How to load script in react component

A 2021 TypeScript example using functional components that works with NextJS

(ensures code only runs client-side)

declare global {
  interface Window {
    hbspt: any
  }
}

export default function Contact() {
  useEffect(() => {
    if (window && document) {
      const script = document.createElement('script')
      const body = document.getElementsByTagName('body')[0]
      script.src = '//js.hsforms.net/forms/v2.js'
      body.appendChild(script)
      script.addEventListener('load', () => {
        window.hbspt.forms.create({
          // this example embeds a Hubspot form into a React app but you can tweak it for your use case
          // any code inside this 'load' listener will run after the script is appended to the page and loaded in the client
        })
      })
    }
  }, [])

  return <div id="hbspt-form" className="p-5"></div>
}

the following method is worked for me. try, hope it will work for you. basically, you can create a script tag and append it to the body tag. like this--

var tag = document.createElement('script');
tag.async = true;
tag.src = 'THE PATH TO THE JS FILE OR A CDN LINK';
var body = document.getElementsByTagName('body')[0];
body.appendChild(tag);

you can use this on a life cycle hook of react like this.

componentDidMount() {
    var loadScript = function (src) {
      var tag = document.createElement('script');
      tag.async = false;
      tag.src = src;
      var body = document.getElementsByTagName('body')[0];
      body.appendChild(tag);
    }

    loadScript('PATH TO THE JS FILE OR CDN URL');
  }

I recommend using React Helmet. I've used it on a couple of Create-React-Apps, and it allows you to write actual script tags combined with vanilla JS.

It makes the process a lot smoother. So for you it'd be something like this once you've imported React Helmet.

<script language="javascript" src='http://tickettransaction.com/?bid='+ bid + '&sitenumber='+ site +'&tid=event_dropdown' ></ script>

This came to my rescue. This is the easiest way to load Script Tags

https://www.npmjs.com/package/react-script-tag

import ScriptTag from 'react-script-tag';

const Demo = props => (
<ScriptTag src="/path/to/resource.js" />
);

There are other ways to do this too :

https://medium.com/better-programming/4-ways-of-adding-external-js-files-in-reactjs-823f85de3668

Update 2022

Use https://usehooks-ts.com/react-hook/use-script. This also returns status and allows props like removeOnUnmount.

Most of packages to do the job are outdated at the date. I found a solution that maybe can be useful for someone and it´s using a hook with the advantage you can control the state and take action based on it.

import { useEffect, useState } from 'react';

export const useExternalScript = (url) => {
    let [state, setState] = useState(url ? "loading" : "idle");

    useEffect(() => {
        if (!url) {
            setState("idle");
            return;
        }

        let script = document.querySelector(`script[src="${url}"]`);

        const handleScript = (e) => {
            setState(e.type === "load" ? "ready" : "error");
        };

        if (!script) {
            script = document.createElement("script");
            script.type = "application/javascript";
            script.src = url;
            script.async = true;
            document.body.appendChild(script);
            script.addEventListener("load", handleScript);
            script.addEventListener("error", handleScript);
        }

        script.addEventListener("load", handleScript);
        script.addEventListener("error", handleScript);

        return () => {
            script.removeEventListener("load", handleScript);
            script.removeEventListener("error", handleScript);
        };
    }, [url]);

    return state;
};

Use it is simple as do:

const externalScript = 'https://player.live-video.net/1.6.1/amazon-ivs-player.min.js';
const scriptStatus = useExternalScript(externalScript);

useEffect(() => {
    if (scriptStatus === 'ready') {
        // Do something with it
    }
}, [scriptStatus]);