How to access secondary information within a topojson file and render it on the webpage.
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December 20, 2015 06:09
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D3: Interacting With Topojson Properties
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| <!DOCTYPE html> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"> | |
| <style> | |
| h1 { | |
| font-family:arial; | |
| font-size:2em; | |
| color:#333; | |
| } | |
| #info { | |
| position:absolute; | |
| top: 10px; | |
| left: 10px; | |
| } | |
| .states { | |
| fill: #e5e5e5; | |
| stroke: #fff; | |
| stroke-width:2px; | |
| } | |
| .states:hover { | |
| fill: steelblue; | |
| } | |
| </style> | |
| <body> | |
| <div id="info"><h1 id="name"></h1></div> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.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); | |
| d3.json('us.json', function(error, us) { | |
| svg.selectAll('.states') | |
| .data(topojson.feature(us, us.objects.usStates).features) | |
| .enter() | |
| .append('path') | |
| .attr('class', 'states') | |
| .attr('d', path) | |
| .on('mouseover', function(d){ | |
| var name = d.properties.STATE_ABBR; | |
| return document.getElementById('name').innerHTML=name; | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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