Ideally, users will fill the web form with necessary information and finish their job successfully. In this article we will go beyond the validation itself and explore different validation and error feedback techniques, methods and approaches. The goal of web form validation is to ensure that the user provided necessary and properly formatted information needed to successfully complete an operation.By decorating your field elements with the correct attributes, angular validation will occur automatically and let you know when a field (and in turn the form) is valid or invalid.In addition you can use some conditional css classes to highlight invalid fields to the user.
Thus we have server-side and client-side validation. In the server-side validation, information is being sent to the server and validated using one of server-side languages.
In this tutorial I will: Per the spec how errors are presented to the user is left up to the browser itself.
However, the spec does provide a full DOM API, new HTML attributes, and CSS hooks authors can use to customize the experience.
Before HTML5 there was no means of implementing validation natively; therefore, developers have resorted to a variety of Java Script based solutions.
To help ease the burden on developers, HTML5 introduced a concept known as constraint validation - a native means of implementing client side validation on web forms.