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angularjs - Can I trigger a form submit from a controller?

I'd like to do a traditional form submit from within a controller. The scenario is that I want to hit a route on my web server and redirect to its response, which I can do with a regular form in HTML, but I also want to do some validation on its fields when the submit button is pressed, and if the validation fails, I don't want to do the route.

I'm aware of ng-valid, but I only want the validation to take place when the button is hit.

Is there a way to conditionally do a form submit from within a controller?

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You can add submit method to a FormController. I did so:

<form ng-form-commit action="/" name='payForm' method="post" target="_top">
    <input type="hidden" name="currency_code" value="USD">
    <button type='button' ng-click='save(payForm)'>buy</button>
</form>

.directive("ngFormCommit", [function(){
    return {
        require:"form",
        link: function($scope, $el, $attr, $form) {
            $form.commit = function() {
                $el[0].submit();
            };
        }
    };
}])

.controller("AwesomeCtrl", ["$scope", function($scope){
   $scope.save = function($form) {
     if ($form.$valid) {
         $form.commit();
     }
   };
}])

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