Single-Page Applications (SPAs) are Web apps that heap an individual HTML page and progressively redesign that page as the user communicates with the app. It is also known as Single page application. Microsoft’s MSDN informed us that SPAs use AJAX and HTML5 to create fluid and responsive web apps, without constant page reloads.
On traditional websites, when visitors click on the links, these links generally lead to a new URL and load an entirely new page. In SPAs, the whole page doesn’t reload; instead, certain content is changed, loaded, and swapped out within the same page.
One of the best examples is Facebook : It is almost a SPA – most interactions don’t require loading a new webpage. One example where it still happens is clicking on “Photos” section in the left side menu. It does send your browser to a new URL. I believe facebook engineers are managed in the direction of excluding these counter-examples and delivering real SPA experience. Let’s have a look at the below example.
In above image, the page you can see is mainly the profile page of FB. Just note down the URL. On clicking any of the particular photos, the below image will appear.
In above image, we can see that URL is changed but page remains same which is actually a true example of SPA.
SPA Pros :
SPA Cons :
Advantages of a Single-Page Over Multi-Page Design :
Interpreted Mobile Development: You can reuse the same backend for web application and native mobile application.
Easy Navigation Path: There is no real way to get lost on a single page website since there is no other approach to get info like scrolling down the page.
Limited Amount of Bandwidth: Multi-page website takes a longer time to load. It still influences user experience. Single-page website needs limited amount of bandwidth than multi-page.
Enhanced Mobile-Friendliness: Single-page websites are much less demanding to transform into rapid loading responsive websites since it simply requires less time. No complicated navigation or extra bells and whistles make this task an easy thing. It takes a lot of efforts to build a mobile version of a multi-page website. Of course, responsive websites are not restricted in a number of pages.
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