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sxywu/.block Secret

Last active March 28, 2017 07:53
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Selections: Update-Exit example
Raw
.block
license: mit
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
svg {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<svg></svg>
<script>
var rectWidth = 100;
var height = 300;
var data = [
[100, 250, 175, 200, 120],
[230, 120, 300, 145, 75, 250],
[240, 250, 100]
];
var colors = d3.scaleOrdinal(d3.schemeCategory10);
var svg = d3.select('svg');
function updateBars(data) {
var bars = svg.selectAll('rect')
.data(data, d => d);
// exit
bars.exit().remove();
// enter
var enter = bars.enter().append('rect')
.attr('width', rectWidth)
.attr('stroke', '#fff');
// enter + update
bars = enter.merge(bars)
.attr('x', (d, i) => i * rectWidth)
.attr('y', d => height - d)
.attr('height', d => d)
.attr('fill', d => colors(d));
}
var index = 0;
setInterval(() => {
updateBars(data[index % 3]);
index += 1;
}, 2500);
</script>
</body>
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