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Add beforeunload event listener when a form is open #311

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Add beforeunload event listener when a form is open #311

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25 changes: 25 additions & 0 deletions src/pages/FormPage.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,31 @@ function FormPage(): JSX.Element {
});
}, []);

// This will prompt the user before they try to exit the page
const cancelUnload = (event: BeforeUnloadEvent) => {
event.preventDefault();
// Not all browsers listen to preventDefault
event.returnValue = "";
return "";
};

useEffect(() => {
window.onbeforeunload = cancelUnload;

// The function we return is called when the page is unloaded
return () => {
window.onbeforeunload = null;
};
}, []);

useEffect(() => {
if (sent) {
window.onbeforeunload = null;
} else {
window.onbeforeunload = cancelUnload;
}
}, [sent]);

if (form && sent) {
const thanksStyle = css`font-family: "Uni Sans", "Hind", "Arial", sans-serif; margin-top: 15.5rem;`;
const divStyle = css`width: 80%;`;
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