Primefaces LineChartModel: put date in Y axis - primefaces

Question

I'm using JSF2 and PrimeFaces 5.1.
My problem is that I don't know how to put dates in the Y axis of my graph. It only accepts Number types.
/**
* Graph's definition
* #return LineChartModel
* #throws ParseException
*/
public LineChartModel createLineModels() throws ParseException {
LineChartModel lineChartModel = new LineChartModel();
lineChartModel = initCategoryModel();
lineChartModel.setTitle("Graph's title");
lineChartModel.setLegendPosition("nw");
lineChartModel.getAxes().put(AxisType.X, new CategoryAxis("PV"));
Axis yAxis = this.lineChartModel.getAxis(AxisType.Y);
yAxis.setTickInterval("1");
yAxis.setLabel("Provisional dates");
return lineChartModel;
}
/**
* Initialization of the graph
* #return LineChartModel
* #throws ParseException
*/
public LineChartModel initCategoryModel() throws ParseException {
LineChartModel model = new LineChartModel();
ChartSeries provisionalDates= new ChartSeries();
provisionalDates.setLabel("Dates");
//Here, I set my data in the Graph
//In x-axis the date and the y-axis a numerical value
provisionalDates.set("2016-01-01", 5);
provisionalDates.set("2016-01-15", 8);
model.addSeries(provisionalDates);
return model;
}
My issue are those lines:
provisionalDates.set("2016-01-01", 5);
provisionalDates.set("2016-01-15", 8);
The method set only accept a Numerical value. I want to have date instead.
Do you know a way so I can put my dates in the Y axis?
Thanks

Answer 1

I finally found an answer with jqPlot.
The method set only accept a numerical value so what I did is to convert my date in milliseconds.
long dateMS= myDate.getTime();
provisionalDates.set("2016-01-15", dateMS);
Then, you can add an extender to your chart with PF. The extender allows you to configure your chart:
model.setExtender("extender"); //Works with PF 5+
After that, you just need to make the extender function:
function extender() {
this.cfg.axes.yaxis.tickOptions = {
formatter: function (format, value) {
return $.jqplot.sprintf(convertDate(value));
}
};
}
The convertDate function only convert a getTime to dd/mm/yyyy.
function convertDate(ms) {
var dateReadable = new Date(ms);
var year = dateReadable.getFullYear();
var month = dateReadable.getMonth() + 1;
if (month < 10) {
month = "0" + month;
}
var day = dateReadable.getDate();
if (day < 10) {
day = "0" + day;
}
return day + "/" + month + "/" + year;
}