D3 Examples - simple line chart from dataset

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .line {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
    var width = 800;
    var height = 400;
​
    // https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    var parseDate = d3.time.format("%Y-%m");
    var displayDate = d3.time.format("%b %y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scale.ordinal()
        .rangeRoundBands([0, width], .5);
​
    var y = d3.scale.linear()
        .range([height, height - 200]);
​
    var line = d3.svg.line()
        .x(function(d) { return x(d.name); })
        .y(function(d) { return y(d.value); })
    
    var y1 = [{name:"A", value: 10, y2: 420},{name: "B", value:30, y2: 420},
              {name: "C", value: 20, y2: 420},{name: "D", value: 40, y2: 420},  {name:"E", value: 50, y2: 420},{name: "F", value: 20, y2: 420},{name: "G", value: 10, y2: 420},{name: "H", value: 30, y2: 420},{name: "I", value: 40, y2: 420},{name: "J", value: 60, y2: 420},{name: "K", value: 30, y2: 420},{name: "L", value: 10, y2: 420}];
​
    var g = svg.append("g")
      .attr("transform", "translate(50, 0)")
    
    d3.json("dataset.json", function(data) {
      // Pre-processing
      data.forEach(function(d) {
        d.value;// = +d.value;
        d["date"] = parseDate.parse(d["date"]);
      });
      
      x.domain(data.map(function(d) { return d.name; }));
      y.domain([0, d3.max(data, function(d) { return d.value; })]);
      
      svg.selectAll("text").data(data).enter()
       .append("text")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 420)
        .attr("x", function(d) { return x(d.name); })
        .style("font-size", 10)
        .style("font-family", "monospace");
​
      g.selectAll("line").data(y1).enter().append("line")
      .style("stroke", "black")
         .style("stroke-dasharray", "3, 3")
      .style("opacity", 0)
        .attr("x1",function(d) { return x(d.name); })
        .attr("y1",function(d) { return y(d.value); })
        .attr("x2",function(d) { return x(d.name); })
        .attr("y2",function(d) { return d.y2; })
​
      g.selectAll("path").data([data]).enter().append("path")
        .attr("class", "line")
        .attr("d", line);
      
      g.selectAll("circle").
                  data(data).enter().append("circle")
                        .attr("cy", function (d) { return y(d.value);})
                        .attr("cx", function (d) { return x(d.name);})
                        .attr("r", function (d) { return d.rad; })
                        .style("fill", "darkgray")
                        .on("mouseover",function(d,i) { 
        alert("choosen"+i)
       d3.select("g").select("line:nth-child("+ (i + 1)+")").style("opacity",5)
        d3.select(this).style("fill","red");
        //d3.select(this).append("text").attr("class", "hover").text(data[i].value)
svg.append("text").attr({
               id: "leg-" + i,  // Create an id for text so we can select it later for removing on mouseout
                x: function() { return x(d.name) +50; },
                y: function() { return y(d.value) - 15; }
            })
            .text(function() {
              return data[i].value;  // Value of the text
            });
                    })
                        .on("mouseout",function(d,i){
        d3.select("g").select("line:nth-child("+ (i + 1)+")").style("opacity",0)
        d3.select(this).style("fill","darkgray")
        d3.select("#leg-" + i).remove();
      })
        
    });
​
  </script>
</body>
    