External with DateField based ItemRenderer problem.

Hello Experts

I came across the 'problem' which I am not able to solve myself (I tried for the past 24 hours without success).

I'm building a medium-sized application that will use the DataGrid components in many modules. These components will extend with ItemRenderes to enhance the user experience (and allow the manipulation of data).


One of the DataGrids has a column with the date. This date field will be open user input.
The easiest thing would be to build inline ItemRenderer of type DateField, something to this effect:

< mx:DataGridColumn
ID = "someDateFld".
dataField = "someDateFld."
headerText = "sort of date."
itemRenderer = "mx.controls.DateField"
rendererIsEditor = "true".
editorDataField = "selectedDate" / >

And this works perfectly well.

However, I would like to be able to reuse ItemRenderers in my application and also send events (using the method of spread) that will trigger an additional feature is updated to another column with week number (read-only) based on the selected date. That's why I opted for external ItemRenderer.

I created ItemRenderer with 2 components: HBox to align the date field (otherwise it would be aligned to the left of the data grid column which looks weird to say) and DateField. I have my DateField selectedDate property-related data. First of all, I had to convert my string RFC service return value to the type expected for selectedDate which is the Date object. Now when I run my application and start click/changing DataGrid rows, I get a nasty error message:

ReferenceError: Error #1069: property selectedDate not found on ItemRenderers.DateFieldIR and there is no default value.
at mx.controls::DataGrid/itemEditorItemEditEndHandler() [E:\dev\4.x\frameworks\projects\frame work\src\mx\controls\DataGrid.as:5297]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent() [E:\dev\4.x\frameworks\projects\framework\src\mx\core \UIComponent.as:12528]
at mx.controls::DataGrid/endEdit() [E:\dev\4.x\frameworks\projects\framework\src\mx\controls\ DataGrid.as:4514]
at mx.controls::DataGrid/mouseDownHandler() [E:\dev\4.x\frameworks\projects\framework\src\mx\ controls\DataGrid.as:4790]

This message has no sense to me at all. As mentioned above, I linked my value (converted to date object) date the selectedDate property on my ItemRenderer (called: ItemRenderers.DateFieldIR).

Can someone please help me with this problem?

Concerning
Michael Orzechowski

I'm not sure what you mean by "disconnect", but it is generally interesting

practice to have "abstraction" and "encapsulation".  The model data for the

rendering engine has two important values: the data property that corresponds to the entry of

the collection element ArrayCollection and what you specified as

the editorDataField, in this case, "selectedDate", which came out of the

Editor and update the item in the collection ArrayCollection.

The converter is an encapsulation or abstraction so your work when you customize

is over these two values for the implementation correctly.

When the rendering engine was just a DateField, he did all of this wiring to

you, but now you buried inside a MXDGIR, so you need to proxy the

information to and from this thing.

There are several ways to code.  You can use two-way to data binding

bind the selectedDate of the MXDGIR to the DateField selectedDate.  You could

Implement the property selectedDate on MXDGIR like get that just works

readers of the DateField.  Then you wouldn't need to mess with events, but

in complex cases, you as events are sometimes necessary to warn others

things in the renderer property values to be updated.

Tags: Flex

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