Knockout.js is a basic JavaScript framework for creating online applications. It is a JavaScript library for binding HTML elements to any data model. It is generally used to create rich and responsive displays, as well as editing user interfaces, based on a clean data model. Knockout.js is compatible with all types of client-side and server-side technologies. Many popular websites are developed with Knockout.js. Some of these include thetrainline.com, Pillsbury, eventim, and DAVINCI.

Knockout.js is an MVVM framework.

Knockout.js supports the MVVM (Model - View - Viewmodel) application design paradigm. Let's look at the definitions of these terminologies.

A model represents data or information. It saves information but not the behaviors or services that manipulate it.  It is accomplished through the use of View and View Model, which are coupled together via a two-way data binding method.

A View is an accurate representation of the data for the end user. A view is an HTML template that has Knockout bindings. The view displays and edits data through the use of data-bind properties. It includes HTML elements like buttons, photos, grids, links, and more.

A View Model serves as a mediator between the Model and the View. Knockout.js is a JavaScript representation of the model data and the functions used to manipulate it.

Built-in Templating

Knockout.js supports DOM-based templating and, by default, employs HTML as the template engine. However, it also allows string-based templating. Templating enables apps to create modular and reusable views. Knockout.js supports DOM or string-based templating for modularizing views and programmatically rendering them.

Knockout.js also allows you to create templates that render HTML for a single element or a whole array. This makes code organization very clean.

Declarative Binding

Client-side JavaScript development with business applications and REST services frequently entails creating client-side HTML to present data to end users. Most JavaScript developers use jQuery on the client side to generate HTML. This frequently leads to the creation of lengthy, complex code.

Knockout.js is useful because it lets you include data binding expressions in your HTML. It allows you to associate DOM elements with model data using a simple syntax. Knockout.js is a data-binding library that enables you to define custom bindings within data-bind. Furthermore, it supports declarative binding, which allows you to tie sections of your user interface to your data model.

Conclusion

Knockout.js is unique in that it binds to a single DOM container, rather than the entire HTML content. Knockout.js is a powerful tool for managing DOM transformations. Knockout.js is sometimes criticized for being unsuitable for larger applications, yet this is a highly controversial point.

Knockout.js is a popular choice among developers for its strong JavaScript web framework. If you are a Knockout.js developer or a web developer with previous experience using Knockout.js, you may provide some more knowledge about how to use Knockout.js more efficiently in various scenarios.