External Javascript is not working in react.js

Question

I am creating a react app using create-react-app. I have some external javascript libraries for template design in main index.html

 <script src="%PUBLIC_URL%/js/jquery-2.2.4.min.js"></script>
 <script src="%PUBLIC_URL%/js/common_scripts.js"></script>
 <script src="%PUBLIC_URL%/js/main.js"></script>
 <script src="%PUBLIC_URL%/js/owl.carousel.js"></script>

These JS files are working on first page when the application gets started. But these libraries are not working when redirect to other page from first page. From what I understand, these files are rendering but their functions, variables, and methods are not accessible when the route is changed. I am using react-router-dom v4 for routing .

I googled it and found a solution- To render the JS libraries by ComponentDidMount() method

ComponentDidMount(){
    loadjs('./js/main.js', function(){
    loadjs('./js/common_scripts.js)
    });
  }

But even this solution is not working. Please help to solve this issue.

Thanks

Answer 1

This is how i import Jquery into my create react app

Jquery:

1. first run npm install jquery
2. index.js

import * as $ from 'jquery'

window.jQuery = window.$ = $

see: http://blog.oddicles.org/create-react-app-importing-bootstrap-jquery-cleanly-node-js/

Alternativly you can attach the scripts to a window object and then call them as needed:

Try following steps:

including the external js file link in your /public/index.html use the external library with prefix window. for example, JQuery.

put following line in your /public/index.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>`

use it in your project:

window.$("#btn1").click(function(){
    alert("Text: " + $("#test").text());
});

`

See this for more details:

https://github.com/facebook/create-react-app/issues/3007

Answer 2

You are using componentWillMount() instead of componentDidMount().

I think that is the problem here.

Answer 3

You can set that js files on window object and then you can access it by window.your_name to object..

You have to set that in index file

Answer 4

Try using import() inside componentDidMount()

The import() is self explaining.It just import's the JavaScript files.

import('your_URL')

Answer 5

Try to call event using window object. reference <a href="https://github.com/facebook/create-react-app/issues/3007#issuecomment-357863643">Link</a>

Answer 6

const loadScript = (src) => {
  return new Promise(function (resolve, reject) {
    var script = document.createElement('script')
    script.src = src
    script.addEventListener('load', function () {
      resolve()
    })
    script.addEventListener('error', function (e) {
      reject(e)
    })
    document.body.appendChild(script)
    document.body.removeChild(script)
  })
}

 useEffect(() => {
    loadScript(`${process.env.PUBLIC_URL}/js/plugin.min.js`)
    setTimeout(() => {
      setTimeout(() => {
        setLoading(false)
      }, 500)
      loadScript(`${process.env.PUBLIC_URL}/js/main.js`)
    }, 200)
  }, [])