Form Validation - Lecture 25 2026

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  1. Click 'Get Form' to open it in the editor.
  2. Begin by reviewing the form fields. Ensure that all required fields, such as first name and age, are clearly marked.
  3. Enter your first name in the designated field. The form will prompt you if this field is left empty.
  4. Input your age, ensuring it falls within a reasonable range (1-120). An alert will notify you if the value is invalid.
  5. Select your state from the dropdown menu. If no selection is made, an alert will remind you to choose one.
  6. Once all fields are filled correctly, submit the form. The validation functions will check for errors before final submission.

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One of the best practices in form validation is to inform your users when they make an error so they can immediately verify and correct it before they take the next step.
A validation rule is a piece of functionality within a form that controls the information that users can submit under particular fields. For example, concerning the type, format, or content of a form response.
Input validation techniques fall into three categories: Server-side Validation. With server-side validation, all form information entered by the user is sent to the server to be validated upon form submittal. Client-side Validation. Real-time Validation.
Meaning of validation in English. the act or process of making something officially or legally acceptable or approved: Parking is free with validation of your ticket by one of the outlets in the mall. The system enables electronic validation of an applicants identity and certificates.
A validation rule is one way to restrict input in a table field or a control (such as a text box) on a form. Validation text lets you provide a message to help users who input data that is not valid.

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Form validation is the process of making sure that the data submitted through web forms is accurate, consistent, and conforms to specific rules and requirements that are predefined. If these requirements are not met, or the data is not correctly filled out, the form data will not be accepted or stored on the server.

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