i believe what you are looking for is this..

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.


in highcharts 3.0 you can use

    labels: {
        step: newvalue

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

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