angular FormController validation - angularjs

Question

I have this html form:
<div class="modal-body">
<form name="addAdminForm">
<div class="form-group addPopupLabel">
<div class="container-fluid-full" id="email3">
<input placeholder="Email" type="text" ng-model="model.email" required />
</div>
<div class="container-fluid-full">
<input placeholder="Password (at last 6 characters)" type="password" ng-model="model.password1" id="pw1" name="pw1" required />
</div>
<div class="container-fluid-full">
<input placeholder="Confirm password" type="password" ng-model="model.password2" id="pw2" name="pw2" required password-compare="pw1" />
</div>
<div class="container-fluid-full">
<label>Admin</label>
<input type="radio" class="form-control" name="role" ng-model="model.role" ng-value="userRoles.admin">
</div>
<div class="container-fluid-full">
<label>CS</label>
<input type="radio" class="form-control" name="role" ng-model="model.role" ng-value="userRoles.cs">
</div>
<div>
<span class="errormessage" style="color:red">{{errormessage}}</span>
</div>
</div>
</form>
</div>
<div class="modal-footer">
<button class="btn btn-primary" ng-disabled="addAdminForm.$invalid" ng-click="createForm.$invalid || ok()">Submit</button>
<button class="btn btn-warning" ng-click="cancel()">Cancel</button>
</div>
The problem: button stay on disable mode while one of the fields is on focus.
How can i solve it by FormController?

Answer 1

The addAdminForm is scoped within the form. So one option is to move the buttons within the form, or move the form element so that it wraps the buttons. I would prefer this since it is dead simple and most times doable.
If it is not possible for some reason, you can make a directive to export the $invalid flag of a form to a variable of the outer scope. A simple implementation would be:
app.directive('bindValidity', ['$parse', function($parse) {
return {
restrict: 'A',
scope: false,
controller: ['$scope', '$attrs', function($scope, $attrs) {
var assign = $parse($attrs.bindValidity).assign;
if (!angular.isFunction(assign)) {
throw new Error('the expression of bindValidity is not settable: ' + $attrs.bindValidity);
}
this.setFormController = function(formCtrl) {
if (!formCtrl) {
throw new Error('bindValidity requires one of <form> or ng-form');
}
$scope.$watch(
function () {
return formCtrl.$invalid;
},
function (newval) {
assign($scope, newval);
}
);
};
}],
require: ['?form', '?ngForm', 'bindValidity'],
link: function (scope, elem, attrs, ctrls) {
var formCtrl, bindValidity;
formCtrl = ctrls[0] || ctrls[1];
bindValidity = ctrls[2];
bindValidity.setFormController(formCtrl);
}
};
}]);
Use it as:
<div class="modal-body">
<form name="addAdminForm" bind-validity="some.variable">
...
</form>
<div class="modal-footer">
<button ... ng-disabled="some.variable" ng-click="some.variable || ok()">Submit</button>