Using AngularJS to make an $http.post request to an ASP.NET Web API controller with a basic data type

Seeking assistance with understanding the behavior of $http.post from AngularJS to ASP.NET WebAPI. Although the post is successful, the value received on the API is null. Despite verifying that the $scope object contains a value before posting, the issue persists.

It has become apparent that ASP.NET WebAPI handles posts data in an unconventional manner.

Below is the HTML code used to obtain input in Basic.html:

<form name="basicItem" novalidate ng-app="app" ng-controller="ItemCtrl">
<label id="titlelabel" class="required">Title</label>
<input ng-model="item.Title" type="text" id="titlefield" name="Title" required />

The following snippet from ItemController.js verifies validation and executes post requests using CORS due to separate domains:

app.controller("ItemCtrl", ['$scope', '$http', function($scope, $http) {
$scope.submitForm = function(form) {

if (form.$valid) {       //If Title has some value
    item = {
    "Title": $scope.item.Title,     //Set "Title" to the user input
           }
    alert($scope.item.Title);        //This confirms that the value is not null
    $http.post("http://localhost:50261",
      {
      testTitle: $scope.item.Title       //Potential issue lies here, setting the parameter for API post
      }).success(function(result) {     
           alert('Success!');            
      }).error(function(data) {
           alert("Valid but didn't connect");
      console.log(data);
      })

The API controller EntryController.cs comprises the following code snippet:

[HttpPost]
public string CreateEntry([FromBody]string testTitle)
{
     return testTitle; //returns null!!!
}

After researching about the necessity of [FromBody] and utilizing only one simple parameter, as well as experimenting with wrapping the post value in quotes or adding a leading "=" sign, none of these methods have yielded success. Any guidance or suggestions would be greatly appreciated.

Answer №1

As pointed out by bluetoft, the issue lies in how WebAPI handles serialization in a somewhat unconventional manner.

If your controller requires a primitive type with the [FromBody] attribute, it anticipates =value in the POST body rather than JSON. You can find further information on this subject here.

Therefore, your request should only include the primitive value, like so:

    $http.post(urlTest, '"' + $scope.item.Title +'"').success(function(result) { 
        alert('Success!');
    }).error(function(data) {
        alert("Error!");
    });

It is also important to note the concatenation of double quotes to ensure that the submitted value is indeed "Your Title", rather than just Your Title, which would render it an invalid string.

Answer №2

The handling of serialization in .NET web api controllers can be a bit peculiar. Make sure to remember to use JSON.stringify on your data before processing it. Implement this snippet in your controller:

 $http.post("http://localhost:50261",
      JSON.stringify({
      testTitle: $scope.item.Title       
      })).success(function (result) {     //the parameter of API post
           alert('Success!');            
      }).error(function (data) {
           alert("Valid but didn't connect");
      console.log(data);
      })

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