D3 Examples - fresh block

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<!DOCTYPE html>
<html>
 <head>
    <title>Bar Transition Example</title>
​
    <style type="text/css">
        #demo { 
            float: left;        
        }
        #vimeo {
            padding: 30px;
            float: left;
        }
    </style>
 </head>
 <body>
​
    <div id="demo">
        <div id="buttons">
        <button id="Data1"> Data 1 </button>
        <button id="Data2"> Data 2 </button>
        <br>
        <button id="random"> Data aléatoire </button>
        <input id="num" value=20> </input>
        </div>
    <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"     id="svg"></svg>
    </div>
​
    <script type="text/javascript">
      var data1 = [
    5,
    20,
    55,
    60,
    89
]
​
var data2 = [
    35,
    80,
    35,
    90,
    19,
    39,
    99
]
​
function random(n)
{
    val = []
    for(i = 0; i < n; i++)
    {
        val.push(Math.random() * 100)
    }
    return val
}
        init();
      var w = 400
var h = 400
​
​
function bars(data)
{
​
    max = d3.max(data)
​
   
    x = d3.scale.linear()
        .domain([0, max])
        .range([0, w])
​
    y = d3.scale.ordinal()
        .domain(d3.range(data.length))
        .rangeBands([0, h], .2)
​
​
    var vis = d3.select("#barchart")
    
    d3-adding-stuff-and-oh-understanding-selections/
    var bars = vis.selectAll("rect.bar")
        .data(data)
​
    
    bars
        .attr("fill", "#0a0")
        .attr("stroke", "#050")
​
    
    bars.enter()
        .append("svg:rect")
        .attr("class", "bar")
        .attr("fill", "#800")
        .attr("stroke", "#800")
​
​
    
    bars.exit()
    .transition()
    .duration(300)
    .ease("exp")
        .attr("width", 0)
        .remove()
​
​
    bars
        .attr("stroke-width", 4)
    .transition()
    .duration(300)
    .ease("quad")
        .attr("width", x)
        .attr("height", y.rangeBand())
        .attr("transform", function(d,i) {
            return "translate(" + [0, y(i)] + ")"
        })
​
}
​
​
function init()
{
​
    //setup the svg
    var svg = d3.select("#svg")
        .attr("width", w+100)
        .attr("height", h+100)
    svg.append("svg:rect")
        .attr("width", "100%")
        .attr("height", "100%")
        .attr("stroke", "#000")
        .attr("fill", "none")
​
    svg.append("svg:g")
        .attr("id", "barchart")
        .attr("transform", "translate(50,50)")
    
    d3.select("#data1")
        .on("click", function(d,i) {
            bars(data1)
        })   
    d3.select("#data2")
        .on("click", function(d,i) {
            bars(data2)
        })   
    d3.select("#random")
        .on("click", function(d,i) {
            num = document.getElementById("num").value
            bars(random(num))
        })   
​
}
data.json
    </script>
  
​
 </body>
</html>
    