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Alert.js
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133 lines (125 loc) · 4.13 KB
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule Alert
* @flow
*/
'use strict';
var AlertIOS = require('AlertIOS');
var Platform = require('Platform');
var DialogModuleAndroid = require('NativeModules').DialogManagerAndroid;
import type { AlertType, AlertButtonStyle } from 'AlertIOS';
type Buttons = Array<{
text?: string;
onPress?: ?Function;
style?: AlertButtonStyle;
}>;
/**
* 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 iOS and Android and can show static
* alerts. To show an alert that prompts the user to enter some information,
* see `AlertIOS`; entering text in an alert is common on iOS only.
*
* ## iOS
*
* On iOS you can specify any number of buttons. Each button can optionally
* specify a style, which is one of 'default', 'cancel' or 'destructive'.
*
* ## 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')
*
* ```
* // 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')},
* ]
* )
* ```
*/
class Alert {
static alert(
title: ?string,
message?: ?string,
buttons?: Buttons,
type?: AlertType,
): void {
if (Platform.OS === 'ios') {
if (typeof type !== 'undefined') {
console.warn('Alert.alert() with a 4th "type" parameter is deprecated and will be removed. Use AlertIOS.prompt() instead.');
AlertIOS.alert(title, message, buttons, type);
return;
}
AlertIOS.alert(title, message, buttons);
} else if (Platform.OS === 'android') {
AlertAndroid.alert(title, message, buttons);
}
}
}
/**
* Wrapper around the Android native module.
*/
class AlertAndroid {
static alert(
title: ?string,
message?: ?string,
buttons?: Buttons,
): void {
var config = {
title: title || '',
message: message || '',
};
// At most three buttons (neutral, negative, positive). Ignore rest.
// The text 'OK' should be probably localized. iOS Alert does that in native.
var validButtons: Buttons = buttons ? buttons.slice(0, 3) : [{text: 'OK'}];
var buttonPositive = validButtons.pop();
var buttonNegative = validButtons.pop();
var buttonNeutral = validButtons.pop();
if (buttonNeutral) {
config = {...config, buttonNeutral: buttonNeutral.text || '' }
}
if (buttonNegative) {
config = {...config, buttonNegative: buttonNegative.text || '' }
}
if (buttonPositive) {
config = {...config, buttonPositive: buttonPositive.text || '' }
}
DialogModuleAndroid.showAlert(
config,
(errorMessage) => console.warn(message),
(action, buttonKey) => {
if (action !== DialogModuleAndroid.buttonClicked) {
return;
}
if (buttonKey === DialogModuleAndroid.buttonNeutral) {
buttonNeutral.onPress && buttonNeutral.onPress();
} else if (buttonKey === DialogModuleAndroid.buttonNegative) {
buttonNegative.onPress && buttonNegative.onPress();
} else if (buttonKey === DialogModuleAndroid.buttonPositive) {
buttonPositive.onPress && buttonPositive.onPress();
}
}
);
}
}
module.exports = Alert;