用下拉按鈕更新一張等值線地圖

Question

首先，請原諒我可憐的英語。
我正在使用網格地圖和外部csv進行項目工作。

網格圖不是由矩形或六邊形組成的，而是僅與將在末尾使用的任何種類的符號的質心組成。
所以我有一個Topojson文件，質心「ID」和質心「座標」。

外部CSV由多列組成，第一列具有相同的質心「ID」，另一列具有不同年份的值。

"ID","C2001","C2002","C2003","C2004","C2005","C2006","C2007","C2008","C2009","C2010","C2000" 
6050,"-5.55753","-5.55914","-5.75444","-5.76307","-5.81660","-5.99361","-6.02150","-6.15979","-5.73530","-6.30509","-5.52990" 
6051,"-5.55753","-5.55914","-5.75444","-5.76307","-5.81660","-5.99361","-6.02150","-6.15979","-5.73530","-6.30509","-5.52990" 

這裏是我的代碼

var width = 960, 
    height = 600; 

var options = [ 
    {date: "2000", selected: "+d.C2000"}, 
    {date: "2001", selected: "+d.C2001"}, 
    {date: "2002", selected: "+d.C2002"}, 
    {date: "2003", selected: "+d.C2003"}, 
    {date: "2004", selected: "+d.C2004"}, 
    {date: "2005", selected: "+d.C2005"}, 
    {date: "2006", selected: "+d.C2006"}, 
    {date: "2007", selected: "+d.C2007"}, 
    {date: "2008", selected: "+d.C2008"}, 
    {date: "2009", selected: "+d.C2009"}, 
    {date: "2010", selected: "+d.C2010"}, 
]; 


var color = d3.scale.threshold() 
    .domain([-1985, -1400, -1000, -700, -300, -100, -25, -0]) 
    .range(["#7f0000", "#b30000", "#d7301f", "#ef6548", "#fc8d59", "#fdbb84", "#fdd49e", "#fee8c8", "#fff7ec"]); 

var path = d3.geo.path() 
    .projection(null) 
    .pointRadius(1.5); 

var svg = d3.select("body").append("svg") 
    .attr("width", width) 
    .attr("height", height); 


queue() 
    .defer(d3.json, "CO2_light.json") 
    .defer(d3.csv, "tdd_CO2_emissions.csv") 
    .await(ready); 

function ready(error, centroid, CO2) { 

    var rateById = {}; 

    console.log(rateById); //To 

    //CO2.forEach(function(d) { rateById[+d.ID] = +d.C2000; }); WORKING FINE = value in rateById 
    CO2.forEach(function(d) { rateById[+d.ID] = options[0].selected; }); //NOT WORKING = inside rateById "+d.C2000" instead the value 

    svg.selectAll("path") 
     .data(topojson.feature(centroid, centroid.objects.CENTROID).features) 
     .enter().append("path") 
     .attr("class", "centerGrid") 
     .attr("d", path) 
     .style("fill", function(d) { return color(rateById[+d.properties.ID]); }); 

    d3.select(".loading").remove(); 

目前我離開按鈕，我的下一個問題，我下面

//CO2.forEach(function(d) { rateById[+d.ID] = +d.C2000; }); WORKING FINE = value in rateById 
CO2.forEach(function(d) { rateById[+d.ID] = options[0].selected; }); //NOT WORKING = inside rateById "+d.C2000" instead the value 

集中在這兩個線路如果我使用第一行我得到一個很好的網格地圖（see image），但如果我試圖從第二行options陣列訪問特定年份的值，並且執行console.log(rateById);我得到小號

Object 
6050: "+d.C2000" 
6051: "+d.C2000" 
6712: "+d.C2000" 

取而代之的是

Object 
6050: -6.30509 
6051: -6.30509 
6712: -7.0441 

Answer 1

固定在這裏：http://jsfiddle.net/z7sLdyu2/2/

2發生在你的代碼來完成：

首先，你的選項中選擇不應包含的JavaScript代碼是執行（+d.），但只有年份值：

var options = [ 
    {date: "2000", selected: "C2000"}, 
    {date: "2001", selected: "C2001"}, 
    {date: "2002", selected: "C2002"}, 
    {date: "2003", selected: "C2003"}, 
    {date: "2004", selected: "C2004"}, 
    {date: "2005", selected: "C2005"}, 
    {date: "2006", selected: "C2006"}, 
    {date: "2007", selected: "C2007"}, 
    {date: "2008", selected: "C2008"}, 
    {date: "2009", selected: "C2009"}, 
    {date: "2010", selected: "C2010"} 
]; 

然後在循環中，通過訪問數據d屬性選擇像今年這樣分配rateById值：

rateById[+d.ID] = +d[options[0].selected];

PS：我不得不在你的jsfiddle刪除代碼的一部分，在您的jsfiddle版本中找不到質心json，從而導致與此問題無關的錯誤。