我正在使用angularjs.在MVC4中工作。我想执行分页和排序。 下面是示例代码
**Angularjs part**
=======
function ctrlRead($scope, $filter) {
// init
$scope.sortingOrder = sortingOrder;
$scope.reverse = false;
$scope.filteredItems = [];
$scope.groupedItems = [];
$scope.itemsPerPage = 5;
$scope.pagedItems = [];
$scope.currentPage = 0;
$scope.items = [
{"id":"1","name":"name 1","description":"description 1","field3":"field3 1","field4":"field4 1","field5 ":"field5 1"},
{"id":"2","name":"name 2","description":"description 1","field3":"field3 2","field4":"field4 2","field5 ":"field5 2"},
{"id":"3","name":"name 3","description":"description 1","field3":"field3 3","field4":"field4 3","field5 ":"field5 3"},
{"id":"4","name":"name 4","description":"description 1","field3":"field3 4","field4":"field4 4","field5 ":"field5 4"},
{"id":"5","name":"name 5","description":"description 1","field3":"field3 5","field4":"field4 5","field5 ":"field5 5"},
{"id":"6","name":"name 6","description":"description 1","field3":"field3 6","field4":"field4 6","field5 ":"field5 6"},
{"id":"7","name":"name 7","description":"description 1","field3":"field3 7","field4":"field4 7","field5 ":"field5 7"},
{"id":"8","name":"name 8","description":"description 1","field3":"field3 8","field4":"field4 8","field5 ":"field5 8"},
{"id":"9","name":"name 9","description":"description 1","field3":"field3 9","field4":"field4 9","field5 ":"field5 9"},
{"id":"10","name":"name 10","description":"description 1","field3":"field3 10","field4":"field4 10","field5 ":"field5 10"},
{"id":"11","name":"name 11","description":"description 1","field3":"field3 11","field4":"field4 11","field5 ":"field5 11"},
{"id":"12","name":"name 12","description":"description 1","field3":"field3 12","field4":"field4 12","field5 ":"field5 12"},
{"id":"13","name":"name 13","description":"description 1","field3":"field3 13","field4":"field4 13","field5 ":"field5 13"},
{"id":"14","name":"name 14","description":"description 1","field3":"field3 14","field4":"field4 14","field5 ":"field5 14"},
{"id":"15","name":"name 15","description":"description 1","field3":"field3 15","field4":"field4 15","field5 ":"field5 15"},
{"id":"16","name":"name 16","description":"description 1","field3":"field3 16","field4":"field4 16","field5 ":"field5 16"},
{"id":"17","name":"name 17","description":"description 1","field3":"field3 17","field4":"field4 17","field5 ":"field5 17"},
{"id":"18","name":"name 18","description":"description 1","field3":"field3 18","field4":"field4 18","field5 ":"field5 18"},
{"id":"19","name":"name 19","description":"description 1","field3":"field3 19","field4":"field4 19","field5 ":"field5 19"},
{"id":"20","name":"name 20","description":"description 1","field3":"field3 20","field4":"field4 20","field5 ":"field5 20"}
];
var searchMatch = function (haystack, needle) {
if (!needle) {
return true;
}
return haystack.toLowerCase().indexOf(needle.toLowerCase()) !== -1;
};
// init the filtered items
$scope.search = function () {
$scope.filteredItems = $filter('filter')($scope.items, function (item) {
for(var attr in item) {
if (searchMatch(item[attr], $scope.query))
return true;
}
return false;
});
// take care of the sorting order
if ($scope.sortingOrder !== '') {
$scope.filteredItems = $filter('orderBy')($scope.filteredItems, $scope.sortingOrder, $scope.reverse);
}
$scope.currentPage = 0;
// now group by pages
$scope.groupToPages();
};
// calculate page in place
$scope.groupToPages = function () {
$scope.pagedItems = [];
for (var i = 0; i < $scope.filteredItems.length; i++) {
if (i % $scope.itemsPerPage === 0) {
$scope.pagedItems[Math.floor(i / $scope.itemsPerPage)] = [ $scope.filteredItems[i] ];
} else {
$scope.pagedItems[Math.floor(i / $scope.itemsPerPage)].push($scope.filteredItems[i]);
}
}
};
$scope.range = function (start, end) {
var ret = [];
if (!end) {
end = start;
start = 0;
}
for (var i = start; i < end; i++) {
ret.push(i);
}
return ret;
};
$scope.prevPage = function () {
if ($scope.currentPage > 0) {
$scope.currentPage--;
}
};
$scope.nextPage = function () {
if ($scope.currentPage < $scope.pagedItems.length - 1) {
$scope.currentPage++;
}
};
$scope.setPage = function () {
$scope.currentPage = this.n;
};
// functions have been describe process the data for display
$scope.search();
// change sorting order
$scope.sort_by = function(newSortingOrder) {
if ($scope.sortingOrder == newSortingOrder)
$scope.reverse = !$scope.reverse;
$scope.sortingOrder = newSortingOrder;
// icon setup
$('th i').each(function(){
// icon reset
$(this).removeClass().addClass('icon-sort');
});
if ($scope.reverse)
$('th.'+new_sorting_order+' i').removeClass().addClass('icon-chevron-up');
else
$('th.'+new_sorting_order+' i').removeClass().addClass('icon-chevron-down');
};
};
ctrlRead.$inject = ['$scope', '$filter'];
HTML part
===========
<html xmlns:ng="http://angularjs.org" ng-app lang="en">
<head>
<meta charset="utf-8">
<link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.1/css/bootstrap.no-icons.min.css" rel="stylesheet">
<link href="http://netdna.bootstrapcdn.com/font-awesome/2.0/css/font-awesome.css" rel="stylesheet">
<script src="http://code.angularjs.org/1.1.0/angular.min.js"></script>
</head>
<body>
<script type="text/javascript">
var sortingOrder = 'name';
</script>
</div>
<div ng-controller="ctrlRead">
<div class="input-append">
<input type="text" ng-model="query" ng-change="search()" class="input-large search-query" placeholder="Search">
<span class="add-on"><i class="icon-search"></i></span>
</div>
<table class="table table-striped table-condensed table-hover">
<thead>
<tr>
<th class="id">Id <a ng-click="sort_by('id')"><i class="icon-sort"></i></a></th>
<th class="name">Name <a ng-click="sort_by('name')"><i class="icon-sort"></i></a></th>
<th class="description">Description <a ng-click="sort_by('description')"><i class="icon-sort"></i></a></th>
<th class="field3">Field 3 <a ng-click="sort_by('field3')"><i class="icon-sort"></i></a></th>
<th class="field4">Field 4 <a ng-click="sort_by('field4')"><i class="icon-sort"></i></a></th>
<th class="field5">Field 5 <a ng-click="sort_by('field5')"><i class="icon-sort"></i></a></th>
</tr>
</thead>
<tfoot>
<td colspan="6">
<div class="pagination pull-right">
<ul>
<li ng-class="{disabled: currentPage == 0}">
<a href ng-click="prevPage()">« Prev</a>
</li>
<li ng-repeat="n in range(pagedItems.length)"
ng-class="{active: n == currentPage}"
ng-click="setPage()">
<a href ng-bind="n + 1">1</a>
</li>
<li ng-class="{disabled: currentPage == pagedItems.length - 1}">
<a href ng-click="nextPage()">Next »</a>
</li>
</ul>
</div>
</td>
</tfoot>
<tbody>
<tr ng-repeat="item in pagedItems[currentPage] | orderBy:sortingOrder:reverse">
<td>{{item.id}}</td>
<td>{{item.name}}</td>
<td>{{item.description}}</td>
<td>{{item.field3}}</td>
<td>{{item.field4}}</td>
<td>{{item.field5}}</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
在这个示例代码中，他们获得了所有项目并执行了分页等操作。但我的问题是，如果我在数据库中有超过15000个项目，那么我无法获得所有记录一次作为性能观点需要时间。那么我怎样才能实现分页和排序的最佳方法。
答案 0 :(得分：1)
您需要进行服务器端分页。由于您使用的是EF，因此可以使用linq来分页数据。创建一个类似
的方法PagedResult<User> GetPagedData(int pageNo, int pageSize) {
int total=dbContext.Users.Count();
List<Users> users = dbContext
.Users
.Skip(pageSize * pageNo)
.Take(pageSize).ToList();
return new PagedResult<User>() {
Items=users,
TotalRecords:total
};
}
如果您需要排序和过滤，则需要在执行Skip和Take之前执行此操作。动态linq可以帮助您http://weblogs.asp.net/scottgu/dynamic-linq-part-1-using-the-linq-dynamic-query-library