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bar_chart_labels.html
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bar_chart_labels.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: SVG bar chart with value labels</title>
<script type="text/javascript" src="../d3/d3.js"></script>
<style type="text/css">
/* No style rules here yet */
</style>
</head>
<body>
<p id="add">Add a new data value</p>
<p id="remove">Remove a data value</p>
<script type="text/javascript">
//Width and height
var w = 600;
var h = 250;
var dataset = [ { key: 0, value: 5 },
{ key: 1, value: 10 },
{ key: 2, value: 13 },
{ key: 3, value: 19 },
{ key: 4, value: 21 },
{ key: 5, value: 25 },
{ key: 6, value: 22 },
{ key: 7, value: 18 },
{ key: 8, value: 15 },
{ key: 9, value: 13 },
{ key: 10, value: 11 },
{ key: 11, value: 12 },
{ key: 12, value: 15 },
{ key: 13, value: 20 },
{ key: 14, value: 18 },
{ key: 15, value: 17 },
{ key: 16, value: 16 },
{ key: 17, value: 18 },
{ key: 18, value: 23 },
{ key: 19, value: 25 } ];
var xScale = d3.scale.ordinal()
.domain(d3.range(dataset.length))
.rangeRoundBands([0, w], 0.05);
var yScale = d3.scale.linear()
.domain([0, d3.max(dataset, function(d) { return d.value; } )])
.range([0, h]);
//Define the key function, to be used when data binding.
var key = function(d) {
return d.key;
};
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset, key)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.rangeBand())
.attr("height", function(d) {
return yScale(d.value);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + (d.value * 10) + ")";
});
//Create labels
svg.selectAll("text")
.data(dataset, key)
.enter()
.append("text")
.text(function(d) {
return d.value;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.rangeBand() / 2;
})
.attr("y", function(d) {
return h - yScale(d.value) + 14;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
//On click, update with new data
d3.selectAll("p")
.on("click", function() {
//See which p was clicked
var paragraphID = d3.select(this).attr("id");
//Decide what to do next
if (paragraphID == "add") {
//Add a data value
var maxValue = 25;
var newNumber = Math.floor(Math.random() * maxValue);
var lastKeyValue = dataset[dataset.length - 1].key;
console.log(lastKeyValue);
dataset.push({
key: lastKeyValue + 1,
value: newNumber
});
} else {
//Remove a value
dataset.shift(); //Remove one value from dataset
}
//Update scale domains
xScale.domain(d3.range(dataset.length));
yScale.domain([0, d3.max(dataset, function(d) { return d.value; })]);
//Select…
var bars = svg.selectAll("rect")
.data(dataset, key);
//Enter…
bars.enter()
.append("rect")
.attr("x", w)
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.rangeBand())
.attr("height", function(d) {
return yScale(d.value);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + (d.value * 10) + ")";
});
//Update…
bars.transition()
.duration(500)
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.rangeBand())
.attr("height", function(d) {
return yScale(d.value);
});
//Exit…
bars.exit()
.transition()
.duration(500)
.attr("x", -xScale.rangeBand())
.remove();
//Update all labels
//Select…
var labels = svg.selectAll("text")
.data(dataset, key);
//Enter…
labels.enter()
.append("text")
.text(function(d) {
return d.value;
})
.attr("text-anchor", "middle")
.attr("x", w)
.attr("y", function(d) {
return h - yScale(d.value) + 14;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
//Update…
labels.transition()
.duration(500)
.attr("x", function(d, i) {
return xScale(i) + xScale.rangeBand() / 2;
});
//Exit…
labels.exit()
.transition()
.duration(500)
.attr("x", -xScale.rangeBand())
.remove();
});
</script>
</body>
</html>