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EmbraceLife/.block

Created August 2, 2016 05:48
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17.add-bar-space-transition
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.block
license: gpl-3.0
Raw
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Adding values and elements to a chart</title>
<script type="text/javascript" src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
/* No style rules here yet */
</style>
</head>
<body>
<p>Click on this text to add a new data value to the chart!</p>
<script type="text/javascript">
var w = 600;
var h = 250;
var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
var xScale = d3.scaleBand()
.domain(d3.range(dataset.length))
.rangeRound([0, w])
.padding(0.05);
var yScale = d3.scaleLinear()
.domain([0, d3.max(dataset)])
.range([h, 0]);
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return yScale(d);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return h - yScale(d);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + (d * 10) + ")";
});
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text(function(d) {
return d;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
return yScale(d) + 14;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
d3.select("p")
.on("click", function() {
var maxValue = 25;
var newNumber = Math.floor(Math.random() * maxValue);
dataset.push(newNumber);
// ---- Now, dataset is one element longer -------
// 1. data-input range is 1 element longer
// 2. bandwidth is smaller to fit 1 more bar
xScale.domain(d3.range(dataset.length));
yScale.domain([0, d3.max(dataset)]);
// ---- update dataset is same old dataset
var bars = svg.selectAll("rect")
.data(dataset);
bars.enter()
.append("rect")
// ---- this new bar is fixed outside far right ----------
.attr("x", w)
.attr("y", function(d) {
return yScale(d);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return h-yScale(d);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + (d * 10) + ")";
});
bars.transition()
.duration(500)
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return yScale(d);
})
// ---- this bandwidth is smaller than previous bandwidth-------
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return h - yScale(d);
});
var texts = svg.selectAll("text")
.data(dataset)
texts
.enter().append("text")
.text(function(d) {
return d;
})
.attr("x", function(d, i) {
return w;
})
.attr("y", function(d) {
return yScale(d) + 14;
});
texts
.transition()
.duration(500)
.text(function(d) {
return d;
})
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
return yScale(d) + 14;
})
.attr("text-anchor", "middle")
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
});
</script>
</body>
</html>
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