Edit

Alert

Launches an alert dialog with the specified title and message.

Optionally provide a list of buttons. Tapping any button will fire the respective onPress callback and dismiss the alert. By default, the only button will be an 'OK' button.

This is an API that works both on Android and iOS and can show static alerts. Alert that prompts the user to enter some information is avaiable on iOS only.

Example

• Function Component Example
• Class Component Example

import React, { useState } from "react";
import { View, StyleSheet, Button, Alert } from "react-native";

const App = () => {
  const createTwoButtonAlert = () =>
    Alert.alert(
      "Alert Title",
      "My Alert Msg",
      [
        {
          text: "Cancel",
          onPress: () => console.log("Cancel Pressed"),
          style: "cancel"
        },
        { text: "OK", onPress: () => console.log("OK Pressed") }
      ]
    );

  const createThreeButtonAlert = () =>
    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") }
      ]
    );

  return (
    <View style={styles.container}>
      <Button title={"2-Button Alert"} onPress={createTwoButtonAlert} />

      <Button title={"3-Button Alert"} onPress={createThreeButtonAlert} />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: "space-around",
    alignItems: "center"
  }
});

export default App;

import React, { Component } from "react";
import { View, StyleSheet, Button, Alert } from "react-native";

class App extends Component {
  createTwoButtonAlert = () =>
    Alert.alert(
      "Alert Title",
      "My Alert Msg",
      [
        {
          text: "Cancel",
          onPress: () => console.log("Cancel Pressed"),
          style: "cancel"
        },
        { text: "OK", onPress: () => console.log("OK Pressed") }
      ]
    );

  createThreeButtonAlert = () =>
    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") }
      ]
    );

  render() {
    return (
      <View style={styles.container}>
        <Button title={"2-Button Alert"} onPress={this.createTwoButtonAlert} />

        <Button
          title={"3-Button Alert"}
          onPress={this.createThreeButtonAlert}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: "space-around",
    alignItems: "center"
  }
});

export default App;

iOS

On iOS you can specify any number of buttons. Each button can optionally specify a style, avaiable options are represented by the AlertButtonStyle enum.

Android

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. It is disabled by default and can be enabled by providing an optional Options parameter with the cancelable property set to true i.e.
{ cancelable: true }.

The cancel event can be handled by providing an onDismiss callback property inside the options parameter.

Example

Android

import React from "react";
import { View, StyleSheet, Button, Alert } from "react-native";

const showAlert = () =>
  Alert.alert(
    "Alert Title",
    "My Alert Msg",
    [
      {
        text: "Cancel",
        onPress: () => Alert.alert("Cancel Pressed"),
        style: "cancel",
      },
    ],
    {
      cancelable: true,
      onDismiss: () =>
        Alert.alert(
          "This alert was dismissed by tapping outside of the alert dialog."
        ),
    }
  );

const App = () => (
  <Button title="Show alert" onPress={showAlert} />
);

export default App;

---

Reference

Methods

alert()

static alert(title, message?, buttons?, options?)

Parameters:

Name	Type	Description
title	string Required	The dialog's title. Passing null or empty string will hide the title.
message	string	An optional message that appears below the dialog's title.
buttons	Buttons	An optional array containg buttons configuration.
options	Options Android	An optional Alert configuration for the Android.

---

prompt()

iOS

static prompt(title, message?, callbackOrButtons?, type?, defaultValue?, keyboardType?)

Create and display a prompt to enter some text in form of Alert.

Parameters:

Name	Type	Description
title	string Required	The dialog's title.
message	string	An optional message that appears above the text input.
callbackOrButtons	function Buttons	If passed a function, it will be called with the prompt's value (text: string) => void, when the user taps 'OK'. If passed an array, buttons will be configured based on the array content.
type	AlertType	This configures the text input.
defaultValue	string	The default text in text input.
keyboardType	string	The keyboard type of first text field (if exists). One of TextInput keyboardTypes.

---

Type Definitions

AlertButtonStyle

iOS

An iOS Alert button style.

Type
enum

Constants:

Value	Description
'default'	Default button style.
'cancel'	Cancel button style.
'destructive'	Destructive button style.

---

AlertType

iOS

An iOS Alert type.

Type
enum

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

---

Buttons

Array of objects containg Alert buttons configuration.

Type
array of objects

Objects properties:

Name	Type	Description
text	string	Button label.
onPress	function	Callback function when button is pressed.
style iOS	AlertButtonStyle	Button style, on Android this property will be ignored.

---

Options

Android

Type
object

Properties:

Name	Type	Description
cancelable	boolean	Defines if alert can be dismissed by tapping outside of the alert box.
onDismiss	function	Callback function fired when alert has been dismissed.