在调用填充详细信息网格的方法之前，如何从填充的下拉列表中获取信息？

Question

这样做的正确方法是什么？ 这是一个又一个的语句，但是由于javascript是异步的，我想在调用第二个函数时$ score.lastItem不存在？ 那么我是否将此第二个函数放在第一个的回调中？

 //1st Call this on inital load to populate Congresses dropdownlist
ccResource.query(function (data) {
    $scope.ccList.length = 0;
    angular.forEach(data, function (ccData) {
        $scope.ccList.push(ccData);
    })

    $scope.lastItem = $scope.ccList[$scope.ccList.length - 1];
});

//2nd after populating $scope.lastItem run this to populate grid on initial load (using id from selected item in dropdownlist)
cgResource.query({ id: $scope.lastItem.congressNumber }, function (data) {
    $scope.usersList = data;
});

//ngGrid
$scope.userGrid = {
    data: 'usersList',
    multiSelect: false,
    selectedItems: $scope.selectedUsers,
    enableColumnResize: false,
    columnDefs: [
        { field: 'firstname', displayName: 'First Name', width: '25%' },
        { field: 'lastname', displayName: 'Last Name', width: '25%' }
    ]
};

Answer 1

是的你可以

//1st Call this on inital load to populate Congresses dropdownlist
ccResource.query(function (data) {
    $scope.ccList.length = 0;
    angular.forEach(data, function (ccData) {
        $scope.ccList.push(ccData);
    })

    $scope.lastItem = $scope.ccList[$scope.ccList.length - 1];

    //2nd after populating $scope.lastItem run this to populate grid on initial load (using id from selected item in dropdownlist)
    cgResource.query({
        id: $scope.lastItem.congressNumber
    }, function (data) {
        $scope.usersList = data;
    });
});