This example shows how adding geographic data with the .datum() function creates one large svg element instead of multiple elements. The hover effect highlights the element, which happens to be the entire extent. Using .data() and .enter() will allow you to interact with each element separately because each is created in a separate iteration. See how to interact with topojson files.
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December 20, 2015 21:09
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D3: .datum() test
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| <!DOCTYPE html> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"> | |
| <style> | |
| .states { | |
| fill: #e5e5e5; | |
| stroke: #fff; | |
| stroke-width:2px; | |
| } | |
| .states:hover { | |
| fill: steelblue; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| var projection = d3.geo.albersUsa() | |
| .scale(1000) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| queue() | |
| .defer(d3.json, "/svmatthews/raw/6083585/us.json") | |
| .await(makeMyMap); | |
| function makeMyMap(error, us){ | |
| svg.append('path') | |
| .datum(topojson.feature(us, us.objects.usStates)) | |
| .attr('d', path) | |
| .attr('class', 'states'); | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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