This example demonstrates how to disambiguate a click from a zoom gesture using d3.event.defaultPrevented. Click and drag to pan, mousewheel to zoom, or click the background to briefly highlight it.
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May 31, 2016 15:23
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Zoom vs. Click
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <style> | |
| html, | |
| body { | |
| height: 100%; | |
| margin: 0; | |
| overflow: hidden; | |
| } | |
| svg { | |
| position: absolute; | |
| } | |
| rect { | |
| fill: white; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = self.frameElement ? 960 : innerWidth, | |
| height = self.frameElement ? 500 : innerHeight; | |
| var data = d3.range(20).map(function() { return [Math.random() * width, Math.random() * height]; }); | |
| var color = d3.scale.category10(); | |
| var zoom = d3.behavior.zoom() | |
| .on("zoom", zoomed); | |
| var svg = d3.select("body") | |
| .on("touchstart", nozoom) | |
| .on("touchmove", nozoom) | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var g = svg.append("g") | |
| .call(zoom); | |
| g.append("rect") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("click", clicked); | |
| var view = g.append("g") | |
| .attr("class", "view"); | |
| view.selectAll("circle") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("transform", function(d) { return "translate(" + d + ")"; }) | |
| .attr("r", 32) | |
| .style("fill", function(d, i) { return color(i); }); | |
| function zoomed() { | |
| view.attr("transform", "translate(" + d3.event.translate + ") scale(" + d3.event.scale + ")"); | |
| } | |
| function clicked(d, i) { | |
| if (d3.event.defaultPrevented) return; // zoomed | |
| d3.select(this).transition() | |
| .style("fill", "black") | |
| .transition() | |
| .style("fill", "white"); | |
| } | |
| function nozoom() { | |
| d3.event.preventDefault(); | |
| } | |
| </script> |
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