Stopping an HTTP request and handling errors in Angular

Question

Stopping an HTTP request and handling errors in Angular

Hi, I need help with canceling my HTTP request after 2 seconds. If no data is received within that time frame, I want it to resolve into the error function and return an empty object.

I understand that I need to use the timeout property, but I'm not sure where exactly to use the $timeout. Can someone explain it to me in simpler terms?

app
  .service('testService',['$http','$q','$timeout',
    function($http,$q,$timeout){

      var canceler=$q.defer();

      this.options = function (long,lat) {


        return $http({
          method: 'POST',
          url: '/coordinates',
          headers: {
            'Content-Type' : 'application/json; charset=utf-8',
            'Data-Type': 'json'
          },
          data: {
            "long":long,
            "lat": lat
          },
          timeout:canceler.promise

        }).then(function (response) {
          return response.data;
        },function(error){
          return {};
        });
      };
    }]);

javascript angularjs http promise angular-promise

Answer 1

Answer №1

To incorporate the use of reject in your $timeout, follow this example:

$timeout(function(){
    return canceler.reject(reason);
},2000);

Your $http request should resemble the following structure:

var timeoutCase = function(){
    $timeout(function(){
        return canceler.reject(reason);
    },2000);
}

var apiCall = function(){

   // call the timeoutCase function
   timeoutCase();

   // make the http call
   return $http({
      method: 'POST',
      url: '/coordinates',
      headers: {
        'Content-Type' : 'application/json; charset=utf-8',
        'Data-Type': 'json'
      },
      data: {
        "long":long,
        "lat": lat
      },
      timeout:canceler.promise

    }).then(function (response) {
$timeout.cancel(timeoutCase);
      return response.data;
    },function(error){
      return {};
    });
}

// initiate the Http function
api().then(function(response){
    console.log(response);
})

Answer 2

To incorporate the use of reject in your $timeout, follow this example:

$timeout(function(){
    return canceler.reject(reason);
},2000);

Your $http request should resemble the following structure:

var timeoutCase = function(){
    $timeout(function(){
        return canceler.reject(reason);
    },2000);
}

var apiCall = function(){

   // call the timeoutCase function
   timeoutCase();

   // make the http call
   return $http({
      method: 'POST',
      url: '/coordinates',
      headers: {
        'Content-Type' : 'application/json; charset=utf-8',
        'Data-Type': 'json'
      },
      data: {
        "long":long,
        "lat": lat
      },
      timeout:canceler.promise

    }).then(function (response) {
$timeout.cancel(timeoutCase);
      return response.data;
    },function(error){
      return {};
    });
}

// initiate the Http function
api().then(function(response){
    console.log(response);
})

Answer 3

Answer №2

To customize your method's behavior, you can pass a configuration object when making the call (especially for POST requests):

post(url, data, [config]);

Within the config object, you have the option to set a timeout property:

timeout – {number|Promise} – specifies the request timeout in milliseconds or a promise that cancels the request upon resolution.

For instance, when invoking your POST method, you could include the timeout parameter like this:

$http.post('www.host.com/api/resource', {payload}, {timeout:2000})
          .then(function(){ //success });
          .catch(function(){ return {};});

The inclusion of return {}; is merely to demonstrate creating an empty object as mentioned earlier.

Referencing the angular documentation site can provide useful examples on utilizing the $http service.

Moreover, $timeout serves as Angular's equivalent to window.setTimeout; you can find detailed information in the documentation.

Consider using $timeout to execute the canceler promise or rely on the timeout property for request handling based on your specific requirements. While external timers can be used to cancel requests, it might be more efficient to utilize the built-in timeout feature.

Answer 4

To customize your method's behavior, you can pass a configuration object when making the call (especially for POST requests):

post(url, data, [config]);

Within the config object, you have the option to set a timeout property:

timeout – {number|Promise} – specifies the request timeout in milliseconds or a promise that cancels the request upon resolution.

For instance, when invoking your POST method, you could include the timeout parameter like this:

$http.post('www.host.com/api/resource', {payload}, {timeout:2000})
          .then(function(){ //success });
          .catch(function(){ return {};});

The inclusion of return {}; is merely to demonstrate creating an empty object as mentioned earlier.

Referencing the angular documentation site can provide useful examples on utilizing the $http service.

Moreover, $timeout serves as Angular's equivalent to window.setTimeout; you can find detailed information in the documentation.

Consider using $timeout to execute the canceler promise or rely on the timeout property for request handling based on your specific requirements. While external timers can be used to cancel requests, it might be more efficient to utilize the built-in timeout feature.

Answer 5

Answer №3

To achieve this task, utilize the $timeout function. You can terminate either the HTTP request or the timeout promise based on which one finishes first. If the timeout happens before the HTTP request, cancel the HTTP request; if the HTTP promise resolves prior to the timeout, cancel the timeout instead. Below is a sample code snippet:

var httpRequest = $http({
          method: 'POST',
          url: '/coordinates',
          headers: {
            'Content-Type' : 'application/json; charset=utf-8',
            'Data-Type': 'json'
          },
          data: {
            "long": long,
            "lat": lat
          }
        });

var timeoutPromise = $timeout(function () {
      httpRequest.reject("Timeout occurred"); // timeout happened first, reject the httpRequest.
}, 2000);

return httpRequest.then(function(data){
   $timeout.cancel(timeoutPromise); //HTTP request resolved before timeout, cancel the timeout.
   return data;
});

Answer 6

To achieve this task, utilize the $timeout function. You can terminate either the HTTP request or the timeout promise based on which one finishes first. If the timeout happens before the HTTP request, cancel the HTTP request; if the HTTP promise resolves prior to the timeout, cancel the timeout instead. Below is a sample code snippet:

var httpRequest = $http({
          method: 'POST',
          url: '/coordinates',
          headers: {
            'Content-Type' : 'application/json; charset=utf-8',
            'Data-Type': 'json'
          },
          data: {
            "long": long,
            "lat": lat
          }
        });

var timeoutPromise = $timeout(function () {
      httpRequest.reject("Timeout occurred"); // timeout happened first, reject the httpRequest.
}, 2000);

return httpRequest.then(function(data){
   $timeout.cancel(timeoutPromise); //HTTP request resolved before timeout, cancel the timeout.
   return data;
});

Stopping an HTTP request and handling errors in Angular

Answer №1

Answer №2

Answer №3

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