index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Shopping App Prototype</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
</head>
<body>
<svg width="960" height="500"></svg>
<script>
const xValue = d => d.price;
const yValue = d => d.name;
const textValue = d => `${d.name} $${d.price}`
const verticalSpacing = 60;
const svg = d3.select('svg');
const width = +svg.attr('width');
const margin = { left: 220, right: 220, top: 20, bottom: 20 };
const innerWidth = width - margin.left - margin.right;
const xScale = d3.scaleLinear().range([0, innerWidth]);
const yScale = d3.scaleBand()
.paddingInner(0.1)
.paddingOuter(0.05);
function render(selection, data){
xScale.domain([0, d3.max(data, xValue)]);
yScale
.domain(data.map(yValue))
.range([0, verticalSpacing * data.length]);
let g = selection.selectAll('g').data([null]);
g = g.enter().append('g')
.merge(g)
.attr('transform', `translate(${margin.left},${margin.top})`);
const groups = g.selectAll('g').data(data);
groups.exit().remove();
const groupsEnter = groups.enter().append('g');
groups
.merge(groupsEnter)
.attr('transform', d => `translate(0,${yScale(yValue(d))})`);
const rects = groupsEnter
.append('rect')
.attr('fill', 'steelblue')
.merge(groups.select('rect'))
.attr('width', d => xScale(xValue(d)))
.attr('height', yScale.bandwidth());
const text = groupsEnter
.append('text')
.style('font-size', '32pt')
.style('font-family', 'Sans-Serif')
.attr('x', 5)
.attr('dy', '0.32em')
.merge(groups.select('text'))
.attr('y', yScale.bandwidth() / 2)
.text(textValue);
}
render(svg, [ { name: 'Milk', price: 3 } ]);
setTimeout(() => {
render(svg, [ { name: 'Milk', price: 3 }, { name: 'Eggs', price: 20 } ]);
}, 1000);
setTimeout(() => {
render(svg, [ { name: 'Milk', price: 3 }, { name: 'Eggs', price: 2 } ]);
}, 2000);
setTimeout(() => {
render(svg, [
{ name: 'Milk', price: 3 },
{ name: 'Eggs', price: 2 },
{ name: 'Cupcakes', price: 5 }
]);
}, 3000);
setTimeout(() => {
render(svg, [ { name: 'Milk', price: 3 }, { name: 'Eggs', price: 2 } ]);
}, 4000);
</script>
</body>
</html>