How to introduce newline character in xAxes Label with chart js - qml

Question

I am facing problem in inserting a newline character in xAxes labels with chart Js.
Below is the sample code used for formatting xAxes labels
"scales": {
"xAxes": [{
"type" : 'time',
"display": true,
time: {
unit: 'millisecond',
stepSize: 5,
displayFormats: {
millisecond: 'HH:mm - YYYY/MM/DD'
}
}
}]
}
With the above code, the xAxes labels looks like 13:10 - 2022/02/01.
But, I want to be like below:

Answer 1

For multiline labels you will need to proide an array for the label in which each entry is its own line. This can be achieved with the tick callback:
function newDate(milis) {
return moment().add(milis, 'ms');
}
var config = {
type: 'line',
data: {
labels: [newDate(-4), newDate(-3), newDate(2), newDate(3), newDate(4), newDate(5), newDate(6)],
datasets: [{
label: "My First dataset",
data: [1, 3, 4, 2, 1, 4, 2],
}]
},
options: {
scales: {
xAxes: [{
ticks: {
callback: (tick) => (tick.split('-'))
},
type: 'time',
time: {
unit: 'millisecond',
stepSize: 5,
displayFormats: {
millisecond: 'HH:mm - YYYY/MM/DD'
}
}
}],
},
}
};
var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, config);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.13.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.bundle.min.js"></script>
<canvas id="myChart"></canvas>