Vue Chart.js-数据更改时图表未更新

米亚Near2020-03-13

我正在使用Vue.js和Chart.js绘制一些图表。每次调用该函数时generateChart()，图表不会自动更新。当我在Vue Devtools中检查数据时，它们是正确的，但图表未反映数据。

有趣的事实：调整窗口大小时，图表正在更新。

我在做什么错了？
每次致电时如何更新图表generateChart()？

我认为这将object与array更改检测警告有关，但是我不确定该怎么做。

https://codepen.io/anon/pen/bWRVKB?editors=1010

<el-dialog title="Chart" v-model="showGeneratedChart">
     <line-chart :chartData="dataChart"></line-chart>
</el-dialog>

 export default{
    data (){
        const self = this;
        return {
         dataChart : {
                labels : [],
                datasets: [{
                        label: 'label',
                        backgroundColor: '#FC2525',
                        data: [0, 1, 2, 3, 4],
                    }]
        }
    }
}


 generateChart() { 
     this.dataChart['labels'] = [];
     this.dataChart['datasets'] = [];

     ... compute datasets and formattedLabels

     this.dataChart['labels'] = formattedLabels;
     this.dataChart['datasets'] = datasets;
 }

LineChart.js

import { Line, mixins } from 'vue-chartjs'

export default Line.extend({
    mixins: [mixins.reactiveProp],
    props: ["options"],
    mounted () {
        this.renderChart(this.chartData, this.options)
    }
})

理查德A2020/03/13 20:26:01

将计算的属性用于图表数据。而不是调用this.renderChartwatch，将其包装在方法中，mounted然后在和中重用该方法watch。

Vue.component("line-chart", {
  extends: VueChartJs.Line,
  props: ["data", "options"],
  mounted() {
    this.renderLineChart();
  },
  computed: {
    chartData: function() {
      return this.data;
    }
  },
  methods: {
    renderLineChart: function() {
    this.renderChart(
      {
        labels: [
          "January",
          "February",
          "March",
          "April",
          "May",
          "June",
          "July"
        ],
        datasets: [
          {
            label: "Data One",
            backgroundColor: "#f87979",
            data: this.chartData
          }
        ]
      },
      { responsive: true, maintainAspectRatio: false }
    );      
    }
  },
  watch: {
    data: function() {
      this._chart.destroy();
      //this.renderChart(this.data, this.options);
      this.renderLineChart();
    }
  }
});

var vm = new Vue({
  el: ".app",
  data: {
    message: "Hello World",
    dataChart: [10, 39, 10, 40, 39, 0, 0],
    test: [4, 4, 4, 4, 4, 4]
  },
  methods: {
    changeData: function() {
      this.dataChart = [6, 6, 3, 5, 5, 6];
    }
  }
});

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Vue.jS Chart</title>
</head>
<body>
<div class="app">
    {{ dataChart }}
   <button v-on:click="changeData">Change data</button>
  <line-chart :data="dataChart" :options="{responsive: true, maintainAspectRatio: false}"></line-chart>
 
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.6/vue.min.js"></script>
<script src="https://unpkg.com/vue-chartjs@2.5.7-rc3/dist/vue-chartjs.full.min.js"></script>
</body>
</html>

You could also make the options a computed property, and if option not going to change much you can setup default props. https://vuejs.org/v2/guide/components.html#Prop-Validation

Here is a working codepen https://codepen.io/azs06/pen/KmqyaN?editors=1010

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