s.matthew.english s.matthew.english - 18 days ago 12
Javascript Question

relocate d3 map to center of screen no matter the device

I've got the following d3 map:

enter image description here

but as you can see it's all bunched up there in the left corner of the screen- this is sub opimal- ideally I would like it to be centered.

How can I achieve this?

I guess it should be easy but every time I google something like "center align d3 map" I get things about zooming


maybe I need to create a div or something?

the code is here on my GitHub

also below- it's pretty well commented.

<!DOCTYPE html>
<html lang='en'>
<meta charset='utf-8'>

.border {
stroke: #000;
fill: none;

.graticule {
fill: none;
stroke: #777;
stroke-width: .5px;
stroke-opacity: .5;

div.tooltip {
position: absolute;
text-align: center;
width: 84px;
height: 64px;
padding: 2px;
font: 12px sans-serif;
background: lightgrey;
border: 0px;
border-radius: 8px;
pointer-events: none;



<h1>Administrative Sub-Regions of Europe</h1>

<!-- this is the form at the bottom to change the NUTS -->
<select id="json_sources" name="json_sources" >
<option value ="nuts0" selected >Source 0</option>
<option value ="nuts1" >Source 1</option>
<option value ="nuts2" >Source 2</option>
<option value ="nuts3" >Source 3</option>

<!-- spinner -->
<script src='https://cdnjs.cloudflare.com/ajax/libs/spin.js/2.0.1/spin.min.js'></script>
<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/colorbrewer.v1.min.js"></script>
<script src="https://cdn.rawgit.com/rveciana/d3-composite-projections/v0.2.0/composite-projections.min.js"></script>

<!-- why do we need this? -->
<section id='chart'>


var div = d3.select("body").append("div")
.attr("class", "tooltip")
.style("opacity", 0);

var width = 600,
height = 500;

var projection = d3.geo.conicConformalEurope();
var graticule = d3.geo.graticule();

var path = d3.geo.path()

// Find new colours here: http://colorbrewer2.org/
var scale = d3.scale

var svg = d3.select("body")
.attr("width", width, "100%")
.attr("height", height, "100%")
on("zoom", function () {
svg.attr("transform", "translate(" +

d3.event.translate +

")" + " scale(" +

d3.event.scale +
.on("dblclick.zoom", null)

//what the hell does this do?
.attr("class", "graticule")
.attr("d", path);

// pretty self spoken
var dropdown = d3.select("#json_sources")

// config references SPINNER RELATED
var chartConfig = {
target : 'chart',
data_url : './nuts0.json',
width: 600,
height: 500,
val: 90

// loader settings SPINNER RELATED
var opts = {
lines: 9, // The number of lines to draw
length: 9, // The length of each line
width: 5, // The line thickness
radius: 14, // The radius of the inner circle
color: '#EE3124', // #rgb or #rrggbb or array of colors
speed: 1.9, // Rounds per second
trail: 40, // Afterglow percentage
className: 'spinner', // The CSS class to assign to the spinner

var target = document.getElementById(chartConfig.target);

// KICK OFF callback function wrapped for loader in 'init' function
function init() {

// trigger loader initial spinner
var spinner = new Spinner(opts).spin(target);

// load json data and trigger callback
d3.json(chartConfig.data_url, function(data) {

// stop spin.js loader

// instantiate chart within callback


//call that init function we define above

//here where all the real stuff happens
//in fact all that init stuff is just legacy
//from the spinner example
function chart(data) {

//start of map making function
var change = function() {

// trigger loader of the spinner
var spinner = new Spinner(opts).spin(target);

// did they change the NUTS?
var source = dropdown.node().options[dropdown.node().selectedIndex].value;

//necessary data processing
var str1 = source;
var str2 = ".json";
var file = str1.concat(str2);

d3.json(file, function(error, europe) {

d3.csv("povertry_rate.csv", function(error, povrate) {

//change the map to apadpt to the nuts file
if (source == "nuts1") {
var land = topojson.feature(europe, europe.objects.nuts1);
} else if (source == "nuts2") {
var land = topojson.feature(europe, europe.objects.nuts2);
} else if (source == "nuts3") {
var land = topojson.feature(europe, europe.objects.nuts3);
} else if (source == "nuts0") {
var land = topojson.feature(europe, europe.objects.nuts0);

data = {};
povrate.forEach(function(d) {
data[d.GEO] = d['2013'];

//clear way for the regeneration
//recreate those map lines
.attr("class", "graticule")
.attr("d", path);

// stop spin.js loader

.attr("d", path)
var value = data[d.id];
if (isNaN(value)){
value = data[d.id.substring(0,2)];
if (isNaN(value)){
return "#fff";

return scale(value);
.on("mouseover", function(d,i) {
var value = data[d.id];
if (isNaN(value)){
value = data[d.id.substring(0,2)];
.style("opacity", 0.9);
div.html("<b>"+d.properties.name+"</b><br/>" + value + "%")
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
.on("mouseout", function(d,i) {
.style("opacity", 0);

.attr("d", projection.getCompositionBorders());



dropdown.on("change", change)
change(); //call that change function once





Not really a d3 question just a little CSS:

svg {
  display: block;
  margin: auto;
  border: 1px solid gray;