ReactJs functional component add function to an eventListener and then invoke it

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Is it possible to create an event listener in a functional component and then invoke it from chrome console?

For example:

const Component = () => {
   const [hook,setHook] = useState();

   const handlerFunction = (arg) => {
      console.log(arg);
   }

   // how to add an event listener?
   return <div>Hello world<div>
}
react-functional-component reactjs javascript
1 Answers

The simplest solution would be to add a global variable:

const Component = () => {
    const [ value, setValue ] = useState();

    window.MY_GLOBAL_CONTAINER = (arg) => {
        setValue(arg);
        console.log(arg);
    };

   return <div>Hello world, { value }</div>
}

which you can access with:

MY_GLOBAL_CONTAINER('test')

Probably better to use a ref:

const Component = () => {
    const [ value, setValue ] = useState();
    const ref = useRef(null);

    useEffect(()=>{
        ref.current.handlerFunction = (arg) => {
            setValue(arg);
            console.log(arg);
        };
    },[])

    return <div ref={ ref } id="containerElementInsideTheDom">Hello world, { value }</div>
}

which you can access with:

document.getElementById('containerElementInsideTheDom').handlerFunction('test')
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