AngularJS-在POST请求中使用这个vs$scope[重复]

Question

var app = angular.module('TM', []);

app.controller('tableController', function($scope, $http){

    //Empty object that gets filled with data and sent as a POST request.
    this.formData = {};

    // Define process for submitting form
    //TODO: FIND OUT THE DIFFERENCE BETWEEN $SCOPE AND THIS
    this.processForm = function() {
        console.log('Inside processForm method');

        $('#addEntry').modal('hide');
        console.log($scope.formData); //If I use this here - the object is empty
        $http({
            method : 'POST',
            url :'../protocols',
            data : JSON.stringify($scope.formData), 
            headers : {
                'dataType' : "json",
                'contentType' : "application/json"
            }
        })
        .success(function(data) {
            console.log('Success: ' + data);

            //Empties the object after the POST request is done...
            $scope.formData = {}
        })
        .error(function(data){
            console.log('Error ' + data);
        });
    };
});

Answer 1

您需要意识到Javascript有多个作用域，this关键字指的是您正在操作的作用域。

然后，就像@Henri S提到的那样，您还应该意识到控制器的作用域（它是一个JavaScript contructor函数）与您在里面使用的$scope不同。Angular使用的$scope是一个与控制器相关联的对象，从一开始就是一个viewmodel。你的HTML，在某个控制器的控制下可以‘访问’这个对象。如果创建控制器链，$scope将原型继承。

如果我们将此应用于您的代码：

var app = angular.module('TM', []);

app.controller('tableController', function($scope, $http){

   var self = this; //We capture a reference/value of the scope of your controller

    this.formData = {};
    this.currentDataObject : {restURL: "../protocols"} 

    // Define process for submitting form
    this.processForm = function() { //Here begins a new javascript scope
        console.log('Inside processForm method');

        $('#addEntry').modal('hide');
        console.log(self.formData); // this will refer to the this.formdata

        $http({
            method : 'POST',
            url : self.currentDataObject.restURL,
            data : JSON.stringify(self.formData), 
            headers : {
                'dataType' : "json",
                'contentType' : "application/json"
            }
        })
        .success(function(data) {
            console.log('Success: ' + data);

            //Empties the object after the POST request is done...
            self.formData = {}
        })
        .error(function(data){
            console.log('Error ' + data);
        });
    };
});