目录

 

 

基本概念

代码

---

 

基本概念

如下的例子，刚开始运行：

点击按钮：

数据库修改下数据：

再点击按钮刷新下：

下面给出请求的json数据:

刷新有2个方式

第一种是强制刷新，这样是有问题的，数据和图表不能同步：

this.$forceUpdate()

本人推荐下面这种方式，通过绑定组建的key值

<barChartItem ref="barItem" v-bind:count="numCount" v-bind:valueList="valueList" v-bind:key="valueList.toString()"></barChartItem>

把key绑定成变动的值，就可以实时刷新了

 

 

代码

程序结构如下：

关键代码

BarCharts.vue

<template>
  <div>
    <div id="main" style="width: 500px; height:500px"></div>
  </div>
</template>
 
<script>
export default {
  props: ['count', 'valueList'],
  watch:{
    count:val => {
      alert(this.count)
    }
  },
  mounted(){
    this.initGra();
  },
  methods: {
    //开始画图了
    initGra(){
 
      // 基于准备好的dom，初始化echarts实例
      let myChart = this.$echarts.init(document.getElementById('main'));
      this.getData();
    },
    getData(){
 
      if (myChart != null && myChart != "" && myChart != undefined) {
        myChart.dispose();
      }
 
      // 基于准备好的dom，初始化echarts实例
      let myChart = this.$echarts.init(document.getElementById('main'));
 
      //初始化数据
      let dataList = [];
      for(let i = 0; i < this.count; i++){
 
        dataList.push(this.valueList[i]);
      }
 
      console.log(this.count)
      console.log(this.valueList)
      //alert(this.count)
      //alert(this.valueList)
 
      // 指定图表的配置项和数据
      let option = {
        title: {
          text: 'ECharts 入门示例'
        },
        tooltip: {},
        legend: {
          data:['销量']
        },
        xAxis: {
          data: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子"]
        },
        yAxis: {},
        series: [{
          name: '销量',
          type: 'bar',
          data: dataList
        }]
      };
 
      // 使用刚指定的配置项和数据显示图表。
      myChart.setOption(option);
    }
  }
}
</script>
 
<style scoped>
  .item{
    color: green;
  }
</style>

main.js

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
import Axios from 'axios'
import echarts from 'echarts'
import TestEChart from './TestEChart'
 
Vue.config.productionTip = false
Vue.prototype.$axios=Axios
Vue.prototype.$echarts = echarts
 
/* eslint-disable no-new */
new Vue({
  el: '#app',
  components: { TestEChart },
  template: '<TestEChart/>',
})

TestEChart.vue

<template>
  <div>
    <barChartItem ref="barItem" v-bind:count="numCount" v-bind:valueList="valueList" v-bind:key="valueList.toString()"></barChartItem>
    <div>
      <button @click="handleSubmit">获取</button>
    </div>
  </div>
</template>
 
<script>
 
  import BarChartItem from './components/BarCharts'
 
export default {
  data() {
    return {
      numCount: 0,
      valueList: []
    }
  },
  components: {
    'barChartItem' : BarChartItem
  },
  methods: {
    handleSubmit(){
       this.$axios({
         type: 'get',
         url: '/gra/list'
       }).then(res => {
 
         //console.log(res.data.data)
 
         let jsonTest = res.data.data.content
 
         //目前只有1条数据 展示这么写
         this.numCount = jsonTest[0].count
         this.valueList = jsonTest[0].value;
 
         //console.log(this.numCount)
         //console.log(this.valueList)
 
         this.$refs.barItem.getData()
         //this.$set()
         //this.$forceUpdate()
       }).catch(err=>{
 
         alert(err)
       })
    },
  }
}
</script>
 
<style>
 
</style>