Show values on top of bars in a barChart
I have a bar chart with ordinal scale for the x-axis. I want to display the y-values on the top of each bar or in the bottom of each bar. It would be also acceptable to display the y-values when one hovers over the bar. Is there a function or a way in a dc.js to do that? Here is the jsfiddle and my code is below the pic>
Edit: Here is my code: HTML
<body>
<div id='Chart'>
</div>
</body>
JS
var data = [{
Category: "A",
ID: "1"
}, {
Category: "A",
ID: "1"
}, {
Category: "A",
ID: "1"
}, {
Category: "A",
ID: "2"
}, {
Category: "A",
ID: "2"
}, {
Category: "B",
ID: "1"
}, {
Category: "B",
ID: "1"
}, {
Category: "B",
ID: "1"
}, {
Category: "B",
ID: "2"
}, {
Category: "B",
ID: "3"
}, {
Category: "B",
ID: "3"
}, {
Category: "B",
ID: "3"
}, {
Category: "B",
ID: "4"
}, {
Category: "C",
ID: "1"
}, {
Category: "C",
ID: "2"
}, {
Category: "C",
ID: "3"
}, {
Category: "C",
ID: "4"
}, {
Category: "C",
ID: "4"
},{
Category: "C",
ID: "5"
}];
var ndx = crossfilter(data);
var XDimension = ndx.dimension(function (d) {
return d.Category;
});
var YDimension = XDimension.group().reduceCount(function (d) {
return d.value;
});
dc.barChart("#Chart")
.width(480).height(300)
.dimension(XDimension)
.group(YDimension)
.transitionDuration(500)
.xUnits(dc.units.ordinal)
.label(function(d) {return d.value})
.x(d3.scale.ordinal().domain(XDimension))
dc.renderAll();
Answer
Check updated jsfiddle
.renderlet(function(chart){
var barsData = [];
var bars = chart.selectAll('.bar').each(function(d) { barsData.push(d); });
//Remove old values (if found)
d3.select(bars[0][0].parentNode).select('#inline-labels').remove();
//Create group for labels
var gLabels = d3.select(bars[0][0].parentNode).append('g').attr('id','inline-labels');
for (var i = bars[0].length - 1; i >= 0; i--) {
var b = bars[0][i];
//Only create label if bar height is tall enough
if (+b.getAttribute('height') < 18) continue;
gLabels
.append("text")
.text(barsData[i].data.value)
.attr('x', +b.getAttribute('x') + (b.getAttribute('width')/2) )
.attr('y', +b.getAttribute('y') + 15)
.attr('text-anchor', 'middle')
.attr('fill', 'white');
}
})
If you don't want the labels visible when the bars redraw (for example when bars change after user filters/clicks other chart) you can move the check of old values from de renderlet to the to a preRedraw listener.
.on("preRedraw", function(chart){
//Remove old values (if found)
chart.select('#inline-labels').remove();
})
Alternative
D3-ish way
Demo jsfiddle
.renderlet(function (chart) {
//Check if labels exist
var gLabels = chart.select(".labels");
if (gLabels.empty()){
gLabels = chart.select(".chart-body").append('g').classed('labels', true);
}
var gLabelsData = gLabels.selectAll("text").data(chart.selectAll(".bar")[0]);
gLabelsData.exit().remove(); //Remove unused elements
gLabelsData.enter().append("text") //Add new elements
gLabelsData
.attr('text-anchor', 'middle')
.attr('fill', 'white')
.text(function(d){
return d3.select(d).data()[0].data.value
})
.attr('x', function(d){
return +d.getAttribute('x') + (d.getAttribute('width')/2);
})
.attr('y', function(d){ return +d.getAttribute('y') + 15; })
.attr('style', function(d){
if (+d.getAttribute('height') < 18) return "display:none";
});
})