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Theseus: 'unsaved changes' confirmation on programmatic navigation

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Adds a will-prevent-unload handler on each tab. When a page has a beforeunload
handler that returns non-null (typical for forms with unsaved input, in-browser
editors with a dirty document, etc.), Electron would silently cancel any
navigation attempt. Now we show a native two-button dialog — 'Stay on page' /
'Leave anyway' — matching how mainstream browsers behave.

Works for both user-initiated navigation (link clicks) AND our own programmatic
loads (address bar, chip switcher, in-tab collision prompt). Answers the
operator's ask: 'only if there is unsaved work that can be lost, should a
warning appear' (2026-08-02).
This commit is contained in:
Local Dev 2026-08-02 18:50:58 +02:00
parent d1aa46c8d2
commit b5712cbcc7
1 changed files with 19 additions and 1 deletions
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20
main.js
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@ -4,7 +4,7 @@
// h, Sia s3, direct ip, redirect u). Tabs, nav controls, a search box, a home
// page, and optional Tor onion routing. No system daemon; the app is the trust
// boundary.
const { app, BrowserWindow, WebContentsView, ipcMain, protocol, session, Menu, clipboard, nativeTheme, shell } = require("electron");
const { app, BrowserWindow, WebContentsView, ipcMain, protocol, session, Menu, clipboard, nativeTheme, shell, dialog } = require("electron");
const path = require("path");
const http = require("http");
const https = require("https");
@ -795,6 +795,24 @@ function createTab(initial, opts = {}) {
if (isBnsHost(parsed.hostname)) { e.preventDefault(); navigateTab(id, parsed.hostname + parsed.pathname); }
} catch {}
});
// "You have unsaved changes" confirmation: fires when the page's beforeunload
// handler is trying to keep the user on the page (e.g. an unsent form draft,
// an editor with a dirty document). Show a native confirm; on "Leave", call
// preventDefault to override the block. Applies to both link clicks AND our
// programmatic loads (chip switcher, address-bar navigation).
wc.on("will-prevent-unload", (e) => {
const parent = BrowserWindow.getFocusedWindow() || win;
const choice = dialog.showMessageBoxSync(parent, {
type: "question",
buttons: ["Stay on page", "Leave anyway"],
defaultId: 0,
cancelId: 0,
title: "Unsaved changes",
message: "This page is asking you to stay.",
detail: "You may have unsaved changes that will be lost if you leave.",
});
if (choice === 1) e.preventDefault(); // Leave anyway -> override the beforeunload
});
// Links that open a new tab: target="_blank", window.open, Ctrl/middle-click.
wc.setWindowOpenHandler(({ url, disposition }) => {
if (url && url !== "about:blank") createTab(url, { background: disposition === "background-tab" });