AngularJS - 一个简单的无限滚动

Question

我正在尝试写一个类似的小无限卷轴到这里找到的那​​个:http://jsfiddle.net/vojtajina/U7Bz9/

我已经能够显示前 5 条数据，但是在滚动时，没有显示其他项目。

HTML:

<div id="fixed" directive-when-scrolled="loadMore()">
  <ul>
    <li ng-repeat="i in items | limitTo: 5">{{ i.Title }}</li>
  </ul>  
</div>

JS:

var app = angular.module('app', []);

app.controller('MainCtrl', function($scope) {
  $scope.name = 'World';

  $scope.items = [
    {
       "Title":"Home"
    },
    {
       "Title":"Contact"
    },
    {
       "Title":"Help"
    },
    {
       "Title":"About"
    },
    {
       "Title":"Our Offices"
    },
    {
       "Title":"Our Locations"
    },
    {
       "Title":"Meet the Team"
    }
    ,
    {
       "Title":"Our Mission"
    },
    {
       "Title":"Join Us"
    },
    {
       "Title":"Conferences"
    },
    {
       "Title":"Tables"
    },
    {
       "Title":"Chairs"
    } 
  ];

    var counter = 0;
    $scope.loadMore = function() {
        for (var i = 0; i < 5; i++) {
            $scope.items.push({id: counter});
            counter += 10;
        }
    };

    $scope.loadMore();


});


app.directive("directiveWhenScrolled", function () {
  return function(scope, elm, attr) {
        var raw = elm[0];

        elm.bind('app', function() {
            if (raw.scrollTop + raw.offsetHeight >= raw.scrollHeight) {
                scope.$apply(attr.whenScrolled);
            }
        });
    };
});

这是一个plunker: http://plnkr.co/edit/6ggYGZx6scSoJ5PNhj67?p=preview

Answer 1

有两个问题。首先，什么是 attr.whenScrolled ？它的未定义。第二个 - limitTo: 5 。您将始终只显示 5 个元素!

这里有工作代码:http://plnkr.co/edit/VszvMnWCGb662azo4wAv?p=preview

改变了什么？您的指令称为 directiveWhenScrolled 所以调用:

scope.$apply(attr.directiveWhenScrolled);

代替

scope.$apply(attr.whenScrolled);

让我们如何处理静态限制。将其更改为变量(记住定义默认值):

<li ng-repeat="i in items | limitTo: limit">{{ i.Title }}</li>

现在你的 loadMore 函数应该是这样的:

$scope.loadMore = function() {
    $scope.limit += 5;
};