pagination-pageNoChanged.js

$scope.pageNoChanged = function (value) {
    // evaluates what is your current situation and can page no be changed?
    if ($scope.currentPage === 1 && value < -1) {
        //console.log("you can't request page change");
        // if you are on FIRST page and requested FIRST page
        return;
    }
    else if ($scope.currentPage === $scope.lastPage && value > 1) {
        //console.log("you can't request page change");
        // if you are on LAST page and requested LAST page
        return;
    }
    else if ($scope.currentPage === 1 && value === -1) {
        //console.log("you can't request page change");
        // if you are on FIRST page and requested previous page
        return;
    }
    else if ($scope.currentPage === $scope.lastPage && value === 1) {
        //console.log("you can't request page change");
        // if you are on LAST page and requested next page
        return;
    }

    // evaluates what change in page no is requested?
    if (value > 1) {
        // if last page is requested
        $scope.currentPage = $scope.lastPage;
    }
    else if (value < -1) {
        // if first page is requested
        $scope.currentPage = parseInt(1);
    }
    else {
        // next or previous page are requested
        $scope.currentPage = parseInt($scope.currentPage) + parseInt(value);
    }

    var begin = (($scope.currentPage - 1) * $scope.pageSize.value);
    var end = begin + parseInt($scope.pageSize.value);

    if (parseInt(end) > $scope.originalItems.length) {
        // set the last item index to length of array
        end = $scope.originalItems.length;
    }

    $scope.items = $scope.originalItems.slice(begin, end);
};