A simple example showing how to detect a double tap with d3.js, and an accompanying method for reusability.
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July 25, 2016 05:46
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Detecting double taps with d3.js
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <style> | |
| div { | |
| position: absolute; | |
| height:300px; | |
| width:300px; | |
| border:2px solid #000; | |
| text-align: center; | |
| line-height: 300px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div>Double tap inside the box</div> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/javascript"> | |
| d3.selection.prototype.dblTap = function(callback) { | |
| var last = 0; | |
| return this.each(function() { | |
| d3.select(this).on("touchstart", function(e) { | |
| if ((d3.event.timeStamp - last) < 500) { | |
| return callback(e); | |
| } | |
| last = d3.event.timeStamp; | |
| }); | |
| }); | |
| } | |
| d3.select("div").dblTap(function() { | |
| alert("Double tap!"); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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