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comboTransition.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Dynamic labels: Add and Remove data in v4 (sample dataset from Scott Murray's excellent book Interactive Data Visualization for the Web)</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
</head>
<body>
<div>
<button style="color:dodgerblue; margin-bottom: 20px;">Update chart with new data values</button> </div>
<script type="text/javascript">
//Width and height
var w = 600;
var h = 500;
var padding = 30;
function getRandomSubarray(arr, size) {
var shuffled = arr.slice(0), i = arr.length, temp, index;
while (i--) {
index = Math.floor((i + 1) * Math.random());
temp = shuffled[index];
shuffled[index] = shuffled[i];
shuffled[i] = temp;
}
return shuffled.slice(0, size);
}
//Dynamic, random dataset
var dataset = []; //Initialize empty array
var numDataPoints = 200; //Number of dummy data points to create
var maxRange = Math.random() * 1000; //Max range of new values
for (var i = 0; i < numDataPoints; i++) { //Loop numDataPoints times
var newNumber1 = Math.floor(Math.random() * maxRange); //New random integer
var newNumber2 = Math.floor(Math.random() * maxRange); //New random integer
dataset.push([newNumber1, newNumber2]); //Add new number to array
}
//Create scale functions
var xScale = d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d[0]; })])
.range([padding, w - padding * 2]);
var yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d[1]; })])
.range([h - padding, padding]);
//Define X axis
var xAxis = d3.axisBottom()
.scale(xScale)
.ticks(5);
//Define Y axis
var yAxis = d3.axisLeft()
.scale(yScale)
.ticks(5);
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create circles
svg.selectAll("circle")
.data(dataset)
.enter()
.append("circle")
.attr("cx", function(d) {
return xScale(d[0]);
})
.attr("cy", function(d) {
return yScale(d[1]);
})
.attr("r", 2);
//Create X axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (h - padding) + ")")
.call(xAxis);
//Create Y axis
svg.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
//On click, update with new data
d3.select("button")
.on("click", function() {
//New values for dataset
var numValues = dataset.length; //Count original length of dataset
var maxRange = Math.random() * 1000; //Max range of new values
dataset = []; //Initialize empty array
for (var i = 0; i < numValues; i++) { //Loop numValues times
var newNumber1 = Math.floor(Math.random() * maxRange); //New random integer
var newNumber2 = Math.floor(Math.random() * maxRange); //New random integer
dataset.push([newNumber1, newNumber2]); //Add new number to array
}
//Update scale domains
xScale.domain([0, d3.max(dataset, function(d) { return d[0]; })]);
yScale.domain([0, d3.max(dataset, function(d) { return d[1]; })]);
//Update all circles
svg.selectAll("circle")
.data(dataset)
.transition()
.duration(1000)
.on("start", function() {
d3.select(this)
.attr("fill", getRandomSubarray(["magenta","chartreuse","yellow","dodgerblue"],1))
.attr("r", 10);
})
.attr("cx", function(d) {
return xScale(d[0]);
})
.attr("cy", function(d) {
return yScale(d[1]);
})
.on("end", function() {
d3.select(this)
.transition()
.duration(1000)
.attr("fill", "black")
.attr("r", 2);
});
//Update X axis
svg.select(".x.axis")
.transition()
.duration(1000)
.call(xAxis);
//Update Y axis
svg.select(".y.axis")
.transition()
.duration(1000)
.call(yAxis);
});
</script>
</body>
</html>