Remove transitions from d3 can make everything much simpler.
Created
March 17, 2015 01:37
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d3 now (d3 without transitions)
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| /* global d3 */ | |
| d3.selection.prototype.now = function(tagName, data, maker) { | |
| var key = function(v) { return v; }; | |
| if (maker === undefined) { | |
| maker = data; data = [1]; | |
| } | |
| var selection = this.selectAll(tagName) | |
| .data(data, key); | |
| selection.enter().append(tagName); | |
| selection.exit().remove(); | |
| selection.each(function(d) { | |
| maker(d3.select(this), d); | |
| }); | |
| return this; | |
| }; |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| position: relative; | |
| width: 960px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="d3now.js"></script> | |
| <script> | |
| var randomColors = [], numberOfColors = 20; | |
| for (var i = 0; i < 20; i++) { | |
| randomColors.push(['rgb(' + | |
| ~~(Math.random() * 255), | |
| ~~(Math.random() * 255), | |
| ~~(Math.random() * 255)].join(',') + ')'); | |
| } | |
| function draw() { | |
| d3.select(document.body) | |
| .now('input', function(element) { | |
| element | |
| .attr('type', 'range') | |
| .attr('min', 0) | |
| .attr('max', 20) | |
| .on('input', function() { | |
| numberOfColors = parseInt(this.value); | |
| draw(); | |
| }); | |
| }) | |
| .now('div', randomColors.slice(0, numberOfColors), function(element, color) { | |
| return element | |
| .style('background', color) | |
| .now('div', function(element) { | |
| element.text(color); | |
| }); | |
| }); | |
| } | |
| draw(); | |
| </script> | |
| </body> |
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