CODEWITHSUNDEEP
javascriptangularjsangular-promiseangularjs-q
serge
serge

Reputation: 15239

AngularJS promises, how to $q.first.then(others[])

In an AngularJs controller I need to ensure a paramount variable initialized before performing other tasks.

var firstPromise = $scope.watch("myParamount"...); // from ng-init
var otherPromises = []; // once obtained myParamount, do others

// something like this?!
$q.firstPromise.then.all(otherPromises).then(function(){
    console.log("first, then otherPromises completed!");
})

How to fix this "fake" code?

Upvotes: -1

Views: 53

Answers (1)

Nikolaj Dam Larsen
Nikolaj Dam Larsen

Reputation: 5684

Assuming those are actual promises, you should be able to use promise chaining to do something like this.

Here's a sample using timeouts for illustrative purposes: 

var firstPromise = $timeout(echo('first'), 1000);

firstPromise.then(function(data){
    console.log(data); // 'first'
    return $q.all([  // Other promises
        $timeout(echo('other 1'), 1000),
        $timeout(echo('other 2'), 500),
        $timeout(echo('other 3'), 1500)
    ]);;
}).then(function(data){
    console.log(data); // ['other 1', 'other 2', 'other 3']
});

function echo(v) { return function(){ return v; } }

That is one way to chain them, so the other promises isn't run until the first has resolved.

Upvotes: 1

Related Questions