AngularJS：實現頁面滾動到底自動加載數據的功能

要實現這個功能，可以通過https://github.com/sroze/ngInfiniteScroll這個第三方控件來實現。步驟如下：

1. 下載ng-infinite-scroll.js程序http://sroze.github.io/ngInfiniteScroll/ 目前版本是1.0.0

2. 如果你是用的jQuery2.0以上版本，還需要修改ng-infinite-scroll.js程序，將所有的將所有的$window.xxx改為$(window).xxx, elem.xxx改為$(elem).xxx

3. 在HTML中引入script

<script type='text/javascript' src='path/to/jquery.min.js'></script>
<script type='text/javascript' src='path/to/angular.min.js'></script>
<script type='text/javascript' src='path/to/ng-infinite-scroll.min.js'></script>

4. HTML示例代碼如下：

<div ng-controller='PostListController'>
    <div infinite-scroll='demo.nextPage()' infinite-scroll-disabled='demo.busy' infinite-scroll-distance='1'>
        <div ng-repeat='item in demo.items'>
            <p>
                <input type="hidden" value="{{item.PostId}}" />
                <label>{{item.WriterName}}</label>
                <label>{{item.WriterMail}}</label>
                <label>{{item.WreckerName}}</label>
                <label>{{item.StartDate}}</label>
                <label>{{item.Location}}</label>
                <label>{{item.Story}}</label>
            </p>
        </div>
        <div ng-show='demo.busy'>Loading data...</div>
    </div>
</div>

5. PostListController.js代碼如下：

var ftitAppModule = angular.module('ftitApp', ['infinite-scroll']);

ftitAppModule.controller('PostListController', 
    function ($scope, Demo) {
        $scope.demo = new Demo();
});

// 創建后台數據交互工廠
ftitAppModule.factory('Demo', function ($http) {
    var Demo = function () {
        this.items = [];
        this.busy = false;
        this.after = '';
        this.page = 0;
    };
    
    Demo.prototype.nextPage = function () {
        if (this.busy) return;
        this.busy = true;
        
        var url = "http://192.168.3.95:7002/api/post/nextpage?id=" + this.page + "&callback=JSON_CALLBACK";
        $http.jsonp(url).success(function (data) {
            var items = data;
            for (var i = 0; i < items.length; i++) {
                this.items.push(items[i]);
            }
            this.after = "t3_" + this.items[this.items.length - 1].id;
            this.busy = false;
            this.page += 1;
        }.bind(this));
    };

    return Demo;
});

這樣就實現了頁面拖動到底后，從服務器自動加載數據的功能。