d3intro_exercise_data_w_key_solved

Intro d3js

### Example21 - join by key

forked from jjelosua's block: d3intro_ex21

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Intro d3js examples</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <style>
      body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
      p:hover {
        cursor: pointer;
      }
    </style>
  </head>
  <body>
    <h1>Intro d3js - exercise binding with key</h1>
    <p id="update">Click here to update data</p>
    
    <script type="text/javascript">
    	//Width and height
      var active2015 = true;
      var w = 600;
      var h = 250;
      var offset = 10;
      
      var data2015 = [ { product: "camisas", value: 5 },
              				  { product: "pantalones", value: 10 }];

var yScale = d3.scale.linear()
              .domain([0, d3.max(data, function(d) { return d.value; })])
              .range([h, 0]);
      
      //Define key function, to be used when binding data
      var key_func = function(d) {
        return d.product;
      };

//Create SVG element
      var svg = d3.select("body")
            .append("svg")
            .attr("width", w)
            .attr("height", h);

//Create bars
      svg.selectAll("rect")
         .data(data2015, key_func)
         .enter()
         .append("rect")
         .attr("x", function(d, i) {
             return xScale(i);
         })
         .attr("y", function(d) {
             return yScale(d.value);
         })
         .attr("width", xScale.rangeBand())
         .attr("height", function(d) {
             return h - yScale(d.value);
         })
         .attr("fill", function(d) {
          return "rgb(0, 0, " + (d.value * 10) + ")";
         });

//Create labels
      svg.selectAll("text")
         .data(data, key_func)
         .enter()
         .append("text")
         .text(function(d) {
             return d.product + ": " + d.value;
         })
         .attr("text-anchor", "middle")
         .attr("x", function(d, i) {
             return xScale(i) + xScale.rangeBand() / 2;
         })
         .attr("y", function(d) {
             return yScale(d.value) + offset;
         })
         .attr("font-family", "sans-serif")
         .attr("font-size", "11px")
         .attr("fill", "white");

//On click, update with new data      
      d3.selectAll("p#update")
        .on("click", function() {
        	// Toggle dataset
        	active2015 = !active2015;
        	var data = active2015 ? data2015 : data2016;
          //Update scale domains
          xScale.domain(d3.range(data.length));
          yScale.domain([0, d3.max(data, function(d) { return d.value; })]);

//Select…
          var bars = svg.selectAll("rect")
            .data(data, key_func);
          
          //Enter…
          bars.enter()
            .append("rect")
            .attr("x", w)
            .attr("y", function(d) {
              return yScale(d.value);
            })
            .attr("width", xScale.rangeBand())
            .attr("height", function(d) {
              return h - yScale(d.value);
            })
            .attr("fill", function(d) {
              return "rgb(0, 0, " + (d.value * 10) + ")";
            });

//Update…
          bars.transition()
            .duration(500)
            .attr("x", function(d, i) {
              return xScale(i);
            })
            .attr("y", function(d) {
              return yScale(d.value);
            })
            .attr("width", xScale.rangeBand())
            .attr("height", function(d) {
              return h - yScale(d.value);
            });

//Exit…
          bars.exit()
            .transition()
            .duration(500)
            .style("opacity", 0)
            .remove();

//Update all labels
  
          //Select…
          var labels = svg.selectAll("text")
            .data(data, key_func);
          
          //Enter…
          labels.enter()
            .append("text")
            .text(function(d) {
              return d.product + ": " + d.value;
            })
            .attr("text-anchor", "middle")
            .attr("x", w)
            .attr("y", function(d) {
              return yScale(d.value) + offset;
            })            
             .attr("font-family", "sans-serif")
             .attr("font-size", "11px")
             .attr("fill", "white");

//Update…
          labels.transition()
            .duration(500)
            .attr("x", function(d, i) {
              return xScale(i) + xScale.rangeBand() / 2;
            })
          	.attr("y", function(d) {
              return yScale(d.value) + offset;
            })
            .text(function(d) {
              return d.product + ": " + d.value;
            });

//Exit…
          labels.exit()
            .transition()
            .duration(500)
          	.style("opacity", 0)
            .remove();
        });
      </script>
  </body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js