What if you used the ComboBox prompt
property instead and only set the selectedIndex if you have a real value?
It might avoid the change event firing there too.
Matt
From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of dwellet
Sent: Wednesday, June 22, 2005
1:43 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] bypass the
change event
I have this combobox.
The combobox is populated by a webservice.
When the webservice result arrives, I have a
utility function that
adds a 'Pick an item...' sort of option at the top
of the dropdown,
and then selects the appropriate selected
item. If there is no
appropriate selected item, it picks index 0 (the
dummy 'Pick an
item...').
I have a validator that validates that the
combobox has a real
selection.
The problem is... I want my utility function to
happen in stealth
mode. If the user changes the combobox, I want it
to be validated. But
if I programatically set the selectedIndex, I
don't want any events to
fire and trigger validation.
Ironically, I read that in Flex 1.0, changing the
selectedIndex did
not fire a change event, but this was fixed
in 1.5. The old behavior
is precisely what I want. Any way to temporarily
bypass that change
event firing?
Code included below... Thanks for your help!
-Tim.
[ComboBoxValidator.as]
import mx.controls.*;
import mx.validators.*;
/* ComboBoxValidator
*
* Validate that a user does not select the dummy
option (eg.
* 'Pick a value...') in a required combobox.
*
*/
class ComboBoxValidator extends Validator
{
public function
doValidation(foo:String) : Void
{
var n =
Number(foo);
if (n == 0)
{
validationError(noSelection, Field is required., null);
}
}
}
[Test.mxml]
mx:Application xmlns:mx=http://www.macromedia.com/2003/mxml
xmlns:dom=*
creationComplete=start()
mx:Script
![CDATA[
import
mx.controls.*;
import
mx.containers.*;
import
mx.managers.*;
import
mx.validators.*;
import
com.dom.sampling.vo.*;
var
model : SampleSite;
var
PICK_A_FACILITY_TYPE : FacilityType;
/*
start()
*
*
Perform basic setup.
*
*/
function start()
{
PICK_A_FACILITY_TYPE = new FacilityType();
PICK_A_FACILITY_TYPE.name = Choose a facility type...;
service.getAllFacilityTypes();
if (!model)
{
model = new SampleSite();
}
}
/*
prepareCombobox()
*
*
Prepares a combobox by adding a first, descriptive
*
option (eg. 'Pick a value...') to the dropdown. It
*
also sets the initial value of the combobox, either
*
to the item matching the passed in initialValue, or
*
if no match is found, to the first item in the
*
combobox.
*
*
@param combobox the combobox to prepare
*
*
@param pickAValue the first, descriptive option
*
(eg. 'Pick a value...') to add
*
to the combobox
*
*
@param initialValue the initialValue the combobox
*
should be set to
*/
public
function prepareComboBox(combobox: ComboBox,
pickAValue: Object,
initialValue: Object) : Void
{
if (pickAValue)
{
combobox.addItemAt(0, pickAValue);
combobox.selectedIndex = 0;
}
if (initialValue)
{
for (var i=0; i combobox.length; i++)
{
var item = combobox.getItemAt(i);
// object
if (item instanceof Object
item.id == initialValue.id)
{
combobox.selectedIndex = i;
}
// non-object
else if (item == initialValue)
{
combobox.selectedIndex = i;
}
}
}
}
]]
/mx:Script
mx:WebService
id=service
wsdl=/sampling-ws/services/LocationService?wsdl
showBusyCursor=true
mx:operation name=getAllFacilityTypes
result=prepareComboBox(facilityType,
PICK_A_FACILITY_TYPE,
model.facilityType)/
/mx:WebService
mx:Panel
title=Administer Sample Site width=100%
mx:FormItem width=100% required=true
label=Facility
Type
mx:ComboBox id=facilityType
dataProvider={service.getAllFacilityTypes.result}
labelField=name/
/mx:FormItem
/mx:Panel
mx:Model
id=validationModel
facilityType{facilityType.selectedIndex}/facilityType
/mx:Model
dom:ComboBoxValidator
required=true
field=validationModel.facilityType/
/mx:Application
--
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