Question

I have an ArrayCollection of objects used as the source for a HierarchicalData object. My object looks roughly like this:

ObjectName (String)
SubCollection (ArrayCollection)

I am using the HierarchicalData in an AdvancedDataGrid to display the data in a grouped format.

I am able to filter the data in the ArrayCollection using a filterFunction. What I want to do now is also filter the records in the SubCollection as well so that only the items that match the filter are displayed in the AdvancedDataGrid.

Can anyone tell me how I can filter the child rows in a HierarchicalData?

Answer 1

This answer isn’t a direct answer to your question, but it should help with some of the background. Essentially I am in the same position as you, where I need to show a specific data set depending on what type of parent node I have.

In this case, starting with an override to HierarchicalData.getChildren(node:Object):Object this will give you access to filter the first level children, and will also give you the ability to call a filtered method for sub-children to any n-th level.

You then use your extended class as the source to the ADG.

A pseudo-code example:

Class MyCollection extends HierarchicalData

override public function getChildren(node:Object):Object 
{
    if (node is a TopLevelObject)
        (node.children as ArrayCollection).filterFunction = filterSub;
        node.children.refresh();
    else if (node is a SubCollectionObject)
        (node.children as ArrayCollection).filterFunction = filterGrandChildren;
        node.children.refresh();

    // - OR -
        //a more complex process of allowing the sub-node to determine it's filter
        return node.filterSubCollectionGrandChildren();


    return node;
}