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Simple question: hows to dynamically reference a class object

Posted on 2011-03-16
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Last Modified: 2012-08-14
Hi i  need a little help as my brain has gone dark on me :-)

i have the below object backupCartItem (simplified)

and i have a function which needs to reference different properties within the different contained objects.

public function createEndorcementItem( propertyClass:String, propertyName:String ):void
{
var val:* = backupCartItem[ propertyClass ][ propertyName ];
trace( val.toString();
}

public function doSomething():void
{
createEndorcementItem( 'sessionVO.primaryInsurie', 'AGE_NOW');
}


the above little script example should set val to being
backupCartItem.sessionVO.primaryInsurie.AGE_NOW

but it throws an error

Property sessionVO.primaryInsurie not found on com.travins.cairngorm.model.CartItemVO

how can i dynamically reference the object please






      backupCartItem      com.travins.cairngorm.model.CartItemVO (@70bd781)      
            admin_fee      0      
            id      1174 [0x496]      
            sessionVO      com.travins.cairngorm.model.CurrentSessionVO (@27a2881)      
                  ADULT_COUNT      1      
                  CHILD_COUNT      0      
                  primaryInsurie      com.travins.cairngorm.model.InsurieVO (@1fa5dc1)      
                        AGE_AT_START_TIME      40 [0x28]      
                        AGE_ERROR      ""      
                        AGE_IS_VALID      true      
                        AGE_NOW      40 [0x28]      
                        COUNTRY_ID      1      
                        DATE_OF_BIRTH      Date (@71dbcd1)      
0
Comment
Question by:cghrmauritius
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7 Comments
 
LVL 29

Accepted Solution

by:
dgofman earned 2000 total points
ID: 35149658
Hi,
You mixed in your code setter and getter that reason why you confused yourself.
Check if this what you want:

private var backupCartItem:Object;

			public function createEndorcementItem( propertyClass:String, propertyName:String, value:*):void
			{
				if(backupCartItem == null)
					backupCartItem = {};
				if(backupCartItem[propertyClass] == undefined)
					backupCartItem[propertyClass] = {};
				backupCartItem[propertyClass][propertyName] = value;
			}
			
			public function getEndorcementItem( propertyClass:String, propertyName:String ):void
			{
				var val:* = backupCartItem[propertyClass][propertyName];
				trace( val.toString());
			}
			
			public function doSomething():void
			{
				createEndorcementItem( 'sessionVO.primaryInsurie', 'AGE_NOW', 25);
				getEndorcementItem( 'sessionVO.primaryInsurie', 'AGE_NOW');
			}

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0
 

Author Comment

by:cghrmauritius
ID: 35149839
humm no sorry i needed it the other way round im not trying to set the value im trying to get the value of

backupCartItem[ propertyClass ][ propertyName ]

i know there is a value cause if i query it manually as

backupCartItem.sessionVO.primaryInsurie.AGE_NOW  i do ge the cirrect value but i cant get it when using the square brackets

any ideas please
0
 

Author Comment

by:cghrmauritius
ID: 35150016
i see yuor example does work, i must have something wrong with my backupcartItem but i dont understand why because i can get the value if done manually

thanks i will assign you the points

thanks for your time
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Author Closing Comment

by:cghrmauritius
ID: 35150021
Thanks
0
 

Author Comment

by:cghrmauritius
ID: 35150077
Actually if checked in debuger your example isnt right im afraid

backupCartItem      Object (@8cb9421)      
      sessionVO.primaryInsurie      Object (@8cb93f9)      
            AGE_NOW      25 [0x19]      


as per my original which is what my object dump looks like

backupCartItem      com.travins.cairngorm.model.CartItemVO (@70bd781)      
             sessionVO      com.travins.cairngorm.model.CurrentSessionVO (@27a2881)      
                   primaryInsurie      com.travins.cairngorm.model.InsurieVO (@1fa5dc1)      
                        AGE_IS_VALID      true      
                        AGE_NOW      40 [0x28]      

please notice that in your example the primaryInsurie object isnt nested inside sessionVO

0
 

Author Comment

by:cghrmauritius
ID: 35150262
ok i have found a solution finally your comment gave me an idea which worked so thanks for the pointers


here is my solution but im sure its a dirty method and that there must be a cleaner way!!!

public function createEndorcementItem( propertyClass:String, propertyName:String ):void
{
	var arr:Array = propertyClass.split(".");
				
	var cur:Object;
	cur = backupCartItem;
				
	for each (var a:String in arr)
	{
		cur = cur[a];
	}
	var val:* = cur[propertyName];
}

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LVL 29

Expert Comment

by:dgofman
ID: 35150302
I am very happy to know I helped you.
Regards,
David
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