How can I update the chartjs instance?

I am currently working on creating a reactive graph that updates based on certain values. However, I am running into issues where my computed ChartData() function is not updating the component as expected. I have tried using the update() function, but I am facing difficulties as I do not have an instance for it. Is there a way to access functions like .update() and .destroy() for my LineChart when I don't have an instance for it? How can I obtain an instance of the graph? What could be causing this issue? I believe I have 2 methods available to update the graph, is this correct?

Update: Although I managed to get an instance, the problem still persists. The computed property seems to not update the data in the Line chart, and the update() function is not doing anything.

<template>
    <div class="graph__busManag">
      <Line ref="Graph" id="Chart" :data="ChartData" :options="options" :plugins="plugins" />

    </div>
</template>

<script>

import {
  Chart as ChartJS,
  CategoryScale,
  LinearScale,
  PointElement,
  LineElement,
  Title,
  Tooltip,
  Legend,
} from "chart.js";
ChartJS.register(
  CategoryScale,
  LinearScale,
  PointElement,
  LineElement,
  Title,
  Tooltip,
  Legend
);
import { Line } from "vue-chartjs";

data() {
    return {
        data: ...something,
        option: ...somedata,

},
  computed: {
    ChartData() {
      return this.data; // Should update graph, but doesn't , despite the fact that it is constantly triggered
    }
  },
  mounted() {
      this.data.datasets.data = [50, 60, 70, 80, 90, 100];
      this.data = {...this.data};

      const chartInstance = this.$refs.Graph.chart

      console.log(chartInstance);
      chartInstance.update(); // not working
      chartInstance.reset(); // not w
  },
}

Answer №1

To retrieve your chart instance, utilize the static method getChart by specifying the assigned ID of your chart. Afterwards, you can proceed to make updates to the chart:

import { Chart } from 'chart.js';

const myChart = Chart.getChart(assignedChartId);

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