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.

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!