only-numbers.js

angular.module('app')
    .directive('flOnlyNumber', function() {
        return {
            restrict: 'EA',
            require: 'ngModel',
            link: function(scope, element, attrs, ngModel) {
                scope.$watch(attrs.ngModel, function(newValue, oldValue) {
                    if (newValue) {
                        var spiltArray = String(newValue).split("");

                        if (attrs.isValid =="false"){
                            return false;
                        }else{
                            return true;
                        }

                        if (attrs.allowNegative == "false") {
                            if (spiltArray[0] == '-') {
                                newValue = newValue.replace("-", "");
                                ngModel.$setViewValue(newValue);
                                ngModel.$render();
                            }
                        }

                        if (attrs.allowDecimal == "false") {
                            newValue = parseInt(newValue);
                            ngModel.$setViewValue(newValue);
                            ngModel.$render();
                        }

                        if (attrs.allowDecimal != "false") {
                            //debugger;
                            if (attrs.decimalUpto) {


                                var splitChar = parseInt(newValue) && newValue.indexOf(',') > -1 ? ',' : '.'
                                var n = String(newValue).split(splitChar);

                               // var n = String(newValue).split(".");
                                if (n[1]) {
                                    var n2 = n[1].slice(0, attrs.decimalUpto);
                                    newValue = [n[0], n2].join(".");
                                    ngModel.$setViewValue(newValue);
                                    ngModel.$render();
                                }
                            }
                        }

                        if (spiltArray.length === 0) return;
                        if (spiltArray.length === 1 && (spiltArray[0] == '-' || (spiltArray[0] === '.' || spiltArray[0] === ','))) return;
                       // if (spiltArray.length === 1 && (spiltArray[0] == '-' || spiltArray[0] === '.')) return;
                        if (spiltArray.length === 2 && newValue === '-.') return;


                        /*Check it is number or not.*/
                        if (isNaN(newValue.replace(',', '.'))) {
                            ngModel.$setViewValue(oldValue || '');
                            ngModel.$render();
                        }
                    }
                });
            }
        };
    });