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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| text { | |
| font: bold 48px monospace; | |
| } | |
| .enter { | |
| fill: green; | |
| } | |
| .update { | |
| fill: #333; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v2.min.js?2.10.1"></script> | |
| <script> | |
| var alphabet = "abcdefghijklmnopqrstuvwxyz".split(""); | |
| var width = 960, | |
| height = 500; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(32," + (height / 2) + ")"); | |
| function update(data) { | |
| // DATA JOIN | |
| // Join new data with old elements, if any. | |
| var text = svg.selectAll("text") | |
| .data(data); | |
| // UPDATE | |
| // Update old elements as needed. | |
| text.attr("class", "update"); | |
| // ENTER | |
| // Create new elements as needed. | |
| text.enter().append("text") | |
| .attr("class", "enter") | |
| .attr("x", function(d, i) { return i * 32; }) | |
| .attr("dy", ".35em"); | |
| // ENTER + UPDATE | |
| // Appending to the enter selection expands the update selection to include | |
| // entering elements; so, operations on the update selection after appending to | |
| // the enter selection will apply to both entering and updating nodes. | |
| text.text(function(d) { return d; }); | |
| // EXIT | |
| // Remove old elements as needed. | |
| text.exit().remove(); | |
| } | |
| // The initial display. | |
| update(alphabet); | |
| // Grab a random sample of letters from the alphabet, in alphabetical order. | |
| var handler = function() { | |
| update(shuffle(alphabet) | |
| .slice(0, Math.floor(Math.random() * 26)) | |
| .sort()); | |
| }; | |
| svg.on('click', handler); | |
| // Shuffles the input array. | |
| function shuffle(array) { | |
| var m = array.length, t, i; | |
| while (m) { | |
| i = Math.floor(Math.random() * m--); | |
| t = array[m], array[m] = array[i], array[i] = t; | |
| } | |
| return array; | |
| } | |
| </script> |
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