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New $.Deferred object with the old callbacks


New $.Deferred object with the old callbacks

By : user2953464
Date : November 21 2020, 01:01 AM
Hope that helps Promises represent a single value bound by time. You can't conceptually "reuse" a deferred or reset it - once it transitions it sticks. There are constructs that generalize promises to multiple values (like observables) but those are more complicated in this case - it's probably better to just use one deferred per request.
jQuery's AJAX already provides a promise interface. Your code is mostly redundant - you can and should consider using the existent tooling.
code :
$("button").click(function(){
    var first = $.get("/");
    var second = first.then(function(){
       return $.get("/asd");
    });
    var third = second.then(function(){
       return $.get("/qqq");
    });
});


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How do you attach callbacks to the deferred object that is attached to a deferred object?

How do you attach callbacks to the deferred object that is attached to a deferred object?


By : Eshcole HeadphonesOn
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further We were fortunate and had some flexibility in the timeline. We ended up using the .pipe() chaining added to deferred objects in jQuery 1.6.
to everyone for their help!
Deferred's then and other callbacks or errbacks

Deferred's then and other callbacks or errbacks


By : Dmitry Komrakov
Date : March 29 2020, 07:55 AM
hope this fix your issue I have put together a short example to manifest the FIFO principle: http://jsfiddle.net/phusick/CHQ8d/
The latest documentation: http://livedocs.dojotoolkit.org/dojo/Deferred
jQuery Deferred - Add callbacks to the Deferred contract at runtime

jQuery Deferred - Add callbacks to the Deferred contract at runtime


By : Brian Schau
Date : March 29 2020, 07:55 AM
With these it helps It's not that much more complicated. If you want to execute all level 2 calls in parallel, just call $.when inside the .pipe callback and return that deferred object:
code :
$.when(
    $.ajax({        
        // ...      
    }).pipe(function(data) {
        // concise way to make the Ajax calls for each value
        var deferreds = $.map(data, function(value) {
            return $.ajax({data: value, /*...*/});
        });
        return $.when.apply($, deferreds);
    }),
    $.ajax({        
        // ...       
    })
).done(function(){ console.log('All done!'); });
$.when(
    $.ajax({        
        // ...      
    }).pipe(function(data) {
        // A "dummy" resolved deferred object 
        var deferred = (new $.Deferred()).resolve();
        $.each(data, function(value) {
            deferred = deferred.pipe(function() {
                return $.ajax({data: value, /*...*/});
            });
        });
        return deferred;
    }),
    $.ajax({        
        // ...       
    })
).done(function(){ console.log('All done!'); });
Are jquery deferred callbacks synchronous if the deferred is already resolved?

Are jquery deferred callbacks synchronous if the deferred is already resolved?


By : Bruce Johnson
Date : March 29 2020, 07:55 AM
I wish did fix the issue. If the promise is already resolved / rejected, the new callbacks are executed synchronously.
From the jQuery.deferred() doc:
code :
var def = jQuery.Deferred(),
    promise = def.promise();
console.log('before 1');
promise.done(function () {
    console.log('done 1');
});
console.log('after 1');
def.resolve();
console.log('before 2');
promise.done(function () {
    console.log('done 2');
});
console.log('after 2');
JQuery: Deferred vs Callbacks

JQuery: Deferred vs Callbacks


By : Hamad Mahmood Khan
Date : March 29 2020, 07:55 AM
hope this fix your issue They do not do very similar things. $.Callbacks is used as a container of callback functions, for example, lets say you have to code a function that receives 10 callbacks (either as an array of callbacks or each one as a parameter), you would have to loop the array of callbacks and fire each one of them, or write 10 lines of code (one for each callback parameter), now, having $.Callbacks, you can pass that object to the function (having previously pushed your 10 callbacks to it by using the add method) and then simply call callbacks.fire() and all callbacks will be fired.
Example without $.Callbacks and parameters:
code :
function doSomethingAndThenFireManyCallbacks(cb1, cb2, cb3, cb4, cb5, cb6) {
    //do something.

    cb1();
    cb2();
    cb3();
    cb4();
    cb5();
    cb6();
}

doSomethingAndThenFireManyCallbacks(fn1, fn2, fn3, fn4, fn5, fn6);
function doSomethingAndThenFireManyCallbacks(callbacks) {
    //do something.

    for (var i = 0; i < callbacks.length; i++) {
        callbacks[i]();
    }
}

doSomethingAndThenFireManyCallbacks(fn1, fn2, fn3, fn4, fn5, fn6);
function doSomethingAndThenFireManyCallbacks(callbacks) {
    //do something.

    callbacks.fire();
}

var callbacks = $.Callbacks();
callbacks.add([fn1, fn2, fn3, fn4, fn5, fn6]);
doSomethingAndThenFireManyCallbacks(callbacks);
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