Highcharts tooltip formatter - highcharts

Question

For this.x, I am getting the index location when I push the data in via code. If I populate the data separately, like the following code, then this.x returns the right item. How can I fix this issue?
Works
xAxis: {
categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
},
series: [{
data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
}]
Index location is getting pushed out for this.x here
var points = [{
Name: 'good',
Y: '15000'
}, {
Name: 'baad',
Y: '3000'
}, {
Name: 'wow',
Y: '2000'
}];
var chartData = {
GetChartSeries: function (points, name) {
var seriesData = [];
if (points != null && points != 'undefined') {
for (i=0; i<points.length; i++) {
seriesData.push({
name: ""+points[i].Name,
y: parseFloat(points[i].Y)
//,color: ''
});
}
}
return seriesData;
}
};
$(function () {
$('#container').highcharts({
chart: {
type: 'column',
margin: [ 50, 50, 100, 80],
borderColor: '#A4A4A4',
borderRadius: 5,
borderWidth: 2
},
legend: {
enabled: false
},
title: {
text: 'Graduation Year Breakdown'
},
colors: ['#790000'],
legend: {
enabled: false
},
plotOptions: {
series: {
/*
dataLabels: {
enabled: true,
color: 'red'
},
*/
borderRadius: 3,
colorByPoint: true
}
},
tooltip: {
formatter: function() {
return '<b>'+ Highcharts.numberFormat(this.y, 0) +'</b><br/>'+
'in year: '+ this.x;
}
},
xAxis: {
categories: [],
labels: {
rotation: -45,
align: 'right',
style: {
fontSize: '13px',
fontFamily: 'Verdana, sans-serif'
}
}
},
yAxis: {
min: 0,
title: {
text: 'Number of Students'
}
},
series: [{
//name: 'Population',
data: chartData.GetChartSeries(points, ""),//[4000, 3400, 2000, 34000, 120000],
dataLabels: {
enabled: true,
//rotation: -90,
color: '#4F4F4F',
align: 'center',//'right',
//x: 4,
//y: 10,
style: {
fontSize: '12px',
//fontWeight: 'bold',
fontFamily: 'Verdana, sans-serif'
}
}
}]
});
});

Answer 1

While I am uncertain as to why your solution doesn't work, I can propose an alternative solution.
The tooltip formatter function has access to a number of different parameters. Instead of this.x, you could use this.point.name.
For example:
formatter: function() {
// If you want to see what is available in the formatter, you can
// examine the `this` variable.
// console.log(this);
return '<b>'+ Highcharts.numberFormat(this.y, 0) +'</b><br/>'+
'in year: '+ this.point.name;
}