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Responsive line chart with tooltips

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">

.g-hed {
  	text-align: left;
  	text-transform: uppercase;
  	font-weight: bold;
  	font-size:22px; 
  	margin: 3px 0;
  }

.g-source-bold {
    text-align: left;
    font-size:10px;
    font-weight: bold; 
  }

.g-source {
    margin: 10px 0;
  }

.g-source-bold {
    text-align: left;
    font-size:10px; 
  }

.g-intro {
    font-size: 16px;
    margin: 0px 0px 10px 0px;
  }

.g-labels {
    font-family: 'Proxima-Nova', sans-serif;
    fill: white;
    font-weight: bold;
    font-size: 14px;
  }

.axis line {
    fill: none;
    stroke: #ccc;
    stroke-dasharray: 2px 3px;
    shape-rendering: crispEdges;
    stroke-width: 1px;
  }

.axis text {
    font-family: 'Proxima-Nova', sans-serif;
    font-size: 13px;
    pointer-events: none;
    fill: #7e7e7e;
  }

.y.axis text {
    text-anchor: end !important;
    font-size:14px;
    fill: #7e7e7e;
  }

.domain {
    display: none;
  }

.line {
    stroke: #2f5491;
    stroke-width: 3px;
    fill: none;
  }

.overlay {
    fill: none;
    pointer-events: all;
  }

.focus {
    font-size: 14px;
  }

.focus circle {
    fill: #5e8dc9;
  }

</style>

var widther = window.outerWidth;

var width = widther - margin.left - margin.right,
    height = 400 - margin.top - margin.bottom;

//Parses date for correct time format
var parseDate = d3.time.format("%Y-%m").parse;

//Divides date for tooltip placement
var bisectDate = d3.bisector(function(d) { return d.date; }).left;

//Appends the svg to the chart-container div
var svg = d3.select(".g-chart").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 + ")");

//Creates the xScale 
var xScale = d3.time.scale()
  .range([0, width]);

//Creates the yScale
var yScale = d3.scale.linear()
  .range([height, 0]);

//Defines the y axis styles
var yAxis = d3.svg.axis()
	.scale(yScale)
  .tickSize(-width)
  .tickPadding(8)
	.orient("left");

//Defines the y axis styles
var xAxis = d3.svg.axis()
	.scale(xScale)
  .tickPadding(8)
	.orient("bottom")
	.tickSize(height)
  .ticks(numTicks(width))
  .tickFormat(d3.time.format("%m/%Y"));

//line function convention (feeds an array)
var line = d3.svg.line()
  .x(function(d) { return xScale(d.date); })
  .y(function(d) { return yScale(d.num); });

//Loads the data
d3.csv("linetemplate.csv", ready);

function ready(err, data) {

if (err) throw "error loading data";
  console.log("hello");

//FORMAT data
	data.forEach(function(d) {
		d.num = +d.num;
    d.date = parseDate(d.date);
	});

console.log(data);

//Appends chart headline
	d3.select(".g-hed").text("Chart headline goes here");

//Appends chart intro text
  d3.select(".g-intro").text("Chart intro text goes here. Write a short sentence describing the chart here.");

data.sort(function(a,b) { return a.date - b.date; });

//Defines the xScale max
  xScale.domain(d3.extent(data, function(d) { return d.date; }));

//Defines the yScale max
  yScale.domain(d3.extent(data, function(d) { return d.num; }));

//Appends the y axis
	var yAxisGroup = svg.append("g")
		.attr("class", "y axis")
		.call(yAxis);

//Appends the x axis		
	var xAxisGroup = svg.append("g")
		.attr("class", "x axis")
		.call(xAxis);

//Binds the data to the line
  var drawline = svg.append("path")
    .datum(data)
    .attr("class", "line")
    .attr("d", line);

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

//Adds circle to focus point on line
  focus.append("circle")
      .attr("r", 4);

//Adds text to focus point on line    
  focus.append("text")
      .attr("x", 9)
      .attr("dy", ".35em");    
  
  //Creates larger area for tooltip   
  var overlay = svg.append("rect")
      .attr("class", "overlay")
      .attr("width", width)
      .attr("height", height)
      .on("mouseover", function() { focus.style("display", null); })
      .on("mouseout", function() { focus.style("display", "none"); })
      .on("mousemove", mousemove);
  
  //Tooltip mouseovers            
  function mousemove() {
    var x0 = xScale.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(" + xScale(d.date) + "," + yScale(d.num) + ")");
    focus.select("text").text(d.num);
  };

//Appends chart source
	d3.select(".g-source-bold")
    .text("SOURCE: ")
    .attr("class", "g-source-bold");

d3.select(".g-source-reg")
    .text("Chart source info goes here")
    .attr("class", "g-source-reg");

//RESPONSIVENESS
  d3.select(window).on("resize", resized);

function resized() {

//new margin
    var newMargin = {top: 10, right: 80, bottom: 20, left: 50};

//Get the width of the window
    var w = d3.select(".g-chart").node().clientWidth;
    console.log("resized", w);

//Change the width of the svg
    d3.select("svg")
      .attr("width", w);

//Change the xScale
    xScale
      .range([0, w - newMargin.right]);

//Update the line
    line = d3.svg.line()
      .x(function(d) { return xScale(d.date); })
      .y(function(d) { return yScale(d.num); });

d3.selectAll('.line')
      .attr("d", line);

//Updates xAxis
    xAxisGroup
      .call(xAxis);

//Updates ticks
    xAxis
      .scale(xScale)
      .ticks(numTicks(w));

//Updates yAxis  
    yAxis
      .tickSize(-w - newMargin.right)
  };

}

//Determines number of ticks base on width
function numTicks(widther) {
  if (widther <= 900) {
    return 4
    console.log("return 4")
  }
  else {
    return 12
    console.log("return 5")
  }
}

</script>

Modified http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js to a secure url

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js

https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js