What is the best way to group Angular $http.get() requests for efficiency?

Question

What is the best way to group Angular $http.get() requests for efficiency?

My challenge involves a controller that must retrieve two distinct REST resources to populate two dropdowns. I want to ensure that neither dropdown is populated until both $http.get() calls have completed, so that the options are displayed simultaneously rather than sequentially.

Is there a way to combine these $http.get() calls in a graceful manner and efficiently manage setting the $scope variables for both arrays without needing to handle different scenarios where one resource returns before the other?

javascript angularjs

Answer 1

Answer №1

Upon invoking the Angular $http function, you receive a Promise object that utilizes $q (a promise/deferred structure influenced by Kris Kowal's Q).

If you refer to the documentation for the $q.all(promises) method:

It merges multiple promises into a single promise that resolves only when all input promises are resolved.

Parameters

promises – {Array.<Promise>} – An array containing promises.

Returns

{Promise} – Delivers a solitary promise that resolves with an array of values, each value corresponding to the promise at the same index in the promises array. In case any of the promises resolve with a rejection, this resulting promise will also be resolved with the same rejection.

You have the ability to utilize $q.all to consolidate the outcomes of your http requests, utilizing code similar to the following:

app.controller("AppCtrl", function ($scope, $http, $q) {

  $q.all([
    $http.get('/someUrl1'),
    $http.get('/someUrl2')
  ]).then(function(results) {
     /* your logic here */
  });
}

Answer 2

Upon invoking the Angular $http function, you receive a Promise object that utilizes $q (a promise/deferred structure influenced by Kris Kowal's Q).

If you refer to the documentation for the $q.all(promises) method:

It merges multiple promises into a single promise that resolves only when all input promises are resolved.

Parameters

promises – {Array.<Promise>} – An array containing promises.

Returns

{Promise} – Delivers a solitary promise that resolves with an array of values, each value corresponding to the promise at the same index in the promises array. In case any of the promises resolve with a rejection, this resulting promise will also be resolved with the same rejection.

You have the ability to utilize $q.all to consolidate the outcomes of your http requests, utilizing code similar to the following:

app.controller("AppCtrl", function ($scope, $http, $q) {

  $q.all([
    $http.get('/someUrl1'),
    $http.get('/someUrl2')
  ]).then(function(results) {
     /* your logic here */
  });
}

Answer 3

Answer №2

Is this what you had in mind?

function anotherController( $scope, $http, $q ) {
    var firstRequest = $http.get("url_one"),
        secondRequest = $http.get("url_two");
    $q.all([firstRequest, secondRequest]).then(function(resultsArray) { 
        //you will receive results from both requests here
    });
}

Check out: Angular JS Documentation

Answer 4

Is this what you had in mind?

function anotherController( $scope, $http, $q ) {
    var firstRequest = $http.get("url_one"),
        secondRequest = $http.get("url_two");
    $q.all([firstRequest, secondRequest]).then(function(resultsArray) { 
        //you will receive results from both requests here
    });
}

Check out: Angular JS Documentation

Answer 5

Answer №3

If you're looking to streamline your asynchronous JavaScript tasks, consider integrating the Async.js library found at: https://github.com/caolan/async.

Utilize the series function within the library to execute two calls sequentially and trigger a single callback once both are completed.

Answer 6

If you're looking to streamline your asynchronous JavaScript tasks, consider integrating the Async.js library found at: https://github.com/caolan/async.

Utilize the series function within the library to execute two calls sequentially and trigger a single callback once both are completed.

What is the best way to group Angular $http.get() requests for efficiency?

Answer №1

Answer №2

Answer №3

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