A directive to format phone number

Question

I was wondering how to automatically format a number in an input field using an angularjs directive? When I type in an input field say 6042919283 I want it to be shown as 6

Answer 1

Here is how I did it with a custom directive.

customDirective.js

demoApp.directive('phoneInput', [ '$filter', '$browser', function($filter, $browser) {
    return {
        require: 'ngModel',
        link: function($scope, $element, $attrs, ngModelCtrl) {
            var listener = function() {
                var value = $element.val().replace(/[^0-9]/g, '');
                $element.val($filter('tel')(value, false));
            };

            // This runs when we update the text field
            ngModelCtrl.$parsers.push(function(viewValue) {
                return viewValue.replace(/[^0-9]/g, '').slice(0,10);
            });

            // This runs when the model gets updated on the scope directly and keeps our view in sync
            ngModelCtrl.$render = function() {
                $element.val($filter('tel')(ngModelCtrl.$viewValue, false));
            };

            $element.bind('change', listener);
            $element.bind('keydown', function(event) {
                var key = event.keyCode;
                // If the keys include the CTRL, SHIFT, ALT, or META keys, or the arrow keys, do nothing.
                // This lets us support copy and paste too
                if (key == 91 || (15 < key && key < 19) || (37 <= key && key <= 40)){
                    return;
                }
                $browser.defer(listener); // Have to do this or changes don't get picked up properly
            });

            $element.bind('paste cut', function() {
                $browser.defer(listener);
            });
        }

    };
}]);

And using this custom filter you can filter the model.

customFilter.js

demoApp.filter('tel', function () {
    return function (tel) {
        console.log(tel);
        if (!tel) { return ''; }

        var value = tel.toString().trim().replace(/^\+/, '');

        if (value.match(/[^0-9]/)) {
            return tel;
        }

        var country, city, number;

        switch (value.length) {
            case 1:
            case 2:
            case 3:
                city = value;
                break;

            default:
                city = value.slice(0, 3);
                number = value.slice(3);
        }

        if(number){
            if(number.length>3){
                number = number.slice(0, 3) + '-' + number.slice(3,7);
            }
            else{
                number = number;
            }

            return ("(" + city + ") " + number).trim();
        }
        else{
            return "(" + city;
        }

    };
});

HTML

    
    
{{USPhone | tel}}