score:0

I believe what you are looking for is this..

http://api.highcharts.com/highcharts#chart.events.selection

You would need to change the xAxis labels steps in the event of a zoom action. You will need to determine how many labels you would want to show, based on how many labels are visible as a result of the zoom.

score:2

In Highcharts 3.0 you can use

chart.xAxis[0].update({
    labels: {
        step: newValue
    }
}

for updating step. Just setting new value in options for new chart won't work.


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