[flexcoders] passing reference?

[freska]

Hi list,
Please review my code. I have no better words to explain my problem.


In the main file, I have this variable.

[Bindable]
public var arrayStep:ArrayCollection = new ArrayCollection();


In my component file, I define a DataGrid component using three
ComboBox as item editor. I need to pass that variable to one of them.
Here is the code. I mark the part with a comment.

<?xml version="1.0" encoding="utf-8"?>
<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml"; width="480"
height="336">
        <mx:Script>
                <![CDATA[
                        import mx.collections.ArrayCollection;
                        
                        // array untuk menyimpan data result (tabel)
                        [Bindable]
                        public var arrayStepResChild:ArrayCollection = new 
ArrayCollection();
                
/* This is not correct. */
                [Bindable]
                public var myArrayStep:ArrayCollection =
parentDocument.arrayStep;
                
                ]]>
        </mx:Script>
        
        <mx:Component id="goToEditor">
        <mx:ComboBox dataProvider="{outerDocument.myArrayStep}"
labelField="colLabel"/>
    </mx:Component>
        
        <mx:Component id="timeEditor">
        <mx:ComboBox dataProvider="{arrayTime}" labelField="time">
                <mx:Script>
                        <![CDATA[
                                import mx.collections.ArrayCollection;
                                        [Bindable]
                                        public var arrayTime:ArrayCollection = 
new
ArrayCollection([{time:"immediately"}, {time:"1 hour"}, {time:"1
day"}, {time:"1 week"}]);
                        ]]>
                </mx:Script>    
        </mx:ComboBox>
    </mx:Component>
    
    <mx:Component id="roleEditor">
        <mx:ComboBox dataProvider="{arrayRole}" labelField="role">
                <mx:Script>
                        <![CDATA[
                                        import mx.collections.ArrayCollection;
                                        [Bindable]
                                        public var arrayRole:ArrayCollection = 
new
ArrayCollection([{role:"Employee"}, {role:"Manager"}, {role:"HR
Admin"}, {role:"Finance"}]);
                        ]]>
                </mx:Script>    
        </mx:ComboBox>
    </mx:Component>
        
        <mx:Canvas width="100%" height="100%" minHeight="256">
                <mx:Button id="btnAddStepResult" x="20" y="10" label="New"
click="addStepResult()"/>
                <mx:Button id="btnSaveStepResult" x="78" y="10" label="Save"/>
                <mx:Button id="btnRemoveStepResult" x="140" y="10" 
label="Delete"
click="removeStepResult()"/>
                                
                <mx:DataGrid id="dataGridResult" x="20" y="40" width="428"
height="110" sortableColumns="false" 
                        dataProvider="{arrayStepResChild}" editable="true"
draggableColumns="false">
                        <mx:columns>
                                <mx:DataGridColumn headerText="Result" 
dataField="colResult"/>
                                <mx:DataGridColumn headerText="Go to" 
dataField="colGoTo"
itemEditor="{goToEditor}"/>
                                <mx:DataGridColumn headerText="Time" 
dataField="colTime"
itemEditor="{timeEditor}"/>
                                <mx:DataGridColumn headerText="Assigned to" 
dataField="colRole"
itemEditor="{roleEditor}"/>
                        </mx:columns>
                </mx:DataGrid>
        </mx:Canvas>
                
</mx:HBox>


Flex said, "Error #1009: Cannot access a property or method of a null
object reference." I've tried to fill the arrayStep with initial
value, but it also throws the same error message. Please give me a
clue on this.

TIA,
Freska