Having trouble getting my javascript integration to work in a Django template - any ideas on what could be causing

As a newcomer to Django, I'm working on creating a small webpage that displays a chart using Chart.js. My goal is to load the JavaScript file statically. To achieve this, I have set up a basic HTML file named data_table.html and included a "static" folder containing three files: data_table.js, styles.css, and an image named bild.jpg.

{% load static %}
<!DOCTYPE html>
<head>
    <link rel="stylesheet" href="{% static 'styles.css' %}" type="text/css">
    <script type="text/javascript" src="{% static 'data_table.js' %}"></script>
    <title>Data viewer</title>
    
</head>
<body>
    <canvas id="myChart" width="200" height="200"></canvas>
    <script>
    </script>
    <p class="text">Picture:</p>
    <br>
    <img class="img" src="{% static 'bild.jpg' %}" alt="My image">
</body>
</html>

The CSS file and the image are successfully loaded, with the picture being displayed and resizable through the CSS file. Moving on to the JavaScript file, it's structured as shown below:

const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
    // Chart configuration details here
});    

However, despite including the JavaScript file in the correct location, the chart doesn't render. Strangely, when I embed the JavaScript code between the empty script tags in the body of the HTML file, the chart displays properly. I've also attempted moving the

<script type="text/javascript" src="{% static 'data_table.js' %}"></script>
line to different locations within the file, but to no avail. No errors are thrown, leaving me puzzled about what I might be doing incorrectly.

I appreciate any guidance or solutions you can offer. Especially if it turns out I made a simple oversight. Thank you in advance for your help!

Answer №1

Sometimes the answer is simpler than how difficult the problem may seem:

Although the JS file is being loaded, the Django template code is not being executed. This might be the reason why they are referred to as static files. For those facing a similar issue: consider creating another view that returns JSON data and fetch it using JavaScript.

Answer №2

To organize your static files, create three subdirectories within the static directory: css, js, and img. 1. Save the data_table.js file inside the js folder. 2. Next, load the static directory using the following command: {% load static %} 3. Finally, include this line in your HTML file:

<script type="text/javascript" src="{% static 'js/data_table.js' %}"></script>

Answer №3

To ensure proper execution, your JavaScript file should be triggered after the webpage has fully loaded. You have two options to achieve this: either place the JS file just before the closing body tag so that it loads when all elements are ready, or attach an event listener for DOMContentLoaded which will initiate the code only after the page has been completely loaded.

Method One:

<html>
    <head>
        ...
    </head>
    <body>
        ...
        <!-- Include your js file just before closing body tag to ensure all elements are loaded -->
        <script type="text/javascript" src="{% static 'data_table.js' %}"></script>
    </body>
</html>

Method Two:

document.addEventListener('DOMContentLoaded', function()
{
    const ctx = document.getElementById('myChart').getContext('2d');
    const myChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: [{% for d in data%}'{{d.label}}',{%endfor%}],
            datasets: [{
                label: '# of Votes',
                data: [{% for d in data%}{{d.data}},{%endfor%}],
                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
                }
            }
        }
    });  
});

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