Function containing the $http.get method

Question

Function containing the $http.get method

I am facing an issue with my function containing multiple $http get requests. Despite needing to call another function after each request is completed, it always executes the function before the request finishes processing. What could be causing this and are there any solutions to resolve it?

$scope.json=function(){
        $scope.loading = true;
        $http.get(DataElementUrl).then(function (response) {
            if (!response.data == "")
            dataElementJson = response.data;

        });
        $http.get(categoryComboUrl).then(function (response) {
                if (!response.data == "")
                    categoryComboJson = response.data;                   
        });
        $http.get(categoryUrl).then(function (response) {
                    if (!response.data == "")
                       categoryJson = response.data;                        
        });
        check++;
        $scope.getJson();
};

javascript angularjs

Answer 1

Answer №1

To utilize the 'all' function of $q, follow this code snippet:

    var x = $http.get(DataElementUrl).then(function (response) {
        if (!response.data == "")
            dataElementJson = response.data;
    });
    
    var y = $http.get(categoryComboUrl).then(function (response) {
        if (!response.data == "")
            categoryComboJson = response.data;                   
    });
    
    var z = $http.get(categoryUrl).then(function (response) {
        if (!response.data == "")
           categoryJson = response.data;                        
    });

    $q.all([x, y, z]).then(function(result) {
      performAction++;
      $scope.fetchData();
    });

Answer 2

To utilize the 'all' function of $q, follow this code snippet:

    var x = $http.get(DataElementUrl).then(function (response) {
        if (!response.data == "")
            dataElementJson = response.data;
    });
    
    var y = $http.get(categoryComboUrl).then(function (response) {
        if (!response.data == "")
            categoryComboJson = response.data;                   
    });
    
    var z = $http.get(categoryUrl).then(function (response) {
        if (!response.data == "")
           categoryJson = response.data;                        
    });

    $q.all([x, y, z]).then(function(result) {
      performAction++;
      $scope.fetchData();
    });

Answer 3

Answer №2

The reason why this is happening is because of the asynchronous nature of network calls in JavaScript. To resolve this issue, you can explore the q service provided by Angular. This service functions as a promise library.

If you need to execute a method only after all three promises have been completed, you should utilize:

.all([promise1, promise2], fulfilled, rejected)

This will trigger the fulfilled callback once all promises in the array have been fulfilled.

Answer 4

The reason why this is happening is because of the asynchronous nature of network calls in JavaScript. To resolve this issue, you can explore the q service provided by Angular. This service functions as a promise library.

If you need to execute a method only after all three promises have been completed, you should utilize:

.all([promise1, promise2], fulfilled, rejected)

This will trigger the fulfilled callback once all promises in the array have been fulfilled.

Answer 5

Answer №3

This is how I would implement $q.all() in my code:

$scope.fetchData = function(){
    $scope.loading = true;

    var promises = [$http.get(DataElementUrl),
                    $http.get(categoryComboUrl),
                    $http.get(categoryUrl)]

    $q.all(promises).then(function(results){
          dataElementJson = results[0].data,
          categoryComboJson = results[1].data,
          categoryJson = results[2].data
    });
};

Answer 6

This is how I would implement $q.all() in my code:

$scope.fetchData = function(){
    $scope.loading = true;

    var promises = [$http.get(DataElementUrl),
                    $http.get(categoryComboUrl),
                    $http.get(categoryUrl)]

    $q.all(promises).then(function(results){
          dataElementJson = results[0].data,
          categoryComboJson = results[1].data,
          categoryJson = results[2].data
    });
};

Function containing the $http.get method

Answer №1

Answer №2

Answer №3

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