react-native-macos/docs/alert.md

id	title	layout	category	permalink	next	previous
alert	Alert	docs	APIs	docs/alert.html	alertios	actionsheetios

Use Alert to display an alert dialog.

This is an API that works both on iOS and Android and can show static alerts. To show an alert that prompts the user to enter some information, see AlertIOS, as entering text in an alert is common on iOS only.

Optionally provide a list of buttons. Tapping any button will fire the respective onPress callback, and dismiss the alert. If no buttons are provided, a single 'OK' button will be displayed by default.

On iOS, you can specify any number of buttons.

On Android, at most three buttons can be specified. Android has a concept of a neutral, negative and a positive button:

• If you specify one button, it will be the 'positive' one (such as 'OK')
• Two buttons mean 'negative', 'positive' (such as 'Cancel', 'OK')
• Three buttons mean 'neutral', 'negative', 'positive' (such as 'Later', 'Cancel', 'OK')

Alerts on Android can be dismissed by tapping outside of the alert box. This event can be handled by providing an optional options parameter, with an onDismiss callback property { onDismiss: () => {} }.

Alternatively, the dismissing behavior can be disabled altogether by providing an optional options parameter with the cancelable property set to false, i.e. { cancelable: false }

Example usage:

// Works on both iOS and Android
Alert.alert(
  'Alert Title',
  'My Alert Msg',
  [
    {text: 'Ask me later', onPress: () => console.log('Ask me later pressed')},
    {text: 'Cancel', onPress: () => console.log('Cancel Pressed'), style: 'cancel'},
    {text: 'OK', onPress: () => console.log('OK Pressed')},
  ],
  { cancelable: false }
)

Methods

• alert

---

Reference

Methods

alert()

Alert.alert(title, [message], [buttons], [options])

Launches an alert dialog with the specified title, and optionally a message.

Name	Type	Required	Description
title	string	Yes	Alert title
message	string	No	Alert message
buttons	array	No	Array of buttons
options	object	No	See below.

The optional buttons array should be composed of objects with any of the following:

• text (string) - text to display for this button
• onPress (function) - callback to be fired when button is tapped
• style (string) - on iOS, specifies the button style, one of 'default', 'cancel', or 'destructive'

The options object may include the following keys:

• onDismiss - provide a callback function to handle dismissal on Android
• cancelable - set to false to disable the default dismissal behavior on Android