Book Image

Learning ASP.NET Core MVC Programming

By : Mugilan T. S. Ragupathi, Anuraj Parameswaran
Book Image

Learning ASP.NET Core MVC Programming

By: Mugilan T. S. Ragupathi, Anuraj Parameswaran

Overview of this book

ASP.NET Core MVC helps you build robust web applications using the Model-View-Controller design. This guide will help you in building applications which can be deployed on non-windows platforms such as Linux. In today’s age, it is crucial that you possess the ability to separate the programming and business logic, and this is exactly what ASP.NET Core MVC application will help you achieve. This version comes with a number of improvements that enable fast, TDD-friendly development to create sophisticated applications. You would also learn the fundamentals of Entity framework and on how to use the same in ASP.NET Core web applications. The book presents the fundamentals and philosophies of ASP.NET Core. Starting with an overview of the MVC pattern, we quickly dive into the aspects that you need to know to get started with ASP.NET. You will learn about the core architecture of model, view, and control. Integrating your application with Bootstrap, validating user input, interacting with databases, and deploying your application are some of the things that you will be able to execute with this fast-paced guide. The end of the book will test your knowledge as you build a fully working sample application using the skills you’ve learned throughout the book.
Table of Contents (18 chapters)
Learning ASP.NET Core MVC Programming
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
10
Building HTTP-based Web Services Using ASP.NET Web API

Client-side validation


There are scenarios where we don't need to go to the server to validate the input data. In the preceding example of the server-side validation, we do not need to go to the server to verify whether the user has entered the data for the Name field. We can validate at the client-side itself. This prevents round-trips to the server and reduces the server load.

We are going to use JavaScript to validate the data from the client-side. JavaScript is a high-level, interpreted language which is primarily used in client-side programming.

Note

These days, JavaScript is also being used at the server-side as part of Node.js.

We are going to make a couple of changes in our View model (Index.cshtml file) to validate the form at the client-side:

  1. Changes in the form: add the id attribute to all the span tags so that we can access this HTML element to display the HTML error message. On submission of the form, call a JavaScript function to validate the input data.

  2. Add the script HTML element...