[Chartjs]-Creating dropdown options with Chart.js using select tag and multiple canvas

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The <select> element has an array of options and an attribute named selectedIndex. So to get the selected option: 

let select = document.querySelector('#chartType');
// concat Chart for the canvas ID
let chart = select.options[select.selectedIndex].value + 'Chart';

EDIT ——————————————————- correction —^, add .value here

Then grab all the canvases and hide all but the one selected:

document.querySelectorAll('canvas')
.forEach(c => {c.style.display = (c.id === chart)? 'inherit' : 'none';})

let select = document.querySelector('#chartType');

select.addEventListener('change', showHide);

function showHide() {
  // concat Chart for the canvas ID
  let chart = this.options[select.selectedIndex].value + 'Chart';
    document.querySelectorAll('canvas')
    .forEach(c => {
      c.style.display = (c.id === chart) ? 'inherit' : 'none';
    })
}

var ctx = document.getElementById("lineChart");
var lineChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ["2000", "2005", "2010", "2015", "2018"],
    datasets: [{
      label: 'Vancouver Population Data',
      data: [195000, 2093000, 2278000, 2485000, 2597000],
      borderColor: [
        'rgba(255,99,132,1)'
      ],
      backgroundColor: ['rgba(255,200,200,0.3)'],
      borderWidth: 1,
      //borderDash:([3]),
      pointBackgroundColor: "red",
      pointBorderColor: "rgba(250,10,10,0.1)",
      pointBorderWidth: "10",
      pointStyle: "rectRounded",
      pointHoverBackgroundColor: "rgba(255,0,0,0.5)",
      pointHoverBorderColor: "rgba(255,255,100,0.7)",
      pointHoverRadius: "10",
      //showLine:false,
      //steppedLine:"false"
    }]
  },
  options: {
    title: {
      display: true,
      text: "Vancouver Population",
      fontSize: 20,
      fontColor: "rgba(20,20,20,1)"
    },
    legend: {
      display: false,
      position: 'right',
      labels: {
        fontColor: '#000'
      },
    },
    elements: {
      line: {
        tension: 0, //disables bezier curves
      }
    },
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true,
          callback: function(value, index, values) {
            return value + " people"
          }
        }

      }]
    },
    /*animation: {
        duration:0, // general animation time
    },*/
    hover: {
      animationDuration: 0, // duration of animations when hovering an item
    },
    responsiveAnimationDuration: 0, // animation duration after a resize
  }
});

// Precipitation
var ctx = document.getElementById("barChart");
var BarChart = new Chart(ctx, {
  type: 'bar',
  data: {
    labels: ["May 2017", "June 2017", "July 2017", "Aug 2017", "Sep 2017", "Oct 2017", "Nov 2017", "Dec 2017", "Jan 2018", "Feb 2018", "Mar 2018", "Apr 2018", "May 2018"],
    datasets: [{
      label: "Precipitation Data",
      data: [102.2, 46.4, 1.8, 5.0, 29.4, 114.8, 197.0, 170.6, 249.4, 105.8, 111.8, 134.8, 1.4],
      backgroundColor: [
        'rgba(255,99,132,0.5)',
        'rgba(155,130,32,0.5)',
        'rgba(105,9,132,0.5)',
        'rgba(15,130,202,0.5)',
        'rgba(15,250,252,0.5)',
        'rgba(205,100,32,0.5)',
        'rgba(0,205,0,0.5)',
        'rgba(55,15,52,0.5)',
        'rgba(255,0,0,0.5)',
        'rgba(25,59,52,0.5)',
        'rgba(0,100,55,0.5)',
        'rgba(200,111,199,0.5)',
      ],
      borderColor: [
        'rgba(255,99,132,1)',
        'rgba(155,130,32,1)',
        'rgba(105,9,132,1)',
        'rgba(15,130,202,1)',
        'rgba(15,250,252,1)',
        'rgba(205,100,32,0.5)',
        'rgba(0,205,0,1)',
        'rgba(55,15,52,1)',
        'rgba(255,0,0,1)',
        'rgba(25,59,52,1)',
        'rgba(0,100,55,1)',
        'rgba(200,111,199,1)',
      ],
      borderWidth: "1",
      pointHoverBackgroundColor: "#fff",
      hoverBorderColor: "#fff",
    }]
  },
  options: {
    title: {
      display: true,
      text: "Vancouver Precipitation",
      fontSize: 20,
      fontColor: "rgba(10,0,20,0.9)"
    },
    legend: {
      display: false,
      position: 'right',
      labels: {
        fontColor: '#000'
      }
    },
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true,
          callback: function(value, index, values) {
            return value + " mm"
          }
        }
      }]
    }
  },
});

// Ethnicity 
var ctx = document.getElementById("pieChart");
var PieChart = new Chart(ctx, {
  type: 'pie',
  data: {
    labels: ['European Candadian', 'Chinese', 'South Asia', 'Fillipino', 'Southeast Asian', 'Japanese', 'Latin American', 'Mixed visible minority', 'Korean', 'Aboriginal', 'West Asian', 'Black', 'Arab'],
    datasets: [{
      label: "Ethnicity",
      data: [46.2, 27.7, 6, 6, 3, 1.7, 1.6, 1.5, 1.5, 2, 1.2, 1, 0.5],
      backgroundColor: [
        'rgba(255,99,132,0.5)',
        'rgba(155,130,32,0.5)',
        'rgba(105,9,132,0.5)',
        'rgba(15,130,202,0.5)',
        'rgba(15,250,252,0.5)',
        'rgba(205,100,32,0.5)',
        'rgba(0,205,0,0.5)',
        'rgba(55,15,52,0.5)',
        'rgba(255,0,0,0.5)',
        'rgba(25,59,52,0.5)',
        'rgba(0,100,55,0.5)',
        'rgba(200,231,50,0.5)',
        'rgba(155,22,30,0.5)',
      ],
      borderColor: [
        'rgba(255,99,132,0.5)',
        'rgba(155,130,32,0.5)',
        'rgba(105,9,132,0.5)',
        'rgba(15,130,202,0.5)',
        'rgba(15,250,252,0.5)',
        'rgba(205,100,32,0.5)',
        'rgba(0,205,0,0.5)',
        'rgba(55,15,52,0.5)',
        'rgba(255,0,0,0.5)',
        'rgba(25,59,52,0.5)',
        'rgba(0,100,55,0.5)',
        'rgba(200,231,50,0.5)',
        'rgba(155,22,30,0.5)',
      ],
      borderWidth: [1]
    }],
    cutoutPercentage: [0]

  },
  options: {
    title: {
      display: true,
      text: "Vancouver Ethnicity",
      fontSize: "20",
      fontColor: "rgba(20,20,20,1)"
    },
  }
});

// Radar
Chart.defaults.scale.ticks.beginAtZero = true;

var ctx = document.getElementById("radarChart");
var RadarChart = new Chart(ctx, {
  type: 'radar',
  data: {
    labels: ['Hiking', 'Sporting Events', 'Stanley Park', 'Skiing & Snowboarding', 'Beaches', 'eating'],
    datasets: [{
        label: "Male",
        data: ['50', '70', '80', '60', '20', '70'],
        backgroundColor: [
          'rgba(255,155,32,0.5)',
        ],
        borderWidth: 1,
        pointBackgroundColor: ["yellow", "black", "green", "white", "skyblue", "red"],
        pointHoverBackgroundColor: ["black"],
        pointStyle: ["triangle"]
      },
      {
        label: "Female",
        data: ['60', '30', '80', '20', '50', '60'],
        backgroundColor: [
          'rgba(155,15,132,0.5)',
        ],
        borderWidth: 1,
        pointBackgroundColor: ["yellow", "black", "green", "white", "skyblue", "red"],
        pointHoverBackgroundColor: ["black"],
        pointStyle: ["triangle"]
      }
    ]
  },
  option: {
    title: {
      display: true,
      text: "Activities in Vancouver",
      fontSize: "20",
      fontColor: "rgba(10,0,20,0.9)"
    },
    legend: {
      display: false,
      position: 'right',
      labels: {
        fontColor: '#000',
      }
    },
    scales: {
      scale: {}
    }
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.min.js"></script>

<select id="chartType">
  <option value="line">Population</option>
  <option value="bar">Precipitation</option>
  <option value="pie">Ethnicity</option>
  <option value="radar">Activity</option>
</select>
<div class="chart_container">
  <canvas id="lineChart"></canvas>
  <canvas id="barChart"></canvas>
  <canvas id="pieChart"></canvas>
  <canvas id="radarChart"></canvas>
</div>

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