My current setup involves a Svelte application that includes form content. Whenever a modification is made within the form, an "unsaved change" alert can be triggered upon page refresh. However, when attempting to navigate to a different page using Svelte navigation after making a change in the form, I struggle to manage the unsaved change alert. Is there a way to address this issue using Svelte Navigator?
Although the original question was focused on Svelte navigator, here is a workaround for those utilizing SvelteKit:
beforeNavigate(({ cancel }) => {
if (dirty) {
if (!confirm('Are you sure you want to leave this page? You have unsaved changes that will be lost.')) {
cancel();
}
}
});
For more details, refer to the beforeNavigate documentation.
At the moment, it seems that direct support for this feature is not available. An alternative solution using a proxy can be implemented, but it may only work with pushstate calls and not with browser back and forth buttons. To address this limitation, it is recommended to use a history module that already supports blocking. The npm history module provides this functionality, which can be integrated with Svelte Navigator by referring to the custom history section in the readme and the custom hash history example.
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