Javascript Paging Library using AngularJS and Lazy

directives.html

<!-- STEP 1: Add This Script Markup to your Page.. This is the Template for the Pager -->
<!-- Pager Markup -->
<script id="od-pager.html" type="text/ng-template">
    <ul class="pagination" ng-show="links().length > 1">
        <li><a ng-click="prev()">&laquo;</a></li>
        <li ng-class="{active:isCurrentPage(item)}" ng-repeat="item in links()"><a ng-click="goto(item)">{{item + 1}}</a></li>
        <li><a ng-click="next()">&raquo;</a></li>
    </ul>
</script>

directives.js

/*
*  STEP 4:
*  This creates the Pager Directive to encapsulate paging functionality
*  It depends on the PagedList class
*/
app.directive("odPager", function () {
    var dir = {
        restrict: "EAC",
        templateUrl: "od-pager.html",
        scope: {
            page: "="
        },
        controller: function ($scope) {
            $scope.next = function () {
                $scope.page.NextPage();
                console.log("Next Clicked: " + $scope.page.Items().length);
            };

            $scope.prev = function () {
                $scope.page.previousPage();
            };

            $scope.goto = function (index) {
                $scope.page.Goto(index + 1);
            };

            $scope.links = function () {
                var page = $scope.page;
                if (page) {
                    return _.range(page.TotalPages()).toArray();
                }
                return [];
            };

            $scope.isCurrentPage = function (item) {
                return $scope.page.CurrentPage() == item + 1;
            };
        }
    };
    return dir;
});

index.html

<!-- 
 STEP 5:
 Simply add the following markup to where you want a pager to show up on your page
-->

<!-- This will loop through all the items in the current page -->
<ul>
    <li ng-repeat="item in pagedlist.Items()">{{item}}</li>
</ul>

<div od-pager page="pagedlist" />

index.js

// Step 6:
// Now we need to create pagelist and attach it to the $scope

app.controller(function($scope){
    var allitems = ["bag","shoe","umbrella","glasses","wristwatches","hats"];
    $scope.pagedlist = new PagedList(allitems,3); //Create a pagelist with three items per page 
});

pagedlist.js

/**
 *  STEP 2:  Add LazyJS (http://danieltao.com/lazy.js/) to your page.
 *  
 *  STEP 3: Add The remaining code to the code where you created your angular application.
 *  Its usually an app.js file also replace "app" with whatever name you called your angular module
 */
var _ = Lazy;

var PagedList = (function () {
    function PagedList(all, itemsPerPage) {
        //Set Default Items per page to 10 to prevent Division by Zero
        if (!itemsPerPage || itemsPerPage <= 0)
            itemsPerPage = 10;

        this.page = 1;
        this.itemCount = itemsPerPage;
        this.allItems = all;

        this.pages = Math.floor(all.length / itemsPerPage);
        if (all.length % itemsPerPage > 0)
            this.pages++;
    }
    PagedList.prototype.NextPage = function () {
        if (this.page < this.pages) {
            this.page++;
        }
    };

    PagedList.prototype.CurrentPage = function () {
        return this.page;
    };

    PagedList.prototype.previousPage = function () {
        if (this.page > 1) {
            this.page--;
        }
    };

    PagedList.prototype.Goto = function (page) {
        if (page > 0 && page <= this.pages) {
            this.page = page;
        }
    };

    PagedList.prototype.Count = function () {
        return this.allItems.length;
    };

    PagedList.prototype.Items = function () {
        return _(this.allItems).skip((this.page - 1) * this.itemCount).take(this.itemCount).toArray();
    };

    PagedList.prototype.Add = function (el) {
        this.allItems.push(el);
    };

    PagedList.prototype.Remove = function (el) {
        var index = this.allItems.indexOf(el);
        if (index > -1) {
            this.allItems.splice(index, 1);
        }
    };

    PagedList.prototype.Clear = function () {
        this.allItems.length = 0;
    };

    PagedList.prototype.TotalPages = function () {
        return this.pages;
    };
    return PagedList;
})();

I don't understand the code to be honest.. :(

Sorry about that, I should have added some kind of documentation.. I have updated it accordingly

I have split the code so that it makes a little bit more sense. Hope you find it useful