[flexcoders] Re: Date Fields and Data Binding.

[jsscardinal]

Well I am not sure I understand your meaning sorry. 

When the selectedObject instance on the model has a date member
variable that is blank, the field starts blank, but once the the field
changes, but not the instance, that text never leaves the date field.
It does it however when I use text or label boxes that have null
string member variables. So I dont understand why the date field is
working so differently. 


Jeremy

--- In flexcoders@yahoogroups.com, Steve Hindle [EMAIL PROTECTED] wrote:

 Just a guess here - I just use vanilla Flex
 Sounds like the field is not being assigned.  Since the field starts
out as
 blank in your model,
 and your selecting another model with a blank field - perhaps Flex is
 'short-circuiting' the
 assignment.
 
 I've noticed that for an assignment like foo = bar, Flex always
seems to
 call the getter for foo,
 _before_ calling the setter.  I can only surmise this it to allow it to
 short circuit the assignment
 if foo = bar already.
 
 So in your case, blank == blank, and no assignment is done, hence no
event
 fires ?
 
 
 On 12/6/06, jsscardinal [EMAIL PROTECTED] wrote:
 
I am attempting to do something I thought was pretty simple.
Using the
  cairngorm model, basically I have a data instance object attached to
  the model, and it has a Data Object attached to it.
 
  So think of it this way. I am running an application that tracks a
  list of canidates. So there is a CanidateVO actionscript object, and
  it has a member variable attached to it called interview date, and its
  of type Date.
 
  I am running a java backend retrieving these using spring and
  hybernate, and the conversion works fine.
 
  The problem I am having is with data binding in a grid and details
  panel. The grid has an array collection which is attached to the
  model, and that array contains a list of all the canidates, some that
  have dates and some that dont. All have member variables, but since
  all instances have not interviewed they may not have a value in the
  date field, thus those member vars are null.
 
  So the problem is that when I have a particular grid object selected,
  I see the details of that canidate in the details panel, which is just
  a panel that contains text fields and a dateField component. Well all
  the other bindings are working fine, but not the dateField binding.
 
  I have set the dateFields text bound to the attribute of the object,
  and that does not work, and I have set the dataProvider and that does
  not work, and I have even set a data attribute on the dateField and
  that does not work.
 
  Whats happening is, when I am looking at a particular canidate without
  an interview date, and I select the dateField, then put a date in it
  and DONT save the record but go to a different instance on the grid,
  all the fields are updated except the dateField. The dateField text
  remains there regardless of the fact that the selectedItem has
  changed, and the new selectedItem has no date in it.
 
  Conversly if I select a canidate who does have a date, the date is
  displayed, but once I go to one without a date, the date stays in the
  field. Why is data binding not working for dates?
 
  Please help.
 
  Jeremy.
 
   
 

[flexcoders] Re: Dot notation to access objects inside a datagrid column

[jsscardinal]

I encountered this same thing before. The solution is to use a
labelfunction. 

Like this:

Here is the grid column.
mx:DataGridColumn headerText=Port Country
labelFunction=myLabelFunction /


Here is the function which should reside inside the Script tag:

private function myLabelFunction(item:Object, col:DataGridColumn) : String
  {
return item.userGroup.name;
  }

Give this a try. 

Jeremy Sanders
Cardinal Solutions Group.
[EMAIL PROTECTED]

--- In flexcoders@yahoogroups.com, Niko Schmuck [EMAIL PROTECTED]
wrote:

 Hi FlexCoders:
 
 Coming from a Java background, I was surprised that the dot operator is
 not working as I expected.
 
 The array with the data structure and children is populated from the 
 (Hibernate) data source at creationComplete time with:
 
   ds.fill(users, all.users, []);
 
 The array collection is declared via:
 
   mx:ArrayCollection id=users /
 
 and then used inside the datagrid ...
 
   mx:DataGrid id=dgrid dataProvider={users} editable=false
 mx:columns
 mx:DataGridColumn headerText=User ID dataField=id/
 mx:DataGridColumn headerText=First Name
dataField=firstName/
 mx:DataGridColumn headerText=Last Name dataField=lastName/
 mx:DataGridColumn headerText=Group dataField=userGroup.name/
 /mx:columns
   /mx:DataGrid
 
 Unfortunately the dot-access to the related user group name seems not to
 work, there is just nothing being displayed. If
dataField=userGroup then
 there is [object UserGroup] displayed inside the datagrid column.
 
 So how do you retrieve the properties of the related user group object?
 
 Thanks for your help,
 Niko
 
 
 PS: The classes for value objects look very straight-forward:
 
 // User.as
 package com.example.flex
 {
 
 [Managed]
 [RemoteClass(alias=com.example.flex.User)]
 
 public class User
 {
 
 public var id:Number;
 public var firstName:String = ;
 public var lastName:String = ;
 public var userGroup:UserGroup;
 
 public function User() {
 }
 
 }
 }
 
 
 // UserGroup.as
 package com.example.flex
 {
 
 [Managed]
 [RemoteClass(alias=com.example.flex.UserGroup)]
 
 public class UserGroup
 {
 
 public var id:Number;
 public var name:String = ;
 
 public function UserGroup() {
 }
 
 }
 }

[flexcoders] Date Fields and Data Binding.

[jsscardinal]

I am attempting to do something I thought was pretty simple. Using the
cairngorm model, basically I have a data instance object attached to
the model, and it has a Data Object attached to it. 

So think of it this way. I am running an application that tracks a
list of canidates. So there is a CanidateVO actionscript object, and
it has a member variable attached to it called interview date, and its
of type Date. 

I am running a java backend retrieving these using spring and
hybernate, and the conversion works fine. 

The problem I am having is with data binding in a grid and details
panel. The grid has an array collection which is attached to the
model, and that array contains a list of all the canidates, some that
have dates and some that dont. All have member variables, but since
all instances have not interviewed they may not have a value in the
date field, thus those member vars are null. 

So the problem is that when I have a particular grid object selected,
I see the details of that canidate in the details panel, which is just
a panel that contains text fields and a dateField component. Well all
the other bindings are working fine, but not the dateField binding. 

I have set the dateFields text bound to the attribute of the object,
and that does not work, and I have set the dataProvider and that does
not work, and I have even set a data attribute on the dateField and
that does not work. 

Whats happening is, when I am looking at a particular canidate without
an interview date, and I select the dateField, then put a date in it
and DONT save the record but go to a different instance on the grid,
all the fields are updated except the dateField. The dateField text
remains there regardless of the fact that the selectedItem has
changed, and the new selectedItem has no date in it. 

Conversly if I select a canidate who does have a date, the date is
displayed, but once I go to one without a date, the date stays in the
field. Why is data binding not working for dates? 

Please help.

Jeremy.