[GitHub] [royale-asjs] aharui commented on issue #507: Issue in dbzutil

[GitBox <gi...@apache.org>]

aharui commented on issue #507: Issue in dbzutil 
URL: https://github.com/apache/royale-asjs/issues/507#issuecomment-544739371
 
 
   The important part of your code is here
   
   ```
   		//Get Selected Row index of AdvancedDataGrid
   		public static function getSelRowIndex(dg:AdvancedDataGrid, aFieldName:String, aSelKey:String):uint {
   			var rowIndex:uint = 0;
   			if(aSelKey != null) {
   				var breakMainLoop:Boolean = false;
   				var dgDP:Object = dg.dataProvider;
   				var arrDGSelKey:Array = aFieldName.split("~");
   				var arrVOSelKey:Array = aSelKey.split("~");
   				var strDGSelKey:String = "";
   				var strVOSelKey:String = "";
   				for (var i:int = 0; i < arrVOSelKey.length; i++) {
   					strVOSelKey += arrVOSelKey[i] + "~";
   				}
   				strVOSelKey = strVOSelKey.indexOf('~') > -1 ? strVOSelKey.substring(0, (strVOSelKey.length)-1) : 
   					strVOSelKey;
   				if(dgDP != null) { 
   					for (var j:int = 0; j < dgDP.length; j++) {
   						for (var k:int = 0; k < arrDGSelKey.length; k++) {
   							strDGSelKey += dgDP[j][arrDGSelKey[k]] + "~";
   						}
   ```
   
   Because dgDP is declared as an Object,
   
   `var dgDP:Object = dg.dataProvider;`
   
   the compiler does not know it is an ArrayCollection requiring Proxy access.  In Flash it didn't matter, the Flash runtime would detect that the code is reading from a Proxy like ArrayCollection, but in the browser (without Flash) it does matter.  The JavaScript runtime does not know what a Royale Proxy is (at least, not now).
   
   So, if you get errors working with a Proxy like ArrayCollection, make sure the compiler knows you are working with an ArrayCollection.  Otherwise array access like `dgDP[j]`;
   
   IMO, the code to use should look more like:
   
   `var dgDP:ArrayCollection = dg.dataProvider as ArrayCollection;`
   

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