Utilizing ChartJS to convert a chart into a Base64 image within a Vue environment

I am currently utilizing the PrimeVue chart component, which is built on top of ChartJS.

The configuration is very similar.

The documentation indicates that I need to instantiate a new Chart() and then call toBase64Image();

https://i.sstatic.net/NMHjV.png

My main query is, how do I access the Chart constructor?

<script lang="ts" setup>
import Chart from 'primevue/chart';
import ChartDataLabels from 'chartjs-plugin-datalabels';
import { ref } from 'vue';
import { ChartData } from 'chart.js';

const props = defineProps<{
  data?: ChartData;
  aspectRatio?: number;
  title?: string;
  printWidth?: number;
  printHeight?: number;
}>();

const options = ref({
  plugins: {
    datalabels: {
      labels: {
        title: {
          color: 'black',
        },
      },
      align: 'end',
      anchor: 'start',
      offset: 1,
      formatter
    }
  },
  aspectRatio: props.aspectRatio
  animation: {
    onComplete: () => {
     // How can I access the Chart constructor in this context?
      var base64Chart = Chart.toBase64Image();
    }
  }
});

</script>

<template>
  <section class="config-asset-chart">
    <span>{{title}}</span>
    <Chart
      class="px-2"
      :data="data"
      :width="props.printWidth"
      :height="props.printHeight"
      :options="options"
      :plugins="[ChartDataLabels]"
    />
  </section>
</template>
javascriptvue.jschart.js

Answer №1

To make this work, you must assign a reference to the component in the following way:

Template;

<Chart
    ref="myChart"
    ...
/>

<script setup>;

import { ref } from "vue";

...

const myChart = ref();

...

onComplete: () => {
    var base64Chart = myChart.value.toBase64Image();
}

Answer №2

Upon completion of the animation, you will receive a context object within the onComplete event handler associated with this animation. This context object contains the chart instance, allowing you to invoke the toBase64Image method.

    onComplete: (ctx) => {
     // Obtain access to the Chart constructor here
      var base64Chart = ctx.chart.toBase64Image();
    }


var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, 3, 5, 2, 3]
    }]
  },
  options: {
    animation: {
      onComplete: (ctx) => {
        console.log(ctx.chart.toBase64Image());
      }
    }
  }
});
<script src="https://npmcdn.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ccafa4adbeb8e2a6bf8cf8e2fee2fc">[email protected]</a>/dist/chart.umd.js"></script>
<div class="myChartDiv">
  <canvas id="myChart" width="600" height="400"></canvas>
</div>

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