mirror of
https://github.com/zhigang1992/react-native.git
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e11d496e9d
Summary:
Follow up to 9ec9567390
Closes https://github.com/facebook/react-native/pull/16759
Differential Revision: D6285219
Pulled By: hramos
fbshipit-source-id: 7012d257a5a6cff06cb2d94203a9379e4b7e3c4e
80 lines
2.0 KiB
Markdown
80 lines
2.0 KiB
Markdown
---
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id: alert
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title: Alert
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layout: docs
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category: APIs
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permalink: docs/alert.html
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next: alertios
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previous: actionsheetios
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---
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Launches an alert dialog with the specified title and message.
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Optionally provide a list of buttons. Tapping any button will fire the
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respective onPress callback and dismiss the alert. By default, the only
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button will be an 'OK' button.
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This is an API that works both on iOS and Android and can show static
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alerts. To show an alert that prompts the user to enter some information,
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see `AlertIOS`; entering text in an alert is common on iOS only.
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## iOS
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On iOS you can specify any number of buttons. Each button can optionally
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specify a style, which is one of 'default', 'cancel' or 'destructive'.
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## Android
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On Android at most three buttons can be specified. Android has a concept
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of a neutral, negative and a positive button:
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- If you specify one button, it will be the 'positive' one (such as 'OK')
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- Two buttons mean 'negative', 'positive' (such as 'Cancel', 'OK')
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- Three buttons mean 'neutral', 'negative', 'positive' (such as 'Later', 'Cancel', 'OK')
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By default alerts on Android can be dismissed by tapping outside of the alert
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box. This event can be handled by providing an optional `options` parameter,
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with an `onDismiss` callback property `{ onDismiss: () => {} }`.
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Alternatively, the dismissing behavior can be disabled altogether by providing
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an optional `options` parameter with the `cancelable` property set to `false`
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i.e. `{ cancelable: false }`
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Example usage:
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```
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// Works on both iOS and Android
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Alert.alert(
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'Alert Title',
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'My Alert Msg',
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[
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{text: 'Ask me later', onPress: () => console.log('Ask me later pressed')},
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{text: 'Cancel', onPress: () => console.log('Cancel Pressed'), style: 'cancel'},
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{text: 'OK', onPress: () => console.log('OK Pressed')},
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],
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{ cancelable: false }
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)
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```
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### Methods
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- [`alert`](docs/alert.html#alert)
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---
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# Reference
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## Methods
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### `alert()`
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```javascript
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Alert.alert(title, message?, buttons?, options?, type?)
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```
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