Form Validation
-
This lesson teaches how to perform form validation in React to ensure users provide correct and complete input.
Form validation ensures that the user enters correct and complete data.
Types of validation:
Required fields
Email format
Password length
Basic Form Validation
Example:
if (name === "") {
alert("Name is required");
}
- Simple Validation in JSX:
{!name && <p>Name is required</p>}Validation prevents incorrect form submission.
Handling Form Submission
Form submission is handled using the onSubmit event.
Example:
function handleSubmit(e) {
e.preventDefault();
console.log(name);
}
<form onSubmit={handleSubmit}>
<button type="submit">Submit</button>
</form>
preventDefault() stops page reload.
Final Summary
Forms collect user data
React uses controlled components
Input changes update state
Validation improves data quality