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DateTime Axis Interval behavior seems buggy
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dan
#1 Posted : Monday, October 22, 2012 10:10:56 AM(UTC)
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I had a datetime x axis defined like this.

axes: [{type: 'dateTime', location: 'bottom', labels:{strokeStyle: '#AAAAAA', fillStyle : '#AAAAAA', angle: 30, stringFormat: 'd mmmm, yyyy', lineWidth: 1}}],

The interval displays correctly in most cases, but when the number of days the dataset spans less 2 days or less the automatic interval calculation results in 24 identical DD Month YYYY interval labels . I realize this is because I have excluded the hours from the labels. Since I don't care about the hour intervals, I have now set intervalType to 'days' as follows:

axes: [{type: 'dateTime', intervalType: 'days', location: 'bottom', labels:{strokeStyle: '#AAAAAA', fillStyle : '#AAAAAA', angle: 30, stringFormat: 'd mmmm, yyyy', lineWidth: 1}}],

Two problems arise when 'days' is set:

Bug 1: When the intervalType is set to 'days', the x-axis disappears whenever the dataset spans between 3 and 8 days or so. IE., The x-axis is displayed when the dataset spans 2 days, but not 3 days - 8 days.

Bug 2: When the dataset spans more than 2.5 months, there is a lot of overlapping x-axis labels. It looks like some of the interval labels are automatically removed in an attempt to prevent overlap, but the calculations are incorrect for my legend font settings.
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Dragan
#2 Posted : Monday, October 22, 2012 12:12:08 PM(UTC)
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Hi,

In your case I think it is best to keep the jqChart automatic calculation of the intervalType and just changing the string format.

There are 2 ways you can do this:
- With using “stringFormat” option, which you already observed.
- With using “hoursIntervalStringFormat”. In this case you can set custom formatting, which is used only when the intervalType becomes ‘hours’. I think you set it to something like

Code:
hoursIntervalStringFormat : "HH:MM d mmmm"



Best Regards,
Dragan Matek
jqChart Inc.
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1 user thanked Dragan for this useful post.
dan on 10/25/2012(UTC)
dan
#3 Posted : Thursday, October 25, 2012 12:30:27 PM(UTC)
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Thanks. I have found that hoursIntervalStringFormat works as long as stringFormat is absent.

Because the default m/d/YYYY format is now displayed whenever the interval is not hours, and stringFormat cannot be used to change this, it is necessary to also specify daysIntervalStringFormat, weeksIntervalStringFormat, monthsIntervalStringFormat, and yearsIntervalStringFormat to ensure the default format is never shown.
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