Answers for "react native dropdown"

react native dropdown

// How to install
npm install --save react-native-material-dropdown

// How to use
import React, { Component } from 'react';
import { Dropdown } from 'react-native-material-dropdown';

class Example extends Component {
  render() {
    let data = [
      {      value: 'Banana',    },
      {      value: 'Mango',    },
      {      value: 'Pear',    }];
    
    return (      
      <Dropdown        
      label='Favorite Fruit'        
      data={data}      
  		/>    
		);  
	}
}

picker change event react native

<Picker
        selectedValue={selectedValue}
        style={{ height: 50, width: 150 }}
        onValueChange={(itemValue, itemIndex) => setSelectedValue(itemValue)}
      >
        <Picker.Item label="Java" value="java" />
        <Picker.Item label="JavaScript" value="js" />
      </Picker>

how to make your own drop down react native

import React, { Component } from "react";
import { Picker, View, Text, StyleSheet } from "react-native";

export default class CategoryScreen extends Component {
  state = {
    selectedcat: "",
    category: [
      {
        itemName: "Samsung M20"
      },
      {
        itemName: "Nokia"
      },
      {
        itemName: "Apple"
      },
      {
        itemName: "Samsung M23"
      },
      {
        itemName: "Samsung M24"
      },
      {
        itemName: "Samsung M25"
      }
    ]
  };

  async onValueChangeCat(value) {
    this.setState({ selectedcat: value });
  }

  render() {
    return (
      <View style={styles.viewStyle}>
        <View style={{ flex: 0.3 }}>
          <Text style={styles.textStyle}>Categories</Text>
        </View>
        <View style={{ flex: 0.7, fontSize: 14 }}>
          <Picker
            itemStyle={styles.itemStyle}
            mode="dropdown"
            style={styles.pickerStyle}
            selectedValue={this.state.selectedcat}
            onValueChange={this.onValueChangeCat.bind(this)}
          >
            {this.state.category.map((item, index) => (
              <Picker.Item
                color="#0087F0"
                label={item.itemName}
                value={item.itemName}
                index={index}
              />
            ))}
          </Picker>
        </View>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  viewStyle: {
    flex: 1,
    alignSelf: "center",
    flexDirection: "row",
    width: "92%",
    justifyContent: "space-between",
    alignItems: "center"
  },
  itemStyle: {
    fontSize: 10,
    fontFamily: "Roboto-Regular",
    color: "#007aff"
  },
  pickerStyle: {
    width: "100%",
    height: 40,
    color: "#007aff",
    fontSize: 14,
    fontFamily: "Roboto-Regular"
  },
  textStyle: {
    fontSize: 14,
    fontFamily: "Roboto-Regular"
  }
});

dropdown menu in react native

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React, { Component } from "react";
import { Platform, StyleSheet, Text, View, Alert, YellowBox} from "react-native";
import { Menu, MenuProvider, MenuOptions, MenuOption, MenuTrigger} from "react-native-popup-menu";

export default class HomeActivity extends Component {

  constructor(props) {
     super(props);
     YellowBox.ignoreWarnings([
      'Warning: isMounted(...) is deprecated', 'Module RCTImageLoader'
    ]);
   }

  render() {
    return (
      <MenuProvider style={{ flexDirection: "column", padding: 30 }}>
        <Menu onSelect={value => alert(`You Clicked : ${value}`)}>

          <MenuTrigger  >
          <Text style={styles.headerText}>DropDown Menu</Text>
          </MenuTrigger  >

          <MenuOptions>
            <MenuOption value={"Login"}>
              <Text style={styles.menuContent}>Login</Text>
            </MenuOption>
            <MenuOption value={"Register"}>
              <Text style={styles.menuContent}>Register</Text>
            </MenuOption>
            <MenuOption value={"Download"}>
              <Text style={styles.menuContent}>Download</Text>
            </MenuOption>
            <MenuOption value={"Logout"}>
              <Text style={styles.menuContent}>Logout</Text>
            </MenuOption>
            <MenuOption value={3} disabled={true}>
              <Text style={styles.menuContent}>Disabled Menu</Text>
            </MenuOption>
          </MenuOptions>

        </Menu>
      </MenuProvider>
    );
  }
}

const styles = StyleSheet.create({
    headerText: {
    fontSize: 20,
    margin: 10,
    fontWeight: "bold"
  },
  menuContent: {
    color: "#000",
    fontWeight: "bold",
    padding: 2,
    fontSize: 20
  }
});

react native dropdown field

// npm install react-native-select-dropdown
// yarn add react-native-select-dropdown

import SelectDropdown from 'react-native-select-dropdown'
const countries = ["Egypt", "Canada", "Australia", "Ireland"]
<SelectDropdown
	data={countries}
	onSelect={(selectedItem, index) => {
		console.log(selectedItem, index)
	}}
	buttonTextAfterSelection={(selectedItem, index) => {
		// text represented after item is selected
		// if data array is an array of objects then return selectedItem.property to render after item is selected
		return selectedItem
	}}
	rowTextForSelection={(item, index) => {
		// text represented for each item in dropdown
		// if data array is an array of objects then return item.property to represent item in dropdown
		return item
	}}
/>