Restrict input as numbers on input fields using AngularJS

Question

I am trying to restrict input as numbers on below fields

Postal Code:
<input type="text" id="zipCode1" name="zipCode1" size="4" maxlength="5" ng-model="zipCode1" ng-change="myNumbers(zipCode1)" />
<input type="text" id="zipCode2" name="zipCode2" size="3" maxlength="4" ng-model="zipCode2" ng-change="myNumbers(zipCode2)" />

it doesn't work with

$scope.myNumbers = function(fieldName){
var tN = fieldName.replace(/[^\d]/g, "");
    if(tN != fieldName)
    fieldName = tN
};

It works with below code but changing both the fields

$scope.$watch('myNumbers', function() {
var tN = $scope.myNumbers.replace(/[^\d]/g, "");
    if(tN != $scope.myNumbers)
    $scope.myNumbers = tN;
})

Need to change the value for the input field where user is typing and not both

use data-ng-model instead of ng-model .. and it validates automatically. you should not call any function i guess — bring2dip, Jan 29 '14 at 13:36
hi refer mentioned link: http://stackoverflow.com/questions/16091218/angularjs-allows-only-numbers-to-be-typed-into-a-text-box i think its help to you.. — Karthi Shan, Jan 29 '14 at 13:43
You should read the angular documentation on [form validation](http://docs.angularjs.org/api/ng.directive:form). There you will learn how angular validate fields using CSS. — Edwin Dalorzo, Jan 29 '14 at 13:45
@Edwin Dalorzo 'ng-change' is getting called but the value is not getting assigned using 'fieldName = tN' — Hamed Ali Khan, Jan 29 '14 at 13:46

score 4 · Accepted Answer · edited May 23 '17 at 12:30

4

Use the directive found here: https://stackoverflow.com/a/19675023/149060 instead of the ng-change function. Replicated here for easy reference:

angular.module('app').
  directive('onlyDigits', function () {

    return {
        restrict: 'A',
        require: '?ngModel',
        link: function (scope, element, attrs, ngModel) {
            if (!ngModel) return;
            ngModel.$parsers.unshift(function (inputValue) {
                var digits = inputValue.split('').filter(function (s) { return (!isNaN(s) && s != ' '); }).join('');
                ngModel.$viewValue = digits;
                ngModel.$render();
                return digits;
            });
        }
    };
});

edited May 23 '17 at 12:30

Community

1
1

answered Jan 29 '14 at 13:49

Pauli Price

4,187
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What's the IE8 behavior? Is it missing something that can be added as a shim? – Pauli Price Jan 29 '14 at 14:13
It is taking characters as well where as in other browsers it is taking only digits, any idea? – Hamed Ali Khan Jan 29 '14 at 14:17
Probably related to this behavior difference in split: http://stackoverflow.com/a/6425425/149060 - maybe modify the split().join() line into separate statements? – Pauli Price Jan 29 '14 at 14:31
1

I changed one line of code and it works in all the browsers, `var digits = inputValue.split('').filter(function (s) { return (!isNaN(s) && s != ' '); }).join('');` to `var digits = inputValue.replace(/[^\d]/g, "");` – Hamed Ali Khan Jan 30 '14 at 04:29

score 2 · Answer 2 · answered Jan 29 '14 at 13:37

2

You could try adding to the inputs

ng-pattern='/^\d{2}$/'

answered Jan 29 '14 at 13:37

TestersGonnaTest

1,017
2
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7

Although, that would not prevent you from entering numbers. That would simply mark the field as invalid when the wrong input is given. – Edwin Dalorzo Jan 29 '14 at 13:39
@EdwinDalorzo - You're so right! ng-pattern is a bit misleading to beginners. – Davis Aug 25 '14 at 18:01

ragnar · Answer 3 · 2016-11-17T14:54:57.720

Here is a directive I've done to restrict the keys allowed.

angular.module('app').directive('restrictTo', function() {
    return {
        restrict: 'A',
        link: function (scope, element, attrs) {
            var re = RegExp(attrs.restrictTo);
            var exclude = /Backspace|Enter|Tab|Delete|Del|ArrowUp|Up|ArrowDown|Down|ArrowLeft|Left|ArrowRight|Right/;

            element[0].addEventListener('keydown', function(event) {
                if (!exclude.test(event.key) && !re.test(event.key)) {
                    event.preventDefault();
                }
            });
        }
    }
});

And the input would look like:

<input type="text" name="zipCode1" maxlength="5" ng-model="zipCode1" restrict-to="[0-9]">

The regular expression evaluates the pressed key, not the value.

It also works perfectly with inputs type="number" because prevents from changing its value, so the key is never displayed and it does not mess with the model.

Restrict input as numbers on input fields using AngularJS

3 Answers3

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