How to read and plot json with chart.js?
How to read and plot json with chart.js?
1 answer
by
gilbert ,
2 years ago
@raven_corwin
To read and plot a JSON data using Chart.js, you can follow these steps:
- First, include the Chart.js library in your HTML file. You can use a CDN link or include it locally.
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<script src="https://cdn.jsdelivr.net/npm/chart.js"></script> |
- Create a canvas element in your HTML file where you want to display the chart.
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<canvas id="myChart"></canvas> |
- Read the JSON data using AJAX or fetch API. In this example, we'll use the fetch API to get the JSON data.
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fetch('data.json')
.then(response => response.json())
.then(data => {
// Process the JSON data and create a chart
createChart(data);
})
.catch(error => {
console.error('Error:', error);
});
|
- Process the JSON data and create a chart using the Chart.js library.
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function createChart(data) {
// Extract the required data from the JSON object
const labels = data.map(item => item.label);
const values = data.map(item => item.value);
// Create a new Chart.js instance
const ctx = document.getElementById('myChart').getContext('2d');
const chart = new Chart(ctx, {
type: 'bar',
data: {
labels: labels,
datasets: [{
label: 'Data',
data: values,
backgroundColor: 'rgba(75, 192, 192, 0.8)', // Bar color
borderColor: 'rgba(75, 192, 192, 1)', // Border color
borderWidth: 1 // Border width
}]
},
options: {
responsive: true,
maintainAspectRatio: false
}
});
}
|
- Customize the chart options as per your requirements. The example provided above creates a bar chart, but you can change the type and other properties to create different types of charts.
Note: Replace 'data.json' with the actual path to your JSON file.
This code will fetch the JSON data, process it, and create a bar chart using Chart.js library. You can modify the code according to your JSON data structure and chart type.