Created
December 18, 2014 06:35
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china population choropleth
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| var formatNumber = d3.format(",f") | |
| var bodyNode = d3.select('body').node() | |
| var Choropleth = function(json, options) { | |
| var container = options.container || 'body' | |
| var projection = options.projection | |
| var w = options.width || 960 | |
| var h = options.height || 600 | |
| var colorScale = options.colorScale | |
| var colors = options.colors | |
| var path = options.path | |
| var tooltip | |
| var svg = d3.select(container) | |
| .append('svg') | |
| .attr('width', w) | |
| .attr('height', h) | |
| svg.selectAll('path') | |
| .attr('class', 'province') | |
| .data(json.features) | |
| .enter() | |
| .append('path') | |
| .attr('d', path) | |
| .style('fill', function(d) { | |
| var total = d.properties.total | |
| if (total) { | |
| return colorScale(total) | |
| } else { | |
| return '#ccc' | |
| } | |
| }) | |
| .on('mouseover', function(d) { | |
| d3.select('body').selectAll('div.tooltip').remove() | |
| tooltip = d3.select('body').append('div') | |
| .attr('class', 'tooltip') | |
| .style('opacity', 0) | |
| }) | |
| .on('mousemove', function(d) { | |
| d3.select(this).transition().duration(300).style('opacity', 1) | |
| tooltip.transition().duration(300) | |
| .style('opacity', 1) | |
| var absoluteMousePos = d3.mouse(bodyNode) | |
| tooltip.text(d.properties.name + ' : ' + d.properties.total) | |
| .style('left', (absoluteMousePos[0] + 10) + 'px') | |
| .style('top', (absoluteMousePos[1] - 25) + 'px') | |
| }) | |
| .on('mouseout', function() { | |
| d3.select(this) | |
| .transition().duration(300) | |
| .style('opacity', 0.8) | |
| tooltip.transition().duration(300) | |
| .remove() | |
| }) | |
| // legend | |
| var legend = svg.selectAll('g.legend') | |
| .data(colors) | |
| .enter() | |
| .append('g') | |
| .attr('class', 'legend') | |
| var ls_w = 20, ls_h = 20 | |
| legend.append('rect') | |
| .attr('x', 20) | |
| .attr('y', function(d, i) { return h - (i*ls_h) - 2*ls_h }) | |
| .attr('width', ls_w) | |
| .attr('height', ls_h) | |
| .style('fill', function(d) { | |
| return d | |
| }) | |
| legend.append('text') | |
| .attr('x', 50) | |
| .attr('y', function(d, i){ return h - (i*ls_h) - ls_h - 4}) | |
| .text(function(d, i){ | |
| return formatNumber(colorScale.invertExtent(d)[0]) + ' - ' + formatNumber(colorScale.invertExtent(d)[1]) | |
| }) | |
| } | |
| var w = 960 | |
| var h = 600 | |
| var colors = ['rgb(237,248,233)', 'rgb(186,228,179)', 'rgb(116,196,118)', 'rgb(49,163,84)','rgb(0,109,44)'] | |
| var projection = d3.geo.mercator().center([105, 38]).scale(750).translate([w/2, h/2]) | |
| var path = d3.geo.path().projection(projection) | |
| var colorScale = d3.scale.quantize().range(colors) | |
| d3.csv('population.csv', function(data) { | |
| colorScale.domain([ d3.min(data, function(d) { return d.total }), d3.max(data, function(d) { return d.total })]) | |
| d3.json('china_provinces.json', function(json) { | |
| for (var i = 0; i < data.length; i++) { | |
| var dataProvince = data[i].name | |
| var total = parseInt(data[i].total) | |
| var male = parseInt(data[i].male) | |
| var female = parseInt(data[i].female) | |
| for (var j = 0; j < json.features.length; j++) { | |
| var jsonProvince = json.features[j].properties.name | |
| if (jsonProvince == dataProvince) { | |
| json.features[j].properties.total = total | |
| json.features[j].properties.male = male | |
| json.features[j].properties.female = female | |
| break | |
| } | |
| } | |
| } | |
| // draw the choropleth | |
| Choropleth(json, { | |
| container: 'body', | |
| colorScale: colorScale, | |
| width: w, | |
| height: h, | |
| path: path, | |
| colors: colors | |
| }) | |
| }) | |
| }) | |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>China population choropleth</title> | |
| <link rel="stylesheet" type="text/css" href="style.css" /> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="choropleth.js"></script> | |
| </body> | |
| </html> |
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| name | total | male | female | |
|---|---|---|---|---|
| 北京 | 1849475 | 941325 | 908150 | |
| 天津 | 1127589 | 581562 | 546027 | |
| 河北 | 7037620 | 3554766 | 3482854 | |
| 山西 | 3477805 | 1771808 | 1705997 | |
| 内蒙古 | 2310941 | 1186071 | 1124870 | |
| 辽宁 | 4252076 | 2138602 | 2113474 | |
| 吉林 | 2551123 | 1287411 | 1263712 | |
| 黑龙江 | 3465051 | 1749344 | 1715707 | |
| 上海 | 2253525 | 1151331 | 1102194 | |
| 江苏 | 7577122 | 3792269 | 3784853 | |
| 浙江 | 5400348 | 2761136 | 2639212 | |
| 安徽 | 5312628 | 2678455 | 2634173 | |
| 福建 | 3477491 | 1773098 | 1704393 | |
| 江西 | 4251692 | 2188051 | 2063641 | |
| 山东 | 9272503 | 4663609 | 4608894 | |
| 河南 | 9224288 | 4650716 | 4573572 | |
| 湖北 | 5226904 | 2658892 | 2568012 | |
| 湖南 | 6096586 | 3114294 | 2982292 | |
| 广东 | 9676589 | 5023631 | 4652958 | |
| 广西 | 4362551 | 2249997 | 2112554 | |
| 海南 | 826560 | 432579 | 393981 | |
| 重庆 | 2609882 | 1310663 | 1299219 | |
| 四川 | 8161604 | 4120256 | 4041348 | |
| 贵州 | 3332265 | 1714400 | 1617865 | |
| 云南 | 4467537 | 2300361 | 2167176 | |
| 西藏 | 265904 | 134009 | 131895 | |
| 陕西 | 3614887 | 1848641 | 1766246 | |
| 甘肃 | 2623094 | 1330609 | 1292485 | |
| 青海 | 535412 | 273891 | 261521 | |
| 宁夏 | 611957 | 311355 | 300602 | |
| 新疆 | 2086576 | 1061322 | 1025254 | |
| 香港 | 723480 | 334270 | 389210 | |
| 澳门 | 62400 | 30720 | 31680 | |
| 台湾 | 2322491 | 1164567 | 1157923 |
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| .province { | |
| fill: none; | |
| stroke: #aaa; | |
| stroke-width: 0.2px; | |
| stroke-linejoin: round; | |
| } | |
| div.tooltip { | |
| position: absolute; | |
| text-align: center; | |
| width: 100px; | |
| height: 18px; | |
| padding: 2px; | |
| font-size: 10px; | |
| background: #FFFFE0; | |
| border: 1px; | |
| border-radius: 2px; | |
| pointer-events: none; | |
| } | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: black; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| font-family: sans-serif; | |
| font-size: 11px; | |
| } |
I was having the same error message. Just go to the top of the .json file and erase the two commented-out lines at the top.
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returns error Uncaught TypeError: Cannot read property 'features' of null(…)