D3 Examples - BarChart with ToolTip

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<!DOCTYPE html>
<meta charset="utf-8">
​
<head>
    <style>
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  .bar{
    fill: steelblue;
  }
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  .bar:hover{
    fill: brown;
  }
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    .axis {
      font: 10px sans-serif;
    }
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    .axis path,
    .axis line {
      fill: none;
      stroke: #000;
      shape-rendering: crispEdges;
    }
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    </style>
</head>
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<body>
    
<script src="https://d3js.org/d3.v3.min.js"></script>
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<script>
// 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]);
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// 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 + ")");
​
       
​
d3.json("stations.json", function(error, data) {
  
   var maxBikes = d3.max(data.values, function(d){     
   var temp=parseInt(d.bike_stands);
​
   
 return  temp   }); 
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    data.values.forEach(function(d) {
        d.availables_bikes = d.availables_bikes;
    });
      var tab=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24];
​
  // scale the range of the data
  x.domain(tab);
  
  y.domain([0, maxBikes]);
  
    // 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", "rotate(-90)" );
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 5)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("bikes");
​
​
  
  
 /****************************************/
  var arr= data.values; 
   //console.log(typeof(arr)); 
  
  //arr.forEach(function(element) //{ 
  element=arr[0];
        var signe=getRandomInt(10)>5?1:-1;
     var correction=signe*getRandomInt((parseInt(element.bike_stands)-parseInt(element.available_bike_stands)/2));
              
              var estimation=parseInt(element.available_bike_stands)+correction;
  element.previsions=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24] ;
  // })
  for(var i=1;i<25;i++){
    
     svg.selectAll("bar")   .data([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24])
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x",i*22-10)
      .attr("width", x.rangeBand()-10)
      .attr("y",i*6)
      .attr("height",200-6*i); 
  
    
  }
 
  
     function getRandomInt(max) {
      return Math.floor(Math.random() * Math.floor(max));
    }
 /****************************************/
​
// Add bar chart
  /*svg.selectAll("bar")
      .data(data.values)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.previsions); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.bike_stands); })
      .attr("height", function(d) { return height - y(d.bike_stands); }); */
  
});
​
</script>
​
</body>
    