Nested test

forked from anonymous's block: fresh block

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>US Map of Nielsen Media Markets</title>
  
</head>
<body>

<button data-month="Jan">
  January
</button>
<button data-month="Feb">
  February
</button>
<div id="toggle">
	<p>Initialized with "Jan", use buttons to toggle</p>
</div>
  
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
//define some data
var data = [
		{"location": 1, "month": "Jan", "year": 2017, "value": "#ccc"},
		{"location": 2, "month": "Jan", "year": 2017, "value": "#999"},
		{"location": 3, "month": "Jan", "year": 2017, "value": "#666"},
		{"location": 4, "month": "Jan", "year": 2017, "value": "#333"},
		{"location": 1, "month": "Jan", "year": 2018, "value": "#fcc"},
		{"location": 2, "month": "Jan", "year": 2018, "value": "#f99"},
		{"location": 3, "month": "Jan", "year": 2018, "value": "#f66"},
    {"location": 4, "month": "Jan", "year": 2018, "value": "#f33"},
		{"location": 1, "month": "Feb", "year": 2017, "value": "#cfc"},
		{"location": 2, "month": "Feb", "year": 2017, "value": "#9f9"},
		{"location": 3, "month": "Feb", "year": 2017, "value": "#6f6"},
		{"location": 4, "month": "Feb", "year": 2017, "value": "#3f3"},
		{"location": 1, "month": "Feb", "year": 2018, "value": "#ccf"},
		{"location": 2, "month": "Feb", "year": 2018, "value": "#99f"},
		{"location": 3, "month": "Feb", "year": 2018, "value": "#66f"},
		{"location": 4, "month": "Feb", "year": 2018, "value": "#33f"},
	]
 
 // nest the data by month then year
 var by_month = d3.nest()
		.key(function(d){return d.month})
		.key(function(d){return d.year})
		.entries(data)
    
    
function render(ident, key_month) {

var w = 300
	var h = 100

var container = d3.select(ident)
	
  // select and add a container div for each year in the data
  // using only the data for the target month
	var year = container
		.selectAll("div.year")
	
  var data = by_month.filter(function(d){return d.key == key_month})[0].values;
	var yearAll= year.data(data);
  
   
  yearAll.exit().remove();
  
  
  var yearEnter= yearAll
		.enter()
    .append("div")
    .classed("year",true);

yearEnter = yearEnter.merge(yearAll);
  
  // add a h2
  var h2 = yearEnter.selectAll("h2")
  									.data(function(d) {return [d];});
  
  var h2Enter = h2.enter()
              .append("h2");
  				
  h2Enter.merge(h2)
  	.text(function(d) {return  d.values[0].month + " " + d.values[0].year ;});
 
  // select and add a svg
	var svg = yearEnter.selectAll("svg")
  					.data(function(d) {return [d];});
  
	var svgEnter = svg.enter()
  						.append("svg");
    				
  
  svg.exit().remove();
	
  //update the svg dimensions
	svgEnter = svgEnter.merge(svg)
		.attr("width", w)
		.attr("height", h)
	
  // select and add element wrapper g
	var location_wrap = svgEnter.selectAll("g.location")
  										     .data(function(d) {return [d];});
  
  location_wrap.exit().remove();
	var location_wrapEnter = location_wrap.enter()
  																			.append("g")
  																			.classed("location",true);
  
  location_wrapEnter = location_wrapEnter.merge(location_wrap);
		    
  
  var location =location_wrapEnter.selectAll("g")
  					               .data(function(d){return d.values});
  
  location.exit().remove();
  
	var locationEnter = location.enter()
											.append("g");
					
  
  // merge and position element wrappers
	var locationEnter = locationEnter.merge(location)
		.attr("transform", function(d,i){return "translate("+[w/4*i]+")"});

var rects = locationEnter.selectAll("rect")
  									.data(function(d){return [d];});
 
  rects.exit().remove();
  var rectsEnter = rects.enter()
  								.append("rect")
  								.attr("x", 5)
									.attr("width", w/4 - 5)
									.attr("height", w/4 - 5);
  
  rectsEnter.merge(rects).attr("fill", function(d){return d.value});

}

// on button click change the subset of data being used
d3.selectAll("button").on("click", function(){
    render("#toggle",this.getAttribute("data-month"))
})

render("#toggle","Jan")
  
</script>

https://d3js.org/d3.v4.min.js