D3 Examples - 15 - Show / hide elements on mouse click with d3.js

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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;
}
​
  .legend{
    font-size: 16px;
    font-weight: bold;
    text-anchor: start;
  }
  
  
</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: 40, bottom: 70, 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;
​
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y0 = d3.scale.linear().range([height, 0]);
var y1 = d3.scale.linear().range([height, 0]);
​
// Define the axes
var xAxis = d3.svg.axis().scale(x)
    .orient("bottom").ticks(5);
​
var yAxisLeft = d3.svg.axis().scale(y0)
    .orient("left").ticks(5);
​
var yAxisRight = d3.svg.axis().scale(y1)
        .orient("right").ticks(5);
​
// Define the line
var valueline = d3.svg.line()
        .x(function(d) { return x(d.date); })
        .y(function(d) { return y0(d.close); });
​
var valueline2 = d3.svg.line()
        .x(function(d) { return x(d.date); })
        .y(function(d) { return y1(d.open); });
    
  // 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 data = [
    {"date":"9-Apr-12","close":436,"open":9.04},
    {"date":"7-Apr-12","close":221,"open":4.02},
    {"date":"5-Apr-12","close":113,"open":9.02},
    {"date":"4-Apr-12","close":64,"open":32.05},
    {"date":"3-Apr-12","close":29,"open":46.03},
    {"date":"2-Apr-12","close":18,"open":51.03}
  ];
  
    // Get the data
    data.forEach(function(d) {
      d.date = parseDate(d.date);
      d.close = +d.close;
      d.open = +d.open;
    });
​
    // Scale the range of the data;
    x.domain(d3.extent(data, function(d) { return d.date; }));
    y0.domain([0, d3.max(data, function(d) { return Math.max(d.close); })]);
    y1.domain([0, d3.max(data, function(d) { return Math.max(d.open); })]);
​
​
    // Add the valueline path.
    svg.append("path")
            .attr("class", "line")
                    .attr("id", "blueLine")
            .attr("d", valueline(data));
​
    svg.append("path")
            .attr("class", "line")
            .attr("id", "redLine")
            .style("stroke", "red")
            .attr("d", valueline2(data));
​
    // Add the X Axis
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
​
    // Add the Y0 Axis Left
    svg.append("g")
            .attr("class", "y axis")
            .attr("fill", "steelblue")
            .call(yAxisLeft);
​
    // Add the Y1 Axis Right
    svg.append("g")
            .attr("class", "y axis")
            .attr("transform", "translate(" + width + " ,0)")
            .attr("fill", "red")
            .call(yAxisRight);
​
    //Add the blue line title
    svg.append("text")
      .attr("x", 0)
      .attr("y", height + margin.top + 10)
      .attr("class", "legend")
      .style("fill", "steelblue")
      .on("click", function () {
        //Determine if current line is visible
        var active = blueLine.active ? false:true,
            newOpacity = active ? 0:1;
        //Hide or show the elements
        d3.select("#blueLine").style("opacity", newOpacity);
        d3.select("#blueAxis").style("opacity", newOpacity);
        //Update whether or not the elements are active
        blueLine.active = active;
    })
    .text("Blue line");
  
  //Add the red line title
    svg.append("text")
      .attr("x", 0)
      .attr("y", height + margin.top + 30)
      .attr("class", "legend")
      .style("fill", "red")
      .on("click", function () {
        //Determine if current line is visible
        var active = redLine.active ? false:true,
            newOpacity = active ? 0:1;
        //Hide or show the elements
        d3.select("#redLine").style("opacity", newOpacity);
        d3.select("#redAxis").style("opacity", newOpacity);
        //Update whether or not the elements are active
        redLine.active = active;
    })
    .text("Red line");
​
    //Text label for the X Axis
    svg.append("text")
            .attr("x", width/2)
            .attr("y", height + + margin.top)
            .style("text-anchor", "middle")
            .text("Date");
​
    //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("Value");
</script>
</body>
    