JavaScript Applications & Use-case

1. Single Page Applications(SPAs)

It is sometimes referred to as Single Page Interface (SPI). This is the most common form of JavaScript application available these days. These are a lot more responsive and resemble a desktop application. Unlike other web applications, these load the complete webpage with HTML, CSS, and JavaScript initially. Though the initial loading of the webpage takes time, it works faster with other user requests. The only disadvantage these applications have is that they rely heavily on JavaScript and thus reduce browsing speed in low-power devices. Some examples of SPAs are Gmail, Facebook, Twitter, etc.

2. Multi-page Applications

These applications work in a “traditional” way. This means that every change in the web application requests a new page from the server. They are larger than SPAs and take more time than necessary. We have to transfer a lot of data between the server and the browser which reduces the application’s speed. Even though it is much easier these days to do that with the help of AJAX (Asynchronous JavaScript), it isn’t very popular. AJAX allows us to refresh only certain sections of the applications without reloading the complete application. But using these applications adds complexity for the programmer and these are difficult to develop as compared to the SPAs.

3. Isomorphic (Universal) Applications

JavaScript applications became ‘Isomorphic’ with the release of NodeJS i.e. they can execute on both client-side and server-side. These applications are very useful when you need faster interaction with the web pages. The same code must be compatible to execute on both the client-side and server-side to render the application components. Unlike SPAs, these applications support older devices and work even with poor internet connections. These applications have a lesser code, but this also makes them difficult to debug.

JavaScript Architecture

1. Typical JavaScript Application Architecture

This JavaScript architecture works fine for simple programs, but in the long run, it fails to meet the demands of complex programs. You can use it for most of the websites where you don’t add special frameworks. This architecture is perfectly fine if you want to interact with the application screen, though you might face some trouble in a large-scale application. Hence, it is crucial that you research this architecture before investment and implementation.

2. Framework-based Typical JavaScript Architecture

As the demand for a complex architecture of JavaScript arose, Framework-Based Architecture came into use. Even though the main focus is still the UI screen, it is much more advanced than the previous version. It involves detailing the simplistic view of the JavaScript Application Architecture. It is very effective for solving complex problems as it implements either MVC or MVVM patterns to the application. Business and presentation concerns are separate, making it easier to work with.

Industry using JavaScript:

JavaScript comes under the most important one:

How PayPal uses JavaScript:

PayPal is one of the largest online payment processors in the world. Sign Up Now! Secure all your Transactions with our 24x7 Fraud Prevention. Sign Up Now! No Top Up Needed. 180-days Buyer Protection. 24/7 Fraud Prevention. Faster Checkout. Website Payments.

The PayPal JavaScript SDK dynamically exposes objects and methods, based on components you are using. These components are configured in the query string parameter in the URL you have included in the .

For example:

  • (default)

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