D3 Examples - Test-Graph-1-line(one clumn)

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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>
​
<!-- load the d3.js library -->    
<script src="https://d3js.org/d3.v3.min.js"></script>
​
<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;
//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("");
      
});
​
</script>
</body>
    