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Window: confirm() method

window.confirm() instructs the browser to display a dialog with an optional message, and to wait until the user either confirms or cancels the dialog.

Under some conditions — for example, when the user switches tabs — the browser may not actually display a dialog, or may not wait for the user to confirm or cancel the dialog.

Syntax

js

confirm(message)

Parameters

message

A string you want to display in the confirmation dialog.

Return value

A boolean indicating whether OK (true) or Cancel (false) was selected. If a browser is ignoring in-page dialogs, then the returned value is always false.

Examples

js

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

Produces:

Firefox confirm

Notes

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). Regardless, there are good reasons to avoid using dialog boxes for confirmation.

Alternatively <dialog> element can be used for confirmations.

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
confirm
1Starting with Chrome 46, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
12 1 4
3Starting with Opera 33, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
1
1Starting with Chrome 46, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
18Starting with Chrome 46, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
4
10.1Starting with Opera 33, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.
1
1.0Starting with Samsung Internet 5.0, this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.

See also

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https://developer.mozilla.org/en-US/docs/Web/API/Window/confirm