A look at Queue.js and how you can load multiple files before running the rest of the code. Simple visualization of populated places in the USA. Files loaded:
- US States - topojson
- Populated Places - geojson
Last active
October 22, 2024 19:09
-
-
Save mapsam/6090056 to your computer and use it in GitHub Desktop.
D3: Queue.js
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:1px; | |
| } | |
| .cities { | |
| fill: red; | |
| opacity:0.7; | |
| } | |
| </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, 'states.json') | |
| .defer(d3.json, 'cities.json') | |
| .await(makeMyMap); | |
| function makeMyMap(error, states, cities) { | |
| svg.append('path') | |
| .datum(topojson.feature(states, states.objects.usStates)) | |
| .attr('d', path) | |
| .attr('class', 'states'); | |
| svg.selectAll('.cities') | |
| .data(cities.features) | |
| .enter() | |
| .append('path') | |
| .attr('d', path.pointRadius(5)) | |
| .attr('class', 'cities'); | |
| } | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment