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Nested General Update Pattern
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license: mit |
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<!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> |
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