Tracy
The ComboBox dataProvider is set from a RemoteObject call that returns
an array of strings that are the unique "Platforms" in the database.
eg. SELECT Platform FROM theDB WHERE Platform IS NOT NULL ORDER BY
Platform
while ($row = fetchAssoc())
{ $platformsArray[] = $row['Platform'] }
return array_unique($platformsArray)
Further on in the code I get an ID from an event sent to this component.
I make a call on the database which returns an SDActionItem object (DTO)
that has two string fields and two int fields. One of the string fields
is the "Platform" that this SDActionItem object belongs to.
There is no reference between the ComboBox dataProvider and
SDActionItem.platform. The only correlation between them is that
SDActionItem.platform string is the same (textually) as one of the items
in the ComboBox dataProvider.
When I get this back I want to set the ComboBox selectedItem to this
string so I do:
platformComboBox.selectedItem = SDActionItem.platform;
This works but I don't know why (Other than it makes sense to me that it
should work this way).
I put together a little demo. Should it or shouldn't it work? As you can
see currentSelection is a string set to "Scotland" initially. There is
no reference to the comboBox dataprovider. When the comboBox is created,
its selectedItem is set to this string.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
layout="vertical">
<mx:Script>
<![CDATA[
import mx.controls.ComboBox;
private var currentSelection:String = "Scotland";
private var countryComboBox:ComboBox;
private function addCombo():void
{
countryComboBox = new ComboBox();
countryComboBox.dataProvider = countryAC;
countryComboBox.rowCount = countryAC.length;
countryComboBox.selectedItem = currentSelection;
countryFormItem.addChild(countryComboBox);
}
private function removeCombo():void
{
currentSelection =
countryComboBox.selectedItem.toString();
countryFormItem.removeChild(countryComboBox);
}
]]>
</mx:Script>
<mx:ArrayCollection id="countryAC">
<mx:String>United States</mx:String>
<mx:String>Australia</mx:String>
<mx:String>England</mx:String>
<mx:String>Ireland</mx:String>
<mx:String>Scotland</mx:String>
<mx:String>Wales</mx:String>
</mx:ArrayCollection>
<mx:Form>
<mx:FormItem id="countryFormItem" label="Country: "
fontWeight="bold"/>
</mx:Form>
<mx:Button label="Add Combo" click="addCombo()"/>
<mx:Button label="Remove Combo" click="removeCombo()"/>
</mx:Application>
--- In [email protected], "Tracy Spratt" <[EMAIL PROTECTED]> wrote:
>
> No, that should not work unless SDActionItem.platform is a reference
to
> an item in the ComboBox dataProvider.
>
>
>
> Tracy
>
>
>
>
>
>
>
> ________________________________
>
> From: [email protected] [mailto:[EMAIL PROTECTED]
On
> Behalf Of valdhor
> Sent: Wednesday, October 08, 2008 12:31 PM
> To: [email protected]
> Subject: [flexcoders] Re: ComboBox in Component won't open to Saved
> Value
>
>
>
> Tracy
>
> I must be missing something here.
>
> I have a combobox with a dataprovider of an arraycollection that is
> returned from a MySQL database. This is populated on creationcomplete.
> Once this arrayCollection is populated I make another call to get
> specific data. Part of this data is a field that corresponds to an
> item in the combobox.
>
> When the second call returns, all I do is:
>
> platformComboBox.selectedItem = SDActionItem.platform;
>
> SDActionItem is the DTO returned from the second call and platform is
> one of it's fields that correspond to an item in the combobox.
>
> This works every time and I do not have to loop through the data
> provider.
>
> Are you telling me that this should not work?
>
> --- In [email protected]
<mailto:flexcoders%40yahoogroups.com>
> , "Tracy Spratt" tspratt@ wrote:
> >
> > ComboBox.selectedItem will only work if you assign a *reference to
an
> > item in the ComboBox dataProvider*. This is rarely possible and is
not
> > in your case.
> >
> >
> >
> > What you must do is loop over the items in the CobmoBox.dataProvider
> and
> > compare the appropriate property's value to the value you want to
> match.
> > When a match is found, use the loop indes to set the ComboBox's
> > selectedIndex. This is simple enough to do in a one-off situation.
> >
> >
> >
> > If you need this often, then you might want to use an extended
> ComboBox.
> > Making a generic one is a bit tricky, because the Combo Box
> dataProvider
> > items can have any properties at all. I have an example on
> > www.cflex.net <http://www.cflex.net/ <http://www.cflex.net/> > (it
> allows you to set the data
> > field you want to match) and Ben forta has done one and there are
> > others.
> >
> >
> >
> > Tracy
> >
> >
> >
> > ________________________________
> >
> > From: [email protected]
<mailto:flexcoders%40yahoogroups.com>
> [mailto:[email protected]
<mailto:flexcoders%40yahoogroups.com>
> ] On
> > Behalf Of Dan Pride
> > Sent: Wednesday, October 08, 2008 10:01 AM
> > To: [email protected] <mailto:flexcoders%40yahoogroups.com>
> > Subject: [flexcoders] ComboBox in Component won't open to Saved
Value
> >
> >
> >
> > Hi
> > I have a ComboBox used as a Popup on a form component.
> > It saves fine using the following function
> >
> > private function closeGenderPop(event:Event):void {
> > ComboBox(event.target).selectedItem.label};
> >
> >
> > I want to have it display the stored value the next time it is
opened.
> > I tried this but no luck.
> >
> > private function openGenderPop(event:Event):void {
> > genderPop.selectedIndex = 1;
> > ComboBox(event.target).selectedItem.label; }
> >
> > Really appreciate the help
> >
> > Dan Pride
> >
>
