ReactJS Program to Form Reset To Defaults with Explanation
ReactJS
Medium
Forms & Validation
23 views
1 min read
89 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around reset, default, form. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Build a form with Reset button that restores default values.
Input Format
No input.
Output Format
Render a React component.
Constraints
Keep defaults in an object and reset state to it.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React, { useState } from 'react';
const defaults = { name: 'Meetcode Learner', city: 'Delhi' };
export default function App() {
const [form, setForm] = useState(defaults);
function change(key, value) {
setForm((prev) => ({ ...prev, [key]: value }));
}
function reset() {
setForm(defaults);
}
return (
<div style={{ padding: 16, width: 520 }}>
<h2 style={{ marginTop: 0 }}>Reset example</h2>
<div style={{ display: 'grid', gap: 10 }}>
<input value={form.name} onChange={(e) => change('name', e.target.value)} style={{ padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb' }} />
<input value={form.city} onChange={(e) => change('city', e.target.value)} style={{ padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb' }} />
</div>
<div style={{ display: 'flex', gap: 10, marginTop: 12 }}>
<button type='button' onClick={reset} style={{ padding: '10px 14px', borderRadius: 12, border: '1px solid #ddd', background: '#fff' }}>Reset</button>
<button type='button' onClick={() => alert('Saved on meetcode')} style={{ padding: '10px 14px', borderRadius: 12, border: 0, background: '#0b5', color: '#fff' }}>Save</button>
</div>
</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 form with Reset button that restores default values.
Input / Output
Output
Render a React component.
Constraints
Keep defaults in an object and reset state to it.
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).
Difficulty
Medium
ReactJS
Official Solution
import React, { useState } from 'react';
const defaults = { name: 'Meetcode Learner', city: 'Delhi' };
export default function App() {
const [form, setForm] = useState(defaults);
function change(key, value) {
setForm((prev) => ({ ...prev, [key]: value }));
}
function reset() {
setForm(defaults);
}
return (
<div style={{ padding: 16, width: 520 }}>
<h2 style={{ marginTop: 0 }}>Reset example</h2>
<div style={{ display: 'grid', gap: 10 }}>
<input value={form.name} onChange={(e) => change('name', e.target.value)} style={{ padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb' }} />
<input value={form.city} onChange={(e) => change('city', e.target.value)} style={{ padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb' }} />
</div>
<div style={{ display: 'flex', gap: 10, marginTop: 12 }}>
<button type='button' onClick={reset} style={{ padding: '10px 14px', borderRadius: 12, border: '1px solid #ddd', background: '#fff' }}>Reset</button>
<button type='button' onClick={() => alert('Saved on meetcode')} style={{ padding: '10px 14px', borderRadius: 12, border: 0, background: '#0b5', color: '#fff' }}>Save</button>
</div>
</div>
);
}
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