ChartJS Line Chart

Multiple Line Chart

by Leelenaleee

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.js"></script>
<body>
<button id="myButton">
Gen Chart
</button>
    <canvas id="chartJSContainer" width="600" height="400"></canvas>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
</body>

CSS

canvas { background-color : #eee;
}

JavaScript

var options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [
	    {
	      label: '# of Votes',
	      data: [12, 19, 3, 5, 2, 3],
      	borderWidth: 1
    	},	
			{
				label: '# of Points',
				data: [7, 11, 5, 8, 3, 7],
				borderWidth: 1
			}
		]
  },
  options: {
  	scales: {
    	yAxes: [{
        ticks: {
					reverse: false
        }
      }]
    }
  }
}

var options2 = {
  type: 'bar',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [
	    {
	      label: '# of Votes',
	      data: [12, 19, 3, 5, 2, 3],
      	borderWidth: 1
    	},	
			{
				label: '# of Points',
				data: [7, 11, 5, 8, 3, 7],
				borderWidth: 1
			}
		]
  },
  options: {
  	scales: {
    	yAxes: [{
        ticks: {
					reverse: false
        }
      }]
    }
  }
}

var chart = null;

var option1 = true;

const addChart = (chartConfig) => {
if (chart) chart.destroy();

var ctx = document.getElementById('chartJSContainer').getContext('2d');
chart = new Chart(ctx, chartConfig);

chart.update(); 
option1 = !option1;
}

document.getElementById('myButton').addEventListener("click", () => {
  option1 ? addChart(options) : addChart(options2);
});