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Angular Directive to Allow Decimal Numbers with a Single Dot (.)

In this example, we are determining if your input text-box already has a decimal point, if you want to prevent enter another decimals character in the same text-box.

After entered another decimal dot (.), the ASCII value will matches another entered decimal point in your text-box and remove if multiple entry .

Let's see the example -
app.directive('allowOnlyDecimalNumbers', function () {
    return {
        restrict: 'A',
        link: function (scope, elm, attrs, ctrl) {
            elm.on('keydown', function (event) {
                var $input = $(this);
                var value = $input.val();
                value = value.replace(/[^0-9\.]/g, '')
                var findsDot = new RegExp(/\./g)
                var containsDot = value.match(findsDot)

                if (containsDot != null && ([46, 110, 190].indexOf(event.which) > -1)) {
                    event.preventDefault();

                    return false;
                }

                $input.val(value);
                if (event.which == 64 || event.which == 16) {
                    // NUMBERS 
                    return false;
                }

                if ([8, 13, 27, 37, 38, 39, 40, 110].indexOf(event.which) > -1) {
                    // BACKSPACE, ENTER, ESCAPE, AND ARROWS 
                    return true;
                }
                else if (event.which >= 48 && event.which <= 57) {
                    // NUMBERS 
                    return true;
                }
                else if (event.which >= 96 && event.which <= 105) {
                    // NUMPAD NUMBER 
                    return true;
                }
                else if ([46, 110, 190].indexOf(event.which) > -1) {
                    // DOT AND NUMPAD DOT 
                    return true;
                }
                else {
                    event.preventDefault();
                    return false;
                }
            });
        }
    }
}); 

And use this directive in your HTML –
<input type="text" name="RateOfIntrest" class="form-control" allow-only-decimal-numbers />

I hope this example will helps you.
By Anil Singh | Rating of this article (*****)

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