Components: Picker

Renders the native picker component on iOS and Android. Example:

<Picker
  selectedValue={this.state.language}
  onValueChange={(lang) => this.setState({language: lang})}>
  <Picker.Item label="Java" value="java" />
  <Picker.Item label="JavaScript" value="js" />
</Picker>

Props

View props...

onValueChange function

Callback for when an item is selected. This is called with the following parameters: - itemValue: the value prop of the item that was selected - itemPosition: the index of the selected item in this picker

selectedValue any

Value matching value of one of the items. Can be a string or an integer.

style pickerStyleType

testID string

Used to locate this view in end-to-end tests.

androidenabled bool

If set to false, the picker will be disabled, i.e. the user will not be able to make a selection.

androidmode enum('dialog', 'dropdown')

On Android, specifies how to display the selection items when the user taps on the picker:

'dialog': Show a modal dialog. This is the default.
'dropdown': Shows a dropdown anchored to the picker view

androidprompt string

Prompt string for this picker, used on Android in dialog mode as the title of the dialog.

iositemStyle itemStylePropType

Style to apply to each of the item labels.

Examples

'use strict';

const React = require('react');
const ReactNative = require('react-native');
const StyleSheet = require('StyleSheet');
const UIExplorerBlock = require('UIExplorerBlock');
const UIExplorerPage = require('UIExplorerPage');

const {
  Picker,
  Text,
  TouchableWithoutFeedback,
} = ReactNative;
const Item = Picker.Item;

const PickerExample = React.createClass({

  statics: {
    title: '<Picker>',
    description: 'Provides multiple options to choose from, using either a dropdown menu or a dialog.',
  },

  getInitialState: function() {
    return {
      selected1: 'key1',
      selected2: 'key1',
      selected3: 'key1',
      color: 'red',
      mode: Picker.MODE_DIALOG,
    };
  },

  render: function() {
    return (
      <UIExplorerPage title="<Picker>">
        <UIExplorerBlock title="Basic Picker">
          <Picker
            style={styles.picker}
            selectedValue={this.state.selected1}
            onValueChange={this.onValueChange.bind(this, 'selected1')}>
            <Item label="hello" value="key0" />
            <Item label="world" value="key1" />
          </Picker>
        </UIExplorerBlock>
        <UIExplorerBlock title="Disabled picker">
          <Picker style={styles.picker} enabled={false} selectedValue={this.state.selected1}>
            <Item label="hello" value="key0" />
            <Item label="world" value="key1" />
          </Picker>
        </UIExplorerBlock>
        <UIExplorerBlock title="Dropdown Picker">
          <Picker
            style={styles.picker}
            selectedValue={this.state.selected2}
            onValueChange={this.onValueChange.bind(this, 'selected2')}
            mode="dropdown">
            <Item label="hello" value="key0" />
            <Item label="world" value="key1" />
          </Picker>
        </UIExplorerBlock>
        <UIExplorerBlock title="Picker with prompt message">
          <Picker
            style={styles.picker}
            selectedValue={this.state.selected3}
            onValueChange={this.onValueChange.bind(this, 'selected3')}
            prompt="Pick one, just one">
            <Item label="hello" value="key0" />
            <Item label="world" value="key1" />
          </Picker>
        </UIExplorerBlock>
        <UIExplorerBlock title="Picker with no listener">
          <Picker style={styles.picker}>
            <Item label="hello" value="key0" />
            <Item label="world" value="key1" />
          </Picker>
          <Text>
            Cannot change the value of this picker because it doesn't update selectedValue.
          </Text>
        </UIExplorerBlock>
        <UIExplorerBlock title="Colorful pickers">
          <Picker
            style={[styles.picker, {color: 'white', backgroundColor: '#333'}]}
            selectedValue={this.state.color}
            onValueChange={this.onValueChange.bind(this, 'color')}
            mode="dropdown">
            <Item label="red" color="red" value="red" />
            <Item label="green" color="green" value="green" />
            <Item label="blue" color="blue" value="blue" />
          </Picker>
          <Picker
            style={styles.picker}
            selectedValue={this.state.color}
            onValueChange={this.onValueChange.bind(this, 'color')}
            mode="dialog">
            <Item label="red" color="red" value="red" />
            <Item label="green" color="green" value="green" />
            <Item label="blue" color="blue" value="blue" />
          </Picker>
        </UIExplorerBlock>
      </UIExplorerPage>
    );
  },

  changeMode: function() {
    const newMode = this.state.mode === Picker.MODE_DIALOG
        ? Picker.MODE_DROPDOWN
        : Picker.MODE_DIALOG;
    this.setState({mode: newMode});
  },

  onValueChange: function(key: string, value: string) {
    const newState = {};
    newState[key] = value;
    this.setState(newState);
  },
});

var styles = StyleSheet.create({
  picker: {
    width: 100,
  },
});

module.exports = PickerExample;

Links: