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              <div id="svg-container">
  <div class="linegraph js-linegraph">
      <div>
          <button class="info-switcher js-info-switcher" data-year="1950" data-index="0"><span>1950</span></button>
          <button class="info-switcher js-info-switcher" data-year="1960" data-index="1"><span>1960</span></button>
          <button class="info-switcher js-info-switcher" data-year="1970" data-index="2"><span>1970</span></button>
          <button class="info-switcher js-info-switcher" data-year="1980" data-index="3"><span>1980</span></button>
          <button class="info-switcher js-info-switcher" data-year="1990" data-index="4"><span>1990</span></button>
      </div>
  </div>
</div>

            
          
!
            
              #svg-container{
  padding: 20px;
}
.stage{
  .axis{
    path{
        fill : none;
        stroke: black;
        shape-rendering: crispEdges;
    }
    line {
        display: none;
    }
    text {
        font-size: 10px;
    }
  }
  .grid{
    line{
        stroke: rgba(0,0,0,0.15);
        stroke-width: 1;
        shape-rendering: crispEdges;
    }
  }
}
.info-switcher{
    display: inline-block;
    padding: 0;
    border: none;
    outline: none;
    background: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    > span{
        display: inline-block;
        padding: 12px 20px;
        line-height: 1;
        background: #e6e7e8;
        border-radius: 5px;
        -webkit-transition: background 250ms, color 250ms;;
        transition: background 250ms, color 250ms;;
    }
    &:hover{
      > span{
          background: slategray; 
          -webkit-transition: background 250ms;
          transition: background 250ms;
      }
    }
    &.active{
      > span{
          color: #fff;
          background: slategray; 
          -webkit-transition: background 250ms, color 250ms;
          transition: background 250ms, color 250ms;
      }
    }
}

.linegraph {
  .graphLine{
    stroke: rgba(112, 128, 144, 0.4);
    stroke-width: 2;
    shape-rendering: crispEdges;
    fill: none;
  }
}
            
          
!
            
              class base{
    constructor(target, width, height, translate) {
        /*** general ***/
        this.target = target;
        this.$target = $(this.target);
        this.$switcher = this.$target.find('.js-info-switcher');
        this.svg = {};
        /*** property for stage ***/
        this.width = width;
        this.height = height;
        this.translate = translate;
        this.color = d3.scale.category10();
        /*** property for axis/grid ***/
        this.maxX = 0;
        this.maxY = 0;
        this.maxR = 0;
        this.step = 50;
        this.xScale = 0;
        this.yScale = 0;
        this.rangeX = [];
        this.rangeY = [];
        this.gridRangeX = [];
        this.gridRangeY = [];
        /*** dataset ***/
        this.dataset = {};
    }
    init() {
        const scope = this;
        scope.generate();
    }
    generateComponent() {
        const scope = this;
        scope.generateStage();
        scope.generateGrid();
        scope.generateAxis();
    }
    generateStage() {
        const scope = this;
        scope.svg = d3.selectAll(scope.target)
            .append('svg')
            .attr({
                'width': scope.width,
                'height': scope.height,
                'class': 'stage'
            });
        scope.getRange();
        scope.getScale();
    }
    getRange() {
        const scope = this;
        let _valueX = [];
        let _valueY = [];
        let _valueR = [];
        let _dataset = {};
        _.each(scope.dataset, function(d) {
            _dataset = d;
            _.each(_dataset, function(map) {
                _valueX.push(map.x);
                _valueY.push(map.y);
            });
        });
        scope.maxX = Math.floor((d3.max(_valueX) + 50) / scope.step) * scope.step;
        scope.maxY = Math.floor((d3.max(_valueY) + 50) / scope.step) * scope.step;
        scope.maxX += scope.step / 2;
        scope.maxY += scope.step / 2;
        scope.rangeX = d3.range(scope.step, scope.maxX, scope.step);
        scope.rangeY = d3.range(scope.step, scope.maxY, scope.step);
        scope.gridRangeX = d3.range(0, scope.maxX, scope.step / 4);
        scope.gridRangeY = d3.range(0, scope.maxY, scope.step / 4);
    }
    getScale() {
        const scope = this;
        scope.xScale = d3.scale.linear()
            .domain([0, scope.maxX])
            .range([scope.translate, scope.width - scope.translate]);

        scope.yScale = d3.scale.linear()
            .domain([0, scope.maxY])
            .range([scope.height - scope.translate, scope.translate]);
    }
    generateGrid() {
        const scope = this;
        const gridX = scope.svg.append('g').attr('class', 'grid grid--x');
        const gridY = scope.svg.append('g').attr('class', 'grid grid--y');
        scope.svg.selectAll('g.grid--x')
            .selectAll('line.x')
            .data(scope.gridRangeX)
            .enter()
            .append('line')
            .attr({
                x1: function(d, i) {
                    return scope.xScale(d);
                },
                y1: function(d, i) {
                    return scope.yScale(0);
                },
                x2: function(d, i) {
                    return scope.xScale(d);
                },
                y2: function(d, i) {
                    return scope.yScale(scope.maxY);
                }
            });

        scope.svg.selectAll('g.grid--y')
            .selectAll('line.y')
            .data(scope.gridRangeY)
            .enter()
            .append('line')
            .attr({
                x1: function(d, i) {
                    return scope.xScale(0);
                },
                y1: function(d, i) {
                    return scope.yScale(d);
                },
                x2: function(d, i) {
                    return scope.xScale(scope.maxX);
                },
                y2: function(d, i) {
                    return scope.yScale(d);
                }
            });
    }
    generateAxis() {
        const scope = this;
        const _xAxis = d3.svg.axis()
            .scale(scope.xScale)
            .tickValues(scope.rangeX)
            .outerTickSize(0)
            .orient('bottom');

        const _yAxis = d3.svg.axis()
            .scale(scope.yScale)
            .tickValues(scope.rangeY)
            .outerTickSize(0)
            .orient('left');

        scope.svg.append('g')
            .attr({
                class: 'axis axis--x',
                transform: 'translate(0, ' + (scope.height - scope.translate) + ')'
            })
            .call(_xAxis);

        scope.svg.append('g')
            .attr({
                class: 'axis axis--y',
                transform: 'translate(' + scope.translate + ', 0)'
            })
            .call(_yAxis);
    }
}

class linegraph extends base {
    constructor() {
        const _target = '.js-linegraph';
        const _width = 560;
        const _height = 300;
        const _translate = 30;
        super(_target, _width, _height, _translate);
        this.index = 0;
        this.year = 1950;
        this.walker = {};
        this.graphLine = {};
        this.animTimer;
        this.dataset = {
            "1950": [
                { "x": 50, "y": 100 }, 
                { "x": 200, "y": 400 }, 
                { "x": 320, "y": 100 }, 
                { "x": 420, "y": 200 },
                { "x": 520, "y": 100 }
            ],
            "1960": [
                { "x": 70, "y": 80 },               
                { "x": 200, "y": 300 }, 
                { "x": 330, "y": 100 }, 
                { "x": 430, "y": 480 }, 
                { "x": 550, "y": 100 }
            ],
            "1970": [
                { "x": 50, "y": 100 }, 
                { "x": 150, "y": 200 },
                { "x": 250, "y": 100 }, 
                { "x": 370, "y": 150 }, 
                { "x": 500, "y": 100 }
            ],
            "1980": [
                { "x": 50, "y": 100 }, 
                { "x": 150, "y": 150 },
                { "x": 250, "y": 100 }, 
                { "x": 370, "y": 350 }, 
                { "x": 500, "y": 100 }
            ],
            "1990": [
                { "x": 50, "y": 150 },
                { "x": 150, "y": 50 },
                { "x": 300, "y": 350 },
                { "x": 450, "y": 250 },                             
                { "x": 550, "y": 450}               
            ]
        }
        this.init();
    }
    generate() {
        const scope = this;
        scope.generateComponent();
        scope.draw();
        scope.buttonInit();
    }
    draw() {
        const scope = this;
        let i = scope.index;
        let _dataset = [];
        let _line = d3.svg.line()
              .x(function(d,i) {return scope.xScale(d[0]);})
              .y(function(d,i) {return scope.yScale(d[1]);})
              .interpolate('cardinal');

        _.each(scope.dataset[scope.year], function(d){
            let _map = d;
            _dataset.push([_map.x, _map.y])
        });

        scope.graphLine = scope.svg.append('path')
                  .attr({
                    'd': _line(_dataset)
                  })
                  .classed('graphLine', true);
      
        scope.marker = scope.svg.selectAll('circle.marker')
                  .data(_dataset)
                  .enter()
                  .append('circle')
                  .attr({
                    'cx' : function(d){
                        return scope.xScale(d[0]);
                    },
                    'cy' : function(d){
                        return scope.yScale(d[1]);
                    },
                    'r' : 5,
                    'fill' : 'rgba(112, 128, 144, 0.7)',
                    'data-index': function(d,i){
                        return i;
                    }
                  })
                  .classed('marker', true);
    }
    buttonInit() {
        const scope = this;
        scope.$switcher.on('click', function(){
            const $this = $(this);
            const _key = $this.data('year');
            const _index = $this.data('index');
            let _dataset = [];
            scope.$switcher.filter('.active').removeClass('active');
            $this.addClass('active');

            let _line = d3.svg.line()
                  .x(function(d,i) { return scope.xScale(d[0]); })
                  .y(function(d,i) { return scope.yScale(d[1]); })
                  .interpolate('cardinal');

            _.each(scope.dataset[_key], function(d){
                let _map = d;
                _dataset.push([_map.x, _map.y])
            });

            scope.svg.selectAll('path.graphLine')
                .transition()
                .attr({
                    'd': _line(_dataset)
                });

            scope.svg.selectAll('circle.marker')
                .data(_dataset)
                .transition()
                .attr({
                    'cx': function(d){
                        return scope.xScale(d[0]);
                    },
                    'cy': function(d){
                        return scope.yScale(d[1]);
                    }
                });

        });

    }
}

document.addEventListener('DOMContentLoaded', function() {
    new linegraph();
}, false);
            
          
!
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