Show data dynamically in line chart - ChartJS

Question

I need to show some data in my line graph in my Angular 6 app, after a certain amount of time, so lets say each 333ms to show some data. I am displaying data registered in max 30 sec, so every graph data can last maximum of 30 seconds. It has to start on a button click.

Here is some test data I created just for testing purposes:

test_data = {
        '222': {
            joy: 66.5057373046875,
            fear: 1.0003513832343742,
            anger: 2.000018799044483,
            disgust: 3.004251452162862,
            sadness: 4.0001135088386945,
            contempt: 5.001299204188399,
            surprise: 6.203749045729637
        },
        '238': {
            joy: 97.06363677978516,
            fear: 17.500137131541123,
            anger: 27.00000593749519,
            disgust: 6.001324078417383,
            sadness: 21.000043172625737,
            contempt: 21.00033742573578,
            surprise: 32.62530106306076
        },
        '722': {
            joy: 66.5057373046875,
            fear: 60.000351383234374,
            anger: 70.00001879904448,
            disgust: 10.004251452162862,
            sadness: 92.0001135088387,
            contempt: 40.0012992041884,
            surprise: 50.20374904572964
        },
        '838': {
            joy: 97.06363677978516,
            fear: 15.000137131541123,
            anger: 64.50000593749519,
            disgust: 24.501324078417383,
            sadness: 31.500043172625737,
            contempt: 18.50033742573578,
            surprise: 6.2048268765211105
        },
        '1722': {
            joy: 66.5057373046875,
            fear: 54.000351383234374,
            anger: 72.00001879904448,
            disgust: 0.004251452162861824,
            sadness: 80.0001135088387,
            contempt: 20.0012992041884,
            surprise: 20.203749045729637
        },
        '2838': {
            joy: 95.37223815917969,
            fear: 41.000168004859006,
            anger: 62.00000752212509,
            disgust: 33.001674098544754,
            sadness: 3.000052563053032,
            contempt: 44.00044780407916,
            surprise: 4.204549819231033
        },
        '2839': {
            joy: 98.75503540039062,
            fear: 1.0001062582232407,
            anger: 1.0000043528652895,
            disgust: 1.0009740582900122,
            sadness: 2.000033782198443,
            contempt: 2.0002270473924,
            surprise: 1.2051039338111877
        }
    };

Here, these values '222', '238' etc, are milliseconds where these values need to be shown in the graph. I structured this data so I have arrays like this:

joyArray = {
    data: [66.5057373046875, 97.06363677978516, 66.5057373046875, 97.06363677978516, 66.5057373046875, 95.37223815917969, 98.75503540039062],
    label: '',
    borderColor: 'rgba(255, 217, 40, 1)',
    backgroundColor: 'transparent',
    fill: false
};

// push all arrays into this array to show it on the graph
this.chartData.push(this.joyArray, this.fearArray, this.angerArray, this.disgustArray, this.sadnessArray,
            this.surpriseArray, this.contemptArray);

and so on, for every object property.

My graph is implemented like this:

<canvas id="chartCanvas"></canvas>

This is what it looks like:

So I need to click on a button and show these values for each frame (222ms, 238ms...), anyone has an idea how to do this using chartJS?

EDIT: changed the structure of arrays, now it is an object with data inside. Draw chart function looks like this:

drawChart() {
        this.chart = new Chart('chartCanvas', {
            type: 'line',
            data: this.data,
            options: this.options
        });
    }

Data object:

data = {
    labels: [],
    datasets: [] // datasets = this.chartData;
};

Answer 1

test_data = {
    '1222': {
        joy: 66.5057373046875,
        fear: 1.0003513832343742,
        anger: 2.000018799044483,
        disgust: 3.004251452162862,
        sadness: 4.0001135088386945,
        contempt: 5.001299204188399,
        surprise: 6.203749045729637
    },
    '2238': {
        joy: 97.06363677978516,
        fear: 17.500137131541123,
        anger: 27.00000593749519,
        disgust: 6.001324078417383,
        sadness: 21.000043172625737,
        contempt: 21.00033742573578,
        surprise: 32.62530106306076
    },
    '3722': {
        joy: 66.5057373046875,
        fear: 60.000351383234374,
        anger: 70.00001879904448,
        disgust: 10.004251452162862,
        sadness: 92.0001135088387,
        contempt: 40.0012992041884,
        surprise: 50.20374904572964
    },
    '4838': {
        joy: 97.06363677978516,
        fear: 15.000137131541123,
        anger: 64.50000593749519,
        disgust: 24.501324078417383,
        sadness: 31.500043172625737,
        contempt: 18.50033742573578,
        surprise: 6.2048268765211105
    },
    '5722': {
        joy: 66.5057373046875,
        fear: 54.000351383234374,
        anger: 72.00001879904448,
        disgust: 0.004251452162861824,
        sadness: 80.0001135088387,
        contempt: 20.0012992041884,
        surprise: 20.203749045729637
    },
    '6838': {
        joy: 95.37223815917969,
        fear: 41.000168004859006,
        anger: 62.00000752212509,
        disgust: 33.001674098544754,
        sadness: 3.000052563053032,
        contempt: 44.00044780407916,
        surprise: 4.204549819231033
    },
    '7839': {
        joy: 98.75503540039062,
        fear: 1.0001062582232407,
        anger: 1.0000043528652895,
        disgust: 1.0009740582900122,
        sadness: 2.000033782198443,
        contempt: 2.0002270473924,
        surprise: 1.2051039338111877
    }
};

var arr = Object.entries(test_data)


var options = {
    type: 'line',
    data: {
        labels: ["joy", "fear", "anger", "disgust", "sadness", "contempt", "surprise"],
        datasets: []
    },
    options: {
        scales: {
            yAxes: [{
                ticks: {
                    reverse: false
                }
            }]
        }
    }
}




var ctx = document.getElementById('chartJSContainer').getContext('2d');
var myC = new Chart(ctx, options);


arr.forEach((v) => {
    setTimeout(() => {


        myC.data.datasets.push({
            data: [v[1].joy, v[1].fear, v[1].anger, v[1].disgust, v[1].sadness, v[1].contempt, v[1].surprise],
            label: "#" + v[0] + "Milisec"
        });
        myC.update()
    }, parseInt(v[0]))
})

canvas { background-color : #eee;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>

<body>
    <canvas id="chartJSContainer" width="600" height="400"></canvas>
</body>