react-native-modal/README.md

# react-native-modal

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An enhanced, animated and customizable react-native modal.

The goal of `react-native-modal` is expanding the original react-native `Modal` component by adding animations and styles customization options while still providing a plain-simple API.

<p align="center">
<img src="/.github/images/example-modal.gif" height="500" />
</p>

## Features

- Smooth enter/exit animations
- Plain simple and flexible APIs
- Customizable backdrop opacity, color and timing
- Listeners for the modal animations ending
- Resize itself correctly on device rotation
- Swipeable
- Scrollable

## Setup

This library is available on npm, install it with: `npm install --save react-native-modal` or `yarn add react-native-modal`.

## Usage

Since react-native-modal is an extension of the original react native modal, it works in a similar fashion [react-native original modal](https://facebook.github.io/react-native/docs/modal.html).

1.  Import react-native-modal:

```javascript
import Modal from "react-native-modal";
```

2.  Create a modal and nest its content inside of it:

```javascript
render () {
    return (
      <View>
        <Modal>
          <View style={{ flex: 1 }}>
            <Text>I am the modal content!</Text>
          </View>
        </Modal>
      </View>
    )
  }
```

3.  Then simply show it by setting the `isVisible` prop to true:

```javascript
render () {
    return (
      <View>
        <Modal isVisible={true}>
          <View style={{ flex: 1 }}>
            <Text>I am the modal content!</Text>
          </View>
        </Modal>
      </View>
    )
  }
```

The `isVisible` prop is the only prop you'll really need to make the modal work: you should control this prop value by saving it in your state and setting it to `true` or `false` when needed.

## A complete example

The following example consists in a component (`ModalTester`) with a button and a modal.
The modal is controlled by the `isModalVisible` state variable and it is initially hidden, since its value is `false`.  
Pressing the button sets `isModalVisible` to true, making the modal visible.  
Inside the modal there is another button that, when pressed, sets `isModalVisible` to false, hiding the modal.

```javascript
import React, { Component } from "react";
import { Button, Text, View } from "react-native";
import Modal from "react-native-modal";

export default class ModalTester extends Component {
  state = {
    isModalVisible: false
  };

  toggleModal = () => {
    this.setState({ isModalVisible: !this.state.isModalVisible });
  };

  render() {
    return (
      <View style={{ flex: 1 }}>
        <Button title="Show modal" onPress={this.toggleModal} />
        <Modal isVisible={this.state.isModalVisible}>
          <View style={{ flex: 1 }}>
            <Text>Hello!</Text>
            <Button title="Hide modal" onPress={this.toggleModal} />
          </View>
        </Modal>
      </View>
    );
  }
}
```

For a more complex example take a look at the `/example` directory.

## Available props

| Name                           | Type             | Default                        | Description                                                                                                                                |
| ------------------------------ | ---------------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------ |
| animationIn                    | string or object | 'slideInUp'                    | Modal show animation                                                                                                                       |
| animationInTiming              | number           | 300                            | Timing for the modal show animation (in ms)                                                                                                |
| animationOut                   | string or object | 'slideOutDown'                 | Modal hide animation                                                                                                                       |
| animationOutTiming             | number           | 300                            | Timing for the modal hide animation (in ms)                                                                                                |
| avoidKeyboard                  | bool             | false                          | Move the modal up if the keyboard is open                                                                                                  |
| coverScreen                    | bool             | true                           | Will use RN `Modal` component to cover the entire screen wherever the modal is mounted in the component hierarchy                          |
| hasBackdrop                    | bool             | true                           | Render the backdrop                                                                                                                        |
| backdropColor                  | string           | 'black'                        | The backdrop background color                                                                                                              |
| backdropOpacity                | number           | 0.70                           | The backdrop opacity when the modal is visible                                                                                             |
| backdropTransitionInTiming     | number           | 300                            | The backdrop show timing (in ms)                                                                                                           |
| backdropTransitionOutTiming    | number           | 300                            | The backdrop hide timing (in ms)                                                                                                           |
| customBackdrop                 | node             | null                           | The custom backdrop element                                                                                                                |
| children                       | node             | **REQUIRED**                   | The modal content                                                                                                                          |
| deviceHeight                   | number           | null                           | Device height (useful on devices that can hide the navigation bar)                                                                         |
| deviceWidth                    | number           | null                           | Device width (useful on devices that can hide the navigation bar)                                                                          |
| isVisible                      | bool             | **REQUIRED**                   | Show the modal?                                                                                                                            |
| onBackButtonPress              | func             | () => null                     | Called when the Android back button is pressed                                                                                             |
| onBackdropPress                | func             | () => null                     | Called when the backdrop is pressed                                                                                                        |
| onModalWillHide                | func             | () => null                     | Called before the modal hide animation begins                                                                                              |
| onModalHide                    | func             | () => null                     | Called when the modal is completely hidden                                                                                                 |
| onModalWillShow                | func             | () => null                     | Called before the modal show animation begins                                                                                              |
| onModalShow                    | func             | () => null                     | Called when the modal is completely visible                                                                                                |
| onSwipeStart                   | func             | () => null                     | Called when the swipe action started                                                                                                       |
| onSwipeMove                    | func             | (percentageShown) => null      | Called on each swipe event                                                                                                                 |
| onSwipeComplete                | func             | ({ swipingDirection }) => null | Called when the `swipeThreshold` has been reached                                                                                          |
| onSwipeCancel                  | func             | () => null                     | Called when the `swipeThreshold` has not been reached                                                                                      |
| scrollOffset                   | number           | 0                              | When > 0, disables swipe-to-close, in order to implement scrollable content                                                                |
| scrollOffsetMax                | number           | 0                              | Used to implement overscroll feel when content is scrollable. See `/example` directory                                                     |
| scrollTo                       | func             | null                           | Used to implement scrollable modal. See `/example` directory for reference on how to use it                                                |
| scrollHorizontal               | bool             | false                          | Set to true if your scrollView is horizontal (for a correct scroll handling)                                                               |
| swipeThreshold                 | number           | 100                            | Swiping threshold that when reached calls `onSwipeComplete`                                                                                |
| swipeDirection                 | string or array  | null                           | Defines the direction where the modal can be swiped. Can be 'up', 'down', 'left, or 'right', or a combination of them like `['up','down']` |
| useNativeDriver                | bool             | false                          | Defines if animations should use native driver                                                                                             |
| hideModalContentWhileAnimating | bool             | false                          | Enhances the performance by hiding the modal content until the animations complete                                                         |
| propagateSwipe                 | bool             | false                          | Allows swipe events to propagate to children components (eg a ScrollView inside a modal)                                                   |
| style                          | any              | null                           | Style applied to the modal                                                                                                                 |

## Frequently Asked Questions

### The component is not working as expected

Under the hood `react-native-modal` uses react-native original [Modal component](https://facebook.github.io/react-native/docs/modal.html).  
Before reporting a bug, try swapping `react-native-modal` with react-native original Modal component and, if the issue persists, check if it has already been reported as a [react-native issue](https://github.com/facebook/react-native/issues).

### The backdrop is not completely filled/covered on some Android devices (Galaxy, for one)

React-Native has a few issues detecting the correct device width/height of some devices.  
If you're experiencing this issue, you'll need to install [`react-native-extra-dimensions-android`](https://github.com/Sunhat/react-native-extra-dimensions-android).  
Then, provide the real window height (obtained from `react-native-extra-dimensions-android`) to the modal:

```javascript
render() {
  const deviceWidth = Dimensions.get("window").width;
  const deviceHeight = Platform.OS === "ios"
    ? Dimensions.get("window").height
    : require("react-native-extra-dimensions-android").get("REAL_WINDOW_HEIGHT");

  return (
  <Modal
    isVisible={this.state.isVisible}
    deviceWidth={deviceWidth}
    deviceHeight={deviceHeight}
  >
    <View style={{ flex: 1 }}>
      <Text>I am the modal content!</Text>
    </View>
  </Modal>
  )
}
```

### How can I hide the modal by pressing outside of its content?

The prop `onBackdropPress` allows you to handle this situation:

```javascript
<Modal
  isVisible={this.state.isVisible}
  onBackdropPress={() => this.setState({ isVisible: false })}
>
  <View style={{ flex: 1 }}>
    <Text>I am the modal content!</Text>
  </View>
</Modal>
```

### How can I hide the modal by swiping it?

The prop `onSwipeComplete` allows you to handle this situation (remember to set `swipeDirection` too!):

```javascript
<Modal
  isVisible={this.state.isVisible}
  onSwipeComplete={() => this.setState({ isVisible: false })}
  swipeDirection="left"
>
  <View style={{ flex: 1 }}>
    <Text>I am the modal content!</Text>
  </View>
</Modal>
```

Note that when using `useNativeDriver={true}` the modal won't drag correctly. This is a [known issue](https://github.com/react-native-community/react-native-modal/issues/163#issuecomment-409760695).

### The modal flashes in a weird way when animating

Unfortunately this is a [know issue](https://github.com/react-native-community/react-native-modal/issues/92) that happens when `useNativeDriver=true` and must still be solved.  
In the meanwhile as a workaround you can set the `hideModalContentWhileAnimating` prop to `true`: this seems to solve the issue.
Also, do not assign a `backgroundColor` property directly to the Modal. Prefer to set it on the child container.

### The modal background doesn't animate properly

Are you sure you named the `isVisible` prop correctly? Make sure it is spelled correctly: `isVisible`, not `visible`.

### The modal doesn't change orientation

Add a `supportedOrientations={['portrait', 'landscape']}` prop to the component, as described [in the React Native documentation](https://facebook.github.io/react-native/docs/modal.html#supportedorientations).

Also, if you're providing the `deviceHeight` and `deviceWidth` props you'll have to manually update them when the layout changes.

### I can't show multiple modals one after another

Unfortunately right now react-native doesn't allow multiple modals to be displayed at the same time.
This means that, in `react-native-modal`, if you want to immediately show a new modal after closing one you must first make sure that the modal that your closing has completed its hiding animation by using the `onModalHide` prop.

### I can't show multiple modals at the same time

See the question above.
Showing multiple modals (or even alerts/dialogs) at the same time is not doable because of a react-native bug.
That said, I would strongly advice against using multiple modals at the same time because, most often than not, this leads to a bad UX, especially on mobile (just my opinion).

### The StatusBar style changes when the modal shows up

This issue has ben discussed [here](https://github.com/react-native-community/react-native-modal/issues/50).  
The TLDR is: it's a know React-Native issue with the Modal component 😞

### The modal is not covering the entire screen

The modal style applied by default has a small margin.  
If you want the modal to cover the entire screen you can easily override it this way:

```js
<Modal style={{ margin: 0 }}>...</Modal>
```

### I can't scroll my ScrollView inside of the modal

Enable propagateSwipe to allow your child components to receive swipe events:

```js
<Modal propagateSwipe>...</Modal>
```

Please notice that this is still a WIP fix and might not fix your issue yet, see [issue #236](https://github.com/react-native-community/react-native-modal/issues/236).

### The modal enter/exit animation flickers

Make sure your `animationIn` and `animationOut` are set correctly.  
We noticed that, for example, using `fadeIn` as an exit animation makes the modal flicker (it should be `fadeOut`!).
Also, some users have noticed that setting backdropTransitionOutTiming={0} can fix the flicker without affecting the animation.

### The custom backdrop doesn't fill the entire screen

You need to specify the size of your custom backdrop component. You can also make it expand to fill the entire screen by adding a `flex: 1` to its style:

```javascript
<Modal
  isVisible={this.state.isVisible}
  customBackdrop={<View style={{ flex: 1 }} />}
>
  <View style={{ flex: 1 }}>
    <Text>I am the modal content!</Text>
  </View>
</Modal>
```

### The custom backdrop doesn't dismiss the modal on press

You can provide an event handler to the custom backdrop element to dismiss the modal. The prop `onBackdropPress` is not supported for a custom backdrop.

```javascript
<Modal
  isVisible={this.state.isVisible}
  customBackdrop={
    <TouchableWithoutFeedback onPress={dismissModalHandler}>
      <View style={{ flex: 1 }} />
    </TouchableWithoutFeedback>
  }
/>

```

## Available animations

Take a look at [react-native-animatable](https://github.com/oblador/react-native-animatable) to see the dozens of animations available out-of-the-box. You can also pass in custom animation definitions and have them automatically register with react-native-animatable. For more information on creating custom animations, see the react-native-animatable [animation definition schema](https://github.com/oblador/react-native-animatable#animation-definition-schema).

## Acknowledgements

Thanks [@oblador](https://github.com/oblador) for react-native-animatable, [@brentvatne](https://github.com/brentvatne) for the npm namespace and to anyone who contributed to this library!

Pull requests, feedbacks and suggestions are welcome!