React.js code to prevent the user from typing only in Arabic
To prevent a user from typing only in Arabic in a React.js application, you can create a controlled input component that validates the input and restricts it based on your requirements. Below is an example of how to implement this.

### Example Code

```jsx
import React, { useState } from 'react';

const ArabicInput = () => {
    const [inputValue, setInputValue] = useState('');

    const handleChange = (event) => {
        const value = event.target.value;

        // Regular expression to check if the string contains only Arabic characters
        const arabicRegex = /^[\u0600-\u06FF\s]+$/;

        // Check if the new value is Arabic only
        if (!arabicRegex.test(value) || value.trim() === '') {
            setInputValue(value);
        } else {
            // Optionally, you can alert the user or show a message
            alert('Input cannot be only in Arabic!');
        }
    };

    return (
        <div>
            <label htmlFor="input">Enter text:</label>
            <input
                id="input"
                type="text"
                value={inputValue}
                onChange={handleChange}
                placeholder="Type here..."
            />
        </div>
    );
};

export default ArabicInput;
```

### Explanation

1. **State Management**: We use the `useState` hook to manage the input value.
  
2. **Input Handling
An interesting requirement!

To prevent the user from typing only in Arabic in a React.js application, you can use a combination of JavaScript and regular expressions. Here's an example code snippet that should help you achieve this:
```jsx
import React, { useState } from'react';

function MyInputField() {
  const [inputValue, setInputValue] = useState('');

  const handleInputChange = (e) => {
    const arabicRegex = /[\u0600-\u06FF\u0750-\u077F\u08A0-\u08FF\uFB50-\uFDCF\uFDF0-\uFDFF\uFE70-\uFEFF]/;
    const inputValue = e.target.value;

    if (arabicRegex.test(inputValue) &&!/[a-zA-Z0-9]/.test(inputValue)) {
      e.preventDefault();
      return;
    }

    setInputValue(inputValue);
  };

  return (
    <input
      type="text"
      value={inputValue}
      onChange={handleInputChange}
      placeholder="Enter text (not only Arabic)"
    />
  );
}
```
Let's break down the code:

* We define a regular expression `arabicRegex` that matches Arabic characters ( Unicode range U+0600 to U+06FF, U+0750 to U+077F, U+08A0 to U+08FF, U+FB50 to U+FDCF, U+FDF0 to