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d3.js tutorial @BIDS 3/3/2015
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| // This is called a closure which makes sure that all variables stay local. | |
| // Start script when everything is loaded properly. | |
| window.onload = (function () { | |
| var data = [10, 20, 30]; | |
| var canvas = d3.select('#canvas').append('svg:svg'); | |
| var update = function (data) { | |
| // This selection is the same for appending, updating, and removing elements | |
| // for this reason I am using a variable here. I think this pattern makes it | |
| // little bit more clear why we are using selectAll here | |
| var circles = canvas.selectAll('circle').data(data); | |
| // Append new data points. | |
| circles.enter().append('circle'); | |
| // Updating existing data points (including the ones created above). | |
| circles | |
| .attr('cx', function (d, i) {return d * 6}) | |
| .attr('cy', 40) | |
| .attr('r', function (d, i) {return d}) | |
| .attr('fill', 'blue') | |
| // modify data on mouse click event, then update viz | |
| .on('click', function (d, i) { | |
| data.splice(i, 1); | |
| update(data); | |
| }); | |
| // Remove elements that are not longer covered by data. | |
| circles.exit().remove(); | |
| }; | |
| update(data); | |
| }()) |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <div id="canvas"></div> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="d3tutorial.js"></script> | |
| </body> | |
| </html> |
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