ReactJS Program to Accessible Error Messages with Explanation
ReactJS
Medium
Forms & Validation
22 views
1 min read
90 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around error, react, accessible. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Build a field that links error text using aria-describedby.
Input Format
No input.
Output Format
Render a React component.
Constraints
Give error element an id and attach it to input when error exists.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React, { useId, useState } from 'react';
export default function App() {
const [value, setValue] = useState('');
const [touched, setTouched] = useState(false);
const errId = useId();
const error = touched && value.trim().length < 3 ? 'Enter at least 3 characters' : '';
return (
<div style={{ padding: 16, width: 520 }}>
<h2 style={{ marginTop: 0 }}>meetcode accessibility</h2>
<label style={{ fontWeight: 700 }}>Display name</label>
<input
value={value}
onChange={(e) => setValue(e.target.value)}
onBlur={() => setTouched(true)}
aria-invalid={!!error}
aria-describedby={error ? errId : undefined}
style={{ marginTop: 6, width: '100%', padding: '10px 12px', borderRadius: 12, border: '1px solid ' + (error ? '#c1121f' : '#bbb') }}
/>
{error ? <div id={errId} style={{ marginTop: 8, color: '#c1121f' }}>{error}</div> : <div style={{ marginTop: 8, color: '#555' }}>Looks good.</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 field that links error text using aria-describedby.
Input / Output
Output
Render a React component.
Constraints
Give error element an id and attach it to input when error exists.
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, { useId, useState } from 'react';
export default function App() {
const [value, setValue] = useState('');
const [touched, setTouched] = useState(false);
const errId = useId();
const error = touched && value.trim().length < 3 ? 'Enter at least 3 characters' : '';
return (
<div style={{ padding: 16, width: 520 }}>
<h2 style={{ marginTop: 0 }}>meetcode accessibility</h2>
<label style={{ fontWeight: 700 }}>Display name</label>
<input
value={value}
onChange={(e) => setValue(e.target.value)}
onBlur={() => setTouched(true)}
aria-invalid={!!error}
aria-describedby={error ? errId : undefined}
style={{ marginTop: 6, width: '100%', padding: '10px 12px', borderRadius: 12, border: '1px solid ' + (error ? '#c1121f' : '#bbb') }}
/>
{error ? <div id={errId} style={{ marginTop: 8, color: '#c1121f' }}>{error}</div> : <div style={{ marginTop: 8, color: '#555' }}>Looks good.</div>}
</div>
);
}
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