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forked from lazingor's block: Update child data when parent data is updated?
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May 14, 2019 21:43
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Update child data when parent data is updated? [UNLISTED]
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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> | |
| <script> | |
| var sampleData = [ [50,50], [100,100] ]; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", "500px") | |
| .attr("height", "400px") | |
| .attr("style", "background: #eee"); | |
| function update(dataArr) { | |
| var groups = svg.selectAll(".group").data(dataArr); | |
| var gsEnter = groups.enter().append("g").attr("class", "group"); | |
| gsEnter.append("rect") | |
| .attr("class", "myrect") | |
| .attr("width", "50px") | |
| .attr("height", "50px") | |
| .attr("fill", "black"); | |
| gsEnter.append("circle") | |
| .attr("class", "mycirc") | |
| .attr("r", "25px") | |
| .attr("fill", "blue"); | |
| console.warn("a",groups.size()) | |
| groups = groups.merge(gsEnter); | |
| console.warn("b",groups.size()) | |
| groups.selectAll(".myrect") | |
| .transition() | |
| .attr("x", function(d) { console.warn({d}); return d[0]; }) | |
| .attr("y", function(d) { return d[1]; }); | |
| groups.select(".mycirc") | |
| .transition() | |
| .attr("cx", function(d) { console.warn({d}); return d[0]+50; }) | |
| .attr("cy", function(d) { return d[1]; }); | |
| } | |
| update(sampleData); | |
| d3.select("body").append("button").text("Update").on("click", newData); | |
| function newData() { | |
| sampleData = [ [100,200], [150,300], [200,350] ]; | |
| update(sampleData); | |
| // What happens: the two already created rect+circle pairs stay where they are, and a new one is placed at [200,350] | |
| // What I want: the two already created rect+circle pairs to map to the new coordinates, and the new one to be created | |
| } | |
| </script> | |
| </body> |
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