CODEWITHSUNDEEP
jqueryajaxeventspromisejquery-events
Gerardo Lima
Gerardo Lima

Reputation: 6703

Deferred implementation for jQuery Ajax global handlers

According to jQuery documentation, the global Ajax event handlers must be implemented using callback functions on the document. Otherwise, local $.ajax() implement events using promises.

Is there any way of handling the global Ajax events using promises method, as .done(), .fail(), .always() and .then() ?

I'm looking for a way for declaring event handlers for global ajax events that do not depend on $(document), for example:

// current way of doing this:
// $(document).ajaxSuccess(_handleAjaxSuccess);
// 
// some ideas of what it could look like:
// $.ajaxSuccess(_handleAjaxSuccess);
// $.ajax.done(_handleAjaxSuccess);
// $.ajaxSetup({ done: _handleAjaxSuccess });

Upvotes: 0

Views: 143

Answers (2)

Gerardo Lima
Gerardo Lima

Reputation: 6703

Although the promises interface is supported on jqXHR instances, it is not supported on global Ajax events on jquery and currently there's no plan to implementing it (jquery forum).

Upvotes: 0

Roamer-1888
Roamer-1888

Reputation: 19288

No, you cannot handle the global Ajax events using promises method .done(), .fail(), .always() and .then().

Those are Promise methods, therefore a Promise needs to exist before before they become available.

By definition, jQuery's global ajax event handlers are not attached to any particular Promise at the point where they are defined. Instead, they are stored by jQuery and invoked internally whenever certain ajax events occur.

As users of jQuery, we don't need to worry about how those internal invocations are made but we can be pretty sure that one or other of the methods .done(), .fail(), .always() and .then() is involved.

If you want to know more, you can delve into the jQuery source, however I doubt that the extra understanding would be particularly valuable.

Upvotes: 1

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