"Can anyone provide insights on how to retrieve the URL within the .success function of the $http.get function in Angular

Question

"Can anyone provide insights on how to retrieve the URL within the .success function of the $http.get function in Angular

Here is the code snippet of my controller:

var app = angular.module('callapp', []);
app.controller('eController', function($scope, $http, $log) {
    $scope.urlString = []; //these values are populated

    for( var i=0; i<3; ++i)
    {
        var currentURL = $scope.urlString[i];
        $http.get(currentURL)
        .success( function(response) {
            //how can I access currentURL here?
            $log.info(this.currURL) //this prints "undefined"
        });
    }

The URLs are dynamically generated before the loop executes. Data needs to be fetched from these URLs which are sent as asynchronous requests.

I attempted using $.ajax(currentURL) instead of $http.get method, but encountered the same issue - "undefined".

Is there a possible way to access both the currentURL and the 'i' value inside the .success(function ())?

javascript ajax angularjs angularjs-scope

Answer 1

Answer №1

currentUrl is easily accessible, and when performing AJAX requests within a for loop, the last index value i will always be retrieved because the renderer prints the value after receiving a 200 response from the AJAX request. This can create a timing issue where the for loop has already completed by the time the value is printed, resulting in the last index being stored in i. To address this issue, an IIFE should be utilized.

For demonstration purposes, a Fake Online REST API - http://jsonplaceholder.typicode.com/ - is being used.

RUNNING DEMO: http://plnkr.co/edit/djPMu4UH9t9BeGwBcUMI

HTML:

<body ng-app="callapp" ng-controller="eController">
</body>

JS:

var app = angular.module('callapp', []);
app.controller('eController', function($scope, $http, $log) {
    $scope.baseUrl = "http://jsonplaceholder.typicode.com/posts/";
    $scope.urlString = [
      $scope.baseUrl + '1',
      $scope.baseUrl +'2',
      $scope.baseUrl + '3'
    ]; //this is filled with values


    for( var i=0; i<3; ++i) {
       (function(index) {
        var currentURL = $scope.urlString[i];
        $http.get(currentURL)
        .success( function(response) {
            $log.info(index+1, currentURL);
        });
      })(i);
    }
});

app.$inject = ['$scope', '$http', '$log'];

Answer 2

currentUrl is easily accessible, and when performing AJAX requests within a for loop, the last index value i will always be retrieved because the renderer prints the value after receiving a 200 response from the AJAX request. This can create a timing issue where the for loop has already completed by the time the value is printed, resulting in the last index being stored in i. To address this issue, an IIFE should be utilized.

For demonstration purposes, a Fake Online REST API - http://jsonplaceholder.typicode.com/ - is being used.

RUNNING DEMO: http://plnkr.co/edit/djPMu4UH9t9BeGwBcUMI

HTML:

<body ng-app="callapp" ng-controller="eController">
</body>

JS:

var app = angular.module('callapp', []);
app.controller('eController', function($scope, $http, $log) {
    $scope.baseUrl = "http://jsonplaceholder.typicode.com/posts/";
    $scope.urlString = [
      $scope.baseUrl + '1',
      $scope.baseUrl +'2',
      $scope.baseUrl + '3'
    ]; //this is filled with values


    for( var i=0; i<3; ++i) {
       (function(index) {
        var currentURL = $scope.urlString[i];
        $http.get(currentURL)
        .success( function(response) {
            $log.info(index+1, currentURL);
        });
      })(i);
    }
});

app.$inject = ['$scope', '$http', '$log'];

Answer 3

Answer №2

You have the option to set up an HttpInterceptor, which allows you to manage and intercept all requests.

For more information, visit: https://docs.angularjs.org/api/ng/service/$http#interceptors

$provide.factory('myHttpInterceptor', function($q) {
  return {
     // optional method
     'request': function(config) {
       // This is your URL:
       console.log(config.url);
       return config;
     },
  };
});

Remember to add the httpInterceptor by using this code snippet:

$httpProvider.interceptors.push('myHttpInterceptor');

Answer 4

You have the option to set up an HttpInterceptor, which allows you to manage and intercept all requests.

For more information, visit: https://docs.angularjs.org/api/ng/service/$http#interceptors

$provide.factory('myHttpInterceptor', function($q) {
  return {
     // optional method
     'request': function(config) {
       // This is your URL:
       console.log(config.url);
       return config;
     },
  };
});

Remember to add the httpInterceptor by using this code snippet:

$httpProvider.interceptors.push('myHttpInterceptor');

Answer 5

Answer №3

Assign the value to a $scope variable since this.currUrl is not defined

 var app = angular.module('callapp', []);
    app.controller('eController', function($scope, $http, $log) {
        $scope.urlString = []; //contains values

        for( var i=0; i<3; ++i)
        {
            $scope.currentURL = $scope.urlString[i];
            $http.get($scope.currentURL)
            .success( function(response) {
                //How can I retrieve currentURL here?

            });
 $log.info($scope.currentURL);
        }

Answer 6

Assign the value to a $scope variable since this.currUrl is not defined

 var app = angular.module('callapp', []);
    app.controller('eController', function($scope, $http, $log) {
        $scope.urlString = []; //contains values

        for( var i=0; i<3; ++i)
        {
            $scope.currentURL = $scope.urlString[i];
            $http.get($scope.currentURL)
            .success( function(response) {
                //How can I retrieve currentURL here?

            });
 $log.info($scope.currentURL);
        }

Answer 7

Answer №4

Instead of using a traditional for loop, consider utilizing the angular forEach method. To learn more about angularForEach, please refer to this link.

var app = angular.module('callapp', []);
app.controller('eController', function($scope, $http, $log) {
$scope.baseUrl = "http://jsonplaceholder.typicode.com/posts/";
$scope.urlString = [$scope.baseUrl + '1', $scope.baseUrl +'2',$scope.baseUrl + '3']; //This array is populated

angular.forEach($scope.urlString,function(value,key){

    $http.get(value)
    .success( function(response) {
        $log.info(value) 
    });
}    
});

app.$inject = ['$scope', '$http', '$log'];

Answer 8

Instead of using a traditional for loop, consider utilizing the angular forEach method. To learn more about angularForEach, please refer to this link.

var app = angular.module('callapp', []);
app.controller('eController', function($scope, $http, $log) {
$scope.baseUrl = "http://jsonplaceholder.typicode.com/posts/";
$scope.urlString = [$scope.baseUrl + '1', $scope.baseUrl +'2',$scope.baseUrl + '3']; //This array is populated

angular.forEach($scope.urlString,function(value,key){

    $http.get(value)
    .success( function(response) {
        $log.info(value) 
    });
}    
});

app.$inject = ['$scope', '$http', '$log'];

"Can anyone provide insights on how to retrieve the URL within the .success function of the $http.get function in Angular

Answer №1

Answer №2

Answer №3

Answer №4

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