Old school D3 from simpler times

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ptvans

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forked from ptvans's block: d3.js nest example

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:20;
      		position:fixed;top:0;right:0;bottom:20;left:0; }

</style>
  
</head>

<body>
  <script>
    var width = 900;
    var height = 650;
    
    var x = d3.scaleBand()
    	.rangeRound([0, width])
    	.padding(0.1)
    	.align(0.1);

var y = d3.scaleLinear()
    	.rangeRound([height, 0]);

var z = d3.scaleOrdinal()
      .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
    
    var transactions = [
  		{amount: 2700.00, vendor: "check", date: "3/01/2016", category: "rent"},
  		{amount: 48.87, vendor: "oreillys autoparts", date: "3/21/2016", category: "auto parts"},
  		{amount: 68.43, vendor: "Van Kleef", date: "4/04/2016", category: "bars"},
      {amount: 22.13, vendor: "pub", date: "4/04/2016", category: "bars"},
      {amount: 18.87, vendor: "oreillys autoparts", date: "5/21/2016", category: "auto parts"},
      {amount: 148.51, vendor: "safeway", date: "6/10/2016", category: "grocery"}
		];
    
    //assign months
    var parseDate = d3.timeParse("%m/%d/%Y");
		var formatMonth = d3.timeFormat("%y-%m");
    
    transactions.forEach(function(d) {
      d.date = +parseDate(d.date);
      var month = formatMonth(d.date);
      d.month = month;
    });
    console.log(transactions);
    
    //group by month and then category	
    var byCategory = d3.nest()
      .key(function(d) { return d.month; })
      .key(function(d) { return d.category; })
    	.rollup(function(leaves) { 
        return d3.sum(leaves, function(d) { return parseFloat(d.amount); })
      }) 
      .entries(transactions);
    
    console.log("by cat",byCategory);
    
    var categoryMap = byCategory.map( function(d){
      console.log("d", d);
      var tempMap = { "month" : d.key }
      d.values.forEach(function(e){
        tempMap[e.key] = e.value;
      })
      return tempMap;
    }); 
    
    // now use StackLayout
    // https://github.com/d3/d3-shape/blob/master/README.md#stack
    
    console.log("map",categoryMap);
    //group by month and then category	
    var byMonth = d3.nest()
      .key(function(d) { return d.month; })
    	.rollup(function(leaves) { 
        return d3.sum(leaves, function(d) { return parseFloat(d.amount); })
      }) 
      .entries(transactions);
    	console.log("by month", byMonth)
    
      //group by month and then category	
    var nestedMonth = d3.nest()
      .key(function(d) { return d.month; })
    	.rollup(function(leaves) { return leaves }) 
      .entries(transactions);
    	console.log("nested month", nestedMonth)
    
      
      
    // DOMAINS
    //x.domain(d3.extent(transactions, function(d) { return d.month; }));
    x.domain(d3.set(transactions, function(d){return d.month}).values());
    console.log(x.domain());
  //x domain map to month
  
    y.domain([0, d3.max(byMonth, function(d) { return d.value; })]).nice();
  //y domain needs to map to amount by month
  
    z.domain(function(d) { return d.category; });
	//z domain needs to map to categories
        
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height);
    
    g = svg.append("g");
    
    g.selectAll(".categories")
    	.data(byCategory)
    	.enter().append("rect")
      	.attr("class", "categories")
      	.attr("fill", function(d) { return z(d.key); })
    		.attr("x", 6)
    		.attr("y", 20)
    		.attr("height", 20)
    		.attr("width", 40)
    	
    g.selectAll(".transactions")
    	.data(transactions)
      .enter().append("rect")
    		.attr("class", "transactions")
    		.attr("fill", function(d) { return z(d.category); })
        .attr("x", function(d) { return x(d.month); })
        .attr("y", 10)
        .attr("height", function(d) { return y(d.amount); })
        .attr("width", x.bandwidth())
    		.text(function(d) {return d.category})
    
    g.selectAll(".labels")
    	.data(transactions)
      .enter().append("text")
    		.attr("class", "labels")
    		.attr("fill", "black")
        .attr("x", function(d) { return x(d.month); })
        .attr("y", 50)
    		.text(function(d) {return d.category})

</script>
</body>

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