incapable of utilizing the $q library and promises

Question

incapable of utilizing the $q library and promises

I am trying to make use of the variable StatusASof within the inserthtml function in the following manner.

App.controller("SS_Ctrl", function ($scope, $http, $location, $window, $sce, $q) {

var ShiftDetails = []; 

   function acquireMAStatusASof(Id) {
        var defer = $q.defer();
        $http({
            method: 'GET',
            url: 'http://xx/api/Sxxx/GetMAStatusASof',
            params: { Id: Id }        
        }).then(function successCallback(response) {            
            StatusASof = response.data;           
            alert("acquireMAStatusASof : " + StatusASof);  
            defer.resolve(response);
        }, function errorCallback(response) {});
    }

 function insertHtml(dates, ShiftDetails, Id) {

       // var promise = acquireMAStatusASof(Id); promise.then(

        var defer = $q.defer();
        acquireMAStatusASof(Id); 
    alert(StatusASof);  
    defer.resolve();       
        var Content;
        Content = '<table class="clsTable">  <tr>  <td rowspan="2">Cases ' + $scope.StatusASof + ' </td>  <td rowspan="2">Total</td> ';
        for (var i = 0; i <= 6; i++) {
            if (i == daySeq - 1) {            
                Content = Content + '<td colspan="3"  style="background-color:red"> {{dates[ ' + i + ']}} </td> ';
            }           
        }
}

However, $scope.StatusASof remains undefined when attempting to display the outcome. It appears that $q.defer is not functioning as expected.

What steps can I take to ensure that the code continues execution only after receiving data from getMAStatusASof(Id);

If anyone could provide assistance with this issue, it would be greatly appreciated.

javascript angularjs angularjs-scope angular-promise angularjs-q

Answer 1

Answer №1

Latest Update:

To retrieve the result, make sure to include return defer.promise; in your code.

function checkStatus(Id) {
    var defer = $q.defer();
    $http({
        method: 'GET',
        url: 'http://xx/api/Sxxx/GetMAStatusASof',
        params: { Id: Id }        
    }).then(function successCallback(response)  {            
        StatusAsOf = response.data;           
        alert("checkStatus : " + StatusAsOf);  --> Data received from API shown here.
        defer.resolve(StatusAsOf);
    }, function errorCallback(response) {
         deferred.reject(false); 
    });
    return defer.promise; 
}

You can then call this function like so:

checkStatus(Id).then(function(result){
  if(result){
    $scope.StatusAsOf = result;
  }
})

Answer 2

Latest Update:

To retrieve the result, make sure to include return defer.promise; in your code.

function checkStatus(Id) {
    var defer = $q.defer();
    $http({
        method: 'GET',
        url: 'http://xx/api/Sxxx/GetMAStatusASof',
        params: { Id: Id }        
    }).then(function successCallback(response)  {            
        StatusAsOf = response.data;           
        alert("checkStatus : " + StatusAsOf);  --> Data received from API shown here.
        defer.resolve(StatusAsOf);
    }, function errorCallback(response) {
         deferred.reject(false); 
    });
    return defer.promise; 
}

You can then call this function like so:

checkStatus(Id).then(function(result){
  if(result){
    $scope.StatusAsOf = result;
  }
})

Answer 3

Answer №2

Avoid using $q.defer() in this scenario...

Simply implement

function getMAStatusASof(Id) {
  return $http({
    method: 'GET',
    url: 'http://xx/api/Sxxx/GetMAStatusASof',
    params: { Id: Id }        
  })
  .then(function successCallback(response) {     
    return response.data;
  })
  .catch(function errorCallback(response) {
    return null;  //Ignore the error and return null instead.
  });
}

Then, utilize

getMAStatusASof(Id).then(function(result) {
  console.log(result);
});
//No need for .catch as all potential errors are handled within the getMAStatusASof function

If you insist on using $q.defer(), then the function should return defer.promise, similar to what Jazib mentioned.

However, utilizing $http already provides a promise, rendering the use of $q.defer() + return defer.promise unnecessary.

Save that approach for situations where you require wrapping something not inherently returning a promise. For instance, when monitoring the closure of a bootbox modal

function notifyMeOfClosing() {
  var deferred = $q.defer();
  bootbox.confirm("This is the default confirm!", function(result){ 
    if(result) {
      deferred.resolve();
    }
    else {
      deferred.reject();
    }
  });
  return deferred.promise;
}

Answer 4

Avoid using $q.defer() in this scenario...

Simply implement

function getMAStatusASof(Id) {
  return $http({
    method: 'GET',
    url: 'http://xx/api/Sxxx/GetMAStatusASof',
    params: { Id: Id }        
  })
  .then(function successCallback(response) {     
    return response.data;
  })
  .catch(function errorCallback(response) {
    return null;  //Ignore the error and return null instead.
  });
}

Then, utilize

getMAStatusASof(Id).then(function(result) {
  console.log(result);
});
//No need for .catch as all potential errors are handled within the getMAStatusASof function

If you insist on using $q.defer(), then the function should return defer.promise, similar to what Jazib mentioned.

However, utilizing $http already provides a promise, rendering the use of $q.defer() + return defer.promise unnecessary.

Save that approach for situations where you require wrapping something not inherently returning a promise. For instance, when monitoring the closure of a bootbox modal

function notifyMeOfClosing() {
  var deferred = $q.defer();
  bootbox.confirm("This is the default confirm!", function(result){ 
    if(result) {
      deferred.resolve();
    }
    else {
      deferred.reject();
    }
  });
  return deferred.promise;
}

Answer 5

Answer №3

Encountered an issue updating @Daniël Teunkens' post with the provided code snippet (from "}" to ")"). Therefore, presenting a new answer instead.

getMAStatusASof(Id).then(function(result) {
   // Insert your code here along with your HTML content.
     ....
  console.log(result);
})

This solution should hopefully resolve the problem.

Answer 6

Encountered an issue updating @Daniël Teunkens' post with the provided code snippet (from "}" to ")"). Therefore, presenting a new answer instead.

getMAStatusASof(Id).then(function(result) {
   // Insert your code here along with your HTML content.
     ....
  console.log(result);
})

This solution should hopefully resolve the problem.

incapable of utilizing the $q library and promises

Answer №1

Answer №2

Answer №3

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