How to use Html5 form validation

Introduction

Many websites and browsers have in-built form validation features. Form validation is a process of checking the form that has been filled accurately before it is processed. There are two methods of form validation namely server-side and client-side. Form validation in html5 is a feature which is supported by all current browsers. In practice there are three main categories of html5 form validation features such as HTML attributes on <select>, <textarea>, and <input> elements, CSS pseudo-selectors and JavaScript API’s. This article leads you through the basic concepts about the usage of html5 form validation. The articles include frequently asked html5 form validation interview questions.

HTML forms

Html forms are required when the user wants to collect some data (registration information: name, email address, credit card, etc.) from the visitor on the site. Html forms are incorporated with a number of elements such as text area fields, drop-down menus, radio buttons, check boxes which are used to take information from the users.

Basics of html5 form validation

Html attributes are the key elements that are required for the validation of the form. Required is an attribute to a <input> which is used to ensure users fill email address box. In order to only access the email address, we set the input type=” email” which will automatically render text box and only allow the user to fill email addresses.

Client-side validation

Client-side validation is a validation that automatically occurs in the browser before data has been submitted to the server. Client-side validation is user-friendly and understandable as compared to server-side validation because it gives an instant response. Additionally, client-side validation is divided into two categories namely JavaScript and build-in form validation.

Html 5 form Validation

Form validation is very important on both server-side and client-side, as it helps legitimate users to avoid and correct mistakes. It also restricts malicious users to submit data that could cause serious damage to the application. In order to control the form validation, users need name attributes, without name attribute users would not submit their forms.

Conclusion

This article provides the best interview questions regarding html5 form validation. The users can strengthen their knowledge regarding html5 form validation as it is used in browser extensions, Greasemonkey scripts, prototyping, etc.