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Simple Bar and XY line graph in D3.JS

December 4, 2014, 11:04 pm

A basic bargraph, as simple as it can be made, largely hacked from various tutorials. It looks like this:

bar

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<html>
<body>
<svg class="output" width="500" height="500">
</svg>
 
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
 
var svg = d3.select(".output")
 
var mydata = [127, 61, 256, 71];
 
var selection = svg.selectAll("rect")
  .data(mydata)
 
selection.enter().append("rect")
  .attr("x", 0)
  .attr("y", function(d,i) { return i*90+50 })
  .attr("width", function(d,i) { return d; })
  .attr("height", 20)
  .style("fill", "steelblue")
 
</script>
</body>
</html>

The linegraph looks like this:
line

And is again as simple as I could get it. The data contains no X axis coordinate, and is just a flat array. In order to plot this a function provided to D3 infers the X axis from the datapoints index.

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<html>
 
<style>
path {
    stroke: steelblue;
    stroke-width: 2;
    fill: none; //important
}
</style>
 
<body>
 
 
<svg class="output" width="500" height="500">
</svg>
 
<script src="http://d3js.org/d3.v3.min.js"></script>
 
<script>
var svg = d3.select(".output")
 
var mydata = [127, 61, 256, 71, 10,10,10,10,10,10,100];
 
var selection = svg.selectAll("line")
  .data(mydata)
 
var valueline = d3.svg.line()
    .x(function(d,i) { return i*10; })
    .y(function(d,i) { return d; });
 
selection.enter().append("path")
  .attr("class", "line")
  .attr("d", valueline(mydata))
</script>
</body>
</html>
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