Single page web apps

A single-page application (SPA), also known as single-page interface (SPI), is a web application or web site that fits on a single web page with the goal of providing a more fluid user experience similar to a desktop application.

In SPA, either all necessary code – HTML, JavaScript, and CSS – is retrieved with a single page load, or the appropriate resources are dynamically loaded and added to the page as necessary, usually in response to user actions. The page does not reload at any point in the process, nor does control transfer to another page, although modern web technologies (such as those included in HTML5) can provide the perception and navigability of separate logical. Instead, content, functional buttons, and actions are implemented as Javascript actions that call as backend API and update both the rendered content and backup server state as the user engages with the application.

The inherent advantages of this are that once loaded and executing, a single page app typically feels much more responsive to user actions, needs less roundtrips to the backend Web server and gives the user an experience closer to that of a native mobile or desktop application.

Single page web applications provide a faster UI which is interactive and can be made Offline.

The potential for Single Page Apps arguably is that they can provide an experience very much analogous to native mobile and desktop apps anywhere where a web-browser with Javascript can be executed.

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