Introduction

Playwright can interact with the web page dialogs such as alert, confirm, prompt as well as beforeunload confirmation. For print dialogs, see Print.

alert(), confirm(), prompt() dialogs

By default, dialogs are auto-dismissed by Playwright, so you don't have to handle them. However, you can register a dialog handler before the action that triggers the dialog to either [method: Dialog.accept] or [method: Dialog.dismiss] it.

page.on('dialog', dialog => dialog.accept());
await page.getByRole('button').click();

page.onDialog(dialog -> dialog.accept());
page.getByRole(AriaRole.BUTTON).click();

page.on("dialog", lambda dialog: dialog.accept())
await page.get_by_role("button".click())

page.on("dialog", lambda dialog: dialog.accept())
page.get_by_role("button").click()

Page.Dialog += async (_, dialog) =>
{
    await dialog.AcceptAsync();
};
await Page.GetByRole(AriaRole.Button).ClickAsync();

:::note [event: Page.dialog] listener must handle the dialog. Otherwise your action will stall, be it [method: Locator.click] or something else. That's because dialogs in Web are modals and therefore block further page execution until they are handled. :::

As a result, the following snippet will never resolve:

:::warning WRONG! :::

page.on('dialog', dialog => console.log(dialog.message()));
await page.getByRole('button').click(); // Will hang here

page.onDialog(dialog -> System.out.println(dialog.message()));
page.getByRole(AriaRole.BUTTON).click(); // Will hang here

page.on("dialog", lambda dialog: print(dialog.message))
await page.get_by_role("button").click() # Will hang here

page.on("dialog", lambda dialog: print(dialog.message))
page.get_by_role("button").click() # Will hang here

page.Dialog += (_, dialog) => Console.WriteLine(dialog.Message);
await page.GetByRole(AriaRole.Button).ClickAsync(); // Will hang here

:::note If there is no listener for [event: Page.dialog], all dialogs are automatically dismissed. :::

beforeunload dialog

When [method: Page.close] is invoked with the truthy [option: Page.close.runBeforeUnload] value, the page runs its unload handlers. This is the only case when [method: Page.close] does not wait for the page to actually close, because it might be that the page stays open in the end of the operation.

You can register a dialog handler to handle the beforeunload dialog yourself:

page.on('dialog', async dialog => {
  assert(dialog.type() === 'beforeunload');
  await dialog.dismiss();
});
await page.close({ runBeforeUnload: true });

page.onDialog(dialog -> {
  assertEquals("beforeunload", dialog.type());
  dialog.dismiss();
});
page.close(new Page.CloseOptions().setRunBeforeUnload(true));

async def handle_dialog(dialog):
    assert dialog.type == 'beforeunload'
    await dialog.dismiss()

page.on('dialog', lambda: handle_dialog)
await page.close(run_before_unload=True)

def handle_dialog(dialog):
    assert dialog.type == 'beforeunload'
    dialog.dismiss()

page.on('dialog', lambda: handle_dialog)
page.close(run_before_unload=True)

Page.Dialog += async (_, dialog) =>
{
    Assert.AreEqual("beforeunload", dialog.Type);
    await dialog.DismissAsync();
};
await Page.CloseAsync(new() { RunBeforeUnload = true });

Print dialogs

In order to assert that a print dialog via window.print was triggered, you can use the following snippet:

await page.goto('<url>');

await page.evaluate('(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()');
await page.getByText('Print it!').click();

await page.waitForFunction('window.waitForPrintDialog');

page.navigate("<url>");

page.evaluate("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()");
page.getByText("Print it!").click();

page.waitForFunction("window.waitForPrintDialog");

await page.goto("<url>")

await page.evaluate("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()")
await page.get_by_text("Print it!").click()

await page.wait_for_function("window.waitForPrintDialog")

page.goto("<url>")

page.evaluate("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()")
page.get_by_text("Print it!").click()

page.wait_for_function("window.waitForPrintDialog")

await Page.GotoAsync("<url>");

await Page.EvaluateAsync("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()");
await Page.GetByText("Print it!").ClickAsync();

await Page.WaitForFunctionAsync("window.waitForPrintDialog");

This will wait for the print dialog to be opened after the button is clicked. Make sure to evaluate the script before clicking the button / after the page is loaded.

Source: docs/src/dialogs.md