JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 300px; width: 100%;"></div>

JavaScript

window.onload = function () {
  var chart = new CanvasJS.Chart("chartContainer", {
    title:{
      text: "Decrease the opacity of other Series on hoveing legend"
    },
    legend: {
    	cursor: "pointer",
      itemmouseover: function(e){
      	for(var i=0; i<e.chart.data.length; i++) {
        	
        	if(i != e.dataSeriesIndex)
        		e.chart.options.data[i].fillOpacity = 0;
        }
        e.chart.render();
      },
      itemmouseout: function(e){
      	for(var i=0; i<e.chart.data.length; i++) {
        	if(i != e.dataSeriesIndex)
        		e.chart.options.data[i].fillOpacity = null;
        }
        e.chart.render();
      }
    },
    data: [{
      type: "scatter",
      showInLegend: true,
      dataPoints: [
        { x: 10000, y: 1100 },
        { x: 11000, y: 1200 },
        { x: 13000, y: 1250 },
      ]
    },{
      type: "scatter",
      showInLegend: true,
      dataPoints: [
        { x: 10000, y: 1100 },
        { x: 11000, y: 1200 },
        { x: 13000, y: 1250 },
      ]
    }]
  });

  chart.render();
}