AngularJS Filter Out Select Option Based On Another Selection

Hello Angular experts, I have been banging my head for half of the day to make a list of selections where its options can be hide or disable based on other selections. This is the

Solution 1:

First of all, I extremely recommend you to use ngOptions instead of ngRepeat. ngOptions was made exactly for this kind of things.

Well, to achieve what you want I think the simplest way is to create a new property (which, in my solution, I called it as isAvailable - boolean -), then you can easily manipulate your items based on this property.

Take a look on my solution:

(function() {
  "use strict";
  angular.module('app', [])
    .controller('mainCtrl', function($scope) {
      $scope.roomAllocation = {  
         "dates":[  
            {  
               "date":"2016-07-16",
               "dayRooms":[  
                  {  
                     "room":1,
                     "occupancy":2,
                     "roomType":"Standard",
                     "availableRooms":[  
                        {  
                           "id":15,
                           "roomNumber":200
                        },
                        {  
                           "id":16,
                           "roomNumber":201
                        },
                        {  
                           "id":17,
                           "roomNumber":202
                        },
                        {  
                           "id":18,
                           "roomNumber":203
                        }
                     ]
                  },
                  {  
                     "room":2,
                     "occupancy":3,
                     "roomType":"Standard",
                     "availableRooms":[  
                        {  
                           "id":15,
                           "roomNumber":200
                        },
                        {  
                           "id":16,
                           "roomNumber":201
                        },
                        {  
                           "id":17,
                           "roomNumber":202
                        },
                        {  
                           "id":18,
                           "roomNumber":203
                        }
                     ]
                  }
               ]
            },
            {  
               "date":"2016-07-17",
               "dayRooms":[  
                  {  
                     "room":1,
                     "occupancy":2,
                     "roomType":"Standard",
                     "availableRooms":[  
                        {  
                           "id":15,
                           "roomNumber":200
                        },
                        {  
                           "id":16,
                           "roomNumber":201
                        },
                        {  
                           "id":17,
                           "roomNumber":202
                        },
                        {  
                           "id":18,
                           "roomNumber":203
                        }
                     ]
                  },
                  {  
                     "room":2,
                     "occupancy":1,
                     "roomType":"Standard",
                     "availableRooms":[  
                        {  
                           "id":15,
                           "roomNumber":200
                        },
                        {  
                           "id":16,
                           "roomNumber":201
                        },
                        {  
                           "id":17,
                           "roomNumber":202
                        },
                        {  
                           "id":18,
                           "roomNumber":203
                        }
                     ]
                  }
               ]
            }
         ]
      };

      // Function to set all rooms as available on initialization
      function set_availables() {
        $scope.roomAllocation.dates.forEach(function(date) {
          date.dayRooms.forEach(function(dayRoom) {
            dayRoom.availableRooms = dayRoom.availableRooms.map(function(avalRoom) {
              avalRoom.isAvailable = true;
              return avalRoom;
            });
          });
        });
      }

      set_availables();

      $scope.newRoomObject = {};

      // Fires on change of the select
      $scope.disable_room = function(dateIndex, roomIndex) {
        var currDate = $scope.roomAllocation.dates[dateIndex];
        // The current number room selected
        var selectedRoomNumber = $scope.newRoomObject[currDate.date][roomIndex + 1].roomNumber;

        // Setting property isAvaliable to true / false
        currDate.dayRooms.forEach(function(value, index) {
          if (index != roomIndex) {
            value.availableRooms = value.availableRooms.map(function(avalRoom) {
              avalRoom.isAvailable = avalRoom.roomNumber != selectedRoomNumber;
              return avalRoom;
            });
          }
        });
      }
    });
})();

div span {
  margin-right: 15px;
}

<html ng-app="app">

<head>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.7/angular.min.js"></script>
</head>

<body ng-controller="mainCtrl">
  <div ng-repeat="date in roomAllocation.dates track by $index">
    <div ng-repeat="rooms in date.dayRooms track by $index">
      <span ng-bind="date.date"></span> <span ng-bind="'Room ' + '#' + rooms.room"></span> <span ng-bind="rooms.roomType"></span> <span ng-bind="'Occ: ' + rooms.occupancy"></span>
      <span>
        <select ng-options="room as room.roomNumber for room in rooms.availableRooms | filter: { isAvailable: true }" ng-model="newRoomObject[date.date][rooms.room]" ng-change="disable_room($parent.$index, $index)">
          <option value="" disabled>Select Room</option>
        </select>
      </span>
    </div>
    <hr>
  </div>
</body>

</html>

Note: If you have any doubts you can ask me.

I hope it helps!!