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HTML

              
                <div id="app"></div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Josefin+Sans');

body {
   margin: 0 auto;
   font-family: 'Josefin Sans',sans-serif;
   h1 {
      font-size: 30px;
      margin-top: 25px;
   }
   h2 {
      font-size: 22px;
   }
   h3 {
      font-size: 15px;
   }
   #graphcontainer {
      margin: 0 auto;
   }
}
              
            
!

JS

              
                // jshint esversion:6
/*

User Story: I can view a heat map with data represented both on the Y and X axis.

User Story: Each cell is colored based its relationship to other data.

User Story: I can mouse over a cell in the heat map to get more exact information.

API sample:

{
  "baseTemperature": 8.66,
  "monthlyVariance": [
    {
      "year": 1753,
      "month": 1,
      "variance": -1.366
    },
    {
      "year": 1753,
      "month": 2,
      "variance": -2.223
    },
    {
      "year": 1753,
      "month": 3,
      "variance": 0.211
    }
 }

*/

const URL = "https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/global-temperature.json";

class App extends React.Component {
   
   constructor() {
    super();
    this.state = {
      data: [],
      baseTemp: "",
      monthsInfo: [],
      colorscheme: ["#923FF5","#7A9ECC","#99C6FF","#FFDF52","#FFDF80","#FFB42D","#CC9024","#996C1B","#A00303"],
      months: ["Jan.","Feb.","Mar","April","May","June","July","Aug.","Sept.","Oct.","Nov.","Dec."]
    };
  }

   
   componentDidMount(){
   d3.json(URL, (data) => {
      //getting all data from api
      //setting states
      this.setState({
        data: data,
        baseTemp: data.baseTemperature,
        monthsInfo: data.monthlyVariance
      });
      
    });
   }
   
   _heatmapGraph(){
      //build the graph with d3!
      let data = this.state.monthsInfo;
      let base = this.state.baseTemp;
      let mon = this.state.months;
      
      const MARGINS = {
         top: 15,
         left: 100,
         right: 30,
         bottom: 100
      }
      
      const WIDTH = 1200 - MARGINS.left - MARGINS.right;
      const HEIGHT = 600 - MARGINS.top - MARGINS.bottom;

      
      let tooltip = d3.select('body').append('div')
         .style('color', 'white')
         .style('position', 'absolute')
         .style('background', 'rgba(0,0,0,0.7)')
         .style('padding', '15 15px')
         .style('border', '2px black solid')
         .style('border-radius', '5px')
         .style('font-size', '15px')
         .style('opacity', '0')
         .data(data);
      
      let yScale = d3.scaleLinear()
                     .domain([0,d3.max(data,function(d){return d.month;})])
                     .range([0, HEIGHT]);

      let xScale = d3.scaleLinear()
                     .domain([d3.min(data,function(d){return d.year;}),d3.max(data,function(d){return d.year;})])
                     .range([0, WIDTH]);
      
      let color = d3.scaleQuantile()
                    .domain([d3.min(data,function(d){return base + d.variance;}),d3.max(data,function(d){return base + d.variance;})])
                    .range(this.state.colorscheme)
                    
      
      let monthConvert = function(d){
         let m = mon;
         for(let j = 0; j<m.length; j++){
         if(d - 1 === j){
            return m[j];
         }
        }
      }
      
      let heatmap = d3.select('#heatmap').append('svg')
                      .attr('width', WIDTH + MARGINS.left + MARGINS.right)
                      .attr('height', HEIGHT + MARGINS.top + MARGINS.bottom)
                      .append('g')
                      .attr('transform', 'translate(' + MARGINS.left + ',-' + (MARGINS.top + 15) + ')')
                      .selectAll('rect')
                      .data(data)
                      .enter()
                        .append('rect')
                        .style('fill',function(d){
                           return color(base + d.variance);
                        })
                        .attr('width','10px')
                        .attr('height', '45px')
                        .attr('x',function(d){return xScale(d.year);})
                        .attr('y',function(d){return yScale(d.month);})
      
                        .on('mouseover', function(d, i) {

         tooltip.transition()
            .style('opacity', 1);

         tooltip.html(function() {
               let month = monthConvert(data[i].month);
               let temperature = base + data[i].variance;
               return month + " " + data[i].year + "<br>" + temperature + "*C" + "<br>" + "Difference: " + data[i].variance;

            })
            .style('left', (d3.event.pageX) + 'px')
            .style('top', (d3.event.pageY) + 'px')
         d3.select(this).style('opacity', '0.8')
            .style('fill', 'blue');
      })

      .on('mouseout', function(d, i) {
         tooltip.transition()
            .style('opacity', 0);

         d3.select(this).style('opacity', '1')
            .style('fill', color(base + d.variance))

      });
                        
     
      let vScale = d3.scaleLinear()
         .domain([0,d3.max(data,function(d){return d.month;})])
         .range([0, HEIGHT]);

      let vAxis = d3.axisLeft()
         .scale(vScale)
         .ticks(12)
         .tickPadding(5)
         .tickFormat(function(d,i){
            return mon[i];
         });

      let vGuide = d3.select('svg')
         .append('g')
      vAxis(vGuide)
      vGuide.attr('id', 'vGuide')
      vGuide.attr('transform', 'translate(' + MARGINS.left + ',' + MARGINS.top + ')')
      vGuide.selectAll('path')
         .style('fill', 'none')
         .style('stroke', 'black')
      vGuide.selectAll('line')
         .style('stroke', 'black');

      let hScale = d3.scaleTime()
         .domain([d3.min(data,function(d){return d.year;}), d3.max(data,function(d){return d.year;})])
         .range([0, WIDTH]);

      let hAxis = d3.axisBottom()
         .scale(hScale)
         .ticks(10)
         .tickFormat(function(d,i){
            return d * 1;
         });
        

      let hGuide = d3.select('svg')
         .append('g')
      hAxis(hGuide)
      hGuide.attr('id', 'hGuide')
      hGuide.attr('transform', 'translate(' + MARGINS.left + ',' + (HEIGHT + MARGINS.top) + ')')
      hGuide.selectAll('path')
         .style('fill', 'none')
         .style('stroke', 'black')
      hGuide.selectAll('line')
         .style('stroke', 'black');

      hGuide.append("text")
         .attr("text-anchor", "middle")
         .attr('x', (WIDTH / 2))
         .attr('y', 40)
         .style('fill','black')
         .text("Years");

      vGuide.append("text")
         .attr("text-anchor", "middle")
         .attr('x', -50)
         .attr("y", -50)
         .attr("transform", "rotate(-90)")
         .style('fill','black')
         .text("Months");

      
      let legendXScale = d3.scaleLinear()
                           .domain([0,this.state.colorscheme.length])
                           .range([0,400]);
      
      let legend = d3.select('svg').append('g')
                     .attr('width',400)
                     .attr('height',25)
                     .attr('transform','translate(800,0)')
                     .append('g')
                     .selectAll('rect')
                     .data(this.state.colorscheme)
                     .enter()
                     .append('rect')
                     .attr('width',(400 / this.state.colorscheme.length))
                     .attr('height',25)
                     .attr('x',function(d,i){return legendXScale(i);})
                     .attr('y',(HEIGHT + 50))
                     .style('fill',function(d){
                        return d;
                     });
      
      let textData = ["0-1.5","1.5-3","3-5","5-6.5","6.5-8","8-9","9-10","10-12","12-14"];
      let legendText = d3.select('svg').append('g')
                           .attr('transform','translate(335,20)')
                           .selectAll('text')
                           .data(textData)
                           .enter()
                           .append('text')
                           .attr('x',function(d,i){ return HEIGHT + (i * 45)})
                           .attr('y', (HEIGHT + 50))
                           .style('color','black')
                           .attr('text-anchor','middle')
                     .text(function(d,i){
                        return d;
                     });
                     
      
      
   }
   
   
   render(){
      let graph = this._heatmapGraph();
 
      return (
          <div>
            <h1 className="text-center">Free Code Camp</h1>
            <h1 className="text-center">Monthly Global Land Surface Temperature</h1>
            <h2 className="text-center">Years 1753-2015</h2>
            <h3 className="text-center">Temperatures are in Celsius and reported as anomalies relative to the Jan 1951-Dec 1980 average.
            </h3>
            <h3 className="text-center">Estimated Jan 1951-Dec 1980 absolute temperature ℃: 8.66 +/- 0.07</h3>
            <div id="graphcontainer">
            <div id="heatmap">
               {graph}
            </div>
            </div>
            
          </div>
      )
   }
}


ReactDOM.render(<App />,document.getElementById('app'));
              
            
!
999px

Console