A picker (dropdown) component for react native

React native dropdown picker

A picker (dropdown) component for react native which supports both Android & iOS.

Installation

via NPM

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

via Yarn

yarn add react-native-dropdown-picker

Basic Usage

First of all import the package.

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

Render the component.

<DropDownPicker
    items={[
        {label: 'Item 1', value: 'item1'},
        {label: 'Item 2', value: 'item2'},
    ]}
    defaultIndex={0}
    containerStyle={{height: 40}}
    onChangeItem={item => console.log(item.label, item.value)}
/>

Default item

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

Use one of these ways:

1. Add selected: true to the object.

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

2. The defaultIndex property.

   defaultIndex={1}
   

3. The defaultValue property.

   defaultValue="item2"
   

Placeholder

You may want to have a placeholder while the default value is null.

Add the following properties to the component.

...
defaultNull
placeholder="Select an item"
...

Dynamic placeholder

In some cases you're going to create two or more pickers which are linked together.

Think of a country picker and city picker, whenever you're changing the country, the city picker should be reset and show the placeholder.

import React from 'react';
export default class MyComponent extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            country: null,
            city: null,
            cities: []
        };
    }

    changeCountry(item) {
        let city = null;
        let cities;
        switch (item.value) {
            case 'fr':
                cities = [
                    {label: 'Paris', value: 'paris'}
                ];
            break;
            case 'es':
                cities = [
                    {label: 'Madrid', value: 'madrid'}
                ];
            break;
        }

        this.setState({
            city,
            cities
        });
    }

    changeCity(item) {
        this.setState({
            city: item.value
        });
    }

    render() {
        return (
            <>
                <DropDownPicker
                    items={[
                        {label: 'France', value: 'fr'},
                        {label: 'Spain', value: 'es'},
                    ]}
                    defaultNull
                    placeholder="Select your country"
                    containerStyle={{height: 40}}
                    onChangeItem={item => this.changeCountry(item)}
                />
                <DropDownPicker
                    items={this.state.cities}
                    defaultNull={this.state.city === null}
                    placeholder="Select your city"
                    containerStyle={{height: 40}}
                    onChangeItem={item => this.changeCity(item)}
                />
            </>
        );
    }
}

Dropdown Overflow

Adding borders to the component will separate or overflow elements. to solve this issue you just need to add marginTop to the dropDownStyle and specify the value which fits your component well.

dropDownStyle={{marginTop: 2}}

Styling the component

You have 9 options 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.

   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={{alignItems: 'flex-start|flex-end|center'}}
   

5. The labelStyle property.

   This property gives full control over the label.

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

6. The placeholderStyle property.

   It is possible to style the placeholder text with this property.

   placeholderStyle={{fontWeight: 'bold'}}
   

7. The activeItemStyle property.

   This property allows you to style the active item.

   activeItemStyle={{alignItems: 'center'}}
   

8. The activeLabelStyle property.

   This property allows you to style the active label.

   activeLabelStyle={{color: 'red'}}
   

9. The arrowStyle property.

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

   arrowStyle={{marginRight: 10}}
   

Props

Name	Description	Type	Default	Required
items	The items for the component.	array		Yes
defaultIndex	The index of the default item.	number	0	No
defaultValue	The value of the default item.	any		No
defaultNull	This sets the choice to null which should be used with placeholder	bool	true	No
placeholder	Default text to be shown to the user which must be used with defaultNull	string	'Select an item'	No
dropDownMaxHeight	Height of the dropdown box.	number	150	No
style	Additional styles for the picker.	object	{}	No
dropDownStyle	Additional styles for the dropdown box.	object	{}	No
containerStyle	Additional styles for the container view.	object	{}	No
itemStyle	Additional styles for the items.	object	{}	No
labelStyle	Additional styles for the labels.	object	{}	No
placeholderStyle	Additional styles for the placeholder text.	object	{}	No
activeItemStyle	Additional styles for the active item.	object	{}	No
activeLabelStyle	Additional styles for the active label.	object	{}	No
arrowStyle	Additional styles for the arrow.	object	{}	No
showArrow	An option to show/hide the arrow.	bool	true	No
arrowSize	The size of the arrow.	number	15	No
customArrowUp	Customize the arrow-up.	jsx	null	No
customArrowDown	Customize the arrow-down.	jsx	null	No
zIndex	This property specifies the stack order of the component.	number	5000	No
disabled	This disables the component.	bool	false	No
onChangeItem	Callback which returns item and index. The item is the selected object.	function		No

GitHub