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Selections: update-exit example
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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; } | |
| svg { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <svg></svg> | |
| <script> | |
| var rectWidth = 100; | |
| var height = 300; | |
| var data = [ | |
| [100, 250, 175, 200, 120], | |
| [230, 120, 300, 145, 75, 250], | |
| [240, 250, 100] | |
| ]; | |
| var colors = d3.scaleOrdinal(d3.schemeCategory10); | |
| var svg = d3.select('svg'); | |
| function updateBars(data) { | |
| var bars = svg.selectAll('rect') | |
| .data(data, d => d); | |
| // exit | |
| bars.exit().remove(); | |
| // enter | |
| var enter = bars.enter().append('rect') | |
| .attr('width', rectWidth) | |
| .attr('stroke', '#fff'); | |
| // enter + update | |
| bars = enter.merge(bars) | |
| .attr('x', (d, i) => i * rectWidth) | |
| .attr('y', d => height - d) | |
| .attr('height', d => d) | |
| .attr('fill', d => colors(d)); | |
| } | |
| var index = 0; | |
| setInterval(() => { | |
| updateBars(data[index % 3]); | |
| index += 1; | |
| }, 2500); | |
| </script> | |
| </body> | |
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