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

highlighter: { show: true, 
            showTooltip: true,      // show a tooltip with data point values.
            tooltipLocation: 'nw',  // location of tooltip: n, ne, e, se, s, sw, w, nw.
            tooltipAxes: 'both',    // which axis values to display in the tooltip, x, y or both.
            lineWidthAdjust: 2.5   // pixels to add to the size line stroking the data point marker
            }

but it doesn't work. the bar visually gets lighter, and there's a small dot on the top (which would ideally go away--probably from line chart renderer stuff), but there is no tooltip anywhere. Anyone know how I can do this? I'll have lots of bars so the x-axis will be cluttered and kind of a mess if I show them down there only.

score 31 · Accepted Answer · answered Jul 26 '12 at 15:36

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];
}

great property/callback solution. That'd help me a lot. – brunobord Sep 18 '12 at 15:59 — brunobord, Sep 18 '12 at 15:59

score 22 · Answer 2 · edited Mar 12 '12 at 14:08

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!

You should totally share that here then to help anyone else with the same problem — jcolebrand, Feb 03 '11 at 23:16
@butterywombat: I have the same problem as you now and I try to incorporate your code with mine and I didn't see any changes on tooltip. I really new to jquery, would like to ask for some advice. especially on the "#mychartdiv" and "#chartv", do I need to have those two define? Thanks a lot. :) — Ianthe, Nov 16 '11 at 05:40
oh no, I didn't get that message...well *replies a year later* I think I didn't change '#chartv' into '#mychartdiv' when I pasted my code to stack overflow. So I'm pretty sure #chartv is suppose to say #mychartdiv. You would put these in the html file where you want the plot to appear — butterywombat, Jan 16 '12 at 14:16

Wagner Dias · Answer 3 · 2012-10-05T14:02:31.260

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.

jqplot tooltip on bar chart

3 Answers3

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