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Dotted line can be drawn by adding this borderDash: [10, 10]
property to each dataset in line charts. You can see the below code or fiddle -> http://jsfiddle.net/fcwbjy57/
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: 'rgba(255, 99, 132, 0.2)',
borderColor: 'rgba(255,99,132,1)',
borderWidth: 1,
borderDash: [10, 10],
fill: false
},{
label: '# of Votes1',
data: [17, 9, 13, 9, 20, 13],
backgroundColor: 'rgba(54, 162, 235, 0.2)',
borderColor: 'rgba(54, 162, 235, 1)',
borderWidth: 1,
borderDash: [10, 10],
fill: false
},{
label: '# of Votes2',
data: [1, 6, 13, 12, 20, 5],
backgroundColor: 'rgba(255, 206, 86, 0.2)',
borderColor: 'rgba(255, 206, 86, 1)',
borderWidth: 1,
borderDash: [10, 10],
fill: false
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
}
}
});
Source:stackexchange.com