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

Similar questions

The relentless Livewire Event Listener in JavaScript keeps on running without pausing

Upon employing the setTimeout method, the element with the id "sign-in-block" will have its display style set to "none" after a delay of 1000 milliseconds

Timed up 10-second countdown with vue.js

The scope of the UI Bootstrap directive does not seem to be getting refreshed

Hold off on creating the directive until the page has fully loaded and is operating smoothly

Develop an ngDialog template that can be easily reused across different projects

Conceal flexbox item depending on neighboring element dimensions or content

Setting a default value in react-select

How can Cheerio help you effortlessly and stylishly locate tags that meet various specific criteria?

Creating flexible items with a 1:1 ratio and ensuring that the padding on the left and right of the flex container remains consistent

Mastering the art of storing data in AngularJS services

gulp-open not functioning properly following the use of createWriteStream

The behavior of the input's key down function is being influenced by Google Place Autocomplete

Eliminate the need for index.html in the URL when using MVC WebApi

Want to learn how to create an image magnifier using just one image?

How can I determine the package version that is being used when requiring it in Node.js?

jqGrid display/hide columns options dialogue box

Angularfire allows for easy and efficient updating of fields

Expanding the padding of the selected item to create more breathing room

Using axios to pass parameters in a URL with the GET method on a localhost server