First-Test-MO-1

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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; // **

// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);

// 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); });
    
// 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 + ")");

var lineSvg = svg.append("g");                             // **********

var focus = svg.append("g")                                // **********
    .style("display", "none");                             // **********

// 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; })]);

// Add the valueline path.
    lineSvg.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);

// Add the Y Axis
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis);

// append the circle at the intersection               // **********
    focus.append("circle")                                 // **********
        .attr("class", "y")                                // **********
        .style("fill", "none")                             // **********
        .style("stroke", "Black")                           // **********
        .attr("r", 4);                                     // **********
    
    // append the rectangle to capture mouse               // **********
    svg.append("rect")                                     // **********
        .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);                       // **********

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.select("circle.y")                           // **********
            .attr("transform",                             // **********
                  "translate(" + x(d.date) + "," +         // **********
                                 y(d.close) + ")");        // **********
    }                                                      // **********

});

</script>
</body>

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

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