Answers for "dropdown in react native"

react native dropdown

// well designed multi select works with native base

import MultiSelectInput from 'native-base-select';

// ...

const [language, setLanguage] = React.useState({
  value: '',
  list: [
    { _id: 1, name: 'Hindi' },
    { _id: 2, name: 'English' },
    { _id: 3, name: 'Bengali' },
    { _id: 4, name: 'Marathi' },
    { _id: 5, name: 'Telugu' },
    { _id: 6, name: 'Tamil' },
    { _id: 7, name: 'Gujarati' },
    { _id: 8, name: 'Urdu' },
    { _id: 9, name: 'Kannada' },
    { _id: 10, name: 'Odia' },
    { _id: 11, name: 'Malayalam' },
    { _id: 12, name: 'Punjabi' },
    { _id: 13, name: 'Assamese' },
    { _id: 14, name: 'Maithili' },
    { _id: 15, name: 'Sanskrit' },
    { _id: 16, name: 'Nepali' },
    { _id: 17, name: 'Dzongkha' },
    { _id: 18, name: 'Bhojpuri' },
    { _id: 19, name: 'Tibetan' },
    { _id: 20, name: 'Sinhalese' },
    { _id: 21, name: 'Khasi' },
  ],
  selectedList: [],
  error: '',
});

<MultiSelectInput
  label="Language"
  placeholder="Select at least 2 Language"
  value={language.value}
  list={language.list}
  selectedList={language.selectedList}
  onSelection={(value: any) => {
    setLanguage({
      ...language,
      value: value.text,
      selectedList: value.selectedList,
      error: '',
    });
  }}
  errorText={language.error}
/>;

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}      
  		/>    
		);  
	}
}

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"
  }
});