angular currency format example

currency.js

app.directive('currency', function () {
    return {
        require: 'ngModel',
        link: function(elem, $scope, attrs, ngModel){
            ngModel.$formatters.push(function(val){
                return '$' + val
            });
            ngModel.$parsers.push(function(val){
                return val.replace(/^\$/, '')
            });
        }
    }
})

input.html

<input type="text" ng-model="price" currency>