Highcharts addSeries yAxis Label Formatting - highcharts

Question

I have a Highcharts chart that works great and has custom formatting for the yAxis labels using the following formatting.
yAxis: {
labels: {
formatter: function () {
var newNumber = formatNumber(this.value, 1);
return newNumber;
}
};
However, when I dynamically add a series like below, the yAxis labels do not have the same custom formatting. It looks like they just end up using the default Highcharts number formatting.
chart.addSeries({
data: newData,
yAxis: newDataName
});
How can I make it so the dynamically added series has the same label number formatting as the originally loaded series?
Also, note that I need to name the dynamically added series ("newDataName") so that I can reference it again later to remove it.
And here is how the axis is added dynamically as well. Because to clarify, I am adding a series, but also adding an axis to display that series.
chart.addAxis({
id: theData,
title: {
text: "newAxis"
}
});

Answer 1

Since you are dynamically adding both a series and a new axis that the series should be using, this axis also needs to include the formatter details. For example (JSFiddle):
// New axis
chart.addAxis({
id: 'new',
// Which also has the label formatter
labels: {
formatter: function () {
return formatNumber(this.value, 1);
}
},
title: {
text: "newAxis"
}
});
// New series which uses the axis
chart.addSeries({
data: [43934, 52503, 57177, 69658, 97031, 119931, 137133, 154175],
yAxis: 'new'
});