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.

Mozilla Chrome users (e.g. Firefox extensions) should use methods of nsIPromptService instead.

Starting with Chrome 45.0 this method is blocked inside a sandboxed <iframe> unless the modal flag is enabled.

The argument is optional and not required by the spec.

Specification

Specification Status Comment
HTML5 Web application
The definition of 'confirm()' in that specification.
Unknown Initial definition.

See also

Hide Sidebar