Currency formatting in input

index.html

<input type="text" class="inputNumber" value="123456789" />
<input type="text" class="inputNumber" value="123456789" />
<button>click</button>

script.js

$(document).ready(function() {
    $('button').click(function(){
        $('input.inputNumber').each(function () {
            var value = $(this).val();
            if (!value || value.length == 0) {
                return value;
            }
            value = value.toString();
            value = value.replace(/[^0-9\.]/g, "");
            $(this).val(value);
        });
        
    });
    
    
    // on loading the form apply formatting
    $('input.inputNumber').each(function() {
        applyFormatting($(this));
    });
        function numberWithCommas(value, addExtraZeros) {
            if (addExtraZeros == undefined)
                addExtraZeros = false;
            value = value.toString();
            value = value.replace(/[^0-9\.]/g, "");
            var parts = value.split('.');
    
            if (parts.length > 0) {
                parts[0] = parts[0].replace(/\d{1,3}(?=(\d{3})+(?!\d))/g, "$&,");
                if (parts[1] && parts[1].length > 2) {
                    parts[1] = parts[1].substring(0, 2);
                }
                if (addExtraZeros && !parts[1]) {
                    parts[1] = "00";
                }
                else if (addExtraZeros && parts[1] && (parts[1].length === 1)) {
                    parts[1] = parts[1] + "0";
                }
                else if (!addExtraZeros && parts[1] && (parts[1] == "00")) {
                    parts.splice(1, 1);
                } else if (!addExtraZeros && parts[1] && (parts[1].length === 1)) {
                    parts[1] = parts[1] + "0";
                }
    
            }
            return parts.join(".");
        };
    
        function applyFormatting (element) {
            var value = element.val();
            var original = value;
            if (!value || value.length == 0) {
                return;
            }
            value = numberWithCommas(value);
            if (value != original) {
                element.val(value);
                element.triggerHandler('input');
            }
        };
        $('input.inputNumber').bind('keyup', function (event) {
            applyFormatting($(event.target));
        });
      

});