在調用方法填充細節網格之前，如何從填充的下拉列表中獲取信息？

Question

這樣做的正確方法是什麼？這裏是一個接一個的聲明，但由於JavaScript是異步我猜測$ score.lastItem不存在，當第二個函數被調用？那麼我是否將第二個函數放在第一個回調函數中？

//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

Yes.You可以做

//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; 
    }); 
});