D3 Bar chart with JSON data

D3 Bar chart with JSON data

by Khadeer Mohammed

HTML

<script src="https://d3js.org/d3.v3.min.js"></script>

CSS

.bar{
    fill: steelblue;
  }

  .bar:hover{
    fill: brown;
  }

	.axis {
	  font: 10px sans-serif;
	}

	.axis path,
	.axis line {
	  fill: none;
	  stroke: #000;
	  shape-rendering: crispEdges;
	}

JavaScript

var data = [{"Letter":"A","Freq":20},{"Letter":"B","Freq":12},{"Letter":"C","Freq":47},{"Letter":"D","Freq":34},{"Letter":"E","Freq":54},{"Letter":"F","Freq":21},{"Letter":"G","Freq":57},{"Letter":"H","Freq":31},{"Letter":"I","Freq":17},{"Letter":"J","Freq":5},{"Letter":"K","Freq":23},{"Letter":"L","Freq":39},{"Letter":"M","Freq":29},{"Letter":"N","Freq":33},{"Letter":"O","Freq":18},{"Letter":"P","Freq":35},{"Letter":"Q","Freq":11},{"Letter":"R","Freq":45},{"Letter":"S","Freq":43},{"Letter":"T","Freq":28},{"Letter":"U","Freq":26},{"Letter":"V","Freq":30},{"Letter":"X","Freq":5},{"Letter":"Y","Freq":4},{"Letter":"Z","Freq":2}];


// set the dimensions of the canvas
var margin = {top: 20, right: 20, bottom: 70, left: 40},
    width = 600 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;


// set the ranges
var x = d3.scale.ordinal().rangeRoundBands([0, width], .05);

var y = d3.scale.linear().range([height, 0]);

// define the axis
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")


var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(10);


// add the SVG element
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", 
          "translate(" + margin.left + "," + margin.top + ")");


// load the data
//d3.json("data.json", function(error, data) {

    data.forEach(function(d) {
        d.Letter = d.Letter;
        d.Freq = +d.Freq;
    });
	
  // scale the range of the data
  x.domain(data.map(function(d) { return d.Letter; }));
  y.domain([0, d3.max(data, function(d) { return d.Freq; })]);

  // add axis
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .selectAll("text")
      .style("text-anchor", "end")
      .attr("dx", "-.8em")
      .attr("dy", "-.55em")
      .attr("transform",...