Hi mahesh213,
Check this example. Now please take its reference and correct your code.
HTML
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.5/angular.js"></script>
<script type="text/javascript">
var app = angular.module('MyApp', [])
app.controller('MyController', function ($scope, $window) {
$scope.Save = function () {
var number = $scope.Number;
var numberArray = [];
if (number.length == 4) {
var array = ("" + number).split("");
var prevNumber;
for (var i = 0; i < array.length; i++) {
if (i == 0) {
numberArray.push(array[i]);
prevNumber = array[i];
} else {
var current = array[i];
if (prevNumber == (parseInt(current) - 1) || prevNumber == current
|| numberArray.indexOf(array[i]) !== -1) {
$window.alert('Invalid');
break;
}
numberArray.push(array[i]);
prevNumber = array[i];
}
}
} else {
$window.alert('Numbers should be 4 digit.');
}
}
});
</script>
</head>
<body ng-app="MyApp" ng-controller="MyController">
<input type="text" maxlength="4" ng-model="Number" />
<input type="button" ng-click="Save()" value="Save" />
</body>
</html>
Demo
