D3 Examples - Area Chart ( + only,

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
:root .grid-stack-item > .ui-resizable-handle {
  filter: none;
}
​
#info-watchlist th:last-child, #info-watchlist th:first-child {
  margin: 0;
  width: 5px;
}
​
#bar-chart-info{
  color: #4A9AD5;
  font-size: 12px;
  font-family: 'Roboto-Regular';
  padding: 0;
}
​
#line-chart-info{
  font-size: 12px;
  font-family: 'Roboto-Regular';
  padding: 0;
}
​
#delete-new-row,
#delete-row,
#add-new-account-tr,
#drag-tr {
  cursor: pointer;
}
​
#info-watchlist td:first-child {
  padding-left: 2px;
  padding-right: 2px;
}
​
#info-watchlist tr.space > td,
#add-new-account-tr {
  padding-top: 1em !important;
  padding-bottom: 1em !important;
}
​
#toggle-icon {
  list-style:none;
  position: absolute;
  right: 0;
  padding: 0;
  width: 100px;
  font-size: 14px;
  font-style: 'Roboto-Regular';
  background-color: white;
  border: 1px solid;
  display: none;
  z-index: 999;
}
​
#toggle-icon li {
  color: #3ac8f8;
  padding: 5px;
  border-bottom: 1px solid;
}
​
.grid .tick {
    stroke: lightgrey;
    opacity: 0.7;
}
.grid path {
    stroke-width: 0;
}
.area-chart.above {
  fill: lightsteelblue;
  stroke-width: 0;
}
.area-chart.below{
  fill: red;
  stroke-width: 0;
}
.overlay {
    fill: none;
    pointer-events: all;
}
.focus circle {
    fill: none;
    stroke: steelblue;
}
​
// path {
//     stroke: steelblue;
//     stroke-width: 2;
//     fill: none;
// }
​
#toggle-icon li:hover {
  background: #9FD0EC;
  color: white;
  cursor: pointer;
}
​
#save-current-edit {
  position: absolute;
  right: 1em;
  top: 0.6em;
  font-size: 1.4em;
  color: rgb(193, 236, 158);
  cursor: pointer;
}
​
#cancel-current-edit {
  position: absolute;
  right: 2.4em;
  top: 0.6em;
  font-size: 1.4em;
  color: red;
  cursor: pointer;
}
​
#ellipsis-icon{
  position: absolute;
  right: 1em;
  top: 0.9em;
  font-size: 1.2em;
  color: #9FD0EC;
}
​
.no-hover{
  pointer-events: none;
}
​
#ellipsis-icon:hover{
  cursor: pointer;
}
​
.legend-inline {
  display: inline-block;
  width: auto;
}
​
#widget-heading-link:hover{
  color: #9FD0EC;
  cursor: pointer;
}
​
.header-widget {
  padding-left: 1.5em;
  padding-right: 1.5em;
  margin-top: -0.6em;
}
​
.line-path {
  fill: none;
  stroke: #818384;
  stroke-width: 1px;
}
​
li.filter-dropdown:hover{
  background: #81B6E5;
  color: #fff;
}
​
li.filter-dropdown.selected{
  background: #81B6E5;
  color: #fff;
}
​
.axis {
  font: 10px sans-serif;
}
​
.tick line{
  opacity: 0.8;
  stroke-dasharray: 5 5;
}
​
.must-show{
    display: inline;
}
​
</style>
<script src="https://d3js.org/d3.v4.min.js"></script>
<body>
<script>
  
// d3.tip
// Copyright (c) 2013 Justin Palmer
// ES6 / D3 v4 Adaption Copyright (c) 2016 Constantin Gavrilete
// Removal of ES6 for D3 v4 Adaption Copyright (c) 2016 David Gotz
//
// Tooltips for d3.js SVG visualizations
​
d3.functor = function functor(v) {
  return typeof v === "function" ? v : function() {
    return v;
  };
};
​
d3.tip = function() {
​
  var direction = d3_tip_direction,
      offset    = d3_tip_offset,
      html      = d3_tip_html,
      node      = initNode(),
      svg       = null,
      point     = null,
      target    = null
​
  function tip(vis) {
    svg = getSVGNode(vis)
    point = svg.createSVGPoint()
    document.body.appendChild(node)
  }
​
  // Public - show the tooltip on the screen
  //
  // Returns a tip
  tip.show = function() {
    var args = Array.prototype.slice.call(arguments)
    if(args[args.length - 1] instanceof SVGElement) target = args.pop()
​
    var content = html.apply(this, args),
        poffset = offset.apply(this, args),
        dir     = direction.apply(this, args),
        nodel   = getNodeEl(),
        i       = directions.length,
        coords,
        scrollTop  = document.documentElement.scrollTop || document.body.scrollTop,
        scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft
​
    nodel.html(content)
      .style('position', 'absolute')
      .style('opacity', 1)
      .style('pointer-events', 'all')
​
    while(i--) nodel.classed(directions[i], false)
    coords = direction_callbacks[dir].apply(this)
    nodel.classed(dir, true)
      .style('top', (coords.top +  poffset[0]) + scrollTop + 'px')
      .style('left', (coords.left + poffset[1]) + scrollLeft + 'px')
​
    return tip
  }
​
  // Public - hide the tooltip
  //
  // Returns a tip
  tip.hide = function() {
    var nodel = getNodeEl()
    nodel
      .style('opacity', 0)
      .style('pointer-events', 'none')
    return tip
  }
​
  // Public: Proxy attr calls to the d3 tip container.  Sets or gets attribute value.
  //
  // n - name of the attribute
  // v - value of the attribute
  //
  // Returns tip or attribute value
  tip.attr = function(n, v) {
    if (arguments.length < 2 && typeof n === 'string') {
      return getNodeEl().attr(n)
    } else {
      var args =  Array.prototype.slice.call(arguments)
      d3.selection.prototype.attr.apply(getNodeEl(), args)
    }
​
    return tip
  }
​
  // Public: Proxy style calls to the d3 tip container.  Sets or gets a style value.
  //
  // n - name of the property
  // v - value of the property
  //
  // Returns tip or style property value
  tip.style = function(n, v) {
    // debugger;
    if (arguments.length < 2 && typeof n === 'string') {
      return getNodeEl().style(n)
    } else {
      var args = Array.prototype.slice.call(arguments);
      if (args.length === 1) {
        var styles = args[0];
        Object.keys(styles).forEach(function(key) {
          return d3.selection.prototype.style.apply(getNodeEl(), [key, styles[key]]);
        });
      }
    }
​
    return tip
  }
​
  // Public: Set or get the direction of the tooltip
  //
  // v - One of n(north), s(south), e(east), or w(west), nw(northwest),
  //     sw(southwest), ne(northeast) or se(southeast)
  //
  // Returns tip or direction
  tip.direction = function(v) {
    if (!arguments.length) return direction
    direction = v == null ? v : d3.functor(v)
​
    return tip
  }
​
  // Public: Sets or gets the offset of the tip
  //
  // v - Array of [x, y] offset
  //
  // Returns offset or
  tip.offset = function(v) {
    if (!arguments.length) return offset
    offset = v == null ? v : d3.functor(v)
​
    return tip
  }
​
  // Public: sets or gets the html value of the tooltip
  //
  // v - String value of the tip
  //
  // Returns html value or tip
  tip.html = function(v) {
    if (!arguments.length) return html
    html = v == null ? v : d3.functor(v)
​
    return tip
  }
​
  // Public: destroys the tooltip and removes it from the DOM
  //
  // Returns a tip
  tip.destroy = function() {
    if(node) {
      getNodeEl().remove();
      node = null;
    }
    return tip;
  }
​
  function d3_tip_direction() { return 'n' }
  function d3_tip_offset() { return [0, 0] }
  function d3_tip_html() { return ' ' }
​
  var direction_callbacks = {
    n:  direction_n,
    s:  direction_s,
    e:  direction_e,
    w:  direction_w,
    nw: direction_nw,
    ne: direction_ne,
    sw: direction_sw,
    se: direction_se
  };
​
  var directions = Object.keys(direction_callbacks);
​
  function direction_n() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.n.y - node.offsetHeight,
      left: bbox.n.x - node.offsetWidth / 2
    }
  }
​
  function direction_s() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.s.y,
      left: bbox.s.x - node.offsetWidth / 2
    }
  }
​
  function direction_e() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.e.y - node.offsetHeight / 2,
      left: bbox.e.x
    }
  }
​
  function direction_w() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.w.y - node.offsetHeight / 2,
      left: bbox.w.x - node.offsetWidth
    }
  }
​
  function direction_nw() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.nw.y - node.offsetHeight,
      left: bbox.nw.x - node.offsetWidth
    }
  }
​
  function direction_ne() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.ne.y - node.offsetHeight,
      left: bbox.ne.x
    }
  }
​
  function direction_sw() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.sw.y,
      left: bbox.sw.x - node.offsetWidth
    }
  }
​
  function direction_se() {
    var bbox = getScreenBBox()
    return {
      top:  bbox.se.y,
      left: bbox.e.x
    }
  }
​
  function initNode() {
    var node = d3.select(document.createElement('div'))
    node
      .style('position', 'absolute')
      .style('top', 0)
      .style('opacity', 0)
      .style('pointer-events', 'none')
      .style('box-sizing', 'border-box')
​
    return node.node()
  }
​
  function getSVGNode(el) {
    el = el.node()
    if(el.tagName.toLowerCase() === 'svg')
      return el
​
    return el.ownerSVGElement
  }
​
  function getNodeEl() {
    if(node === null) {
      node = initNode();
      // re-add node to DOM
      document.body.appendChild(node);
    };
    return d3.select(node);
  }
​
  // Private - gets the screen coordinates of a shape
  //
  // Given a shape on the screen, will return an SVGPoint for the directions
  // n(north), s(south), e(east), w(west), ne(northeast), se(southeast), nw(northwest),
  // sw(southwest).
  //
  //    +-+-+
  //    |   |
  //    +   +
  //    |   |
  //    +-+-+
  //
  // Returns an Object {n, s, e, w, nw, sw, ne, se}
  function getScreenBBox() {
    var targetel   = target || d3.event.target;
​
    while ('undefined' === typeof targetel.getScreenCTM && 'undefined' === targetel.parentNode) {
        targetel = targetel.parentNode;
    }
​
    var bbox       = {},
        matrix     = targetel.getScreenCTM(),
        tbbox      = targetel.getBBox(),
        width      = tbbox.width,
        height     = tbbox.height,
        x          = tbbox.x,
        y          = tbbox.y
​
    point.x = x
    point.y = y
    bbox.nw = point.matrixTransform(matrix)
    point.x += width
    bbox.ne = point.matrixTransform(matrix)
    point.y += height
    bbox.se = point.matrixTransform(matrix)
    point.x -= width
    bbox.sw = point.matrixTransform(matrix)
    point.y -= height / 2
    bbox.w  = point.matrixTransform(matrix)
    point.x += width
    bbox.e = point.matrixTransform(matrix)
    point.x -= width / 2
    point.y -= height / 2
    bbox.n = point.matrixTransform(matrix)
    point.y += height
    bbox.s = point.matrixTransform(matrix)
​
    return bbox
  }
​
  return tip
}
​
var data = [
   {date: "Mar 12", close: "53.98"},
   {date: "Apr 12", close: "67.00"},
   {date: "Mei 12", close: "89.70"},
   {date: "Jun 12", close: "67.00"},
   {date: "Jul 12", close: "89.70"},
   {date: "Aug 12", close: "99.00"}
]
​
// var data = [
//       {date: "30-Apr-12", close: "53.98"},
//       {date: "29-Apr-12", close: "67.00"},
//       {date: "28-Apr-12", close: "89.70"},
//       {date: "27-Apr-12", close: "67.00"},
//       {date: "26-Apr-12", close: "89.70"},
//       {date: "25-Apr-12", close: "99.00"},
//       {date: "24-Apr-12", close: "130.28"},
//       {date: "23-Apr-12", close: "166.70"},
//       {date: "22-Apr-12", close: "234.98"},
//       {date: "21-Apr-12", close: "345.44"},
//       {date: "20-Apr-12", close: "234.98"},
//       {date: "19-Apr-12", close: "345.44"},
//       {date: "18-Apr-12", close: "443.34"},
//       {date: "17-Apr-12", close: "543.70"},
//       {date: "16-Apr-12", close: "580.13"},
//       {date: "15-Apr-12", close: "605.23"},
//       {date: "14-Apr-12", close: "322.77"},
//       {date: "13-Apr-12", close: "105.23"},
//       {date: "12-Apr-12", close: "-422.77"},
//       {date: "11-Apr-12", close: "-126.20"},
//       {date: "10-Apr-12", close: "-88.44"},
//       {date: "9-Apr-12", close: "-236.23"},
//       {date: "8-Apr-12", close: "-433.68"},
//       {date: "7-Apr-12", close: "-524.31"},
//       {date: "6-Apr-12", close: "-629.32"},
//       {date: "5-Apr-12", close: "-433.68"},
//       {date: "4-Apr-12", close: "224.31"},
//       {date: "3-Apr-12", close: "529.32"},
//       {date: "2-Apr-12", close: "318.63"},
//       {date: "1-Apr-12", close: "99.55"}
//     ];
​
    var margin = {top: 20, right: 35, bottom: 25, left: 35},
        width = 680 - margin.left - margin.right,
        height = 280 - margin.top - margin.bottom;
​
    //Beautify the date
    var parseDate = d3.timeParse("%d-%b-%y");
​
    //Get the Amount of alerts for tooltip
    var bisectDate = d3.bisector(function(d) {
        return d.date;
    }).left;
​
//     var x = d3.scaleTime().range([0, width]);
    var x = d3.scaleBand().rangeRound([0, width]);
    var y = d3.scaleLinear().range([height, 0]);
    var xAxis = d3.axisBottom(x).ticks(5);
    var yAxis = d3.axisLeft(y).ticks(5);
​
    var area = d3.area()
        .x(function(d) {
            return x(d.date);
        })
        .y0(height)
        .y1(function(d) {
            return y(d.close);
        });
​
    var valueline = d3.line()
        .x(function(d) {
            return x(d.date);
        })
        .y(function(d) {
            return y(d.close);
//             return y(d.close) >= 0 ? y(0) : y(d.close);
        });
  
//     var valueline2 = d3.line()
//         .x(function(d) {
//             return x(d.date);
//         })
//         .y(function(d) {
//             return d.close < 0 ? y(0) : y(d.close);
//         });
​
    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 + ")");
​
    function make_x_axis() { // function for the x grid lines
        return d3.axisBottom(x)
            .ticks(5)
    }
​
    function make_y_axis() { // function for the y grid lines
        return d3.axisLeft(y)
            .ticks(5)
    }
​
//     data.forEach(function(d) {
//       d.date = parseDate(d.date);
//       d.close = +d.close;
//     });
//     data.sort(function(a, b) { return a.date - b.date; });
​
    // Scale the range of the data
//     x.domain(d3.extent(data, function(d) { return d.date; }));
    x.domain(d3.set(data.map(function(d) { return d.date })).values());
    y.domain( [d3.min(data, function(d) { return d.close; }), d3.max(data, function(d) { return d.close; })] );
​
//     svg.append("path")
//         .datum(data)
//         .attr("class", "area-chart above")
//          .style("stroke", "blue")
//         .style("stroke-width", "1")
//         .attr("d", area.y0(function(d){ return y(Math.min(d.close, 0)); }));
  
//     // Add the filled area
//     svg.append("path")
//         .datum(data)
//         .attr("class", "area-chart below")
//          .style("stroke", "black")
//         .style("stroke-width", "1")
//         .attr("d", area.y1(function(d){ return Math.max(y(0), -y(d.close))}));
​
    svg.append("g") // Draw the y Grid lines
    .attr("class", "grid")
        .call(make_y_axis()
            .tickSize(-width, 0, 0)
            .tickFormat("")
    )
​
    // Add the valueline path.
//     svg.append("path")
//          .datum(data)
//         .style("stroke", "white")
//         .style("stroke-width", "2")
//         .style("fill", "none")
//         .attr("class", "line-chart")
//         .attr("d", valueline);
  
    svg.append("path")
            .datum(data)
//         .style("stroke", "blue")
        .style("stroke-width", "2")
        .style("fill", "none")
        .attr("class", "line-chart")
        .attr("d", valueline)
​
    // 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)
​
    svg.append("rect")
        .attr("class", "overlay")
        .attr("width", width)
        .attr("height", height);
​
        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.period > d1.period - x0 ? d1 : d0;
        // var nx = x(d) + (x.bandwidth() / 2);
​
        focus.attr("transform", "translate(" + x(d.date) + "," + y(d.close) + ")");
        focus.select("text").text(d.close);
    }
​
    // Tooltip
    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")
​
    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);
​
</script>
​
​
</script>
​
    