jpillora · May 30, 2014 10:24
diff --git a/line-graph.html b/line-graph.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>
 body {
  font: 10px sans-serif;
 }
 .axis path,
 .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
 }
 .x.axis path {
  display: none;
 }
 .line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
 }
 </style>
 <body>
 <script src="http://d3js.org/d3.v3.js"></script>
 <script>

 var margin = {top: 20, right: 80, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 200 - margin.top - margin.bottom;

 var parseDate = d3.time.format("%Y%m%d").parse;

 var x = d3.time.scale()
    .range([0, width]);

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

 var color = d3.scale.category10();

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

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

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

 var data = [
  {"title":"1", "date":"20140401", "value": 1},
  {"title":"2", "date":"20140415", "value": 1},
  {"title":"3", "date":"20140416", "value": 2},
  {"title":"4", "date":"20140422", "value": 2},
  {"title":"5", "date":"20140423", "value": 3},
  {"title":"6", "date":"20140502", "value": 2},
  {"title":"7", "date":"20140509", "value": 1}
 ];

 data.forEach(function(d) {
  d.date = parseDate(d.date);
 });

 color.domain(["data"]);

 x.domain(d3.extent(data, function(d) { return d.date; }));

 y.domain([
  d3.min(data, function(v) { return v.value; }),
  d3.max(data, function(v) { return v.value; })
 ]);

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

 svg.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("Entries");

 var set = svg.selectAll(".city")
    .data([ {name: "Values", values: data} ])
  .enter().append("g")
    .attr("class", "city");

 //line creation function
 var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.value); });

 set.append("path")
    .attr("class", "line")
    .attr("d", function(d) { return line(data); })
    .style("stroke", function(d) { return color(d.name); });

 </script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	body {
	font: 10px sans-serif;
	}
	.axis path,
	.axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}
	.x.axis path {
	display: none;
	}
	.line {
	fill: none;
	stroke: steelblue;
	stroke-width: 1.5px;
	}
	</style>
	<body>
	<script src="http://d3js.org/d3.v3.js"></script>
	<script>

	var margin = {top: 20, right: 80, bottom: 30, left: 50},
	width = 960 - margin.left - margin.right,
	height = 200 - margin.top - margin.bottom;

	var parseDate = d3.time.format("%Y%m%d").parse;

	var x = d3.time.scale()
	.range([0, width]);

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

	var color = d3.scale.category10();

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

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

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

	var data = [
	{"title":"1", "date":"20140401", "value": 1},
	{"title":"2", "date":"20140415", "value": 1},
	{"title":"3", "date":"20140416", "value": 2},
	{"title":"4", "date":"20140422", "value": 2},
	{"title":"5", "date":"20140423", "value": 3},
	{"title":"6", "date":"20140502", "value": 2},
	{"title":"7", "date":"20140509", "value": 1}
	];

	data.forEach(function(d) {
	d.date = parseDate(d.date);
	});

	color.domain(["data"]);

	x.domain(d3.extent(data, function(d) { return d.date; }));

	y.domain([
	d3.min(data, function(v) { return v.value; }),
	d3.max(data, function(v) { return v.value; })
	]);

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

	svg.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("Entries");

	var set = svg.selectAll(".city")
	.data([ {name: "Values", values: data} ])
	.enter().append("g")
	.attr("class", "city");

	//line creation function
	var line = d3.svg.line()
	.interpolate("basis")
	.x(function(d) { return x(d.date); })
	.y(function(d) { return y(d.value); });

	set.append("path")
	.attr("class", "line")
	.attr("d", function(d) { return line(data); })
	.style("stroke", function(d) { return color(d.name); });

	</script>