The Window.confirm() method displays a modal dialog with an optional message and two buttons, OK and Cancel.

Syntax

result = window.confirm(message);
  • message is the optional string to be displayed in the dialog.
  • result is a boolean value indicating whether OK or Cancel was selected (true means OK).

Example

if (window.confirm("Do you really want to leave?")) { 
  window.open("exit.html", "Thanks for Visiting!");
}

Produces:

firefox confirm
 

Notes

The following text is shared between this article, DOM:window.prompt and DOM:window.alert Dialog boxes are modal windows - they prevent the user from accessing the rest of the program's interface until the dialog box is closed. For this reason, you should not overuse any function that creates a dialog box (or modal window). And regardless, there are very good reasons to avoid using dialog boxes for confirmation.

Starting with Chrome 46.0 this method is blocked inside an <iframe> unless it sandbox attribute has the value allow-modal.

The argument is optional and not required by the spec.

Specification

Specification Status Comment
HTML Living Standard
The definition of 'confirm()' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 46, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
Edge Full support YesFirefox Full support YesIE Full support YesOpera Full support Yes
Notes
Full support Yes
Notes
Notes In Opera, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
Safari Full support YesWebView Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 46, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
Chrome Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting with Chrome 46, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
Edge Mobile Full support YesFirefox Android Full support YesOpera Android Full support Yes
Notes
Full support Yes
Notes
Notes In Opera, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
Safari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support
See implementation notes.
See implementation notes.

See also

Document Tags and Contributors

Last updated by: fscholz,