Definition:
The acronym of Ajax stands for Asynchronous JavaScript and XML, or Javascript and XML Asynchronous. Ajax is a programming language that allows the updating of specific sections of content on a web page, without the need to completely reload the page.
The term Ajax was first used by Jesse James Garret in 2005, in his publication “Ajax: a New Approach to Web Applications”.
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Ajax Applications
With Ajax, web applications can send data from a server and retrieve it asynchronously (loading from the background), without interfering with the display and behavior of the existing page. By decoupling the data exchange layer from the presentation layer, Ajax allows web pages, and by extension web applications, to dynamically change content without needing to reload the entire page. Data can be retrieved using the “XMLHttpRequest” object. Despite the name, xml is not required (JSON is often used in the AJAJ variant), and requests do not have to be asynchronous.
Ajax is not a technology, but a group of technologies. HTML and CSS can be used in combination with it. JavaScript and the “XMLHttpRequest” object provide a method for asynchronously exchanging data between the browser and the server to avoid loading the page completely.
Frequently asked questions about Ajax
What is Ajax?
Ajax is a web development technique that allows data to be loaded or sent without reloading the entire page. It uses JavaScript and requests to the server to update specific parts of an interface, making the experience faster and more dynamic.
What is Ajax used for on a website?
It is used to create more fluid interactions, such as filters, internal search engines, forms, product loading, autocompletes or dynamic panels. Applied well, it reduces waiting and avoids full reloads when only part of the content changes.
What relationship does Ajax have with SEO?
Ajax can affect SEO if important content only appears after executing JavaScript and is not accessible to search engines or users without scripts. Therefore it is advisable to ensure correct rendering, crawlable URLs and essential content available in a stable way.
What errors are common when using Ajax?
Loading key content without its own URLs, breaking browser history, making crawling difficult, not showing loading states or not managing errors are common. It can also harm accessibility if dynamic changes are not correctly communicated to the user.