What are the best strategies for mastering conditional promises in Angular?

Question

What are the best strategies for mastering conditional promises in Angular?

I've been struggling with a problem in angularjs for several hours now.

Here's the pseudo code I'm working with:

doSomething(param){

    var res;
    if(param = "ok"){
        //perform some api calls with promises
        res = promise result
     }

    doSomeStuff(){
        //if res variable is set, continue here...
        // else
        //if res is not set, do something else...
    }

My question is: How can I achieve this functionality? The doSomeStuff function needs to be aware of whether the res variable has been set or not. It should either wait for it or proceed accordingly if not set.

javascript angularjs

Answer 1

Answer №1

To perform a single API call, you can utilize the then() method of the $http.

doTask(parameter){
    if(parameter === "ok"){
        //execute an API call with promise
        $http({
           method: 'GET',
           url: apiUrl
        }).then(
           function onSuccess(response) {
                processResponse(response);
           },
           function onError(response) {
              console.log(response);
           }
        );
    }      
}

When dealing with multiple API calls:

var doTask = function (parameter){
    if(parameter === "ok"){
       // Assuming listeUrl is an array containing URLs for API calls   
       var promises = [];
       for (var index in listeUrl ) {

          promises.push( //Add promises to an array
              $http({
                 method: 'GET',
                 url: listeUrl[index]
              }).then(function onSuccess(response) {
                 return response.data;
              })
          );
       }
       return $q.all(promises); // Wait for all promises to resolve before moving on to the next .then
    }      
}

doTask("ok").then(function(result){
    processResponse(result);
});

Answer 2

To perform a single API call, you can utilize the then() method of the $http.

doTask(parameter){
    if(parameter === "ok"){
        //execute an API call with promise
        $http({
           method: 'GET',
           url: apiUrl
        }).then(
           function onSuccess(response) {
                processResponse(response);
           },
           function onError(response) {
              console.log(response);
           }
        );
    }      
}

When dealing with multiple API calls:

var doTask = function (parameter){
    if(parameter === "ok"){
       // Assuming listeUrl is an array containing URLs for API calls   
       var promises = [];
       for (var index in listeUrl ) {

          promises.push( //Add promises to an array
              $http({
                 method: 'GET',
                 url: listeUrl[index]
              }).then(function onSuccess(response) {
                 return response.data;
              })
          );
       }
       return $q.all(promises); // Wait for all promises to resolve before moving on to the next .then
    }      
}

doTask("ok").then(function(result){
    processResponse(result);
});

Answer 3

Answer №2

Implement the 'then' method in Angular to handle promise resolution and verify the data before executing any specific logic.

Answer 4

Implement the 'then' method in Angular to handle promise resolution and verify the data before executing any specific logic.

What are the best strategies for mastering conditional promises in Angular?

Answer №1

Answer №2

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