Prevent adding typed keys into controlled TextInput in React Native:

In React Native, you can prevent adding typed keys into a controlled TextInput component by handling the onChangeText event and updating the state with only the desired values. Here's an example:

import { TextInput } from 'react-native';

    // Perform your validation or filtering logic here

    const filteredInput = input.replace(/[^a-zA-Z]/g, ''); // Example: Allow only alphabets

    // Update the state with the filtered input

In this example, the onChangeText event handler is responsible for validating or filtering the input text. In this case, the code uses a regular expression to replace any non-alphabet characters with an empty string, effectively allowing only alphabets to be entered into the TextInput.

By updating the state with the filtered input (setText(filteredInput)), the component will re-render, and the filtered input value will be displayed in the TextInput. Any invalid or unwanted characters entered by the user will be automatically removed.

Here is the another way to prevent adding typed keys into a controlled TextInput in React Native by using the onKeyPress event and preventing the default behavior when certain keys are pressed. Here's an example:

    // Prevent adding typed keys based on your condition

      event.preventDefault(); // Prevent adding the key 'a' or 'A'

In this example, the onKeyPress event handler is responsible for preventing the default behavior when certain keys are pressed. In this case, it checks if the pressed key is 'a' or 'A' and calls event.preventDefault() to prevent adding those keys to the TextInput.

By attaching the onKeyPress event handler to the TextInput component (onKeyPress={onKeyPress}), you can control which keys are allowed or prevented from being added to the input. You can modify the condition in the onKeyPress function to suit your specific requirements.

In conclusion, controlling the input in a TextInput component in React Native allows you to prevent the addition of unwanted keys. By using events like onChangeText or onKeyPress, you can validate and filter the input to ensure only desired characters are added, enhancing the user experience.

Prevent unwanted keys in controlled TextInput in React Native using onChangeText or onKeyPress events for input validation.

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