rn-picker-dropdown v1.0.1

React native dropdown picker v4

NOTE: THIS IS SAME LIBRARY WITH https://github.com/hossein-zare/react-native-dropdown-picker

The only changes applied are mentioned in this comment: https://github.com/hossein-zare/react-native-dropdown-picker/issues/84#issuecomment-742657954

A single / multiple, categorizable & searchable item picker (dropdown) component for react native which supports both Android & iOS.

Screenshots

Table of contents

• React native dropdown picker v4
  • NOTE: THIS IS SAME LIBRARY WITH https://github.com/hossein-zare/react-native-dropdown-picker
  • The only changes applied are mentioned in this comment: https://github.com/hossein-zare/react-native-dropdown-picker/issues/84#issuecomment-742657954
  • Screenshots
  • Table of contents
  • Dependencies
  • Changelog
  • Getting Started
    • Installation
      • via NPM
      • via Yarn
    • Basic Usage
      • Single Item
      • Multiple Items
    • Available Item Properties
    • Category Support
    • Searchable Items
    • Default Item
    • Placeholder
    • Controller
      • Class Components
      • Functional Components
    • Styling The Component
    • RTL Support
    • FAQ
      • How to close other pickers when opening another picker?
      • borderRadius
      • zIndex conflicts (Untouchable Items, Overlapping pickers)
      • Dropdown Overflow
    • Props

Dependencies

Make sure react-native-vector-icons is installed.
https://github.com/oblador/react-native-vector-icons

Changelog

• Added childrenContainerStyle. Februrary 13, 2021
• Added textStyle viewStyle & untouchable props to items. Februrary 13, 2021
• Added category support. Februrary 13, 2021
• Added globalTextStyle. February 11, 2021
• Added onSearch. January 27, 2021
• Added labelProps. January 06, 2021
• Some bug-fixes. January 06, 2021
• Added containerProps. December 21, 2020

Getting Started

Installation

via NPM

npm install react-native-dropdown-picker --save

via Yarn

yarn add react-native-dropdown-picker

Basic Usage

The first step is to import the package.

import DropDownPicker from 'react-native-dropdown-picker';

Single Item

Select a single item.

import Icon from 'react-native-vector-icons/Feather';

this.state = {
    country: 'uk'
}

<DropDownPicker
    items={[
        {label: 'USA', value: 'usa', icon: () => <Icon name="flag" size={18} color="#900" />, hidden: true},
        {label: 'UK', value: 'uk', icon: () => <Icon name="flag" size={18} color="#900" />},
        {label: 'France', value: 'france', icon: () => <Icon name="flag" size={18} color="#900" />},
    ]}
    defaultValue={this.state.country}
    containerStyle={{height: 40}}
    style={{backgroundColor: '#fafafa'}}
    itemStyle={{
        justifyContent: 'flex-start'
    }}
    dropDownStyle={{backgroundColor: '#fafafa'}}
    onChangeItem={item => this.setState({
        country: item.value
    })}
/>

Multiple Items

Select multiple items.

import Icon from 'react-native-vector-icons/Feather';

this.state = {
    countries: ['uk']
}

<DropDownPicker
    items={[
        {label: 'UK', value: 'uk', icon: () => <Icon name="flag" size={18} color="#900" />},
        {label: 'France', value: 'france', icon: () => <Icon name="flag" size={18} color="#900" />},
    ]}

    multiple={true}
    multipleText="%d items have been selected."
    min={0}
    max={10}

    defaultValue={this.state.countries}
    containerStyle={{height: 40}}
    itemStyle={{
        justifyContent: 'flex-start'
    }}
    onChangeItem={item => this.setState({
        countries: item // an array of the selected items
    })}
/>

Available Item Properties

Here's the type definition of an item.

type ItemType = {
    label: any; // required
    value: any; // required
    icon?: () => JSX.Element;
    hidden?: boolean;
    untouchable?: boolean;
    parent?: any;
    disabled?: boolean;
    selected?: boolean;
    viewStyle?: StyleProp<ViewStyle>,
    textStyle?: StyleProp<TextStyle>,
};

Category Support

As of v4.x, You can simply categorize your items.

<DropDownPicker
    items={[
        {label: 'North America', value: 'na', untouchable: true}, // North America
        {label: 'United States', value: 'us', parent: 'na'},
        {label: 'Canada', value: 'canada', parent: 'na'},
        {label: 'Mexico', value: 'mexico', parent: 'na'},

        {label: 'Europe', value: 'eu', untouchable: true}, // Europe
        {label: 'UK', value: 'uk', parent: 'eu'},
        {label: 'Germany', value: 'germany', parent: 'eu'},
        {label: 'Russia', value: 'russia', parent: 'eu'},
    ]}
    
    ...
/>

The parent property must be equal to the value property of the parent item.
The untouchable property makes the item untouchable.

Searchable Items

Search for specific items.

searchable={true}
searchablePlaceholder="Search for an item"
searchablePlaceholderTextColor="gray"
seachableStyle={{}}
searchableError={() => <Text>Not Found</Text>}
onSearch={text => {
    // Example
    if (this._API.isFetching())
        this._API.abort();

    this._API = this.fetchFromServer(text, (items) => {
        // See controller: https://github.com/hossein-zare/react-native-dropdown-picker#controller
        this.controller.resetItems(items); // Maybe a new method will be introduced for a better UX!
    });
}}

Default Item

You may want to select one of the items as default.

Use one of the following options:

1. Add selected: true to the object. (This method is not state-friendly!)

   items={[
       {label: 'Item 1', value: 'item1'},
       {label: 'Item 2', value: 'item2', selected: true},
   ]}

2. The defaultValue property.

   defaultValue = 'uk'; // Single
   defaultValue = ['uk']; // Multiple

Placeholder

You may want to have a placeholder while the default value is null or an empty array.

Add the following properties to the component.

this.state = {
    data: null, // Single
    data: [] // Multiple
}

...
defaultValue={this.state.data}
placeholder="Select an item"
...

Controller

The controller property gives you full access to the DropDownPicker methods and properties.

Class Components

constructor(props) {
    this.state = {
        value: null,
        items: []
    }

    this.controller;
}

<DropDownPicker
    items={this.state.items}
    controller={instance => this.controller = instance}
    onChangeList={(items, callback) => {
        this.setState({
            items // items: items
        }, callback);
    }}

    defaultValue={this.state.value}
    onChangeItem={item => this.setState({
        value: item.value
    })}
/>

Functional Components

const [value, setValue] = useState(null);
const [items, setItems] = useState([ {...}, ... ]);
let controller;

<DropDownPicker
    items={items}
    controller={instance => controller = instance}
    onChangeList={(items, callback) => {
        new Promise((resolve, reject) => resolve(setItems(items)))
            .then(() => callback())
            .catch(() => {});
    }}

    defaultValue={value}
    onChangeItem={item => setValue(item.value)}
/>

in Class components you can call methods using this.controller.METHOD_NAME() and controller.METHOD_NAME() in Functional components.

1. Reset the state.

   You may want to reset the state of your picker.

   this.controller.reset();

2. Reset items.

   The second argument is your default value. (Optional)

   this.controller.resetItems([{}, {}, ...]);
   
   this.controller.resetItems([{}, {}, ...], 'uk'); // Single
   this.controller.resetItems([{}, {}, ...], ['uk', ...]); // Multiple

3. Select an item manually.

   You may want to select an item manually.

   // Single
   this.controller.selectItem('uk');
   
   // Multiple
   this.controller.selectItem(['uk', 'france']);

4. Add items manually.

   There are two methods to help you add items manually.

   this.controller.addItem({
     label: 'UK',
     value: 'uk',
     icon: () => {},
   });
   this.controller.addItems([
     {
       label: 'UK',
       value: 'uk',
       icon: () => {},
     },
   ]);

5. Remove items

   this.controller.removeItem('uk', {
     changeDefaultValue: true, // Unselect if the removed item is the selected item
   });

6. Check if the dropdown is open

   this.controller.isOpen(); // boolean

7. Open, close or toggle.

   this.controller.open();
   this.controller.close();
   this.controller.toggle();

Styling The Component

There are 14 props to style the component.

1. The style property.

   Use this to adjust the inner part of the picker.

   style={{paddingVertical: 10}}

2. The dropDownStyle property.

   Additional styles for the dropdown box.

   dropDownStyle={{backgroundColor: '#fafafa'}}

3. The containerStyle property.

   Use this to adjust the outer part of the picker such as margin, width, height, flex, ...

   containerStyle={{width: 150, height: 70}}

4. The itemStyle property.

   If you want the labels on the left and right side or to centerize them:

   itemStyle={{justifyContent: 'flex-start|flex-end|center'}}

5. The labelStyle property.

   This property gives full control over the label.

   labelStyle={{
       fontSize: 14,
       textAlign: 'left',
       color: '#000'
   }}

6. The selectedLabelStyle property.

   Changes the style of the selected item label.

   selectedLabelStyle={{
       color: '#39739d'
   }}

7. The placeholderStyle property.

   Style the placeholder text with this property.

   placeholderStyle={{
       fontWeight: 'bold',
       textAlign: 'center'
   }}

8. The activeItemStyle property.

   This property allows you to style the active item.

   activeItemStyle={{justifyContent: 'center'}}

9. The activeLabelStyle property.

   This property allows you to style the active label.

   activeLabelStyle={{color: 'red'}}

10. The arrowStyle property.

    Adds your additional styles to the View element of the arrow.

    arrowStyle={{marginRight: 10}}

11. The searchableStyle property.

    Additional styles for the TextInput

    searchableStyle={{backgroundColor: '#dfdfdf'}}

12. The searchablePlaceholderTextColor property.

    Assigns a new color to the placeholder text.

    searchablePlaceholderTextColor="silver"

13. The globalTextStyle property.

    You can style <Text /> elements globally.

    globalTextStyle={{
        fontFamily: "MyFontName",
        fontSize: 15
    }}

14. The childrenContainerStyle property.

    Style the children container View (See Category Support)

    childrenContainerStyle={{
        paddingLeft: 30
    }}

RTL Support

1. The selected item

   

   style={{
       flexDirection: 'row-reverse',
   }}
   labelStyle={{
       textAlign: 'right',
   }}

2. The dropdown items

   

   itemStyle={{
       flexDirection: 'row-reverse',
       justifyContent: 'flex-start',
   }}

FAQ

How to close other pickers when opening another picker?

this.state = {
    isVisibleA: false,
    isVisibleB: false,

    ...
}

changeVisibility(state) {
    this.setState({
        isVisibleA: false,
        isVisibleB: false,
        ...state
    });
}

// Picker A
<DropDownPicker
    isVisible={this.state.isVisibleA}
    onOpen={() => this.changeVisibility({
        isVisibleA: true
    })}
    onClose={() => this.setState({
        isVisibleA: false
    })}

    ...
/>

// Picker B
<DropDownPicker
    isVisible={this.state.isVisibleB}
    onOpen={() => this.changeVisibility({
        isVisibleB: true
    })}
    onClose={() => this.setState({
        isVisibleB: false
    })}

    ...
/>

borderRadius

Avoid using borderRadius and all the corners must be set separately.

style={{
    borderTopLeftRadius: 10, borderTopRightRadius: 10,
    borderBottomLeftRadius: 10, borderBottomRightRadius: 10
}}
dropDownStyle={{
    borderBottomLeftRadius: 20, borderBottomRightRadius: 20
}}

zIndex conflicts (Untouchable Items, Overlapping pickers)

1. Using the containerStyle property to style the picker results in unexpected behaviors like untouchable items.

   The style and dropDownStyle properties must be used instead.
   Use the containerStyle prop to adjust the outer part of the picker such as margin, width, height, flex, ...

2. Nested Views

   You have to add zIndex to the nested views which contain the picker.
   Note! zIndex locks the picker on Android, The solution is to use the Platform.OS

   import { Platform } from 'react-native';
   
   <View
       style={{
           ...(Platform.OS !== 'android' && {
               zIndex: 10
           })
       }}
   >
       <DropDownPicker ... />
   </View>

   Demo: https://snack.expo.io/@hossein-zare/823437

3. DropDownPicker wrapped by <View style={{backgroundColor: ..., border[...]: ..., elevation: ...}}>
   These props will make your dropdown untouchable.
   Remove all the backgroundColor, border[...], elevation, ... style properties from the parent element.
   https://github.com/hossein-zare/react-native-dropdown-picker/issues/40#issuecomment-651744446

4. Multiple Pickers

   <DropDownPicker zIndex={5000} />
   <DropDownPicker zIndex={4000} />
   <DropDownPicker zIndex={3000} />

Dropdown Overflow

Adding borders to the component separates elements or may overflow. To solve this issue add marginTop to the dropDownStyle and specify the value which fits your UI well.

dropDownStyle={{marginTop: 2}}

Props