Ajax and jQuery

Ajax and jQuery are an example of unifying efficiency technologies and web programming development.

Ajax enables websites to send direct requests to web servers and opening a new page isn’t necessary. A simple example where Ajax plays an essential role is the log in form. When you want to log in, the username and password are matched to the ones in the database. Without Ajax, the process would be complicated, but now it is simple and there isn’t a need to open a new page which checks the requests. When Ajax is used, web applications can send and receive data asynchronously. The two necessary parameters (the username and the password) are sent through JavaScript which calls Ajax. Next, the webserver takes this data and sends a request to the database to check if it exists. The server sends back a message to notify us whether it is successful or if there is an error. After that, if the answer is affirmative, windows.location is used to refer the user to his/her panel. In order to achieve this, the JavaScript function receives Ajax’s response. The advantage of Ajax is that the whole page does not have to be loaded when verifying the user and this is how we save time and enable efficiency.

Problems with Ajax appear when different requests are used in the same application (for example synchronized and asynchronized) or in case of different formats of responses (HTML, CSV, VML, JSON, etc). Ajax is based on sending requests to the webserver. Subsequently, it waits for a response and updates the page. This is achieved through functions such as HttpRequest()and by taking two parameters (the URL address and function response) which can be used multiple times in the whole application.

The advantage of jQuery is that it has Ajax functions and methods which can be used to speed up the project development.

JQuery is a JavaScript library that makes it easier to manipulate DOM objects, events, effects, and Ajax, and it takes care of JavaScript memory/resource leakage and a lot of additions.

jQuery has the ability to use the Ajax call. It communicates with Ajax through a simple API and it also controls URLS, caches, success functions, different types of data, and even synchronization.