Test-Graph-1-line

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */

body { font: 12px Arial;}

path { 
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}

.axis path,
.axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

</style>
<body>

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

// Set the dimensions of the canvas / graph
var margin = {top: 30, right: 20, bottom: 30, left: 50},
    width = 600 - margin.left - margin.right,
    height = 270 - margin.top - margin.bottom;

// Parse the date / time
var parseDate = d3.time.format("%d-%b-%y").parse
		bisectDate = d3.bisector(function(d) { return d.date; }).left,
    formatDate = d3.time.format("%d-%b"),
    formatValue = d3.format(",.2f"),
    formatCurrency = function(d) { return "" + formatValue(d); };
//var parseDate = d3.time.format("%H:%M").parse;

// Set the ranges
var x = d3.time.scale()
.domain([new Date(2014, 0, 1), new Date(2015, 11, 31)])
.range([0, width]);
var y = d3.scale.linear().range([height, 0]);

var color = d3.scale.category10();

// Define the axes
var xAxis = d3.svg.axis().scale(x)
    .orient("bottom")
	.ticks(5)
	.ticks(d3.time.months)
    //.tickSize(16, 0)
    .tickFormat(d3.time.format("%b"));

var yAxis = d3.svg.axis().scale(y)
    .orient("left").ticks(5);

// Define the line
var valueline = d3.svg.line()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.close); });

//how to approcach null value
var line = d3.svg.line()
	line.defined(function(d) { return d.y!=null; });
    
// Adds the svg canvas
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 + ")");

// Get the data
d3.csv("test.csv", function(error, data) {
    data.forEach(function(d) {
        d.date = parseDate(d.date);
        d.close = +d.close;
    });

// Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.date; }));
    y.domain([0, d3.max(data, function(d) { return d.close; })]);
	
	
	// Nest the entries by symbol
    /*var dataNest = d3.nest()
        .key(function(d) {return d.symbol;})
        .entries(data);

var color = d3.scale.category10();  // set the colour scale

// Loop through each symbol / key
    dataNest.forEach(function(d) {

svg.append("path")
            .attr("class", "line")
            .style("stroke", function() { // Add dynamically
                return d.color = color(d.key); })
            .attr("d", valueline(d.values));

});*/

// Add the valueline path.
    svg.append("path")
        .attr("class", "line")
        .attr("d", valueline(data));

// Add the X Axis
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis)
		.append("text")
      .attr("fill", "#000")
      .attr("transform", "rotate(-90)")
      .attr("y", 200)
      .attr("dy", "0.71em");
      
	  svg.append("text")
        .attr("transform", "translate(" + (width / 2) + " ," + (height + margin.bottom) + ")")
        .style("text-anchor", "middle")
        .text("Date");

// Add the Y Axis
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis)
		.append("text")
      .attr("fill", "#000")
      .attr("transform", "rotate(-360)")
	  .attr("transform", "translate(" + width + ",0)")

.attr("y", 6)
      .attr("dy", "0.120em");
	  // Add the text label for the Y axis
    svg.append("text")
        .attr("transform", "rotate(-90)")
        .attr("y", 0 - margin.left)
        .attr("x",0 - (height / 2))
        .attr("dy", "1em")
        .style("text-anchor", "middle")
        .text("");
  
  
    var focus = svg.append("g")
      .attr("class", "focus")
      .style("display", "none");

focus.append("circle")
      .attr("r", 4.5);

focus.append("text")
      .attr("x", 9)
      .attr("dy", ".35em");
   // append the x line
    focus.append("line")
        .attr("class", "x")
        .style("stroke", "blue")
        .style("stroke-dasharray", "3,3")
        .style("opacity", 0.5)
        .attr("y1", 0)
        .attr("y2", height);

// append the y line
    focus.append("line")
        .attr("class", "y")
        .style("stroke", "blue")
        .style("stroke-dasharray", "3,3")
        .style("opacity", 0.5)
        .attr("x1", width)
        .attr("x2", width);

// append the circle at the intersection
    focus.append("circle")
        .attr("class", "y")
        .style("fill", "none")
        .style("stroke", "blue")
        .attr("r", 4);

// place the value at the intersection
    focus.append("text")
        .attr("class", "y1")
        .style("stroke", "white")
        .style("stroke-width", "3.5px")
        .style("opacity", 0.8)
        .attr("dx", 8)
        .attr("dy", "-.3em");
    focus.append("text")
        .attr("class", "y2")
        .attr("dx", 8)
        .attr("dy", "-.3em");

// place the date at the intersection
    focus.append("text")
        .attr("class", "y3")
        .style("stroke", "white")
        .style("stroke-width", "3.5px")
        .style("opacity", 0.8)
        .attr("dx", 8)
        .attr("dy", "1em");
    focus.append("text")
        .attr("class", "y4")
        .attr("dx", 8)
        .attr("dy", "1em");

svg.append("rect")
      .attr("class", "overlay")
      .attr("width", width)
      .attr("height", height)
  		.style("fill", "none")                             // **********
      .style("pointer-events", "all")   
      .on("mouseover", function() { focus.style("display", null); })
      .on("mouseout", function() { focus.style("display", "none"); })
      .on("mousemove", mousemove);
  
  focus.select("circle.y")
      .attr("transform",
            "translate(" + x(d.date) + "," +
                           y(d.close) + ")");

focus.select("text.y1")
      .attr("transform",
            "translate(" + x(d.date) + "," +
                           y(d.close) + ")")
      .text(d.close);

focus.select("text.y2")
      .attr("transform",
            "translate(" + x(d.date) + "," +
                           y(d.close) + ")")
      .text(d.close);

focus.select("text.y3")
      .attr("transform",
            "translate(" + x(d.date) + "," +
                           y(d.close) + ")")
      .text(formatDate(d.date));

focus.select("text.y4")
      .attr("transform",
            "translate(" + x(d.date) + "," +
                           y(d.close) + ")")
      .text(formatDate(d.date));

focus.select(".x")
      .attr("transform",
            "translate(" + x(d.date) + "," +
                           y(d.close) + ")")
                 .attr("y2", height - y(d.close));

focus.select(".y")
      .attr("transform",
            "translate(" + width * -1 + "," +
                           y(d.close) + ")")
                 .attr("x2", width + width);

function mousemove() {
    var x0 = x.invert(d3.mouse(this)[0]),
        i = bisectDate(data, x0, 1),
        d0 = data[i - 1],
        d1 = data[i],
        d = x0 - d0.date > d1.date - x0 ? d1 : d0;
    focus.attr("transform", "translate(" + x(d.date) + "," + y(d.close) + ")");
    focus.select("text").text(formatCurrency(d.close));
  }
      
});

</script>
</body>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js