dc
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A multi-dimensional charting library built to work natively with crossfilter and rendered using d3.js
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HTML
<html lang="en">
<head>
<title>dc.js - Range / Focus with Dynamic Data</title>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="../css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="../css/dc.css"/>
</head>
<body>
<div class="container">
<script type="text/javascript" src="header.js"></script>
<p>This example shows how to display dynamically changing data with a range/focus chart
pair. In particular, the focus chart should display the changing X domain unless a brush is
active in the range chart.</p>
<p>By default, data is only added; append `?remove=1` to the URL to remove data as well
(exhibits weird transitions due to <a href="https://github.com/dc-js/dc.js/issues/507">#507</a>).</p>
<div id="focus"></div>
<div id="range"></div>
<script type="text/javascript" src="../js/promise-polyfill.js"></script>
<script type="text/javascript" src="../js/fetch.umd.js"></script>
<script type="text/javascript" src="../js/d3.js"></script>
<script type="text/javascript" src="../js/crossfilter.js"></script>
<script type="text/javascript" src="../js/dc.js"></script>
<style>
</style>
<script type="text/javascript">
const urlParams = new URLSearchParams(window.location.search),
remove = urlParams.get('remove');
var focus = dc.lineChart("#focus");
var zoom = dc.lineChart("#range");
d3.csv("morley.csv").then(function(experiments) {
experiments.forEach(function(x) {
x.Speed = +x.Speed;
});
var ndx = crossfilter(experiments),
runDimension = ndx.dimension(function(d) {return +d.Run;}),
speedSumGroup = runDimension.group().reduceSum(function(d) {return d.Speed * d.Run / 1000;});
focus
.width(768)
.height(400)
.x(d3.scaleLinear().domain([6,20]))
.evadeDomainFilter(true)
.elasticY(true)
.brushOn(false)
.yAxisLabel("This is the Y Axis!")
.dimension(runDimension)
.group(speedSumGroup)
.rangeChart(zoom);
function expand_focus() {
// if the chart were not storing the original domain, this is all we'd
// need to do have the focus chart elasticX when not zoomed:
//focus.elasticX(!zoom.filters().length);
// instead, we'll need to set the x scale each time, and calculate domain
if(!zoom.filters().length) {
var xExtent = d3.extent(speedSumGroup.all(), kv => kv.key);
focus.x(focus.x().domain(xExtent));
}
}
focus.on('preRender', expand_focus);
focus.on('preRedraw', expand_focus);
zoom
.width(768)
.height(80)
.x(d3.scaleLinear().domain([6,20]))
.elasticX(true)
.elasticY(true)
.brushOn(true)
.yAxisLabel("")
.dimension(runDimension)
.group(speedSumGroup);
dc.renderAll();
var run = 21;
setInterval(
() => {
ndx.add([{Expt: 6, Run: run++, Speed: 5000 + 5 * run}]);
if(remove)
ndx.remove(d => d.Run < run-20);
dc.redrawAll()
},
5000);
});
</script>
</div>
</body>
</html>