D3 basics svg with axes

render a chart in an svg element

by Dan Shahin

HTML

<script src="http://d3js.org/d3.v3.min.js"></script>
<svg class="chart">
    <defs>
    <linearGradient id="MyGradient" x1="0%" y1="0%" x2="0%" y2="100%">
      <stop offset="0%" style="stop-color:rgb(255,120,255);stop-opacity:1" />
      <stop offset="100%" style="stop-color:rgb(0,255,255);stop-opacity:1" />
    </linearGradient>
  </defs>
</svg>

CSS

.bar {
  fill: url(#MyGradient)  ;
}

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

JavaScript

var data = [
  {name: "Locke",    value:  4},
  {name: "Reyes",    value:  8},
  {name: "Ford",     value: 15},
  {name: "Jarrah",   value: 16},
  {name: "Shephard", value: 23},
  {name: "Shahin",     value: 42}
];



var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 600 - margin.left - margin.right,
    height = 400 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var y = d3.scale.linear()
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var chart = d3.select(".chart")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");


  x.domain(data.map(function(d) { return d.name; }));
  y.domain([0, d3.max(data, function(d) { return d.value; })]);

  chart.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  chart.append("g")
      .attr("class", "y axis")
      .call(yAxis);

  chart.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.name); })
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); })
      .attr("width", x.rangeBand());

  var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(10, "%");
chart.append("g")
    .attr("class", "y axis")
    .call(yAxis)
  .append("text")
    .attr("transform", "rotate(-90)")
    .attr("y", 6)
    .attr("dy", ".71em")
    .style("text-anchor", "end")
    .text("Frequency");