vue echarts饼图封装以及同一个组件2个饼图不加载问题解决

0 环境

• 系统：win10
• 前端框架：vue
• 前端IDE：vscode

1 饼图封装

1 安装echarts

npm install echarts --save

2 查看是否安装成功

• 文件查看

• 界面查看(win+r --> 输入cmd --> 输入vue ui 等待启动)

3 在main.js中引入echarts

import echarts from "echarts";
Vue.prototype.$echarts = echarts;

2 封装组件

1 新建子组件

<!-- echartscom.vue -->
  <template>
    <div class="">
        <div style="width: 500px; height: 500px" :id="id" class="echarts" ref="echarts"></div>
    </div>
</template>
   
  <script>
import * as echarts from 'echarts';
require('echarts/theme/shine'); //引入主题

export default {
    name: 'echartscom',
    // id --> 为了多图渲染
    // title --> 标题
    // chartData --> value数组
    // nameData --> name数组
    props: ['id', 'title', 'chartData', 'nameData'],
    data() {
        return {
            arr: []
        };
    },
    methods: {
        drawCharts() {
            var myChart = echarts.init(document.getElementById(this.id));
            myChart.setOption({
                title: {
                    text: this.title,
                    subtext: '详情',
                    left: 'center'
                },
                tooltip: {
                    trigger: 'item',
                    formatter: '{a} <br/>{b}: {c} ({d}%)'
                },
                legend: {
                    orient: 'vertical',
                    x: 'left',
                    data: this.nameData
                },
                series: [
                    {
                        name: '访问来源',
                        type: 'pie',
                        radius: '40%',
                        center: ['50%', '60%'],
                        avoidLabelOverlap: false,
                        label: {
                            normal: {
                                formatter: '{b}:{c}' + '\n\r' + '({d}%)',
                                show: true,
                                position: 'left'
                            },
                            emphasis: {
                                show: true
                            }
                        },
                        labelLine: {
                            show: true, //数据标签引导线
                            lineStyle: {
                                color: 'rgba(255, 255, 255, 0.3)'
                            },
                            normal: {
                                // 设置引导线
                                show: true
                                // length: 18
                            }
                        },
                        data: this.arr
                    }
                ]
            });

            // window.addEventListener('resize', function () {
            //     myChart.resize();
            // });
        },
        initData() {
            this.nameData.forEach((val, i) => {
            // 列数据
                this.chartData.forEach((item, index) => {
                    if (i == index) {
                        this.arr.push({
                            value: item,
                            name: val
                        });
                    }
                });
            });
        }
    },
    watch: {
        chartData: {
            // 在父组件数据发生改变后子组件要做到实时更新,就需要子组件用watch来监听数据的变化
            // 看情况是否需要newValue和oldValue之间值比较
            handler(newValue, oldValue) {
                this.arr.length = 0;
                this.initData();
                this.drawCharts();
            },
            deep: true
        }
    },
    computed: {
        echarts() {
            return 'echarts' + Math.random() * 100000;
        }
    },
    mounted() {
        this.drawCharts();
    },
    beforeMount() {},
    beforeCreate() {
    },
    created() {
        this.initData();
    },
    components: {}
};
</script>
  
 <style></style>

2 父组件调用子组件

<template>
    <div class="">
        <el-row :gutter="20">
            <el-col :span="12">
                <div>
                    <!-- v-if 数值存在时加载饼图 -->
                    <echartscom
                        id="echarts"
                        v-if="msg.chartData.length > 0"
                        :nameData="msg.rows"
                        
                        :chartData="msg.chartData2"
                        autoresize
                    />
                </div>
            </el-col>
            <el-col :span="12">
                <div>
                  <echartscom
                        id="all"
                        v-if="msg.chartData1.length > 0"
                        :nameData="msg.rows1"
                        
                        :chartData="msg.chartData3"
                        autoresize
                    />
                </div>
            </el-col>
        </el-row>
    </div>
</template>

<script>
//这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
//例如：import 《组件名称》 from '《组件路径》';
import echartscom from '你的子组件echartscom的位置';

export default {
    //import引入的组件需要注入到对象中才能使用
    components: {
        echartscom
    },
    data() {
        //这里存放数据
        return {
            msg: {
                rows: ['直接访问', '邮件营销', '联盟广告', '视频广告'],
                rows1: ['直接访问', '邮件营销', '联盟广告'],
                chartData: [335, 310, 234, 135],
                chartData1: [335, 310, 234]
            }
        };
    },
    //监听属性 类似于data概念
    computed: {},
    //监控data中的数据变化
    watch: {},
    //方法集合
    methods: {
        initData(){
            // 请求后台数据 返回返回给chartData chartData1即可
        }
    },
    //生命周期 - 创建完成（可以访问当前this实例）
    created() {},
    //生命周期 - 挂载完成（可以访问DOM元素）
    mounted() {
        // 在这里初始化你的数据
        this.initData();
    },
    beforeCreate() {}, //生命周期 - 创建之前
    beforeMount() {}, //生命周期 - 挂载之前
    beforeUpdate() {}, //生命周期 - 更新之前
    updated() {}, //生命周期 - 更新之后
    beforeDestroy() {}, //生命周期 - 销毁之前
    destroyed() {}, //生命周期 - 销毁完成
    activated() {} //如果页面有keep-alive缓存功能，这个函数会触发
};
</script>
<style scoped>
</style>

3 效果图

4 2个饼图不加载/没有实时刷新问题

1.「使用$nextTick方法 我试了没用 需要在父组件添加v-if判断 存在 加载自子组件(饼图)」

2.「子组件添加watch 监听父组件传来的值是否变化 来决定是否加载饼图」

5 参考地址

vue中使用echarts图表不显示解决办法