react-native/docs/alertios.md

---
id: alertios
title: AlertIOS
layout: docs
category: APIs
permalink: docs/alertios.html
next: animated
previous: alert
---

Use `AlertIOS` to display an alert dialog with a message or to create a prompt for user input on iOS. If you don't need to prompt for user input, we recommend using [`Alert.alert()`](docs/alert.html#alert) for cross-platform support.


### Examples

Creating an iOS alert:

```
AlertIOS.alert(
 'Sync Complete',
 'All your data are belong to us.'
);
```

Creating an iOS prompt:

```
AlertIOS.prompt(
  'Enter a value',
  null,
  text => console.log("You entered "+text)
);
```

Example with custom buttons:

```javascript
AlertIOS.alert(
 'Update available',
 'Keep your app up to date to enjoy the latest features',
 [
   {text: 'Cancel', onPress: () => console.log('Cancel Pressed'), style: 'cancel'},
   {text: 'Install', onPress: () => console.log('Install Pressed')},
 ],
);
```

Example with custom buttons:

```javascript
AlertIOS.prompt(
  'Enter password',
  'Enter your password to claim your $1.5B in lottery winnings',
  [
    {text: 'Cancel', onPress: () => console.log('Cancel Pressed'), style: 'cancel'},
    {text: 'OK', onPress: password => console.log('OK Pressed, password: ' + password)},
  ],
  'secure-text'
);
```

Example with the default button and a custom callback:

```javascript
AlertIOS.prompt(
  'Update username',
  null,
  text => console.log("Your username is "+text),
  null,
  'default'
);
```




### Methods

- [`alert`](docs/alertios.html#alert)
- [`prompt`](docs/alertios.html#prompt)


### Type Definitions

- [`AlertType`](docs/alertios.html#alerttype)
- [`AlertButtonStyle`](docs/alertios.html#alertbuttonstyle)
- [`ButtonsArray`](docs/alertios.html#buttonsarray)


---

# Reference

## Methods

### `alert()`

```javascript
AlertIOS.alert(title, [message], [callbackOrButtons])
```

Create and display a popup alert with a title and an optional message.

If passed a function in the `callbackOrButtons` param, it will be called when the user taps 'OK'. If passed an array of button configurations, each button should include  a `text` key, as well as optional `onPress` and `style` keys. `style`   should be one of 'default', 'cancel' or 'destructive'. See [ButtonsArray](docs/alertios.html#buttonsarray)

**Parameters:**

| Name | Type | Required | Description |
| - | - | - | - |
| title | string | Yes | The dialog's title. Passing null or '' will hide the title. |
| message | string | No | An optional message that appears below the dialog's title. |
| callbackOrButtons | function, [ButtonsArray](docs/alertios.html#buttonsarray) | No | This optional argument should be either a single-argument function or an [array of buttons](docs/alertios.html#buttonsarray). |



---

### `prompt()`

```javascript
AlertIOS.prompt(title, [message], [callbackOrButtons], [type], [defaultValue], [keyboardType])
```

Create and display a prompt to enter some text.

**Parameters:**

| Name | Type | Required | Description |
| - | - | - | - |
| title | string | Yes | The dialog's title. |
| message | string | No | An optional message that appears above the text   input. |
| callbackOrButtons | function, [ButtonsArray](docs/alertios.html#buttonsarray) | No | This optional argument should be either a single-argument function or an [array of buttons](docs/alertios.html#buttonsarray). |
| type | [AlertType](docs/alertios.html#alerttype) | No | This configures the text input. |
| defaultValue | string | No | The default text in text input. |
| keyboardType | string | No | The keyboard type of first text field(if exists).   One of 'default', 'email-address', 'numeric', 'phone-pad',   'ascii-capable', 'numbers-and-punctuation', 'url', 'number-pad',   'name-phone-pad', 'decimal-pad', 'twitter' or 'web-search'. |


## Type Definitions

### AlertType

An Alert button type.

| Type |
| - |
| enum('default', 'plain-text', 'secure-text', 'login-password') |


**Constants:**

| Value | Description |
| - | - |
| 'default' | Default alert with no inputs |
| 'plain-text' | Plain text input alert |
| 'secure-text' | Secure text input alert |
| 'login-password' | Login and password alert |


---

### AlertButtonStyle

An Alert button style.

| Type |
| - |
| enum('default', 'cancel', 'destructive') |


**Constants:**

| Value | Description |
| - | - |
| 'default' | Default button style |
| 'cancel' | Cancel button style |
| 'destructive' | Destructive button style |


---

### ButtonsArray

Array of objects that describe a button.

| Type |
| - |
| array of objects |


**Properties:**

| Name | Type | Description |
| - | - | - |
| [text] | string | Button label |
| [onPress] | function | Callback function when button pressed |
| [style] | [AlertButtonStyle](docs/alertios.html#alertbuttonstyle) | Button style |