Show only first and last xAxis label in Highcharts - highcharts

Question

I would like to display only the first and the last label on my xAxis. This would give enough of a »frame« for the user. However, I don't succeed in it. I am working with a synchronized chart, which can be found here. Is the second and third »column« of (smaller) graphs, I am targeting at.
I tried to work with »startOnTick« and »endOnTick«, but it won't do it.
xAxis: {
crosshair: true,
events: {
setExtremes: syncExtremes
},
visible: i === 1,
showFirstlabel: true,
showLastlabel: true,
startOnTick: true,
endOnTick: true,
labels: {
step: 500,
format: '{value}'
}
},
What is the correct way to force Highcharts to display only first and last label?
Here is a short fiddle (don't know why the line does not appear; it shows the values with mouseover...).
Thanks for any hints.

Answer 1

You can use the xAxis.labels.formatter callback to show wanted ticks:
Demo: https://jsfiddle.net/BlackLabel/m2Ln8sdg/
xAxis: {
tickAmount: 10,
labels: {
formatter() {
if(this.isFirst || this.isLast) {
return this.value
} else {
return ''
}
}
}
},
API: https://api.highcharts.com/highcharts/xAxis.labels.formatter
If you want to have more control about it (like hide label and tick) you can use the load callback method and proper logic to hide/show ticks:
Demo: https://jsfiddle.net/BlackLabel/fbcdskmv/
chart: {
events: {
load() {
let chart = this;
for (let i in chart.xAxis[0].ticks) {
//hide all
chart.xAxis[0].ticks[i].label.hide()
chart.xAxis[0].ticks[i].mark.hide()
// show first and last tick
if (chart.xAxis[0].ticks[i].isFirst || chart.xAxis[0].ticks[i].isLast) {
chart.xAxis[0].ticks[i].mark.show()
chart.xAxis[0].ticks[i].label.show()
}
}
}
}
API: https://api.highcharts.com/highcharts/chart.events.load
Or use the tickPositioner callback to achieve it: https://api.highcharts.com/highcharts/xAxis.tickPositioner

Answer 2

The above answers are good, but i just wanted to show another approach which works just fine.
In my styling i do this;
.highcharts-xaxis-labels > text:not(:first-child):not(:last-child) {
visibility: hidden !important;
}

Answer 3

Summing up #luftikus143 and #Sebastian Wędzel comments:
const data = [
['Jan 2020', 167],
['Feb 2020', 170],
['Mar 2020', 172]
];
xAxis: {
type: 'category',
tickPositions: [0, data.length - 1]
}
Will output only the first and last labels. #martinethyl's workaround answer might need some extra tweaks specially if you have multiple data points. Suggestions (might not work well with smaller media types):
xAxis: {
type: 'category',
labels: {
rotation: 0,
x: 5, // Optional: moves labels along the x-axis
style: {
textOverflow: 'none', // Removes ellipsis
whiteSpace: 'nowrap', // Gets the label text in one line
},
},