ChartJS Line Chart

Multiple Line Chart

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.js"></script>
<body>
    <canvas id="chartJSContainer1" width="600" height="200"></canvas>
    
    <canvas id="chartJSContainer2" width="600" height="200"></canvas>
</body>

CSS

canvas { background-color : #eee;
}

JavaScript

var options = {
  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
			}
		]
  }
}

var canvas1 = document.getElementById('chartJSContainer1');
var chart1 = new Chart(canvas1, options);

var canvas2 = document.getElementById('chartJSContainer2');
var chart2 = new Chart(canvas2, options);

var getTheInfo = function(evt){
  //debugger;
  var theChart = (evt.target===canvas1) ? chart1 : chart2;
	var el = theChart.getElementAtEvent(evt);
  alert(el.length);
}

canvas1.addEventListener("click", getTheInfo)
document.body.addEventListener("click", getTheInfo)