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how to activate vertical grid lines for time-based data ?
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ssc
#1 Posted : Sunday, February 19, 2012 2:01:32 AM(UTC)
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I display time-based data in a chart and I would like to have vertical grid lines in there, analog to the horizontal lines that are drawn by default. I see in the documentation how to customize vertical line width, color, interval, etc. - but I would like to leave all these settings for jqChart to automatically figure out - just like for horizontal lines.
So I basically just would like to 'activate' vertical grid lines.

Is that possible ? Maybe a 'visible' config item ?
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Dragan
#2 Posted : Sunday, February 19, 2012 3:27:07 PM(UTC)
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Hi,

You can just set:

Code:
$('#jqChart').jqChart({
            axes: [
                        {
                            type: 'dateTime',
                            location: 'bottom',
                            majorGridLines: { visible: true }, ...
Best Regards,
Dragan Matek
jqChart Inc.
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ssc
#3 Posted : Monday, February 20, 2012 10:47:54 PM(UTC)
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Thanks. If I add your code, I do get vertical grid lines, but I also get two axis at the bottom - one with the correct date & time as before, one with 10:00:00 AM printed for every vertical line. Also, it seems the vertical lines are not aligned in any way with the data displayed, they are just drawn at arbitrary intervals.
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Dragan
#4 Posted : Tuesday, February 21, 2012 2:19:39 PM(UTC)
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Hi,

Can you send me your jqChart JavaScript code, so we can look at it?
Best Regards,
Dragan Matek
jqChart Inc.
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ssc
#5 Posted : Tuesday, February 21, 2012 9:07:29 PM(UTC)
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Sure can, nothing fancy here, though:
Code:
// global chart object
var g_chart = null;

function updateChart(jsonData)
{
    // NOTE: jsonData is a simple JavaScript array
    // TODO: jqChart does not seem to clear its div
    $('#chart').empty();

    g_chart = $('#chart').jqChart
    ({
        width  : window.innerWidth,
        height : window.innerHeight,

        // TODO: this does create vertical grid lines,
        // but it also creates a second x axis with wrong labels
        // axes:
        // [
        //     {
        //         type     : 'dateTime',
        //         location : 'bottom',
        //         majorGridLines: { visible: true }
        //     }
        // ],

        border:
        {
            lineWidth : 0,
            padding   : 0
        },
        legend: { visible: false },
        series: [
                    {
                        type: 'spline',
                        data: jsonData,
                        markers:
                        {
                            size      : 5,
                            lineWidth : 6
                        }
                    }
                ],
        title: { text: '' }
    });
}
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Dragan
#6 Posted : Wednesday, February 22, 2012 12:09:41 PM(UTC)
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Hi,

Can you debug what the jsonData looks like?
Is it in format [[‘2000/01/01’, 3], [‘2000/01/02’, 7], …]?

I believe in your case the first value is a string value, which creates a spline chart on a category axis. If this is the case you can change the "type: 'category',” in the axis definition.

Code:
axes: [
              {
                    type: 'category',
                    location: 'bottom',




If you want to work with true date time data, you can convert the string values to dates. Something like this one:

Code:
function convertData(jsonData) {
            var data = [];
            for (var i = 0; i < jsonData.length; i++) {
                var item = jsonData[i];
                data.push([new Date(item[0]), item[1]]);
            }

            return data;
        }
Best Regards,
Dragan Matek
jqChart Inc.
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1 user thanked Dragan for this useful post.
ssc on 2/23/2012(UTC)
ssc
#7 Posted : Thursday, February 23, 2012 1:49:25 AM(UTC)
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dragan wrote:
Code:
axes: [{ type: 'category', ...
Great, that does this trick! Looking good now :-)

dragan wrote:
If you want to work with true date time data, you can convert the string values to dates.
I ran your code, seems to work fine, it changes the x-axis intervals to somewhat weird values though. However, I don't really have a need for true time data at the moment as I'm still working with dumb test values, but I reckon I'll get back to this once I display real world data stretching over a longer timespan.

Thank you very much for your help! :-)

cheers,

ssc
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