Problems encountered while invoking a function using ng-click within an AngularJS controller?

Question

Problems encountered while invoking a function using ng-click within an AngularJS controller?

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When attempting to login, I trigger the simple login() function of the AuthController using ng-click on the login form button. However, upon calling this function, I encounter an error message in the console that I am unable to interpret. In Firefox, the error is "args is null", while in Chrome, it states "

TypeError: Cannot read property '0' of null

". I'm unsure how to troubleshoot this issue. Why is it failing to work?

Please note that any username or password can be entered.

javascript angularjs controller

Answer 1

Answer №1

The login in the ng-click="login()" attribute refers to the "login" form, not the $scope.login function.

Here is the current setup:

<div ng-controller="AuthController as auth">  
   <form name="login">
     <button ng-click="login()">login</button>
   </form>
</div>

And in the controller:

$scope.login = function(){
}

The variable login inside the form shadows the login function defined in the controller. Therefore, Angular does not invoke the function for ng-click="login()".

Solutions:

#1 Use the ControllerAs syntax:

this.login = function(){
}

and update the button like this:

<button ng-click="auth.login()">

Alternatively, #2 - rename either the function or the form:

<form name="loginForm">
   <button ng-click="login()">login</button>
</form>

Answer 2

The login in the ng-click="login()" attribute refers to the "login" form, not the $scope.login function.

Here is the current setup:

<div ng-controller="AuthController as auth">  
   <form name="login">
     <button ng-click="login()">login</button>
   </form>
</div>

And in the controller:

$scope.login = function(){
}

The variable login inside the form shadows the login function defined in the controller. Therefore, Angular does not invoke the function for ng-click="login()".

Solutions:

#1 Use the ControllerAs syntax:

this.login = function(){
}

and update the button like this:

<button ng-click="auth.login()">

Alternatively, #2 - rename either the function or the form:

<form name="loginForm">
   <button ng-click="login()">login</button>
</form>

Answer 3

Answer №2

Check your AuthService for a typo: '/' should be '.' which may be causing issues with your regex pattern:

login: function(data) {
  return $http/post('/api/auth/login')
},

Another issue to watch out for is using "controller as" in the HTML but still using $scope in the controller:

ng-controller="AuthController as auth"

Make sure to update references to objects/functions to use the correct controller name such as changing ng-click="login()" to ng-click="auth.login()".

Answer 4

Check your AuthService for a typo: '/' should be '.' which may be causing issues with your regex pattern:

login: function(data) {
  return $http/post('/api/auth/login')
},

Another issue to watch out for is using "controller as" in the HTML but still using $scope in the controller:

ng-controller="AuthController as auth"

Make sure to update references to objects/functions to use the correct controller name such as changing ng-click="login()" to ng-click="auth.login()".

Problems encountered while invoking a function using ng-click within an AngularJS controller?

Answer №1

Answer №2

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