This is not to say that the server-side validation is not important. A client-side validation includes checking the form-input data for the type or for the missing data.
Validating user-input data is one of the common tasks in any project. Validating user input using the built-in Validator
The framework provides APIs using which the various components, such as model, ViewModel, and data binding (that binds the markup to the ViewModel object) can be accomplished. In Kendo UI, the MVVM pattern is at the core of the application framework. There are several frameworks, such as KnockoutJS, KnockbackJS, and Kendo UI, that implement the MVVM pattern. On the other hand, the behavior of the application or the business logic is encapsulated in a layer called ViewModel. The View layer consumes the data provided by the model and formats it as required. The model layer represents raw data that needs to be formatted to be consumed by View. An example application will include the bank account number, the holder's name, the balance amount, and so on. Here, the model layer represents the domain-specific data. The Model View ViewModel ( MVVM) pattern is an architectural pattern, which is based on MVC and MVP. All three patterns mentioned previously try to separate the development of the user interface from the development of the business logic. Frameworks such as AngularJS, BackboneJS, and EmberJS provide components that can be readily used to build applications that follow one of these patterns. In recent years, these patterns have been applied to client-side applications as well. These patterns are heavily used in structuring both the desktop and server-side applications. In these templates, hash symbols are used to mark regions in the template that will be executed when the template is used to generate dynamic content. In Kendo UI, a microtemplating library is used, which is called hash templates. There are various types of client-side templating engines to choose from some of them are logic-less such as Mustache and Handlebars, some are based on the HAML syntax such as Jade, and some others are based on John Resig's micro templating such as underscore.js. Then, use templates to generate an HTML markup on the client side. The cart data can be sent to the client in the JSON format. Consider a shopping cart application, which lists the products in the cart. The time taken to send the records in the form of JSON data and not generate the markup on the server side takes away more CPU cycles, thereby improving the performance of the application to a great extent. This template can be served from Content Delivery Network ( CDN) instead of the same server that sends the dynamic data. In the client-side templating engine, the servers are responsible for sending only the dynamic data in the JSON format and then have the page assembled in the browser using a static client-side template.
However, this requires the server to generate such fragments as opposed to delivering complete web pages. This can be achieved by fetching the HTML fragment from the server and then inserting it into the document. The dynamic applications that are being built today require the user interface to be updated frequently. In recent years, generating the content on the client side (on the browser) has been embraced. Generating content at runtime used to be a server-side-only affair. Java Server Pages (Java), Smarty (PHP), and Django (Python) are examples of some of the server-side templating engines. The concept of using a templating system with some data source to generate a dynamic web content has been around web development for a long time. Using client-side templates to generate HTML markup from a JSON data
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