Web Design and Development Grade 11 Data validation for HTML amharic vidio

Data validation is the process of checking whether the data entered into a system is correct, complete, and in the proper format before it is processed or stored.

Simple Definition:

👉 Data validation ensures that input data is accurate and acceptable.

Example:

Email must include @ (e.g., user@gmail.com)

Age must be a number, not text

Required fields should not be empty

Types of Data Validation:

Required validation – field cannot be empty

Type validation – correct data type (number, text, email)

Length validation – limits number of characters

Range validation – value must be within a range (e.g., 1–100)

Format validation – follows a pattern (email, phone)

In Web Development:

Data validation can be done using:

HTML (required, pattern, type)

JavaScript (client-side validation)

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