react beforeunload
window.addEventListener('beforeunload', (event) => {
event.returnValue = `Are you sure you want to leave?`;
});react beforeunload
window.addEventListener('beforeunload', (event) => {
event.returnValue = `Are you sure you want to leave?`;
});react beforeunload
let formChanged = false;
myForm.addEventListener('change', () => formChanged = true);
window.addEventListener('beforeunload', (event) => {
if (formChanged) {
event.returnValue = 'You have unfinished changes!';
}
});react beforeunload
const pendingOps = new Set();
window.addEventListener('beforeunload', (event) => {
if (pendingOps.size) {
event.returnValue = 'There is pending work. Sure you want to leave?';
}
});
function addToPendingWork(promise) {
pendingOps.add(promise);
const cleanup = () => pendingOps.delete(promise);
promise.then(cleanup).catch(cleanup);
}Copyright © 2021 Codeinu
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