I have written this code to access my variable
outside the function
.The value of res
outside the function
is undefined
. the outside console.log should print the url
which is assigned to res
inside the function
. I will use this response in my anchor
tag
to open the url
in res
variable. What am I doing wrong?
const firebaseApp = initializeApp(firebaseconfig)
const storage = getStorage(firebaseApp)
var res;
const downloadurl = function() { getDownloadURL(ref(storage, 'files/linpeas.txt'))
.then((url) => {
res = url
console.log(res)
})};
console.log(res)
Try using the useState()
to store res
and the useEffect()
to update res
when this changes;
const firebaseApp = initializeApp(firebaseconfig)
const storage = getStorage(firebaseApp)
const [res, setRes] = useState();
const downloadurl = () => { getDownloadURL(ref(storage, 'files/linpeas.txt'))
.then((url) => {
setRes(url);
console.log(res)
})
.catch((error) => console.log(error));
};
useEffect(() => {
console.log(res);
}, [res]);