While following the tutorial on creating a bar chart, I encountered an issue in step three. The bars are rotated to columns, but I am struggling to iterate over a JSON dataset and add Y-axis labels for each bar using the name attribute from the returned JSON data.
You can view my code on jsfiddle here
Below are the code samples:
The JSON data loaded:
[
{
"name": "1-30 days",
"value": "22"
},
{
"name": "31-60 days",
"value": "14"
},
{
"name": "61-90 days",
"value": "1"
}
]
My D3 code:
var width = 420,
barHeight = 20;
var x = d3.scale.linear()
.range([0, width]);
var chart = d3.select(".chart")
.attr("width", width);
d3.json("<?=APP_PATH?>/query", function(error, data) {
x.domain([0, d3.max(data, function(d) { return d.value; })]);
chart.attr("height", barHeight * data.length);
var bar = chart.selectAll("g")
.data(data)
.enter().append("g")
.attr("transform", function(d, i) { return "translate(0," + i * barHeight + ")"; });
bar.append("rect")
.attr("width", function(d) { return x(d.value); })
.attr("height", barHeight - 1);
bar.append("text")
.attr("x", function(d) { return x(d.value) - 3; })
.attr("y", barHeight / 2)
.attr("dy", ".35em")
.text(function(d) { return d.value; });
});
function type(d) {
d.value = +d.value; // coerce to number
return d;
}