Introduction –

Here we are going to discuss about “How to implement search in react native“.

I’ll choose this topic because in internet i am not finding a single tutorial which perform the search operation without using any third party library.

Example output –

Logic behind this

• We will load the list from the api call or you can make a custom array and then show it to the user.
• User can search the data by entering the text in search bar.
• After inserting the text we perform search on each text.
• We compare the inserted data with list of data.
• Then we will make store this data into state.
• After that we will re-render the list and the user will be able to see the filtered data.

So let’s start and follow each steps carefully.

Step 1 – Declaring state

Here we declare the state for storing search data

  this.state = {
      parentData: [],//storing API response
      isSearch: false,
      isAddParent: false,
      searchText: '',
    };

Step 2 – Design view for search bar

Here we are going to design the search bar using textInput with search bar icon also search and cross icon showing conditionally.

render() {
    return (
      <View
        style={{
          margin: moderateScale(15),
          marginRight: moderateScale(30),
          width: '90%',
          shadowColor: Colors.shadow,
          shadowOffset: {width: 0, height: 0},
          shadowOpacity: 1,
          borderWidth: Platform.OS === 'ios' ? 1 : 0,
          shadowRadius: moderateScale(8),
          elevation: moderateScale(8),
          backgroundColor: Colors.white,
          borderRadius: moderateScale(25),
          overflow: 'hidden',
          flexDirection: 'row',
        }}>
        <TextInput
          placeholder={translate('search_parent')}
          onChangeText={text => this.onChange(text)}
          value={this.state.searchText}
          style={{
            borderWidth: 0,
            color: 'black',
            fontSize: moderateScale(16),
            paddingLeft: moderateScale(20),
            width: '85%',
            fontFamily: Fonts.nunitoBold,
          }}
        />
        {this.state.searchText == '' ? (
          <Image
            source={Images.search_icon}
            style={{
              height: moderateScale(23),
              width: moderateScale(23),
              top: moderateScale(5),
              margin: moderateScale(8),
            }}
          />
        ) : (
          <TouchableOpacity
            onPress={() => {
              this.clearSearchBox();
            }}>
            <Image
              source={Images.close_pink}
              style={{
                height: moderateScale(18),
                width: moderateScale(18),
                top: moderateScale(5),
                margin: moderateScale(8),
              }}
            />
          </TouchableOpacity>
        )}
      </View>
    );
  }

Step 3 – Search functionality

Here we are going to provide the definition of search function, which is performed on change of text.

  onChange(searchText) {
    this.setState({searchText: searchText});
    if (searchText !== null && searchText !== undefined && searchText 
       !== '') {
      const {parentData} = this.state;
      var newArray = [];
      newArray = parentData.filter(function(text) {
        let user_name = text.first_name + ' ' + text.last_name;
        return 
         user_name.toLowerCase().includes(searchText.toLowerCase());
      });
      newArray !== null && newArray !== undefined && newArray.length > 0
        ? this.setState({
            parentData: newArray,
            isSearch: true,
          })
        : console.log('==========', this.state.parentData);
    } else {
      this.getParentApiCall(false);
    }
  }

Step 4 – For clear search box

 clearSearchBox() {
    setTimeout(() => {
      this.setState({searchText: '', isSearch: false});
    }, 100);
    this.getParentApiCall(false);
  }

Step 4 – Complete code for search functionality

Here you find the whole code for searching data from a list of array object.

import React, {Component} from 'react';
import {
  View,
  SafeAreaView,
  StyleSheet,
  Image,
  Text,
  TextInput,
  TouchableOpacity,
  Alert,
  TouchableWithoutFeedback,
} from 'react-native';
import {Colors, Images, Strings, Fonts} from '../themes';
import {Actions, ActionConst} from 'react-native-router-flux';
import NetInfo from '@react-native-community/netinfo';

const TAG = 'Parent';
export default class Parent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      parentData: [], //storing API response
      isSearch: false,
      isAddParent: false,
      searchText: '',
    };
  }

  onChange(searchText) {
    this.setState({searchText: searchText});
    if (searchText !== null && searchText !== undefined && searchText !== '') {
      const {parentData} = this.state;
      var newArray = [];
      newArray = parentData.filter(function(text) {
        let user_name = text.first_name + ' ' + text.last_name;
        return;
        user_name.toLowerCase().includes(searchText.toLowerCase());
      });
      newArray !== null && newArray !== undefined && newArray.length > 0
        ? this.setState({
            parentData: newArray,
            isSearch: true,
          })
        : console.log('==========', this.state.parentData);
    } else {
      this.getParentApiCall(false);
    }
  }

  clearSearchBox() {
    setTimeout(() => {
      this.setState({searchText: '', isSearch: false});
    }, 100);
    this.getParentApiCall(false);
  }

  render() {
    return (
      <View
        style={{
          margin: moderateScale(15),
          marginRight: moderateScale(30),
          width: '90%',
          shadowColor: Colors.shadow,
          shadowOffset: {width: 0, height: 0},
          shadowOpacity: 1,
          borderWidth: Platform.OS === 'ios' ? 1 : 0,
          shadowRadius: moderateScale(8),
          elevation: moderateScale(8),
          backgroundColor: Colors.white,
          borderRadius: moderateScale(25),
          overflow: 'hidden',
          flexDirection: 'row',
        }}>
        <TextInput
          placeholder={translate('search_parent')}
          onChangeText={text => this.onChange(text)}
          value={this.state.searchText}
          style={{
            borderWidth: 0,
            color: 'black',
            fontSize: moderateScale(16),
            paddingLeft: moderateScale(20),
            width: '85%',
            fontFamily: Fonts.nunitoBold,
          }}
        />
        {this.state.searchText == '' ? (
          <Image
            source={Images.search_icon}
            style={{
              height: moderateScale(23),
              width: moderateScale(23),
              top: moderateScale(5),
              margin: moderateScale(8),
            }}
          />
        ) : (
          <TouchableOpacity
            onPress={() => {
              this.clearSearchBox();
            }}>
            <Image
              source={Images.close_pink}
              style={{
                height: moderateScale(18),
                width: moderateScale(18),
                top: moderateScale(5),
                margin: moderateScale(8),
              }}
            />
          </TouchableOpacity>
        )}
      </View>
    );
  }
}

So we completed the react native search functionality in this tutorial which is “How to implement search in react native“.

You can find my post on medium as well click here please follow me on medium as well.

You can find my next post here.

If have any query/issue, please feel free to ask.

Happy Coding Guys.