connecttech2016/bar-chart-transitions.html at master · cmorrow/connecttech2016 · GitHub

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<!doctype html>
<html>

	<head>
	    <meta charset="utf-8">
	    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
	    <title>Bar Chart v5 - Transitions</title>
	    <link rel="stylesheet" type="text/css" href="css/samples.css">

	    <style type="text/css" media="screen">
	    	div.bar {
					background-color: orange;
					height: 20px;
					padding: 5px 0;
					margin-bottom: 5px;
					color: #000;
					font-size: 24px;
					font-weight: bold;
				}

				div:after {
					content: ' ';
					display:table;
					clear: both;
				}

				div.bar .value {
					font-family: Arial;
					float:right;
					margin-right: 5px;
				}

	    </style>
	</head>
	<body class="sample">

		<div class="container">
			<h1>A Bar Chart v5 - Transitions</h1>
			<div id="barChartDiv"></div>
		</div>
		<!-- list will be inserted/appended here -->

	</body>
	<script src="js/lib/d3.v4.min.js"></script>
	<script>
		(function(){
		  /* global d3 */

		  var container = d3.select('#barChartDiv'),
		      max,
		      transDuration = 1000,
		      enter, update, exit,
		      firstRender;

		  // set the scales
		  var xScale = d3.scaleLinear().rangeRound([0, 100]);

		  var colorScale = d3.scaleQuantile()
		  .range(["red", "yellow", "lime"]);


		  function render(data) {

		    var trans = d3.transition()
		    .duration(transDuration)
		    .ease(d3.easeQuadOut);

		    // set scales
		    xScale
		    .domain([0, d3.max(data, function(d){
		      return d.sales;
		    })])
		    .range([0,100]);

		    colorScale.domain(xScale.domain());

		    // append the rectangles for the bar chart
		    var bar = container.selectAll('div');

		    update = bar.data(data, function(d){
		      return d.index;
		    });

		    update.select('span')
		    .text(function(d){
		      return d.sales;
		    });

		    enter = update.enter().append('div');

		    enter
		    .style('width', '0%')
		    .attr('class', 'bar')
		    .merge(update)
		    .transition(trans)
		    .style('background-color', getBgColor)
		    .styleTween('width', function(d) {
		      return d3.interpolateString(this.style.width, xScale(d.sales) + '%');
		    });


		    enter.append('span')
		    .attr('class', 'value')
		    .text(function(d){
		      return d.sales;
		    });

		    setTimeout(function(){
		      getData(10, [50, 300]);
		    }, transDuration * 1.5);

		  }

		  // accessor function to return color based on "sales" value
		  function getBgColor(d){
		    return colorScale(d.sales);
		  }

		  function getData(count, range){
		    var arr = [];
		    d3.range(count).map(function(val){

		      var obj = {
		        index: val,
		        sales: Math.random() * (range[1]-1) | range[0]
		      };
		      arr.push(obj);
		    });

		    max = d3.max(arr);

		    render(arr);
		  }

		  function sortDesc(a, b) {
		    return a.sales < b.sales;
		  }

		  // get data for first time
		  getData(10, [50, 300]);


		})();
	</script>
</html>