I'm working with Chart.js 2 to create a scatter plot using Epoch timestamps for the x coordinates and integers for the y coordinates. Is there a way to customize the x-axis labels on the graph to show dates in a more readable format?
Update: I am currently constructing my graph using Unix timestamps in milliseconds. Other sections of this prototype convert those dates using the toDateString method of the Date class (e.g. Fri Aug 5 2016).
To customize the date format for each x-axis tick in Chart.js, you can utilize the ticks.userCallback within the scales.xAxes option. If you are using the version of Chart.js that includes moment.js, formatting dates is simple. However, if you are working with timestamps in milliseconds, you have the flexibility to tailor the labels as needed.
options: {
scales: {
xAxes: [{
ticks: {
userCallback: function(label, index, labels) {
return moment(label).format("DD/MM/YY");
}
}
]}
}
}
Check out this fiddle for a demonstration: https://jsfiddle.net/leighking2/q5ak7p3h/
For version 3.4, achieving this can be done in the following way:
settings: {
axes: {
horizontal: {
tickmarks: {
// Add a dollar sign to each tickmark
customFormat: function(value, index, values) {
return '$' + value;
}
}
}
}
}
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