prompt() Function

The prompt() function shows a message box that prompts the user for input.

Syntax

prompt()
prompt(message)
prompt(message, default_value)

Parameters

• message is an optional string to display in the message box.
• default_value is the optional default value to insert in the text field.

Return value

An optional String value:

• The user-provided text, if the OK button was pressed
• null if the Cancel button was pressed

Example

> prompt()
"Hello!"
> prompt("Where do you live?")
"Saskatchewan"

References

• prompt() function at MDN