Window prompt() method

JavaScript Window Object

prompt()method displays a dialog box with an optional message, prompting the user to enter some text.

The prompt dialog contains a single-line text box, a 'Cancel' button, and an 'OK' button.

If the user clicks 'OK', the prompt() method will return the input value. If the user clicks 'Cancel', the method returnsnull.

If you want the user to enter a value before entering the page, a prompt box is usually used.

Dialog is a modal window-Before the dialog is closed, they prevent the user from accessing the rest of the program interface. Therefore, you should not overuse any functions that create dialogs (or modal windows).

Syntax:

window.prompt(msg, default)

var name = prompt("Enter your name", "Someone");
if (name != null) {
　　　document.getElementById("output").innerHTML = "Hello "　+　name;
}

Browser Compatibility

All browsers fully support the prompt() method:

Parameter Value

Technical Details

More Examples

This example demonstrates the different types of dialog boxes supported by JavaScript:

Related References

Window (Window) Reference:alert() method

Window (Window) Reference:confirm() method

JavaScript Window Object