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>
<head>
<title>dc.js - Adjustable Threshold Example</title>
<link type="text/css" rel="stylesheet" href="../css/dc.css"/>
<link type="text/css" rel="stylesheet" href="../css/dc-floatleft.css"/>
<link rel="stylesheet" type="text/css" href="../css/bootstrap.min.css">
<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>
</head>
<body>
<div class="container">
<script type="text/javascript" src="header.js"></script>
<p>This example demonstrates assigning a threshold dynamically to a pie chart by creating a new dimension based on slider input.</p>
<div id="inputSlider">
<div><input type="range" id="slideRange" value="0.5" min="0" max="1.0" step="0.1" onchange="updateSlider(this.value)"></div>
Score threshold: <span id="sliderValue">0.5</label>
</div>
<div id="dc-coreAcc-piechart"></div>
<div id="dc-score-barchart"></div>
<script type="text/javascript">
var data = [
{ "book": "A", "scores": 45 },
{ "book": "B", "scores": 34 },
{ "book": "C", "scores": 54 },
{ "book": "D", "scores": 27 },
{ "book": "E", "scores": 70 },
{ "book": "F", "scores": 25 },
{ "book": "G", "scores": 92 },
{ "book": "H", "scores": 22 },
{ "book": "I", "scores": 40 },
{ "book": "J", "scores": 10 },
{ "book": "K", "scores": 40 }
];
//## Create Chart Objects
var scoreChart = dc.barChart("#dc-score-barchart")
.xAxisLabel('book_id')
.yAxisLabel('score');
var goodYesNoPieChart = dc.pieChart('#dc-coreAcc-piechart');
//### Create Crossfilter Dimensions and Groups
var ndx = crossfilter(data);
var all = ndx.groupAll();
var bookDimension = ndx.dimension(function (d) {return d.book;}),
bookscoresGroup = bookDimension.group().reduceSum(function(d) {return d.scores;});
//## score bar chart
scoreChart.width(320)
.height(320)
.dimension(bookDimension)
.group(bookscoresGroup)
.elasticY(true)
.x(d3.scaleBand())
.xUnits(dc.units.ordinal)
.colors(["orange"])
.yAxis().ticks(5);
//## pie chart
// reusable function to create threshold dimension
function coreCount_from_threshold() {
var scoreThreshold=document.getElementById('slideRange').value;
scoreThreshold=parseFloat(scoreThreshold);
if (isNaN(scoreThreshold)) {
scoreThreshold=0.5
}
return ndx.dimension(function (d) {
var maxNumber=80;
if (d.scores >maxNumber*scoreThreshold) {
return 'High';
} else {
return 'Low';
}
});
}
var coreCount = coreCount_from_threshold();
var coreCountGroup = coreCount.group();
goodYesNoPieChart
.width(320)
.height(320)
.radius(120)
.innerRadius(40)
.dimension(coreCount)
.title(function(d){return d.value;})
.group(coreCountGroup)
.label(function (d) {
if (goodYesNoPieChart.hasFilter() && !goodYesNoPieChart.hasFilter(d.key)) {
return d.key + '(0%)';
}
var label = d.key;
if (all.value()) {
label += '(' + Math.floor(d.value / all.value() * 100) + '%)';
}
return label;
})
dc.renderAll();
//## change slider score value to re-assign the data in pie chart
function updateSlider(slideValue) {
var sliderDiv = document.getElementById("sliderValue");
sliderDiv.innerHTML = slideValue;
coreCount.dispose();
coreCount = coreCount_from_threshold();
coreCountGroup = coreCount.group();
goodYesNoPieChart
.dimension(coreCount)
.group(coreCountGroup);
dc.redrawAll();
}
</script>
</div>
</body>
</html>