Can you explain the concept of Asynchronous in Ajax? Additionally, how does Ajax determine when to retrieve data without constantly polling the server?
Can you explain the concept of Asynchronous in Ajax? Additionally, how does Ajax determine when to retrieve data without constantly polling the server?
When a script is asynchronous, it will send a request to the server and then continue running without pausing for the response. Once the response is received, a browser event is triggered, allowing the script to carry out its designated actions.
Ajax is able to fetch data from the server at specific times because you instruct it when to do so.
Essentially, the concept is similar to its function in various other scenarios. In the case of making an ajax call, it does not wait for a response before proceeding.
Web browsers lack access to a threading model, resulting in a single thread being responsible for handling the User Interface. This means that all modifications made to the application occur within this same thread.
Thankfully, browsers offer various asynchronous APIs, such as XHR (XMLHttpRequest), commonly referred to as AJAX. By setting event handlers for objects, actions related to these objects can be executed in separate threads, with the browser subsequently triggering events in the main thread.
This asynchronous approach signifies that the browser does not need to wait for the main thread to become available before performing actions.
Asynchronous processing in Ajax involves handling incoming requests by queuing them up in a continuous event stack and transmitting small requests consecutively without pausing for responses. Essentially, asynchronous ajax calls enable subsequent lines of code to run while synchronous calls halt JavaScript execution until a server response is received.
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