jqplot tooltip on bar chart

Question

I\'m using the jquery plugin jqplot for plotting some bar charts. on hover, I\'d like to display the tick for the bar and its value on a tooltip. I\'ve tried

Answer 1

I go through jqplot.highlighter.js and find an undocumented property: tooltipContentEditor. I use it to customize the tooltip to display x-axis label.

Use something like this:

highlighter:{
        show:true,
        tooltipContentEditor:tooltipContentEditor
    },

function tooltipContentEditor(str, seriesIndex, pointIndex, plot) {
    // display series_label, x-axis_tick, y-axis value
    return plot.series[seriesIndex]["label"] + ", " + plot.data[seriesIndex][pointIndex];
}

Answer 2

nevermind, I did a roundabout way to create my own tooltip via jquery.

I left my highlighter settings as they were in my question (though you probably don't need the tooltip stuff).

In my js file after the bar chart is set up (after $.jqplot('chart', ...) I set up an on mouse hover binding, as some of the examples showed. I modified it like this:

 $('#mychartdiv').bind('jqplotDataHighlight', 
        function (ev, seriesIndex, pointIndex, data ) {
            var mouseX = ev.pageX; //these are going to be how jquery knows where to put the div that will be our tooltip
            var mouseY = ev.pageY;
            $('#chartpseudotooltip').html(ticks_array[pointIndex] + ', ' + data[1]);
            var cssObj = {
                  'position' : 'absolute',
                  'font-weight' : 'bold',
                  'left' : mouseX + 'px', //usually needs more offset here
                  'top' : mouseY + 'px'
                };
            $('#chartpseudotooltip').css(cssObj);
            }
    );    

    $('#chartv').bind('jqplotDataUnhighlight', 
        function (ev) {
            $('#chartpseudotooltip').html('');
        }
    );

explanation: ticks_array is previously defined, containing the x axis tick strings. jqplot's data has the current data under your mouse as an [x-category-#, y-value] type array. pointIndex has the current highlighted bar #. Basically we will use this to get the tick string.

Then I styled the tooltip so that it appears close to where the mouse cursor is. You will probably need to subtract from mouseX and mouseY a bit if this div is in other positioned containers.

you can then style #chartpseudotooltip in your css. If you want the default styles you can just add it to .jqplot-highlighter-tooltip in the the jqplot.css.

hope this is helpful to others!

Answer 3

I am using the version of the highlighter plugin on the following link:

https://github.com/tryolabs/jqplot-highlighter

The parameters I am using:

highlighter: {
    show:true,
    tooltipLocation: 'n',
    tooltipAxes: 'pieref', // exclusive to this version
    tooltipAxisX: 20, // exclusive to this version
    tooltipAxisY: 20, // exclusive to this version
    useAxesFormatters: false,
    formatString:'%s, %P',
}

The new parameters ensure a fixed location where the tooltip will appear. I prefer to place it on the upper left corner to avoid problems with resizing the container div.