Guidelines for importing Json information onto a Charts.js visualization

I am looking to integrate the "temp" data variable, identified by ID within (.list), from the provided Json () as an x-axis variable in the chart below:

var ctx = document.getElementById('myChart').getContext('2d');
var chart = new Chart(ctx, {
    // The type of chart we want to create
    type: 'line',

    // The data for our dataset
    data: {
        labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
        datasets: [{
            label: 'My First dataset',
            backgroundColor: 'rgb(255, 99, 132)',
            borderColor: 'rgb(255, 99, 132)',
            data: [0, 10, 5, 2, 20, 30, 45]
        }]
    },

    // Configuration options go here
    options: {}
});



<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a8cbc0c9dadc86c2dbe89a86908698">[email protected]</a>"></script>
<canvas id="myChart"></canvas>

The chart is currently operational without the Json data. How can I import this specific data to replace the existing "data: [0, 10, 5, 2, 20, 30, 45]" variables?

Answer №1

If you're facing difficulties with retrieving data from the API, here are three simple steps to follow:

  1. Begin by making a network request to the provided URL using the fetch function. This request prompts the openweathermap website to send you the necessary data.
const response = await fetch('http://api.openweathermap.org/data/2.5/forecast?lat=53.4808&lon=2.2426&appid=4ce23fd03d1558816c3ef6efb6a5ec30&units=metric');

After making the request, you will receive a Response object. However, this object includes HTTP headers that are unnecessary. You specifically need the JSON data sent in the response.

  1. Next, extract the JSON data.
const data = await response.json()
  1. Lastly, parse the JSON object to retrieve the temperature values.
const chartData = data.list.map((object) => object.main.temp)

To clarify further: The JSON object from the API contains an array named "list" which in turn includes a "main" attribute holding the temperature value you require. By accessing "json.list" and using the map function, you extract the "temp" value from each "main" object to create a new array.

Let me know if you need more clarification!

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