Using Angular's promise queue to efficiently handle loading data

Question

Using Angular's promise queue to efficiently handle loading data

My approach with Angular's $q promise looks like this:

$scope.loadingData = true; // display loading spinner on the view 
var itemsToProcess = [....];

for(int i = 0; i < itemsToProcess.length; i++) {
    var itemToProcess = itemsToProcess[i];

    makeServiceCallThatReturnsPromise(itemToProcess)
        .then(function(response) {
                   processAndDisplayResponse(response);
         });
}

$loadingData = false; // hide loading spinner

One issue I am facing is that since the service call promises are queued, the loading indicator disappears before all the data is returned.

How can I ensure that the loading flag remains set until all promises are fulfilled?

javascript angularjs

Answer 1

Answer №1

Utilize the $q.all() method for handling multiple promises at once.

let arrayOfPromises=[];
for(let i=0; i<items.length; i++) {
    let item = items[i];

  arrayOfPromises.push(  serviceCallToReturnPromise(item)
        .then(function(response) {
                 //perform tasks here
         }));

}

$q.all(arrayOfPromises).then(function(){
  processAndRender(response);
})

Answer 2

Utilize the $q.all() method for handling multiple promises at once.

let arrayOfPromises=[];
for(let i=0; i<items.length; i++) {
    let item = items[i];

  arrayOfPromises.push(  serviceCallToReturnPromise(item)
        .then(function(response) {
                 //perform tasks here
         }));

}

$q.all(arrayOfPromises).then(function(){
  processAndRender(response);
})

Answer 3

Answer №2

The recommended method for achieving this is through the use of $q.all().

Answer 4

The recommended method for achieving this is through the use of $q.all().

Answer 5

Answer №3

Utilizing $q.all(arrayOfPromises).then(successFunction(), failureFunction()).[catch] can be helpful in this scenario.

var completionStatus = false;

function processPromises() {
    var promiseList = [];
    angular.forEach(itemsArray, function(item, index) {
        var promise = createPromise(item);
        promiseList.push(promise);
    });
    $q.all(promiseList).then(onSuccess, onFailure);
}

function onSuccess(data) {
    completionStatus = true;
};

function onFailure(error) {
    completionStatus = false;
};

It is important to note that if one promise fails, the failureFunction will still be triggered even if other promises have succeeded. $q.all failure called

Answer 6

Utilizing $q.all(arrayOfPromises).then(successFunction(), failureFunction()).[catch] can be helpful in this scenario.

var completionStatus = false;

function processPromises() {
    var promiseList = [];
    angular.forEach(itemsArray, function(item, index) {
        var promise = createPromise(item);
        promiseList.push(promise);
    });
    $q.all(promiseList).then(onSuccess, onFailure);
}

function onSuccess(data) {
    completionStatus = true;
};

function onFailure(error) {
    completionStatus = false;
};

It is important to note that if one promise fails, the failureFunction will still be triggered even if other promises have succeeded. $q.all failure called

Using Angular's promise queue to efficiently handle loading data

Answer №1

Answer №2

Answer №3

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