The Window.alert()
method displays an alert dialog with the optional specified content and an OK button.
Syntax
window.alert(message);
Parameters
message
Optional- A string you want to display in the alert dialog, or, alternatively, an object that is converted into a string and displayed.
Example
window.alert("Hello world!"); alert("Hello world!");
Both produce:
Notes
The alert dialog should be used for messages which do not require any response on the part of the user, other than the acknowledgement of the message.
The following text is shared between this article, DOM:window.prompt and DOM:window.confirm 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).
Specification
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'alert()' in that specification. |
Living Standard |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
alert | Chrome
Full support
1
| Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera
Full support
3
| Safari Full support 1 | WebView Android
Full support
1
| Chrome Android
Full support
18
| Firefox Android Full support 4 | Opera Android
Full support
10.1
| Safari iOS Full support 1 | Samsung Internet Android
Full support
1.0
|
Legend
- Full support
- Full support
- See implementation notes.
- See implementation notes.