Make a <select> method for selecting drawing chart files

Question

I have a chart drawn using data from an external file. Now I want a select box where the user can select the file to read. This way the chart can change dynamically. How can I use vue and chartjs to achieve this functionality?

Currently, I import data in Home like this:

<template>
  <div class="home">
    <Graph :vul_data="data"/>
  </div>
</template>

<script>
import { Component, Prop, Vue } from 'vue-property-decorator';
import Graph from '@/components/Graph.vue';
import {data} from '@/data/dataFile.js'

@Component({
  components: {
    Graph,
  },
})
export default class HomeView extends Vue {
  data() {
    return {
      data: data,
    }
  }
}
</script>

The data for each file is as follows:

export const data = {
    "points": {
      "line1": {
        "x": [
          -11,
          -11,
        ],
        "y": [
          7,
          8,
        ]
      },
    },
}

The components are as follows:

<template>
  <div>
    <canvas id="myChart"></canvas>
  </div>
</template>
<script>

import Chart from 'chart.js/auto';

export default{
  name: "Graph",
  props: ["vul_data"],

  mounted(){
    const ctx = document.getElementById('myChart');
    const myChart = new Chart(ctx, {
        type: 'scatter',
        data: {
          datasets: [{
            label: 'Line 1',
            data:[
              {x: this.vul_data.points.line1.x[0], y: this.vul_data.points.line1.y[0]},
              {x: this.vul_data.points.line1.x[1], y: this.vul_data.points.line1.y[1]},
            ],
          },
          ]
        },
    });
  }
}
</script>
<style>
  
</style>

Answer 1

You can use the <select> tag where the options contain a value equal to the name of your .js file. When the selection changes, run a method that dynamically imports the file and assigns the imported data to variables you pass as properties to the Graph component. Simple sample code:

<select @change="selectFile">
  <option value="dataFile1">文件一</option>
  <option value="dataFile2">文件二</option>
</select>
<Graph :vul_data="data" />

data() {
  return {
    data: null,
  };
},
methods: {
  selectFile(e) {
    import(`@/data/${e.target.value}.js`).then((res) => {
      this.data = res.data;
    });
  },
},