Loop in order to generate data points in Javascript

Question

I am trying to generate an area graph for two (or more) products i.e. Mosquito Repellents and Liquid Soap. I am using the JavaScript library CanvasJS to do that. The problem is that I need approximately 2000 data points instead of 4 hardcoded here and the problem is that I am unable to generate a for loop for two (or more) products that will do this for me. Can anyone help me on how to create this loop?

var chart = new CanvasJS.Chart("chartContainer", {
    data: [{
        type: "area",
        name: "Mosquito Repellents",
        showInLegend: "true",
        dataPoints: [{
                y: 83450,
                label: "spring"
            }, {
                y: 51240,
                label: "summer"
            }, {
                y: 64120,
                label: "fall"
            }, {
                y: 71450,
                label: "winter"
            }

        ]
    }, {
        type: "area",
        name: "Liquid Soap",
        showInLegend: "true",
        dataPoints: [{
                y: 20140,
                label: "spring"
            }, {
                y: 30170,
                label: "summer"
            }, {
                y: 24410,
                label: "autumn"
            }, {
                y: 38120,
                label: "fall"
            }

        ]
    }]
});

Random would do at this point. The final concept would be to gain data from a database, but this is down the road. — deadpixels
– deadpixels, Commented Jun 22, 2015 at 22:26

Koen Peters · Accepted Answer · 2015-06-22 22:41:17Z

You can use the Math.random function and a function to get it done. The function takes two parameters to set the lower and upper limits of the random y value.

var mosquitoRepellentsDataPoints = generateDataPoints(10000, 40000),
    liquidSoapDataPoints = generateDataPoints(10000, 40000);

var chart = new CanvasJS.Chart("chartContainer", {
    data: [{
        type: "area",
        name: "Mosquito Repellents",
        showInLegend: "true",
        dataPoints: mosquitoRepellentsDataPoints
    }, {
        type: "area",
        name: "Liquid Soap",
        showInLegend: "true",
        dataPoints: liquidSoapDataPoints
    }]
});


function generateDataPoints(lowerLimit, upperLimit) {
    var i,
        arr = [],
        seasons = ['spring', 'summer', 'fall', 'winter'];

    for (i = 0; i < 2000; i++) {
        arr.push({
            y: lowerLimit + Math.round(Math.random() * (upperLimit - lowerLimit)),
            label: seasons[Math.floor(Math.random() * seasons.length)]
        });
    }
    return arr;
}

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