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Animate with the General Update Pattern in D3
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| license: mit |
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| <!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; } | |
| .chart { | |
| background: lightgray; | |
| border: 1px solid black; | |
| } | |
| rect { | |
| fill: steelblue; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="chart"></div> | |
| <button onclick="render('math')">Math</button> | |
| <button onclick="render('science')">Science</button> | |
| <button onclick="render('language')">Language</button> | |
| <script> | |
| var data = [ | |
| { | |
| "name": "Alice", | |
| "math": 137, | |
| "science": 62, | |
| "language": 54 | |
| }, | |
| { | |
| "name": "Billy", | |
| "math": null, | |
| "science": 34, | |
| "language": 85 | |
| }, | |
| { | |
| "name": "Cindy", | |
| "math": 86, | |
| "science": 48, | |
| "language": null | |
| }, | |
| { | |
| "name": "David", | |
| "math": 44, | |
| "science": null, | |
| "language": 65 | |
| }, | |
| { | |
| "name": "Emily", | |
| "math": 59, | |
| "science": 63, | |
| "language": 29 | |
| } | |
| ] | |
| // Feel free to change or delete any of the code you see in this editor! | |
| // var svg = d3.select("body").append("svg") | |
| // .attr("width", 960) | |
| // .attr("height", 500) | |
| // svg.append("text") | |
| // .text("Edit the code below to change me!") | |
| // .attr("y", 200) | |
| // .attr("x", 120) | |
| // .attr("font-size", 36) | |
| // .attr("font-family", "monospace") | |
| var margin = { top: 10, right: 25, bottom: 35, left: 20 } | |
| var width = 800 - margin.left - margin.right | |
| var height = 600 - margin.top - margin.bottom | |
| var svg = d3.select('.chart') | |
| .append('svg') | |
| .attr('width', width + margin.left + margin.right) | |
| .attr('height', height + margin.top + margin.bottom) | |
| .call(responsivefy) | |
| .append('g') | |
| .attr('transform', `translate(${margin.left}, ${margin.top})`) | |
| var xScale = d3.scaleBand() | |
| .domain(data.map(d => d.name)) | |
| .range([0, width]) | |
| .padding(0.2) | |
| var xAxis = d3.axisBottom(xScale) | |
| svg.append('g') | |
| .attr('transform', `translate(0, ${height})`) | |
| .call(xAxis) | |
| var yScale = d3.scaleLinear() | |
| .domain([0, 100]) | |
| .range([height, 0]) | |
| // var yAxis = d3.axisLeft(yScale) | |
| // .ticks(10) | |
| var yAxis = svg.append('g') | |
| .attr('transform', `translate(${margin.left}, ${margin.top})`) | |
| .call(d3.axisLeft(yScale)) | |
| function render (subject = 'math') { | |
| var t = d3.transition().duration(500); | |
| var update = svg.selectAll('rect') | |
| .data(data.filter(d => d[subject]), d => d.name); | |
| update.exit() | |
| .transition(t) | |
| .attr('y', height) | |
| .attr('height', 0) | |
| .remove(); | |
| yScale.domain([0, d3.max(data, d => d[subject])]) | |
| yAxis | |
| .transition(t) | |
| .delay(1000) | |
| .call(d3.axisLeft(yScale)) | |
| update | |
| .transition(t) | |
| .delay(1000) | |
| .attr('y', d => yScale(d[subject])) | |
| .attr('height', d => height - yScale(d[subject])); | |
| update | |
| .enter() | |
| .append('rect') | |
| .attr('y', height) | |
| .attr('height', 0) | |
| .attr('x', d => xScale(d.name)) | |
| .attr('width', d => xScale.bandwidth()) | |
| .transition(t) | |
| .delay(update.exit().size() ? 2000 : 0) | |
| .attr('y', d => yScale(d[subject])) | |
| .attr('height', d => height - yScale(d[subject])); | |
| } | |
| render(); | |
| function responsivefy(svg) { | |
| // get container + svg aspect ratio | |
| var container = d3.select(svg.node().parentNode), | |
| width = parseInt(svg.style("width")), | |
| height = parseInt(svg.style("height")), | |
| aspect = width / height; | |
| // add viewBox and preserveAspectRatio properties, | |
| // and call resize so that svg resizes on inital page load | |
| svg.attr("viewBox", "0 0 " + width + " " + height) | |
| .attr("preserveAspectRatio", "xMinYMid") | |
| .call(resize); | |
| // to register multiple listeners for same event type, | |
| // you need to add namespace, i.e., 'click.foo' | |
| // necessary if you call invoke this function for multiple svgs | |
| // api docs: https://github.com/mbostock/d3/wiki/Selections#on | |
| d3.select(window).on("resize." + container.attr("id"), resize); | |
| // get width of container and resize svg to fit it | |
| function resize() { | |
| var targetWidth = parseInt(container.style("width")); | |
| svg.attr("width", targetWidth); | |
| svg.attr("height", Math.round(targetWidth / aspect)); | |
| } | |
| } | |
| </script> | |
| </body> |
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