title: Convert a d3 chart to load data from json inside a variable
body: <p>I'm trying to make a bar chart with d3, and for this I'm following this tutorial <a href="http://www.d3noob.org/2014/02/making-bar-chart-in-d3js.html" rel="nofollow noreferrer">d3noob chart</a>, everything looks good but I'm unable to load the data from a JSON inside a variable instead of load from a JSON file, i've managed to load the json to a var but I have no idea of how to iterate the data and create the bars. The code:</p>
  
  <pre><code>    &lt;!DOCTYPE html&gt;
  &lt;meta charset="utf-8"&gt;
  
  &lt;head&gt;
      &lt;style&gt;
  
          .axis {
              font: 10px sans-serif;
          }
  
          .axis path,
          .axis line {
              fill: none;
              stroke: #000;
              shape-rendering: crispEdges;
          }
  
      &lt;/style&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
  
      &lt;script src="http://d3js.org/d3.v3.min.js"&gt;&lt;/script&gt;
  
      &lt;script&gt;
  
  
  
          var jdata =  [
          {
              "date": "2013-01",
              "value": "53"
          },
          {
              "date": "2013-02",
              "value": "165"
          },
          {
              "date": "2013-03",
              "value": "269"
          },
          {
              "date": "2013-04",
              "value": "344"
          },
          {
              "date": "2013-05",
              "value": "376"
          },
          {
              "date": "2013-06",
              "value": "410"
          },
          {
              "date": "2013-07",
              "value": "421"
          },
          {
              "date": "2013-08",
              "value": "405"
          },
          {
              "date": "2013-09",
              "value": "376"
          },
          {
              "date": "2013-10",
              "value": "359"
          },
          {
              "date": "2013-11",
              "value": "392"
          },
          {
              "date": "2013-12",
              "value": "433"
          },
          {
              "date": "2014-01",
              "value": "455"
          },
          {
              "date": "2014-02",
              "value": "478"
          }
          ];
  
          // console.log(jdata);
          root = JSON.parse( jdata );
  
          var margin = {top: 20, right: 20, bottom: 70, left: 40},
          width = 600 - margin.left - margin.right,
          height = 300 - margin.top - margin.bottom;
  
  // Parse the date / time
  var parseDate = d3.time.format("%Y-%m").parse;
  
  var x = d3.scale.ordinal().rangeRoundBands([0, width], .05);
  
  var y = d3.scale.linear().range([height, 0]);
  
  var xAxis = d3.svg.axis()
  .scale(x)
  .orient("bottom")
  .tickFormat(d3.time.format("%Y-%m"));
  
  var yAxis = d3.svg.axis()
  .scale(y)
  .orient("left")
  .ticks(10);
  
  var svg = d3.select("body").append("svg")
  .data(root)
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform","translate(" + margin.left + "," + margin.top + ")");
  
  //d3.json
  
  //d3.csv("bar-data.csv", function(error, data) {
  //d3.selectAll('g').data(function(data){
  
  
      data.forEach(function(d) {
          d.date = parseDate(d.date);
          d.value = +d.value;
      });
  
      x.domain(data.map(function(d) { return d.date; }));
      y.domain([0, d3.max(data, function(d) { return d.value; })]);
  
      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", "rotate(-90)" );
  
      svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
      .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Value ($)");
  
      svg.selectAll("bar")
      .data(data)
      .enter().append("rect")
      .style("fill", "steelblue")
      .attr("x", function(d) { return x(d.date); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); });
  
  });
  
  
  &lt;/script&gt;
  
  &lt;/body&gt;
  </code></pre>
  
  <p>It's here too: <a href="https://jsfiddle.net/bigua/gwtytyks/" rel="nofollow noreferrer">jsfiddle</a>.</p>