XPages: Access a datasource from one custom control in another one

On stackoverflow.com, a very interesting question was asked: How can you access a document datasource from one custom control in another custom control. And here comes my solution in a small SSJS function.

First you have to add an id to the custom control which contains the datasource. This gives you a handle for other custom controls:

<xc:ccDS1 id="idDSComponent"></xc:ccDS1>

Now it is possible to get the custom control by using the SSJS function getComponent(). The datasources are stored in the data attribute of the custom control. You just have to iterate through them and check every entry for the name you are looking for.

And here is the code snippet to access the datasource in another custom control:

/***
 * getDatasource
 * Resolves a datasource from a custom control
 * 
 * @param componentId    id of the component containing the datasource
 * @param dsName    name of the datasource in the component
 * @author Sven Hasselbach
 */
 function getDatasource( componentId:String, dataSourceName:String ):com.ibm.xsp.model.domino.DominoDocumentData {
    try{
       var data:java.util.ArrayList = getComponent( componentId ).getAttributes().get("data");
       if( data == null )
          return null;
                    
       var it:java.util.Iterator = data.iterator();
       var obj = null;
       while( it.hasNext() ){
          obj = it.next();
          if( obj.getVar() == dataSourceName )
             return obj;
       }
    }catch(e){
       print( e );
    }
}

To use the function you have to use it like this:

getDatasource( "idDSComponent", "document1" )

Here is the link to the original question: How to get document datasource in another Custom Control?