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.
Last active
December 20, 2015 21:09
-
-
Save mapsam/6195407 to your computer and use it in GitHub Desktop.
D3: .datum() test
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment