Angularjs 'in' filter in ng-options

Question

我的选择框是ng-repeat as，

<tr ng-repeat="project in projects | filter:filter">
    <td>
        <select class="form-control" ng-model="project.roleIds" ng-options= "role.id as role.name for role in roleList " multiple></select>
    </td>
<td>
    <select class="form-control" ng-model="project.company" ng-options= "obj.id as obj.name for obj in compnayList | filter:{roleId:project.roleIds}"></select>
    </td>
</tr>

我的roleId选择是多个，所以我想在选择角色时过滤公司列表下拉列表。所以如果我选择两个角色，那么有任何角色的公司都会在下拉框中出现。现在，如果我只选择一个角色，那么它会过滤它，但不会过滤多个角色。我能在ng-options中通过角过滤器做到这一点吗?自定义过滤器可以工作吗?

$scope.companyList=[{
    id:1,
    name:"ABC",
    roleId:1
},
{
    id:2,
    name:"ABCd",
    roleId:2
},
{
    id:3,
    name:"ABCgh",
    roleId:1
}];

$scope.roleList=[{
    id:1,
    name:"Grade A",
},
{
    id:2,
    name:"Grade B",
},
{
    id:3,
    name:"Grade C",
}];

项目列表是这样的，

$scope.projects=[{
    id:100,
    projectName:"Project 1", 
    roleIds: [1,2],
    company:1
},
....
];

Answer 1

查看这里如何使用过滤器http://dojo.telerik.com/EmoQu

 <input type='text' ng-model='roleId' placeholder='role id'>
 <select class="form-control" ng-model="project.available" ng-options= 'obj.id as obj.name for obj in [{id:1,name:"ABC",roleId:1},     {id:2,name:"ABCd",roleId:2},{id:3,name:"ABCgh",roleId:1}] | filter:roleId'

Answer 2

使用比较器:

$scope.in = function (items, value) {
    return items.indexOf(value) !== -1;
};

html:

<select class="form-control" ng-model="project.available"
ng-options="obj.id as obj.name for obj in compnayList | filter:{roleId:project.roleIds}:in">
</select>