angular-extend-promises
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Have you ever dreamed of using Angular's promises like Bluebird's? With methods like map, join, filter, tap, …?
Now you can!
This library uses lodash as a dependency. Two versions are shipped:
window._. This is your best choice if you already use lodash in your project)With Bower:
bower install angular-extend-promises
With NPM:
npm install angular-extend-promises
<!-- if you already included lodash -->
<script src="bower_components/angular-extend-promises/angular-extend-promises-without-lodash.min.js" type="text/javascript"></script>
<!-- if you don't -->
<script src="bower_components/angular-extend-promises/angular-extend-promises.min.js" type="text/javascript"></script>
Replace bower_components by node_modules if necessary.
angular.module('my-project', [
// [...]
'angular-extend-promises'
])
And that's all! Angular's $q now contains all your favorite helpers!
On $q:
$q.defer()$q.join(Promise|Thenable|value promises…, Function handler)$q.method(Function method)$q.reject(dynamic reason)$q.resolve(dynamic value)$q.try(Function fn [, Array<dynamic>|dynamic argument] [, dynamic ctx])$q.when(dynamic value)On promises:
.bind(dynamic thisArg).catch(Function handler).finally(Function handler).spread([Function fulfilledHandler] [, Function rejectedHandler ]).then([Function fulfilledHandler] [, Function rejectedHandler ])On $q and on promises:
.all().any().each(Function iterator).filter(Function filterer [, Object options]).map(Function mapper [, Object options]).props().reduce(Function reducer [, dynamic initialValue]).settle() not implemented yet.some(int count)On promises:
.call(String propertyName [, dynamic arg...]).get(String propertyName).return(dynamic value).tap(Function handler).throw(dynamic reason)On promises
On promises:
On promises:
IE8 doesn't handle keywords as properties or method's names, so using .catch() will throw "SCRIPT1010: Expected identifier" for example.
You can use aliases in order not to use the ugly ['catch'](err) syntax.
$q.attempt -> $q.try.caught -> .catch.lastly -> .finally.thenReturn and .returns -> .return.thenThrow -> .throwYou can configure this behavior during the initialization of your app:
.config(['angularExtendPromisesProvider', function (angularExtendPromisesProvider) {
angularExtendPromisesProvider.options.compatibilityAliases = false;
angularExtendPromisesProvider.options.disableES5Methods = true;
}])
The option compatibilityAliases is true by default.
You may want to disable aliases if your target browsers are ≥ IE9 (you don't need them).
The option disableES5Methods is false by default.
When true, it disables .catch(), .finally(), .try(), .return() and .throw().
This is a good way to prevent other contributors to use these methods when your app must run on IE ≤ 8.
Example:
function thatReturnsAPromise() {
var def = $q.defer();
try {
doAsyncStuff(function callback(result) {
if (result.err)
return def.reject(result.err);
return def.resolve(result);
});
}
catch (err) {
def.reject(result.err);
}
return def.promise;
}
More documentation on Angular's project
Example:
$q.join(getPictures(), getComments(), getTweets(),
function(pictures, comments, tweets) {
console.log('in total: ' + pictures.length + comments.length + tweets.length);
}
);
More documentation on Bluebird's project
Example:
MyClass.prototype.method = Promise.method(function(input) {
if (!this.isValid(input))
throw new TypeError('input is not valid');
if (this.cachedFor(input))
return this.someCachedValue;
return db.queryAsync(input).bind(this)
.then(function(value) {
this.someCachedValue = value;
return value;
})
;
});
More documentation on Bluebird's project
Example:
$q.reject('Just because.')
.catch(function(theReason) {
console.error(theReason);
})
;
More documentation on Angular's project
Example:
$q.resolve(value)
.then(function(resolvedValue) {
console.log(resolvedValue);
})
;
More documentation on Bluebird's project
Example:
function getUserById(id) {
return $q.try(function() {
if (!_.isNumber(id)) {
throw new Error('id must be a number');
}
return db.getUserById(id);
});
}
Alias: $q.attempt
More documentation on Bluebird's project
Example:
$q.when(somethingPossiblyAPromise)
.then(function(resolvedValue) {
console.log(resolvedValue);
})
;
More documentation on Angular's project
Example:
somethingAsync().bind({})
.spread(function (a, b) {
this.a = a;
this.b = b;
return somethingElseAsync(a, b);
})
.then(function (c) {
return this.a + this.b + c;
});
More documentation on Bluebird's project
Example:
somePromise
.then(function() {
return a.b.c.d();
})
.catch(TypeError, function(e) {
// If a is defined, will end up here because it is a type error to reference property of undefined
})
.catch(ReferenceError, function(e) {
// Will end up here if a wasn't defined at all
})
.catch(MyCustomError1, MyCustomError2, function(e) {
// Will end up here if one of the 2 defined above
})
.catch(function predicate(e) {
return e.code >= 400
}, function(e) {
// Will end up here if e.code >= 400
})
.catch(MyCustomError3, function predicate(e) {
return e.code < 300;
}, function(e) {
// You can mix predicates & error constructor to filter errors
})
.catch(function(e) {
// Generic catch-the rest, error wasn't TypeError nor ReferenceError
})
;
Alias: Promise.caught
More documentation on Angular's project and on Bluebird's project
Example:
$scope.jobRunning = true;
job.run(data)
.then(function(output) {
$scope.output = output;
})
.catch(errorHandler)
.finally(function() {
$scope.jobRunning = false;
})
;
Alias: Promise.lastly
More documentation on Angular's project
Example:
$q.all([somethingAsync1, somethingAsync2])
.spread(function(result1, result2) {
console.log(arguments);
})
;
More documentation on Bluebird's project
Example:
$http.get(url)
.then(function(result) {
console.log(result.data);
})
;
More documentation on Angular's project
Example:
$q.resolve(urls)
.map($http.get)
.all(function(results) {
console.log(results.join('\n'));
})
;
More documentation on Bluebird's project
Like .some(), with 1 as count.
However, if the promise fulfills, the fulfillment value is not an array of 1 but the value directly.
More documentation on Bluebird's project
Example:
$q.resolve(['http://some.url', urlPromise])
.each(function(url, index, length) {
return ping(url)
.catch(function() {
console.warn('Url ' + url + ' does not respond...');
})
;
})
;
More documentation on Bluebird's project
Example:
$q.resolve(values)
// keep only even numbers
.filter(function(val, i, length) {
return !(val % 2); // you can also return a promise here
})
;
More documentation on Bluebird's project
Example:
$q.resolve(values)
// square
.map(function(val, index, length) {
return val * val; // you can also return a promise here
})
;
More documentation on Bluebird's project
Example:
promise.resolve({
prop1: 42,
prop2: somePromise
})
.props()
.then(function(val) {
// val.prop === 42
// val.prop2 is the resolveValue of somePromise
})
;
More documentation on Bluebird's project
Example:
$q.resolve(values)
// sum values
.reduce(function(acc, val, index, length) {
return acc + val; // you can also return a promise here
}, 0)
;
More documentation on Bluebird's project
Not implemented yet
More documentation on Bluebird's project
Example:
promise.resolve([$q.resolve(42).delay(10), 21, $q.resolve(0).delay(20)])
// get first x promises that resolve (ignore rejections)
.some(2)
.then(function(vals) {
// vals === [21, 42]
})
;
More documentation on Bluebird's project
Example:
$q.resolve({
method: function(arg1, arg2) {}
})
// calls object's 'method' method with arg1 === 21 & arg2 === 42
.call('method', 21, 42)
;
More documentation on Bluebird's project
Example:
$q.resolve({
prop: 42
})
.get('prop')
// here value in then will be 42
;
$q.resolve([21, 42])
.get(1)
// here value in then will be 42
;
More documentation on Bluebird's project
Example:
$q.resolve(values)
.return(42)
// here value in then will be 42
;
Alias: Promise.returns & Promise.thenReturn
More documentation on Bluebird's project
Example:
$q.resolve(42)
.tap(function(val) {
console.log(val);
return $q.reolve(21).delay(10);
})
// here value in then will be 42 but it will sync promise
// on 21 and thus wait for the 10ms delay
More documentation on Bluebird's project
Example:
$q.resolve(42)
.throw(new Error('toto'))
// here the promise will coninue on its error flow with
// the constructed error
;
Alias: Promise.thenThrow
More documentation on Bluebird's project
Example:
$q.resolve([1,2,3]).nodeify(function(err, result) {
// err == null
// result is the array [1,2,3]
});
$q.resolve([1,2,3]).nodeify(function(err, a, b, c) {
// err == null
// a == 1
// b == 2
// c == 3
}, {spread: true});
More documentation on Bluebird's project
Example:
$q.resolve(42)
// wait 10ms before going through with the previous value
.delay(10)
// here value will be 42 in then
More documentation on Bluebird's project
Example:
$q.resolve($q.resolve(42).delay(20))
// fail if values do not resolve in 10ms max
.timeout(10, 'optional message to construct the TimeoutError with')
// thus here promise will be rejected with a $q.TImeoutError
;
More documentation on Bluebird's project
Example:
$q.reject(42)
.done() // will throw 42 globally
;
$q.resolve(42)
.done(function() {
// will throw 42 globally
return $q.reject(42);
})
;
$q.resolve(42)
.done(function() {
throw 42; // will throw 42 globally
})
;
$q.reject(42)
.done(null, function() {}) // will not throw
;
More documentation on Bluebird's project
The library is tested as much as possible. Right now there are:
We probably still miss tests, PR are welcome!
Pull requests are welcome! (and an issue tracker is available)
FAQs
Extend $q to make it look a lot more like bluebird
The npm package angular-extend-promises receives a total of 9 weekly downloads. As such, angular-extend-promises popularity was classified as not popular.
We found that angular-extend-promises demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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