Example of Reading Scope in Custom DIrective

HTML

<script src="http://code.angularjs.org/1.2.0-rc.2/angular.js"></script>
<div ng-app="testapp">
    <div ng-controller="testCtrlr">
       <input type= "text"  ng-modal="num" only-numbers>
    </div>
    
</div>

JavaScript

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

app.controller('testCtrlr',['$scope', function($scope){
  //console.log("controller called");
}]);

app.directive("onlyNumbers", function(){

    return {
   	   	require: '?ngModel',
        restrict: 'A',
        scope: {attributeVal: '=onlyNumbers'},
       
        link: function (scope, element, attrs, ngModelCtrl) {
        				if (!ngModelCtrl) {
                	return;
            		}
                debugger;
                ngModelCtrl.$parsers.push(function (input) {
                    if (input == undefined) return ''
                    var inputNumber = input.toString().replace(/[^0-9]/g, '');
                    if (inputNumber != input) {
                        ctrl.$setViewValue(inputNumber);
                        ctrl.$render();
                    }
                    return inputNumber;
                });
            }
    }
});