ReactJS Program to Controlled Input Component with Explanation
ReactJS
Easy
Forms & Validation
27 views
1 min read
83 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around controlled, component, react. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Build a controlled text input that shows the typed value below.
Input Format
No input.
Output Format
Render a React component.
Constraints
Use useState and onChange.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React, { useState } from 'react';
export default function App() {
const [value, setValue] = useState('');
return (
<div style={{ padding: 16 }}>
<label>
Search meetcode
<div>
<input value={value} onChange={(e) => setValue(e.target.value)} style={{ padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb', width: 320 }} />
</div>
</label>
<p style={{ marginTop: 10, color: '#555' }}>You typed: {value || '...'}</p>
</div>
);
}
Output Example
No sample I/O is provided for this question.
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Build a controlled text input that shows the typed value below.
Input / Output
Output
Render a React component.
Constraints
Use useState and onChange.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
import React, { useState } from 'react';
export default function App() {
const [value, setValue] = useState('');
return (
<div style={{ padding: 16 }}>
<label>
Search meetcode
<div>
<input value={value} onChange={(e) => setValue(e.target.value)} style={{ padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb', width: 320 }} />
</div>
</label>
<p style={{ marginTop: 10, color: '#555' }}>You typed: {value || '...'}</p>
</div>
);
}
Solutions (0)
No solutions submitted yet. Be the first!
