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Bar Chart Update Pattern
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <script src="script.js"></script> | |
| </body> | |
| </html> |
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| var margin = { top: 10, left: 10, bottom: 10, right: 10 }, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var main = d3.select("body").append("svg") | |
| .style({ | |
| width: width + margin.left + margin.right, | |
| height: height + margin.top + margin.bottom | |
| }) | |
| .append("g") | |
| .attr({ | |
| transform: "translate(" + [margin.left, margin.top] + ")" | |
| }); | |
| main.append("rect").attr({ | |
| width: width, height: height, fill: "none" | |
| }); | |
| var dataA = [ | |
| { name: "Joffrey", foo: 24, bar: 12 }, | |
| { name: "Tyrion", foo: 54, bar: 45 }, | |
| { name: "Arya", foo: 16, bar: 53 }, | |
| { name: "Cersei", foo: 78, bar: 34 } | |
| ]; | |
| var dataB = [ | |
| { name: "Tyrion", foo: 54, bar: 45 }, | |
| { name: "Cersei", foo: 78, bar: 34 }, | |
| { name: "Arya", foo: 45, bar: 53 }, | |
| { name: "Joffrey", foo: 24, bar: 12 }, | |
| { name: "Jon", foo: 92, bar: 18 } | |
| ]; | |
| var data = dataA; | |
| window.setInterval(function() { | |
| data = data == dataA ? dataB : dataA; | |
| update(); | |
| }, 1000); | |
| var x = d3.scale.ordinal() | |
| .rangeBands([0, width], 0.1, 1); | |
| var y = d3.scale.linear() | |
| .domain([0, 100]) | |
| .range([height, 0]); | |
| var color = d3.scale.category10(); | |
| update(); | |
| function update() { | |
| x.domain(data.map(function(d) { return d.name; })); | |
| var bar = main.selectAll(".bar").data(data, function(d) { return d.name; }); | |
| bar.enter().append("rect").classed("bar", true) | |
| .attr({ | |
| width: x.rangeBand(), | |
| height: 0, | |
| x: function(d, i) { return x(d.name); }, | |
| y: y(0) | |
| }) | |
| .style({ | |
| "fill-opacity": 0.5, | |
| "fill": function(d, i) { return color(d.name); } | |
| }); | |
| bar | |
| .transition() | |
| .attr({ | |
| width: x.rangeBand(), | |
| height: function(d) { return height - y(d.foo); }, | |
| x: function(d, i) { return x(d.name); }, | |
| y: function(d, i) { return y(d.foo); } | |
| }); | |
| bar.exit() | |
| .transition() | |
| .attr({ | |
| y: y(0), | |
| height: 0 | |
| }).remove(); | |
| } |
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