jqueryHow do I use the jQuery when function?

The jQuery when() function is used to execute callback functions based on one or more objects, usually Deferred objects that represent asynchronous events. It is often used when handling multiple asynchronous operations, such as making multiple Ajax requests.

Example

$.when(
    $.ajax("/page1.php"),
    $.ajax("/page2.php")
).done(function(page1, page2) {
    // Both requests are done
    console.log(page1, page2);
});

Output example

<html>...</html> <html>...</html>

The when() function takes one or more Deferred objects as arguments. When all the Deferred objects are resolved, the done() callback is executed. The callback is passed the resolved values of all the Deferred objects as arguments.

List of Code Parts

$.when() - This is the jQuery when() function, which takes one or more Deferred objects as arguments.
$.ajax() - This is the jQuery ajax() function, which is used to make an asynchronous request.
done() - This is the done() callback, which is executed when all the Deferred objects are resolved.

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