Highcharts Legend titles changing after drilldown and back? - highcharts

Question

I have sample code for question here: http://jsfiddle.net/MuydK/
The problem relates to legend title in the key under chart are changing after I have drilled in and out.
They should stay as
"actual" and
"target"
And are changing to "series 1" and "series 2".
$(function () {
var chart;
$(document).ready(function () {
var colors = Highcharts.getOptions().colors,
categories1 = ['1011', '1112', '1213', '1415'],
name1 = 'Actual',
I think I may be missing something in drilldown configuration or setChart code?
I got the same problem with a couple if charts based on code posted above.
Many Thanks

Answer 1

Hope this is what you need,
JSFiddle - Legend Name Problem
code:
function setChart(name, categories, data, color) {
console.log(name, categories, data, color);
chart.xAxis[0].setCategories(categories);
while (chart.series.length > 0) {
chart.series[0].remove(true);
}
for (var i = 0; i < data.length; i++) {
chart.addSeries({
name: name[i],
data: data[i],
color: color[i]
});
}
}

Answer 2

Edit2: The problem is in your else statement in the function bellow.
click: function() {
var drilldown = this.drilldown;
if (drilldown) { // drill down
setChart(drilldown.name, drilldown.categories, [drilldown.data], drilldown.color);
} else { // restore
setChart(name, categories1, [data1, data2], 'white');
}
}​
Instead get rid of name1 = 'Actual' and only have data1 and data2 and add name and color to them then you could do like this instead
click: function() {
var drilldown = this.drilldown;
if (drilldown) { // drill down
chart.xAxis[0].setCategories(drilldown.categories);
setChart([drilldown.data]);
} else { // restore
chart.xAxis[0].setCategories(categories);
setChart([data1, data2]);
}
}
// add code for removing series
chart.addSeries({
data
});​
I hope you understand, but it will be easier if you build data1/2as a highcharts object, and just add the drilldown part to it. So you can change;
series: [{
name: name1,
data: data1,
color: colors[0]},
{
name: name2,
data: data2,
color: colors[1]}],
to:
series: [data1, data2],​
Edit: When you are doing operations bellow you should not set redraw to true, it will be much faster. The same goes for adding the series. You do not need to call chart.redraw() until you have removed and added the charts. And removing stuff is easier backwards. So change:
while (chart.series.length > 0) {
chart.series[0].remove(true);
}
To
for (var i = chart.series.length; i >= 0; i--){
chart.series[i].remove(false);
}
// add series with redraw == false
chart.redraw();