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Deferred and promise in jQuery
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There was a problem with saving your item s for later. With this, you can add as many listener functions as you want. Now we have a similar problem with Ajax calls.
Since version 1. The advantage is that these are not jQuery specific. For example, if you work with Node. You can combine the done and fail functions in one then function. The code above can be rewritten as:.
Maybe you have a callback function that stops an animation, one that does a new Ajax call and another function that shows the received data to the visitor. So no messing around with variables holding different states.
Learning jQuery Deferreds: Taming Callback Hell with Deferreds and Promises by Terry Jones
When a Ajax call has finished, it will end up in either the success state or the failed state and this state will not change. Sometimes you need to do two simultaneous Ajax calls and you want to execute a function when both are successfully finished.
In the code below, first promise1 is run and when resolved successfully, getStuff is run, returning a promise and when this is resolved successfully, the anonymous function is executed. Every callback function receives the result of the previous asynchronous function, in the case of Ajax, that would be the returned data. So what is a deferred and what is the difference with a promise?
As you have seen above, a promise is an object that is returned from an asynchronous function.
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You need a deferred when you write such a function yourself. A deferred object can do the same as a promise object, but it has two functions to trigger the done and fail functions. This type is approving a mining P to double-check itself from disabled lands. The Page you perfectly sent sent the server video.
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The Callback Pattern
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