How to Change Focus Border Color in React Native TextInput

In React Native, changing the visual cues for focused input fields can enhance user interaction. The border color of a TextInput component is one such visual cue. This blog post delves into methods for changing the focus border color of TextInput in React Native.

Prerequisites

• Familiarity with React Native and JavaScript
• A functional React Native setup

Basic TextInput Component

Firstly, let’s review how to add a simple TextInput component in your React Native application.

import React from 'react';
import { View, TextInput } from 'react-native';

const App = () => {
  return (
    <View>
      <TextInput placeholder="Enter text here" />
    </View>
  );
};

Static Border Color Change

You can set the initial border color using the style prop.

<TextInput
  placeholder="Enter text here"
  style={{ borderColor: 'blue', borderWidth: 1 }}
/>

The borderColor sets the color of the border. The borderWidth sets the width of the border.

Dynamic Focus Border Color

To change the border color when the TextInput is focused, you can use component state and event handlers.

import React, { useState } from 'react';
import { View, TextInput } from 'react-native';

const App = () => {
  const [isFocused, setFocused] = useState(false);

  return (
    <View>
      <TextInput
        placeholder="Enter text here"
        style={{
          borderColor: isFocused ? 'green' : 'blue',
          borderWidth: 1,
        }}
        onFocus={() => setFocused(true)}
        onBlur={() => setFocused(false)}
      />
    </View>
  );
};

export default App;

Explanation

• useState is used to manage whether the TextInput is focused.
• onFocus and onBlur event handlers change the state when the input is focused or blurred.
• The borderColor is conditionally set based on the isFocused state.

Changing the border color of a TextInput when focused is a great way to improve user feedback in React Native apps. By using component state and event handlers like onFocus and onBlur, you can provide a more interactive and responsive experience.