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Window alert() Method

Window Object Reference Window Object

Example

Display an alert box:

alert("Hello! I am an alert box!!");

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Definition and Usage

The alert() method displays an alert box with a specified message and an OK button.

An alert box is often used if you want to make sure information comes through to the user.

Note: The alert box takes the focus away from the current window, and forces the browser to read the message. Do not overuse this method, as it prevent the user from accessing other parts of the page until the box is closed.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The alert() method is supported in all major browsers.


Syntax

alert(message)

Parameter Values

Parameter Description
message Optional. Specifies the text to display in the alert box, or an object converted into a string and displayed

Return Value

No return value.


More Examples

Example

Alert box with line-breaks:

alert("Hello\nHow are you?");

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Example

Alert the hostname of the current URL:

alert(location.hostname);

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Window Object Reference Window Object

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