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小程序mpvue中动态切换echarts图表

mpvue中使用echarts图表

如果你用mpvue,而且还想用echarts,那么这个包你可以以来一下

在微信小程序中使用 ECharts

创建公共组件

考虑到多个页面都休要用,所以抽出来作为一个组件,总得来说根据官方的例子小改动了一下,目录如下

vue文件

<template>
  <div class="echarts-wrap">
    <mpvue-echarts :echarts="echarts" :onInit="handleInit" canvasId="getCanvasId" ref="echarts" />
  </div>
</template>

<script src="./control.js"></script>

<style scoped lang="stylus" src="./style.styl"></style>

js文件

import echarts from 'echarts'
import mpvueEcharts from 'mpvue-echarts'
import { messageTip, wxHideLoading, wxLoading } from "../../utils/wxapi";

export default {
  data () {
    return {
      echarts
    }
  },
  watch: {
    getOptions: { // 每次切换数据源,都需要重新渲染,所以用watch观察数据是否改变
      handler (newValue, oldValue) {
        if (newValue) {
          this.initChart(newValue)
        } else {
          this.initChart(oldValue)
        }
      },
      deep: true
    }
  },
  props: [
    'getOptions',
    'getCanvasId'
  ],
  computed: {},
  methods: {
    initChart (value) {
      let _this = this
      setTimeout(() => { // 渲染需要延时执行,不要问为什么
        _this.getOptions = value
         echarts.dispose(_this.$refs.echarts); // 处理内存泄漏
        _this.$refs.echarts.init()
        wxHideLoading()
      }, 200)

    },

    handleInit(canvas, width, height) {
      let chart = echarts.init(canvas, null, {
        width: width,
        height: height
      })
      canvas.setChart(chart)
      chart.clear() // 防止重复渲染,所以在构建之前,清空一下
      chart.setOption(this.getOptions, true) // 重新构建数据源
      this.echartsArr[this.getCanvasId] = chart
      return chart
    }
  },
  components: {
    mpvueEcharts
  },
  onLoad () {
  },
  onShow () {
  },
  onHide () {
  },
  onUnload () {
  }
}

css样式

我这里设置的图标高度是300

.echarts-wrap
   width: 100vw;
   height: 300px;

在页面中使用

导入echarts组件

import mpEcharts from '../../components/mpvue_echarts'

export default {
  data () {
    return {
    wxOptions: this.ecDay,
      ecDay:  {
        xAxis: {
            type: 'category',
            data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
        },
        yAxis: {
            type: 'value'
        },
        series: [{
            data: [820, 932, 901, 934, 1290, 1330, 1320],
            type: 'line'
        }]
     },
     ecMonth: {
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
        type: 'value'
    },
    series: [{
        data: [120, 200, 150, 80, 70, 110, 130],
        type: 'bar',
        showBackground: true,
        backgroundStyle: {
            color: 'rgba(220, 220, 220, 0.8)'
        }
    }]
}
   }
  },
  computed: {},
  methods: {
    /**
     * 延时切换数据
     */
    changeData(index) {
      switch (index) {
        case 0:
          this.canvasId = 'line'
          this.wxOptions = this.ecDay
          break
        case 1:
          this.canvasId = 'bar'
          this.wxOptions = this.ecMonth
          break
      }
    },
  },
  components: {
    mpvueEcharts
  },
  onLoad () {
  },
  onShow () {
  },
  onHide () {
  },
  onUnload () {
  }
}

在vue文件中使用

<template>
  <div class="echarts-wrap">
 	<span @click="changeData(0)">切换数据源0</span>
    <span @click="changeData(1)">切换数据源1</span>
    <mp-echarts :getOptions="wxOptions" :getCanvasId="canvasId"></mp-echarts>
  </div>
</template>

<script src="./control.js"></script>

<style scoped lang="stylus" src="./style.styl"></style>

最后一次编辑于  07-16  
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