Fill Chart.js with specific JSON array

Question

Currently i'm trying to learn Javascript, however I can't seem to get this problem fixed:

I have a Json file which is filled with data. I want the specific arrays of the first month August (Reports, Average, Global) and insert them (via a variable) into my chart. So I get a chart with:

August

• Reports: 7
• Average: 25
• Global: 20

June ... ect.

Any help or tips are welcome!!

JSON Data

[{
    "month": "August",
    "reports": 7,
    "average": 25,
    "global": 20,
    "percentage": 14
}, {
    "month": "July",
    "reports": 22,
    "average": 25,
    "global": 20,
    "percentage": 44
}, {
    "month": "June",
    "reports": 12,
    "average": 25,
    "global": 20,
    "percentage": 24
}]

JS Code

window.onload = function() {

    var reports = [];

    $.getJSON("data.json", function(data) {
        reports = data;
    });


    var repaug = 7;
    var avg = 25;
    var global = 20;

    var ctx = document.getElementById("Chart1");
    var Chart1 = new Chart(ctx, {
        type: 'doughnut',
        data: {
            labels: ["Reports", "Average PSN", "Global Average"],
            datasets: [{
                label: '# of reports',
                data: [repaug, global, avg],
                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: {}
    })
}

Answer 1

Inside of datasets you could add an array so first you need to loop for your response.

You could use map() method for array.

DEMO

 let arrayData =[{"month":"August","reports":7,"average":25,"global":20,"percentage":14},{"month":"July","reports":22,"average":25,"global":20,"percentage":44},{"month":"June","reports":12,"average":25,"global":20,"percentage":24}], datasets = arrayData.map(item => { return { label: `${item.month}`, data: [item.reports, item.average, item.global], backgroundColor: [ 'rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)', 'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)' ], borderColor: [ 'rgba(255,99,132,1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)', 'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)' ], borderWidth: 1 } }), ctx = document.getElementById("myChart").getContext('2d'); new Chart(ctx, { type: 'doughnut', data: { labels: ["Reports", "Average PSN", "Global Average"], datasets: datasets }, options: { responsive: true, legend: { position: 'top', }, animation: { animateScale: true, animateRotate: true }, tooltips: { callbacks: { label: function(item, data) { let datasets = data.datasets, dIndex = item.datasetIndex, index = item.index; return `${datasets[dIndex].label} : ${data.labels[index]} : ${datasets[dIndex].data[index]}`; } } } } }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.min.js"></script> <canvas id="myChart"></canvas>