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I'm working on a React component and I found a specific javascript code that modify the content of my html page.
The problem is that I don't know how to merge this script into my component. I know I can call it with an "import" statement but the script works with a "window.onload" function that will be called only one time, but my component is mounted several times and the script won't work anymore

The Component -

import React, { Component } from 'react';

import textRotation from '../../scripts/textRotation';

import './Main.scss';





class Main extends Component {

  constructor(props) {

    super(props);

    this.title = props.title;

    this.imgSrc = props.imgSrc;

  }



  render() {

    return (

      <div className="Main">

        <div className="main-content">

          <div className="presentation-caption">

            <span>Hello, I'm Jordan, a junior front-end developer, who does a lot of things.</span>

          </div>

          <div className="description-caption">

            <span>Prepare you to encounter various types of projects... but it's ok, just explore&nbsp;!</span>

          </div>

          <div className="button-container">

            <a href="#works"><button>Scroll down</button></a>

          </div>

        </div>

        <div className="side-content">

          <span

            className="txt-rotate"

            data-period="1100"

            data-rotate='[ "Web development", "Video editing", "Motion design", "Graphism", "Creativity" ]'></span><span>.</span>

        </div>

        <div className="side-text-portfolio">

          <span>ポ<br />ー<br />ト<br />フ<br />ォ<br />リ<br />オ</span>

        </div>

      </div>

    );

  }

}



export default Main;

The script -

var TxtRotate = function (el, toRotate, period) {

  this.toRotate = toRotate;

  this.el = el;

  this.loopNum = 0;

  this.period = parseInt(period, 10) || 2000;

  this.txt = '';

  this.tick();

  this.isDeleting = false;

};



TxtRotate.prototype.tick = function () {

  var i = this.loopNum % this.toRotate.length;

  var fullTxt = this.toRotate[i];



  if (this.isDeleting) {

    this.txt = fullTxt.substring(0, this.txt.length - 1);

  } else {

    this.txt = fullTxt.substring(0, this.txt.length + 1);

  }



  this.el.innerHTML = '<span class="wrap">' + this.txt + '</span>';



  var that = this;

  var delta = 300 - Math.random() * 100;



  if (this.isDeleting) { delta /= 2; }



  if (!this.isDeleting && this.txt === fullTxt) {

    delta = this.period;

    this.isDeleting = true;

  } else if (this.isDeleting && this.txt === '') {

    this.isDeleting = false;

    this.loopNum++;

    delta = 500;

  }



  setTimeout(function () {

    that.tick();

  }, delta);

};



window.onload = function () {

  var elements = document.getElementsByClassName('txt-rotate');

  for (var i = 0; i < elements.length; i++) {

    var toRotate = elements[i].getAttribute('data-rotate');

    var period = elements[i].getAttribute('data-period');

    if (toRotate) {

      new TxtRotate(elements[i], JSON.parse(toRotate), period);

    }

  }

  // INJECT CSS

  var css = document.createElement("style");

  css.type = "text/css";

  css.innerHTML = ".txt-rotate > .wrap { border-right: 0.08em solid #725070 }";

  document.body.appendChild(css);

};

If you have any solutions for adding the script into my Component, or the properly reload it ... thanks by advance

Change the script to this:

var TxtRotate = function (el, toRotate, period) {

  this.toRotate = toRotate;

  this.el = el;

  this.loopNum = 0;

  this.period = parseInt(period, 10) || 2000;

  this.txt = '';

  this.tick();

  this.isDeleting = false;

};



TxtRotate.prototype.tick = function () {

  var i = this.loopNum % this.toRotate.length;

  var fullTxt = this.toRotate[i];



  if (this.isDeleting) {

    this.txt = fullTxt.substring(0, this.txt.length - 1);

  } else {

    this.txt = fullTxt.substring(0, this.txt.length + 1);

  }



  this.el.innerHTML = '<span class="wrap">' + this.txt + '</span>';



  var that = this;

  var delta = 300 - Math.random() * 100;



  if (this.isDeleting) { delta /= 2; }



  if (!this.isDeleting && this.txt === fullTxt) {

    delta = this.period;

    this.isDeleting = true;

  } else if (this.isDeleting && this.txt === '') {

    this.isDeleting = false;

    this.loopNum++;

    delta = 500;

  }



  setTimeout(function () {

    that.tick();

  }, delta);

};



loadCall = function () {

  var elements = document.getElementsByClassName('txt-rotate');

  for (var i = 0; i < elements.length; i++) {

    var toRotate = elements[i].getAttribute('data-rotate');

    var period = elements[i].getAttribute('data-period');

    if (toRotate) {

      new TxtRotate(elements[i], JSON.parse(toRotate), period);

    }

  }

  // INJECT CSS

  var css = document.createElement("style");

  css.type = "text/css";

  css.innerHTML = ".txt-rotate > .wrap { border-right: 0.08em solid #725070 }";

  document.body.appendChild(css);

};



const loadMyScript = () => window.addEventListener('load', () => loadCall());



export default loadMyScript;

Then import loadMyScript and call loadMyScript() from the componentDidMount() function within your component.

If you are able to change the code in the script, you can change it to be callable instead of firing on load, i.e. give the function a name. And then you can call that function in the componentDidMount hook of your component.