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I don't understand what determines state of a promise object. What causes an object or function to have a state of "pending", while the $(".selector") to have state of "resolved".

Code as follows:

var obj = { prop: "value" };

var deferred = new $.Deferred();
var promiseObj1 = deferred.promise(obj);
var promiseObj2 = $(".selector").promise();

console.log(promiseObj1.state());    // "pending"
console.log(promiseObj2.state());    // "resolved"
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3
  • You need to call either reslove/reject to change the state of a promise Commented Dec 13, 2013 at 6:08
  • 1
    like promiseObj1.resolve() in the case of a selector there are no items in the fx queue by default it is resolved... Commented Dec 13, 2013 at 6:09
  • see jsfiddle.net/arunpjohny/9Qveq/2 Commented Dec 13, 2013 at 6:11

1 Answer 1

Reset to default
2

By default the state of a promise is pending when it is created. The state of a promise is changed when the deferred object which created the promise either resolves/rejects it.

var obj = { prop: "value" };

var deferred = new $.Deferred();
var promiseObj1 = deferred.promise(obj);
var promiseObj2 = $(".selector").promise();

console.log(promiseObj1.state());    // "pending"
console.log(promiseObj2.state());    // "resolved"

In the case of promiseObj1 you are creating a promise but the deferred object which created it is neither rejected/resolved that is the reason for the pending state

In the case of promiseObj2(it is a promise which will be resolved when all the actions queued in the fx queue of the matched elements are completed) since there are no animations in progress by default it is considered as resolved.

Demo: Fiddle

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