Repetitive series of HTTP requests within a looping structure

Question

Repetitive series of HTTP requests within a looping structure

Within my AngularJS project, I encounter the need to execute a varying number of HTTP requests in sequence. To achieve this, I believe that utilizing a loop is necessary:

for (let i = 0; i < $scope.entities.length; i++) {
    MyService.createFixedValue($scope.id, $scope.entities[i]);
}

The function MyService.createFixedValue represents an HTTP POST request:

service.createFixedValue = function(property_id, fixed_value_entity){
    return $http({
        method: 'POST',
        url: '/my_url',
        headers: {
            'Content-Type': 'application/json'
        },
        data: fixed_value_entity
    });
}

However, this approach leads to asynchronous requests. What adjustments should be made to ensure sequential execution?

javascript angularjs

Answer 1

Answer №1

Optimal Method for Processing HTTPRequests

To efficiently handle a series of HTTPRequests, it is recommended to utilize the for...of loop alongside async / await.

Create an async function following this example structure:

async function executeSequentialRequests(id, entities) {
  for (const entity of entities) {
    await MyService.handleHTTPRequest(id, entity);
  }
}

Execute the function by passing the relevant properties from your scope.

executeSequentialRequests($scope.id, $scope.entities);

Efficient Approach: Sending Data in Bulk

Instead of individual requests for each entity, consider sending the entire array in a single HTTPRequest for improved efficiency.

MyService.sendDataInBulk = function(property_id, data_array) {
  return $http({
    method: 'POST',
    url: '/my_url'
    headers: {
      'Content-Type': 'application/json'
    },
    data: data_array
  });
}

Pass the complete array from $scope.entities as the second argument during the function call.

MyService.sendDataInBulk($scope.id, $scope.entities);

Remember to adjust the server-side handling accordingly since you are now transmitting an array rather than single values. As for processing the server's response, that aspect remains within your domain of control.

Answer 2

Optimal Method for Processing HTTPRequests

To efficiently handle a series of HTTPRequests, it is recommended to utilize the for...of loop alongside async / await.

Create an async function following this example structure:

async function executeSequentialRequests(id, entities) {
  for (const entity of entities) {
    await MyService.handleHTTPRequest(id, entity);
  }
}

Execute the function by passing the relevant properties from your scope.

executeSequentialRequests($scope.id, $scope.entities);

Efficient Approach: Sending Data in Bulk

Instead of individual requests for each entity, consider sending the entire array in a single HTTPRequest for improved efficiency.

MyService.sendDataInBulk = function(property_id, data_array) {
  return $http({
    method: 'POST',
    url: '/my_url'
    headers: {
      'Content-Type': 'application/json'
    },
    data: data_array
  });
}

Pass the complete array from $scope.entities as the second argument during the function call.

MyService.sendDataInBulk($scope.id, $scope.entities);

Remember to adjust the server-side handling accordingly since you are now transmitting an array rather than single values. As for processing the server's response, that aspect remains within your domain of control.

Answer 3

Answer №2

To execute HTTP requests in sequence, utilize the combination of $q.all and array.reduce:

var sequentialPromise = $scope.entities.reduce( (p, ent)  => {
    var pn = MyService.createFixedValue($scope.id, ent);
    var valuePromise = pn.then(response => response.data);
    var newP = p.then( vArr => {
        return $q.all([...vArr, valuePromise]);
    });
    return newP;
}, $q.when([]) );

sequentialPromise.then(valueArr => {
    console.log(valueArr);
}).catch(error => {
    console.log(error);
});

For further details, refer to:

Answer 4

To execute HTTP requests in sequence, utilize the combination of $q.all and array.reduce:

var sequentialPromise = $scope.entities.reduce( (p, ent)  => {
    var pn = MyService.createFixedValue($scope.id, ent);
    var valuePromise = pn.then(response => response.data);
    var newP = p.then( vArr => {
        return $q.all([...vArr, valuePromise]);
    });
    return newP;
}, $q.when([]) );

sequentialPromise.then(valueArr => {
    console.log(valueArr);
}).catch(error => {
    console.log(error);
});

For further details, refer to:

Answer 5

Answer №3

Instead of returning an http POST request, consider simply executing the post request within the function without returning anything. To capture the response, you can store it in a global array.

Answer 6

Instead of returning an http POST request, consider simply executing the post request within the function without returning anything. To capture the response, you can store it in a global array.

Repetitive series of HTTP requests within a looping structure

Answer №1

Optimal Method for Processing HTTPRequests

Efficient Approach: Sending Data in Bulk

Answer №2

Answer №3

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