JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->
<div id="chartContainer" style="height: 360px; width: 100%;"></div>

JavaScript

var selected = -1;
var chart = new CanvasJS.Chart("chartContainer", {        
  title: {
    text: "Chart with Draggable stripLines in Candlestick Chart"
  },
  axisX: {
    interval:2,
    intervalType: "month",
    valueFormatString: "MMM-YY",
    labelAngle: -45
  },
  axisY: [{
    includeZero:false,
    title: "Prices",
    prefix: "$ ",
    stripLines: [{
      value: 4550,
      label: "4550",
      labelPlacement: "outside"
    }, {
      value: 5300,
      label: "5300",
      labelPlacement: "outside"
    }, {
      value: 6200,
      label: "6200",
      labelPlacement: "outside"
    }]
  }],
  data: [{
    type: "candlestick",
    dataPoints: [
      { x: new Date(2012,01,01),y:[5198, 5629, 5159, 5385]},
      {x: new Date(2012,02,01),y:[5366, 5499, 5135, 5295]},
      {x: new Date(2012,03,01),y:[5296, 5378, 5154, 5248]},
      {x: new Date(2012,04,01),y:[5254, 5279, 4788, 4924]},
      {x: new Date(2012,05,01),y:[4910, 5286, 4770, 5278]},
      {x: new Date(2012,06,01),y:[5283, 5348, 5032, 5229]},
      {x: new Date(2012,07,01),y:[5220, 5448, 5164, 5258]},
      {x: new Date(2012,08,01),y:[5276, 5735, 5215, 5703]},
      {x: new Date(2012,09,01),y:[5704, 5815, 4888, 5619]},
      {x: new Date(2012,10,01),y:[5609, 5885, 5548, 5879]},
      {x: new Date(2012,11,01),y:[5878, 5965, 5823, 5905]},
      {x: new Date(2013,00,01),y:[5937, 6111, 5935, 6034]},
      {x: new Date(2013,01,01),y:[6040, 6052, 5671, 5693]}
    ]
  }]
});

chart.render();

document.getElementsByClassName("canvasjs-chart-canvas")[1].addEventListener("mousedown", function(e) {
  var parentOffset = this.closest("#chartContainer").getBoundingClientRect();
  var relX = e.clientX - parentOffset.left;
  var relY = e.clientY - parentOffset.top;

  var snapDistance = 5;

  for(var i = 0; i < chart.options.axisY[0].stripLines.length; i++) {
    if(relX > chart.axisY[0].stripLines[i].get("bounds").x1 && relX < chart.axisY[0].stripLines[i].get("bounds").x2 && relY >...