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General Update Pattern Notes
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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; } | |
| </style> | |
| </head> | |
| <body> | |
| <!--svg width="960" height="500"></svg!--> | |
| <script> | |
| // Feel free to change or delete any of the code you see in this editor! | |
| function render(data){ | |
| // Managing one thing | |
| var svg = d3.select("body") | |
| .selectAll("svg") | |
| .data([null]); | |
| svg = svg | |
| .enter() | |
| .append("svg") | |
| .attr("width", 960) | |
| .attr("height", 500) | |
| .merge(svg); // merge enter, update selections, reasign svg into the merged selection | |
| var rects = svg//d3.select("svg") | |
| .selectAll("rect") | |
| .data(data); | |
| // .attr("cx", function (d) { return d; }) | |
| // .attr("fill", "orange"); | |
| rects | |
| .exit() | |
| .remove(); | |
| rects | |
| .enter() | |
| .append("rect") | |
| .attr("x", function(d) { return d; }) | |
| .attr("y", 100) | |
| .attr("width", 70) | |
| .attr("height", 300) | |
| .attr("fill", "green") | |
| .merge(rects) // so the cx applies to all rects (both new and old) | |
| .attr("cx", function(d){ return d; }); | |
| } | |
| // test cases (enter, update, exit) | |
| render([100]); | |
| render([300, 500, 700, 800, 880]); | |
| //render([300, 500]); | |
| render([]); | |
| // render([200, 400, 600, 800]); | |
| </script> | |
| </body> |
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