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July 26, 2017 19:04
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Use g containers with elements inside
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <html> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| #svg1 { | |
| border: thin solid red; | |
| } | |
| .circles { | |
| fill: red; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <svg id="svg1" width="60" height="60"></svg> | |
| <button id="update" type="text/button">Update</button> | |
| <button id="reset" type="text/button">Reset</button> | |
| <script> | |
| let inputData = [ | |
| { id: 1, x: 10, y: 10 }, | |
| { id: 2, x: 30, y: 30 }, | |
| { id: 3, x: 50, y: 50 }, | |
| ]; | |
| function join1(data) { | |
| // select the container elements | |
| let containers = d3.select("#svg1") | |
| .selectAll('.container') | |
| .data(data); | |
| // select entering elements and append a g element | |
| let enterSel = containers.enter() | |
| .append("g") | |
| .attr("class", "container"); | |
| // select exiting elements | |
| let exitSel = containers.exit(); | |
| // select elements that remain | |
| let mergeSel = containers.merge(enterSel); | |
| // add a text label to each container | |
| enterSel.append("text").attr("text", "label"); | |
| // add a circle to each container | |
| let circlesEnter = enterSel.append("circle"); | |
| // add styles and data to new and remaining elements | |
| let circlesMerge = mergeSel | |
| .select("circle") | |
| .attr("class", "circles") | |
| .attr("r", d => 10) | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y); | |
| // remove exiting elements | |
| exitSel.remove(); | |
| } | |
| join1(inputData); | |
| d3.select("#reset").on("click", function() { | |
| d3.select("#svg1").selectAll("g").remove(); | |
| inputData = [ | |
| { id: 1, x: 10, y: 10 }, | |
| { id: 2, x: 30, y: 30 }, | |
| { id: 3, x: 50, y: 50 }, | |
| ]; | |
| join1(inputData); | |
| }); | |
| d3.select("#update").on("click", function() { | |
| inputData = [ | |
| { id: 1, x: 10, y: 10 }, | |
| { id: 2, x: 40, y: 40 }, | |
| { id: 3, x: 10, y: 50 }, | |
| { id: 4, x: 50, y: 10 }, | |
| ]; | |
| join1(inputData); | |
| }); | |
| </script> | |
| </body> | |
| </html> | |
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