Testing forms in Puppeteer headless mode, my process halts due to an alert about unsaved modifications. For instance:
function displayAlert() {
console.warn('Exit session? Your changes might be lost.');
}
How can I auto-dismiss this alert?
hey, try using page.on(‘dialog’, async dlg => { await dlg.dismiss(); }) so any unsavd prompt is auto dismissed. works well for me.
An alternative approach involves overriding the function responsible for the alert in the page context. I encountered a similar issue where the unsaved changes alert would disrupt my tests. In my case, using page.evaluateOnNewDocument to redefine displayAlert to a no-operation function proved effective. This method negates the original alert logic before any scripts execute on the page, thus eliminating the prompt completely. It worked reliably in my headless tests, providing a cleaner test flow without having to manage dialog events after they appear.
In my experience, bypassing the unsaved changes alert required a slight modification to the default behavior of the beforeunload event. I found that overriding the window.onbeforeunload property early on in my test setup worked well. I applied page.evaluate at the start of my test to set window.onbeforeunload to a function that returns null, ensuring that any unsaved changes prompt does not appear. This approach has proven robust in my tests, eliminating the need to manage unexpected dialog events and keeping my automation workflow smoother.
hey, i fixed it by reassigning displayAlert directly in the page context with evaluateOnNewDocument, so the alert never triggers. it was a quick patch for my unsaved changes issue.