Bar charts with auto-generated filter buttons

data.js

	  var data = 
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{"From":"MS", "Students":11, "To":"KY"},
{"From":"MS", "Students":3, "To":"OR"},
{"From":"MS", "Students":1, "To":"SD"},
{"From":"SC", "Students":3, "To":"WA"},{"From":"SC", "Students":3, "To":"DE"},
{"From":"SC", "Students":33, "To":"DC"},
{"From":"SC", "Students":4, "To":"WI"},
{"From":"SC", "Students":27, "To":"WV"},
{"From":"SC", "Students":2, "To":"HI"},{"From":"SC", "Students":134, "To":"FL"},
{"From":"SC", "Students":0, "To":"WY"},
{"From":"SC", "Students":8, "To":"NH"},
{"From":"SC", "Students":22, "To":"NJ"},
{"From":"SC", "Students":0, "To":"NM"},
{"From":"SC", "Students":28, "To":"TX"},
{"From":"SC", "Students":11, "To":"LA"},
{"From":"SC", "Students":358, "To":"NC"},
{"From":"SC", "Students":0, "To":"ND"},
{"From":"SC", "Students":1, "To":"NE"},
{"From":"SC", "Students":87, "To":"TN"},
{"From":"SC", "Students":63, "To":"NY"},
{"From":"SC", "Students":37, "To":"PA"},
{"From":"SC", "Students":29, "To":"CA"},
{"From":"SC", "Students":1, "To":"NV"},
{"From":"SC", "Students":92, "To":"VA"},
{"From":"SC", "Students":81, "To":"CO"},
{"From":"SC", "Students":0, "To":"AK"},
{"From":"SC", "Students":149, "To":"AL"},{"From":"SC", "Students":3, "To":"AR"},
{"From":"SC", "Students":8, "To":"VT"},
{"From":"SC", "Students":76, "To":"IL"},
{"From":"SC", "Students":352, "To":"GA"},
{"From":"SC", "Students":10, "To":"IN"},
{"From":"SC", "Students":149, "To":"IA"},
{"From":"SC", "Students":5, "To":"OK"},
{"From":"SC", "Students":310, "To":"AZ"},
{"From":"SC", "Students":0, "To":"ID"},
{"From":"SC", "Students":28, "To":"CT"},
{"From":"SC", "Students":7, "To":"ME"},
{"From":"SC", "Students":6, "To":"MD"},
{"From":"SC", "Students":18, "To":"MA"},{"From":"SC", "Students":43, "To":"OH"},
{"From":"SC", "Students":11, "To":"UT"},
{"From":"SC", "Students":13, "To":"MO"},
{"From":"SC", "Students":17, "To":"MN"},
{"From":"SC", "Students":14, "To":"MI"},
{"From":"SC", "Students":9, "To":"RI"},
{"From":"SC", "Students":4, "To":"KS"},
{"From":"SC", "Students":0, "To":"MT"},
{"From":"SC", "Students":28, "To":"MS"},
{"From":"SC", "Students":12850, "To":"SC"},
{"From":"SC", "Students":18, "To":"KY"},
{"From":"SC", "Students":5, "To":"OR"},
{"From":"SC", "Students":1, "To":"SD"},
{"From":"KY", "Students":4, "To":"WA"},{"From":"KY", "Students":1, "To":"DE"},
{"From":"KY", "Students":14, "To":"DC"},
{"From":"KY", "Students":6, "To":"WI"},
{"From":"KY", "Students":58, "To":"WV"},
{"From":"KY", "Students":1, "To":"HI"},{"From":"KY", "Students":59, "To":"FL"},
{"From":"KY", "Students":0, "To":"WY"},
{"From":"KY", "Students":0, "To":"NH"},
{"From":"KY", "Students":4, "To":"NJ"},
{"From":"KY", "Students":1, "To":"NM"},
{"From":"KY", "Students":28, "To":"TX"},
{"From":"KY", "Students":10, "To":"LA"},
{"From":"KY", "Students":18, "To":"NC"},
{"From":"KY", "Students":1, "To":"ND"},
{"From":"KY", "Students":4, "To":"NE"},
{"From":"KY", "Students":151, "To":"TN"},
{"From":"KY", "Students":61, "To":"NY"},
{"From":"KY", "Students":43, "To":"PA"},
{"From":"KY", "Students":25, "To":"CA"},
{"From":"KY", "Students":1, "To":"NV"},
{"From":"KY", "Students":48, "To":"VA"},
{"From":"KY", "Students":66, "To":"CO"},
{"From":"KY", "Students":2, "To":"AK"},
{"From":"KY", "Students":120, "To":"AL"},{"From":"KY", "Students":5, "To":"AR"},
{"From":"KY", "Students":0, "To":"VT"},
{"From":"KY", "Students":131, "To":"IL"},
{"From":"KY", "Students":66, "To":"GA"},
{"From":"KY", "Students":449, "To":"IN"},
{"From":"KY", "Students":107, "To":"IA"},
{"From":"KY", "Students":10, "To":"OK"},
{"From":"KY", "Students":206, "To":"AZ"},
{"From":"KY", "Students":0, "To":"ID"},
{"From":"KY", "Students":28, "To":"CT"},
{"From":"KY", "Students":1, "To":"ME"},
{"From":"KY", "Students":1, "To":"MD"},
{"From":"KY", "Students":18, "To":"MA"},{"From":"KY", "Students":609, "To":"OH"},
{"From":"KY", "Students":10, "To":"UT"},
{"From":"KY", "Students":40, "To":"MO"},
{"From":"KY", "Students":8, "To":"MN"},
{"From":"KY", "Students":24, "To":"MI"},
{"From":"KY", "Students":6, "To":"RI"},
{"From":"KY", "Students":5, "To":"KS"},
{"From":"KY", "Students":1, "To":"MT"},
{"From":"KY", "Students":40, "To":"MS"},
{"From":"KY", "Students":102, "To":"SC"},
{"From":"KY", "Students":13421, "To":"KY"},
{"From":"KY", "Students":1, "To":"OR"},
{"From":"KY", "Students":0, "To":"SD"},
{"From":"OR", "Students":555, "To":"WA"},{"From":"OR", "Students":0, "To":"DE"},
{"From":"OR", "Students":32, "To":"DC"},
{"From":"OR", "Students":16, "To":"WI"},
{"From":"OR", "Students":6, "To":"WV"},
{"From":"OR", "Students":21, "To":"HI"},{"From":"OR", "Students":29, "To":"FL"},
{"From":"OR", "Students":10, "To":"WY"},
{"From":"OR", "Students":5, "To":"NH"},
{"From":"OR", "Students":13, "To":"NJ"},
{"From":"OR", "Students":5, "To":"NM"},
{"From":"OR", "Students":94, "To":"TX"},
{"From":"OR", "Students":18, "To":"LA"},
{"From":"OR", "Students":10, "To":"NC"},
{"From":"OR", "Students":8, "To":"ND"},
{"From":"OR", "Students":8, "To":"NE"},
{"From":"OR", "Students":19, "To":"TN"},
{"From":"OR", "Students":106, "To":"NY"},
{"From":"OR", "Students":49, "To":"PA"},
{"From":"OR", "Students":582, "To":"CA"},
{"From":"OR", "Students":17, "To":"NV"},
{"From":"OR", "Students":18, "To":"VA"},
{"From":"OR", "Students":149, "To":"CO"},
{"From":"OR", "Students":15, "To":"AK"},
{"From":"OR", "Students":11, "To":"AL"},{"From":"OR", "Students":2, "To":"AR"},
{"From":"OR", "Students":7, "To":"VT"},
{"From":"OR", "Students":69, "To":"IL"},
{"From":"OR", "Students":25, "To":"GA"},
{"From":"OR", "Students":39, "To":"IN"},
{"From":"OR", "Students":58, "To":"IA"},
{"From":"OR", "Students":23, "To":"OK"},
{"From":"OR", "Students":274, "To":"AZ"},
{"From":"OR", "Students":108, "To":"ID"},
{"From":"OR", "Students":30, "To":"CT"},
{"From":"OR", "Students":21, "To":"ME"},
{"From":"OR", "Students":4, "To":"MD"},
{"From":"OR", "Students":55, "To":"MA"},{"From":"OR", "Students":30, "To":"OH"},
{"From":"OR", "Students":58, "To":"UT"},
{"From":"OR", "Students":11, "To":"MO"},
{"From":"OR", "Students":19, "To":"MN"},
{"From":"OR", "Students":21, "To":"MI"},
{"From":"OR", "Students":16, "To":"RI"},
{"From":"OR", "Students":8, "To":"KS"},
{"From":"OR", "Students":63, "To":"MT"},
{"From":"OR", "Students":4, "To":"MS"},
{"From":"OR", "Students":10, "To":"SC"},
{"From":"OR", "Students":3, "To":"KY"},
{"From":"OR", "Students":8324, "To":"OR"},
{"From":"OR", "Students":9, "To":"SD"},
{"From":"SD", "Students":5, "To":"WA"},{"From":"SD", "Students":0, "To":"DE"},
{"From":"SD", "Students":3, "To":"DC"},
{"From":"SD", "Students":6, "To":"WI"},
{"From":"SD", "Students":0, "To":"WV"},
{"From":"SD", "Students":3, "To":"HI"},{"From":"SD", "Students":3, "To":"FL"},
{"From":"SD", "Students":17, "To":"WY"},
{"From":"SD", "Students":1, "To":"NH"},
{"From":"SD", "Students":1, "To":"NJ"},
{"From":"SD", "Students":2, "To":"NM"},
{"From":"SD", "Students":12, "To":"TX"},
{"From":"SD", "Students":1, "To":"LA"},
{"From":"SD", "Students":18, "To":"NC"},
{"From":"SD", "Students":99, "To":"ND"},
{"From":"SD", "Students":201, "To":"NE"},
{"From":"SD", "Students":4, "To":"TN"},
{"From":"SD", "Students":5, "To":"NY"},
{"From":"SD", "Students":5, "To":"PA"},
{"From":"SD", "Students":16, "To":"CA"},
{"From":"SD", "Students":1, "To":"NV"},
{"From":"SD", "Students":4, "To":"VA"},
{"From":"SD", "Students":49, "To":"CO"},
{"From":"SD", "Students":1, "To":"AK"},
{"From":"SD", "Students":2, "To":"AL"},{"From":"SD", "Students":0, "To":"AR"},
{"From":"SD", "Students":0, "To":"VT"},
{"From":"SD", "Students":13, "To":"IL"},
{"From":"SD", "Students":2, "To":"GA"},
{"From":"SD", "Students":6, "To":"IN"},
{"From":"SD", "Students":102, "To":"IA"},
{"From":"SD", "Students":18, "To":"OK"},
{"From":"SD", "Students":31, "To":"AZ"},
{"From":"SD", "Students":2, "To":"ID"},
{"From":"SD", "Students":3, "To":"CT"},
{"From":"SD", "Students":0, "To":"ME"},
{"From":"SD", "Students":0, "To":"MD"},
{"From":"SD", "Students":4, "To":"MA"},{"From":"SD", "Students":3, "To":"OH"},
{"From":"SD", "Students":9, "To":"UT"},
{"From":"SD", "Students":11, "To":"MO"},
{"From":"SD", "Students":125, "To":"MN"},
{"From":"SD", "Students":5, "To":"MI"},
{"From":"SD", "Students":0, "To":"RI"},
{"From":"SD", "Students":21, "To":"KS"},
{"From":"SD", "Students":7, "To":"MT"},
{"From":"SD", "Students":2, "To":"MS"},
{"From":"SD", "Students":1, "To":"SC"},
{"From":"SD", "Students":2, "To":"KY"},
{"From":"SD", "Students":6, "To":"OR"},
{"From":"SD", "Students":3482, "To":"SD"}];

index.html

<!DOCTYPE html>
<html>
  <head>
	<title>Chart: Out-of-state college students</title>
  	<link href='http://fonts.googleapis.com/css?family=Oswald:400,300' rel='stylesheet' type='text/css'>
	  
	<style>
	  
  	h1 {
  		width: 600px; 
  		margin-bottom: 0; 
  		font-family: 'Oswald', sans-serif;
  		font-size: 36px;
  		text-transform: uppercase;
  		padding-left: 100px;
  	}
	
  	div#intro {
  		width: 600px;
  		margin-bottom: 0;
  		font-family: 'Oswald', sans-serif;
  		padding-left: 100px;
  		font-weight: 300;
  		font-size: 17px;
  	}
	
	  #controls {
		  width: 480px;
		  margin-left: 175px;;		  
	  }
	  
	  #controls ul {
		  list-style-type: none;
		  margin: 0;
		  padding: 0;		  
	  }
	  
	  li.button {
		  width: 30px;
		  height: 20px;
		  font-size: 13px;
		  font-family: 'Oswald', sans-serif;
		  border: 1px solid #9E8E8E;
		  border-radius: 5px;
		  text-align: center;
		  line-height: 20px;
		  margin-right: 3px;	
		  margin-bottom: 3px;
		  float: left;
		  cursor: pointer; 	  
	  }
	  
	  li.button:hover {
		  background-color: #C9E4F2;		
	  }
	  
	  .selected {
	  	background-color: #C9E4F2;
	  }
	  
	  .subhead {
		  font-size: 16px;
		  font-family: 'Oswald', sans-serif;
		  text-align: center;
	  }
	  
	  #charts-div {
		  margin-left: 80px;
		  margin-top: 30px;	
		  position: relative;	
	  }
	  
	  .charts {
		  float: left;
		  
	  }
	  
	  .axis path,
	  .axis line {
		fill: none;
		stroke: black;
		shape-rendering: crispEdges;
	  }
			
	 .axis text {
		font-family: sans-serif;
		font-size: 11px;
	 }
	 
	 rect:hover {
		stroke: cyan;
	 }

	#tooltip {
		position: absolute;
		width: 170px;
		height: auto;
		padding: 10px;
		background-color: white;
		border: 1px solid #9E8E8E;
		-webkit-box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.4);
		-moz-box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.4);
		box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.4);
		pointer-events: none;
	}

	#tooltip.hidden {
		display: none;
	}

	#tooltip p {
		margin: 0;
		font-family: sans-serif;
		font-size: 14px;
		line-height: 20px;
	}
	
	 </style>
	    
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="data.js"></script>

  </head>

<body>
	
	    <h1>Where College Students Go to Study</h1>
	    <div id="intro"><p>This chart shows which states students from every state go to study. On the left are the chosen school states of students from the selected state. On the right are the states where students come from. </p>

	<p>Click on a state button to filter. Hover over bars for details.</p>
		</div>
		
	<div id="controls">
		<ul></ul>
	</div>
	<br style="clear:both">
	<div id="charts-div">
		<div class="charts" id="chart1"></div>
		<div class="charts" id="chart2"></div>
		<div id="tooltip" class="hidden">
			<p><span id="value">100</span>.</p>
		</div>
	</div>
	
	
	
  <script>	  
	
  var m = [30, 10, 10, 85],
	    w = 330 - m[1] - m[3],
	    h = 1000 - m[0] - m[2];
	
	
  // Draw filter buttons for each state
  var buttons = d3.select("#controls ul").selectAll("li");

  buttons.data(d3.map(data, function(d){return d["From"];}).keys().sort(d3.ascending))
  	.enter()
  	.append("li")
	.attr("class", "button")
  	.attr("id", function(d) {return d})
    .text( function(d) {return d});
	
	// Select first button (in this case, AK)
	d3.select("li").classed("selected", true);
	
  // Nest data for destination states and home states for loading into each bar chart
  var nestedTo = d3.nest().key(function(d) { return d.To; }).entries(data);
  var nestedFrom = d3.nest().key(function(d) { return d.From; }).entries(data);
	
	
  // Init first chart showing the destination states
  var chart1 = d3.select("#chart1").append("svg")
      .attr("width", w + m[1] + m[3])
      .attr("height", h + m[0] + m[2])
    .append("g")
      .attr("transform", "translate(" + m[0] + "," + m[0] + ")");
	
  // Init second chart showing home states  
  var chart2 = d3.select("#chart2").append("svg")
      .attr("width", w + m[1] + m[3])
      .attr("height", h + m[0] + m[2])
    .append("g")
      .attr("transform", "translate(" + m[0] + "," + m[0] + ")");
	  
	d3.select("#chart1")
		   .insert("p", "svg")
		   .attr("class", "subhead")
		   .text("Students studying in other states");
  
	d3.select("#chart2")
		   .insert("p", "svg")
		   .attr("class", "subhead")
		   .text("Students from other states");

  // Function to update chart when buttons are clicked
  d3.selectAll("li").on("click", function() {
	  d3.selectAll("li").classed("selected", false);
	  d3.select(this).classed("selected", true);
	  state = d3.select(this).attr("id");
	  updateCharts(state);		  
	  
	  });


function drawCharts(state) { 
	  
	  // Filter data for selected state
	  var filteredTo = nestedTo.filter(function(d) {
		  return d['key'] === state;
	  });
	  
	  var filteredFrom = nestedFrom.filter(function(d) {
		  return d['key'] === state;
	  })
	  
	  //debugger;
	  
	  // Accessor function to remove state if home state = destination state
	  function deleteDupeState(array) {
		  for (var i in array) {
			  if (array[i]['From'] == array[i]["To"]) {
				  array.splice(i, 1);
			  }
		  }
		  return array
	  }
	  	  
	  
	  // Get the array with data values from selected object
	  var studentsTo = deleteDupeState(filteredTo[0].values);
	  	  
	  var studentsFrom = deleteDupeState(filteredFrom[0].values);
	  
	  
	  // Set scales
	  var xTo = d3.scale.linear().domain([0, d3.max(studentsTo, function(d) { 
			  return d.Students })])
		  .range([0, w]);
		  
	  var xFrom = d3.scale.linear().domain([0, d3.max(studentsFrom, function(d) { 
			  return d.Students })])
		  .range([0, w]);
      
	  var y = d3.scale.ordinal().rangeBands([0, h], 0.3);
	  
	  // Set axes
	  var xAxisTo = d3.svg.axis().scale(xTo).orient("top").ticks(5).tickSize(4),
	  	  xAxisFrom = d3.svg.axis().scale(xFrom).orient("top").ticks(5).tickSize(4),
	      yAxis = d3.svg.axis().scale(y).orient("left").tickSize(0);
	  
	  
	  // First chart
	  var rects1 = chart1.selectAll("rect")
	  	.data(studentsFrom.sort(function(a, b) { 
                  return b['Students'] - a['Students'];
               }))
	  	.enter()
	  	.append("rect")
	  	.attr("x", 15)
	  	.attr("y", function (d, i ) {
	  		return i * (h/60);
	  	})
		.attr("width", 0)
		.attr("height", 15)
		.attr("fill", "#FE4237")
		.on("mouseover", tooltip)
	   .on("mouseout", function() {

			//Hide the tooltip
			d3.select("#tooltip").classed("hidden", true);
	
	   });
	   
	   rects1.transition()
	   		.duration(700)
	   .attr("width", function(d) {return xFrom(d.Students)});
		
		// Y-axis labels
		chart1.selectAll("text")
			.data(studentsFrom.sort(function(a, b) { 
                  return b['Students'] - a['Students'];
               }))
			.enter()
			.append("text")
			.text(function(d) {return d.To})
			.attr("text-anchor", "middle")
			.attr("x", 0)
			.attr("y", function(d, i) {
				 return i * (h/60)+10;
			   })
			.attr("font-family", "sans-serif")
			.attr("font-size", "11px")
			   
		
		// Add the x-axis	   
		chart1.insert("g", "svg")
				.attr("class", "axis")
				.attr("transform", "translate(15, -5)")
			   .call(xAxisFrom);
			   
			   
		// Second chart	   
	   	  var rects2 = chart2.selectAll("rect")
	   	  	.data(studentsTo.sort(function(a, b) { 
	                     return b['Students'] - a['Students'];
	                  }))
	   	  	.enter()
	   	  	.append("rect")
	   	  	.attr("x", 15)
	   	  	.attr("y", function (d, i ) {
	   	  		return i * (h/60);
	   	  	})
	   		.attr("width", 0)
	   		.attr("height", 15)
	   		.attr("fill", "#033450")
	 		.on("mouseover", tooltip)
	 	   .on("mouseout", function() {
	 			//Hide the tooltip
	 			d3.select("#tooltip").classed("hidden", true);	
	 	   });
		   
		   rects2.transition()
		   		.duration(700)
		  	 	.attr("width", function(d) {return xTo(d.Students)});
		
			// Y-axis labels
	   		chart2.selectAll("text")
	   			.data(studentsTo.sort(function(a, b) { 
                  return b['Students'] - a['Students'];
               }))
	   			.enter()
	   			.append("text")
	   			.text(function(d) {return d.From})
	   			.attr("text-anchor", "middle")
	   			.attr("x", 0)
	   			.attr("y", function(d, i) {
	   				 return i * (h/60)+10;
	   			   })
	   			.attr("font-family", "sans-serif")
	   			.attr("font-size", "11px")
	   		
			// X-axis
			chart2.insert("g", "svg")
	   			.attr("class", "axis")
	   			.attr("transform", "translate(15, -5)")
	   			.call(xAxisTo);	   
			
}


function tooltip(d) {
	//Get this bar's x/y values, then augment for the tooltip
	var xPosition = parseFloat(d3.select(this).attr("x") ) + 200 ;
	var yPosition = parseFloat(d3.select(this).attr("y") ) + 30 ;

	//Update the tooltip position and value
	d3.select("#tooltip")
		.style("left", xPosition + "px")
		.style("top", yPosition + "px")						
		.select("#value")
		.text(d.Students.toLocaleString() + " students from " + d.From + " go to school in " + d.To);

	//Show the tooltip
	d3.select("#tooltip").classed("hidden", false);	
		
}

function updateCharts(state) {
	chart1.selectAll("rect").remove();
	chart1.selectAll("text").remove();
	chart1.select(".axis").remove();
	chart2.selectAll("rect").remove();
	chart2.selectAll("text").remove();
	chart2.select(".axis").remove()
	drawCharts(state);		
}
 
	  
drawCharts("AK");
  
  
  </script>
<div style="clear:both"></div>
<p>Source:<a href="http://ies.ed.gov/">Insitute of Education Sciences</a></p> 
		
</body>

</html>