Angular JS does not allow preventDefault or return

问题:

I have a form I'd like to deliver via AJAX :

<form class="form-inline ng-pristine" ng-submit="sendForm()" method="post" action="/sign_up" accept-charset="UTF-8">

$scope.sendForm = (e) ->
  e.preventDefault ->
  console.log 'sendForm()'
  return false  

The console.log appears, and immediately it delivers the form.

It ignores both the e.preventDefault(), and the return false.

AngularJS reminds me of the honey badger. It just doesn't care.

回答1:

I know I am pretty late to the party, but in case you did not figure it out yet, you can keep the action and make sure the form is not actually submitted by passing $event to the ng-submit function. Then you can use event.preventDefault(); in your controller after you do all your processing.

So in your case it would be:

<form class="form-inline ng-pristine" ng-submit="sendForm($event)" method="post" action="/sign_up" accept-charset="UTF-8">

$scope.sendForm = (e) ->
  // doing stuff
  e.preventDefault()

Hope this helps.

回答2:

Well, you're not doing it the "Angular way". Angular provides a directive called ng-submit, which does that preventDefault for you (as long as you don't have an action attribute specified on your form).

Markup (with validation!)

<form name="myForm" ng-submit="sendForm()">
  <div>
    <input type="text" name="name" ng-model="data.name" required/>
    <span ng-show="myForm.name.$error.required && myForm.name.$dirty">required</span>
  </div>
  <div>
    <input type="email" name="email" ng-model="data.email" required/>
    <span ng-show="myForm.name.$error.required && myForm.name.$dirty">required</span>
    <span ng-show="myForm.name.$error.email && myForm.name.$dirty">invalid email</span>
  </div>
  <button type="submit" ng-disabled="myForm.$invalid">Submit</button>
</form>

Code

app.controller("MyCtrl", function($scope, $http) {
    $scope.sendForm = function (){
       $http.post('/Submit/To/Url', $scope.data).success(function(data) {
           alert('done!');
       });
    };
});

回答3:

You can get the event by passing $event into your ng-click or ng-submit. It's like dependency injection, except in your expressions.

html

<form class="form-inline ng-pristine" ng-submit="sendForm($event)" method="post" action="/sign_up" accept-charset="UTF-8">

coffeescript

$scope.sendForm = (e) ->
  e.preventDefault()
  console.log 'sendForm()'
  false  

回答4:

Here is a better solution of all of the other answers.

Let suppose you have html5 validation required attribute attached to form elements.

Now

<button ng-submit="Save($event)">SEND ME</button>

And now you function

$scope.Save = function($event){

    $event.preventDefault();
    .
    . // may be an ajax request
    .

    return false;
}

This will not only trigger html5 validation but also this will prevent form submission redirect.

回答5:

Other way to solve this is with a directives.

app.directive("submit", [function () {
    return {
        scope: {
            submit: "="
        },
        link: function (scope, element, attributes) {
            element.bind("submit", function (loadEvent) {
                return scope.submit(loadEvent);
            });
        }
    }
}]);

---

<form submit="sendForm" method="post" action="/sign_up">

---

$scope.sendForm = function(e) {
  if ($scope.whatever)
      return true;
  else
      return false;
};