How to Warn Users About Unsaved Changes in JavaScript

How to Warn Users About Unsaved Changes in JavaScript

Ferenc Almasi β€’ 2020 September 12 β€’ Read time 1 min read
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JavaScript

Attach a function on the beforeunload event to alert users before leaving your site:

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// Warn your users if they have unsaved changes and plan to leave
window.onbeforeunload = () => {
    alert('You have unsaved changes, your work will be lost.');
};
warn.js

This will show an alert to your users, so they know to save before leaving. The event is fired right before the window is about to be unloaded.

How to Warn Users About Unsaved Changes in JavaScript
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