片名称";
    // 将生成的URL设置为a.href属性
    a.href = dataURL;
    // 触发a的单击事件
    a.dispatchEvent(event);
    a.remove();
  };
}

第三种 使用Echarts官方文档中的 toolbox

toolbox: {
      show: true,
      orient: "vertical",
      left: "right",
      top: "center",
      feature: {
        saveAsImage: { show: true },  // 保存图表
      },
},

完整代码

<template>
  <el-scrollbar>
    <div style="padding: 10px 10px 0">
      <el-button type="primary" @click="refresh">刷新</el-button>
      <el-button @click="download">下载</el-button>
      <el-button @click="Export">导出pie</el-button>
    </div>
    <el-divider />
    <div id="echarts">
      <div class="about" id="main"></div>
      <div class="about" id="pie"></div>
    </div>
  </el-scrollbar>
</template>
<script setup>
import { ref, getCurrentInstance, onMounted } from "vue";
import html2canvas from "html2canvas";
const { appContext } = getCurrentInstance();
const { $echarts } = appContext.config.globalProperties;
onMounted(() => {
  setEcharts();
});
const pieMyChart1 = ref(null);
const setEcharts = () => {
  // 基于准备好的dom,初始化echarts实例
  var myChart = $echarts.init(document.getElementById("main"));
  // 绘制图表
  myChart.setOption({
    title: {
      text: "ECharts 入门示例",
    },
    tooltip: {},
    xAxis: {
      data: ["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"],
      axisTick: {
        // 坐标轴刻度标签
        show: false,
      },
    },
    yAxis: {
      type: "value", // 类型数值轴
      min: 0,
      max: 40,
      splitNumber: 8, // 坐标轴的分割段数
      axisLine: {
        show: true,
      },
      axisTick: {
        show: false, // 隐藏刻度
      },
    },
    series: [
      {
        name: "销量",
        type: "bar",
        label: {
          show: true,
          fontSize: 16,
        },
        data: [5, 20, 36, 10, 10, 20],
        itemStyle: {
          borderRadius: 5,
          borderWidth: 1,
          borderType: "solid",
          borderColor: "#73c0de",
        },
      },
    ],
  });
  // 绘制图表
  const pieMyChart = $echarts.init(document.getElementById("pie"));
  pieMyChart1.value = pieMyChart;
  pieMyChart.setOption({
    title: {
      text: "ECharts 入门示例",
      titleStyle: {
        lineHeight: 18,
      },
      top: "0px",
    },
    tooltip: {},
    legend: {
      orient: "vertical",
      x: "left",
      data: ["A", "B", "C", "D", "E"],
      top: "80px",
    },
    toolbox: {
      show: true,
      orient: "vertical",
      left: "right",
      top: "center",
      feature: {
        saveAsImage: { show: true }, // 保存图表
      },
    },
    series: [
      {
        type: "pie",
        data: [
          {
            value: 335,
            name: "A",
          },
          {
            value: 234,
            name: "B",
          },
          {
            value: 548,
            name: "C",
          },
          {
            value: 500,
            name: "D",
          },
          {
            value: 500,
            name: "E",
          },
        ],
      },
    ],
  });
};
// 页面刷新
const refresh = () => {
  location.reload();
};
// 导出多张图表为一张图片
// dmo元素里的内容转换为canvas,并将canvas下载为图片
const download = () => {
  // 转换成canvas
  html2canvas(document.getElementById("echarts")).then(function (canvas) {
    var img = canvas
      .toDataURL("image/png")
      .replace("image/png", "image/octet-stream");
    // 创建a标签,实现下载
    var creatIMg = document.createElement("a");
    creatIMg.download = "图表.png"; // 设置下载的文件名,
    creatIMg.href = img; // 下载url
    document.body.appendChild(creatIMg);
    creatIMg.click();
    creatIMg.remove(); // 下载之后把创建的元素删除
  });
};
// 导出单个图表图片
function Export() {
  var img = new Image();
  img.src = pieMyChart1.value.getDataURL({
    type: "png",
    pixelRatio: 1, //放大2倍
    backgroundColor: "#fff",
  });
  img.onload = function () {
    var canvas = document.createElement("canvas");
    canvas.width = img.width;
    canvas.height = img.height;
    var ctx = canvas.getContext("2d");
    ctx.drawImage(img, 0, 0);
    var dataURL = canvas.toDataURL("image/png");
    var a = document.createElement("a");
    var event = new MouseEvent("click");
    a.download = "图片.png" || "下载图片名称";
    // 将生成的URL设置为a.href属性
    a.href = dataURL;
    // 触发a的单击事件
    a.dispatchEvent(event);
    a.remove();
  };
}
</script>
<style>
.el-scrollbar {
  height: calc(100vh - 59px);
}
.el-divider--horizontal {
  margin: 10px 0;
}
#echarts {
  padding: 20px;
  width: 600px;
}
#main {
  height: 300px;
  width: 600px;
}
#pie {
  height: 300px;
  width: 600px;
}
</style>

总结

到此这篇关于将Echarts图表导出为图片的3种方法的文章就介绍到这了,更多相关Echarts图表导出为图片内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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