highcharts - chart names for multiple pie chart series in one chart - highcharts

Question

I need to display multiple pie charts that are all related to the same data. As such I want them all to be part of the same chart and implement them as individual series.
This all works no problems until I tried to put labels/titles over each individual pie chart. It seems that I can only have a title over the entire group. See jsfiddle
Is there any way to have the titles over each chart?
See above jsfiddle for example

Answer 1

I encountered the same problem, and found this solution via highcharts support forum :
http://highcharts.uservoice.com/forums/55896-general/suggestions/3073133-pie-title
The Highcharts dude has written a plugin that you can see working on the following jsfiddle : http://jsfiddle.net/highcharts/tnSRA/
I have copy-pasted this plugin in a highcharts-plugins.js file that I included in my website, works like a charm!
Here's the plugin code :
/**
* Pie title plugin
* Last revision: 2012-12-21
*/
(function (Highcharts) {
Highcharts.wrap(Highcharts.seriesTypes.pie.prototype, 'render', function (proceed) {
var chart = this.chart,
center = this.center || (this.yAxis && this.yAxis.center),
titleOption = this.options.title,
box;
proceed.call(this);
if (center && titleOption) {
box = {
x: chart.plotLeft + center[0] - 0.5 * center[2],
y: chart.plotTop + center[1] - 0.5 * center[2],
width: center[2],
height: center[2]
};
if (!this.title) {
this.title = this.chart.renderer.label(titleOption.text)
.css(titleOption.style)
.add()
.align(titleOption, null, box);
} else {
this.title.align(titleOption, null, box);
}
}
});
}(Highcharts));
And this is how you configure your title (put this in your series elements) :
title: {
// align: 'left',
// x: 0
// style: { color: XXX, fontStyle: etc }
text: '<b>Pie 1</b><br>Subtext',
verticalAlign: 'top',
y: -40
},

Answer 2

To further improve on this, the code below correctly handles left, center, and right justification for the titles. See fiddle at http://jsfiddle.net/9y4Lj4yr/ for an example.
/**
* Pie title plugin
* Last revision: 2015-5-20
*/
(function (Highcharts) {
Highcharts.wrap(Highcharts.seriesTypes.pie.prototype, 'render', function (proceed) {
var chart = this.chart,
center = this.center || (this.yAxis && this.yAxis.center),
titleOption = this.options.title,
box;
proceed.call(this);
if (center && titleOption) {
box = {
x: chart.plotLeft + center[0] - 0.5 * center[2],
y: chart.plotTop + center[1] - 0.5 * center[2],
width: center[2],
height: center[2]
};
if (!this.title) {
this.title = this.chart.renderer.label(titleOption.text)
.css(titleOption.style)
.add()
}
var labelBBox = this.title.getBBox();
if (titleOption.align == "center")
box.x -= labelBBox.width/2;
else if (titleOption.align == "right")
box.x -= labelBBox.width;
this.title.align(titleOption, null, box);
}
});
} (Highcharts));

Answer 3

You can use renderer which allows to add text in any place.
http://api.highcharts.com/highcharts#Renderer.text()

Answer 4

Improving on Vincent's answer. This is how I used it for simple Text titles.
extendHighcharts = function(){
Highcharts.wrap(Highcharts.seriesTypes.pie.prototype, 'render', function (proceed) {
//Clear the title if added previously
//if your chart data does not change, this reference storage for removal can be left out
if(this.chart.subChartTitleElement){
this.chart.subChartTitleElement[this.id].destroy();
}
proceed.call(this);
if (this.center && this.options.title) {
//first, add the title, at center or anywhere, we need the container width to center it
this.chart.subChartTitleElement[this.id] = this.chart.renderer.text(this.options.title.text,this.center[0],this.center[1]);
this.chart.subChartTitleElement[this.id].css(this.options.title.style)
this.chart.subChartTitleElement[this.id].add();
//Center the title using the container(Bounding Box = BBox) width
var xCenter = this.chart.plotLeft + this.center[0] - (this.chart.subChartTitleElement[this.id].getBBox().width/2),
yCenter = this.chart.plotTop + this.center[1] - 0.6 * this.center[2];
this.chart.subChartTitleElement[this.id].attr(
{
x:xCenter,
y:yCenter
}
);
}
});
}
USAGE
this.chart.addSeries({
type: 'pie',
name: 'pie_chart_1',
data: pieChartData,
center: ['80%','25%'],
size: '35%',
showInLegend: false,
dataLabels: {
enabled: false
},
//this part adds the relevant information
title: {
text:'Pie Chart Title',
verticalAlign: 'top',
y: -40
},
id:'a_unique_id_or_name'
});