Difficulty encountered while integrating chart.js with Django using npm

Encountering an issue while using Chart.js in my Django project - when utilizing the NPM package, it fails to work. However, switching to the CDN resolves the problem seamlessly.

Chart.js version 3.9.1

Below is a snippet from my project's index.html file:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
{#    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>#}
    <script type="application/json" src="/node_modules/chart.js/dist/chart.js"></script>
</head>
<body>

<canvas id="myChart" width="400" height="400"></canvas>
<script>
const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
        datasets: [{
            label: '# of Votes',
            data: [12, 19, 3, 5, 2, 3],
            backgroundColor: [
                'rgba(255, 99, 132, 0.2)',
                'rgba(54, 162, 235, 0.2)',
                'rgba(255, 206, 86, 0.2)',
                'rgba(75, 192, 192, 0.2)',
                'rgba(153, 102, 255, 0.2)',
                'rgba(255, 159, 64, 0.2)'
            ],
            borderColor: [
                'rgba(255, 99, 132, 1)',
                'rgba(54, 162, 235, 1)',
                'rgba(255, 206, 86, 1)',
                'rgba(75, 192, 192, 1)',
                'rgba(153, 102, 255, 1)',
                'rgba(255, 159, 64, 1)'
            ],
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            y: {
                beginAtZero: true
            }
        }
    }
});
</script>


</body>
</html>

The console error message in the browser reads:

(index):17 Uncaught ReferenceError: Chart is not defined
    at (index):17:17

I attempted to implement chart.min.js in my script without success. Furthermore, experimentation with older versions of Chart.js also proved futile. Even trying to locally host the CDN code within the project did not resolve the issue.

Answer №1

The issue lies in how Django renders HTML based on the context object specified in your Python views. Django does not have knowledge of NPM, NodeJS, or the node_modules folder.

Typically, npm is used to install packages for a NodeJS project that will ultimately be converted into a vanilla JS file without dependencies for hosting.

This is why installing Chart.js with npm won't work, as it gets stored in a node_modules folder which Django doesn't recognize. On the other hand, using a CDN effectively embeds the dependency within the HTML, allowing it to be referenced in all subsequent JS scripts.

I hope this explanation clarifies things for you. If there are any aspects that require further clarification, please feel free to reach out.

Answer №2

To enable Django to serve the JavaScript file, it is necessary to use a static path.

Project Name
   App Name
       Static
           JS 
           CSS
           Img

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