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December 15, 2018 01:57
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Enter+Update merge
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| license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!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> | |
| <script> | |
| // 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("update").attr("y", 100) | |
| .attr("font-size", 36) | |
| .on("click", () => { | |
| data[0].counter += 1 | |
| update() | |
| }) | |
| const data = [ | |
| {id: 123, counter:0} | |
| ] | |
| const update = () => { | |
| const counter = | |
| d3.select("svg").selectAll("text.counter") | |
| //d3.selectAll("text.counter") | |
| .data(data, c=>c.id) | |
| counter | |
| .enter() | |
| .append("text") | |
| .attr("class","counter") | |
| .merge(counter) | |
| .text(c => c.counter) | |
| } | |
| update() | |
| </script> | |
| </body> |
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