Bringing together two commitments in angularjs

Question

Bringing together two commitments in angularjs

I am facing an issue while trying to combine 2 promises in a service. I have 2 methods - one is "UserService.getAuthenticatedUser()" which fetches the current user information, and the other is "UserService.getAccountTypeData(idUser)" which retrieves the user type information. However, in order to access the second method, I need the userID. So essentially, I first call "UserService.getAuthenticatedUser()" to get the id, and then call "UserService.getAccountTypeData(idUser)", but it's not working as expected.

 function isAccount(accountName) {
             UserService.getAuthenticatedUser()
                .then(function (response) {
                    var userDetails = response.data;

                });


            UserService.getAccountTypeData(idUser)
                .then(function (response) {
                    var userDetails = response.data;
                    return  userDetails;
                });

}

PS: I have already injected the service...

javascript angularjs

Answer 1

Answer №1

To create a chain of promises, you can return values from each of your .then() functions.

function checkAccountValidity(accountName) {
    return UserService.getAuthenticatedUser(accountName) 
        .then(function(response) {
            var userDetails = response.data;
            return userDetails.Id; 
        })
        .then(UserService.getAccountTypeData) 
        .then(function(response) {
            var userDetails = response.data;
            return userDetails;
        });

}

// implementation
checkAccountValidity('AccountA').then(function(userDetails) {
    // utilize userDetails in some way
});

Answer 2

To create a chain of promises, you can return values from each of your .then() functions.

function checkAccountValidity(accountName) {
    return UserService.getAuthenticatedUser(accountName) 
        .then(function(response) {
            var userDetails = response.data;
            return userDetails.Id; 
        })
        .then(UserService.getAccountTypeData) 
        .then(function(response) {
            var userDetails = response.data;
            return userDetails;
        });

}

// implementation
checkAccountValidity('AccountA').then(function(userDetails) {
    // utilize userDetails in some way
});

Answer 3

Answer №2

When handling asynchronous calls, the .then() method is key. It executes the function and links up the callback to an anonymous function passed as a parameter to then(). If the second call relies on the outcome of the first, you can nest them as shown below...

function checkAccount(accountName) {
      UserService.getAuthenticatedUser()
         .then(function (response) {
             var userDetails = response.data;
             UserService.getAccountTypeData(idUser)
                .then(function (response) {
                    var userDetails = response.data;
                    return  userDetails;
                });
         });
}

Answer 4

When handling asynchronous calls, the .then() method is key. It executes the function and links up the callback to an anonymous function passed as a parameter to then(). If the second call relies on the outcome of the first, you can nest them as shown below...

function checkAccount(accountName) {
      UserService.getAuthenticatedUser()
         .then(function (response) {
             var userDetails = response.data;
             UserService.getAccountTypeData(idUser)
                .then(function (response) {
                    var userDetails = response.data;
                    return  userDetails;
                });
         });
}

Bringing together two commitments in angularjs

Answer №1

Answer №2

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