Re: [flexcoders] Re: Flex 1.5 - n checkboxes

[JesterXL]

I agree; wrapping my head around Repeater has been very tough; it's so much easier to create either a cellRenderer that does what you want in a List, or just use createChild/destroyChild with a VBox.   ----- Original Message ----- From: Alon J Salant To: flexcoders@yahoogroups.com Sent: Tuesday, November 08, 2005 2:14 PM Subject: RE: [flexcoders] Re: Flex 1.5 - n checkboxes A high level comment that may help you to put your problem and solution in a different light   In our work with Flex I have found using a repeater to be a “bad smell” worth looking in to. Usually, replacing a repeater with a List and CellRenderer cleans things up immensely and enables componentization of your solution including easier event handling and data binding. Remember that a List is not necessarily a ComboBox or a DataGrid. We have found that many UI programming tasks decompose well into a List and CellRenderer.   Alon   From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of Richard Rodseth Sent: Wednesday, November 02, 2005 4:40 PM To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Re: Flex 1.5 - n checkboxes   No, my requirements are simple. An "Edit User" panel with checkboxes for all the roles the user has. I have the check boxes rendering as follows          <mx:Repeater id="rolesList" dataProvider="{allroles}">             <mx:CheckBox id="role" label="{rolesList.currentItem}" selected="{user.hasRole(rolesList.currentItem)}" />         </mx:Repeater> Now, I need to submit the form, and call user.setRoles() with an array of the the checked roles. Right now there roles are just strings, but they should probably be Role objects. Presumably I will need a submit handler that iterates over the checkboxes looking at their selected state and building the array of checked ones. I don't know how to do that yet, but I'm sure I can figure it out. It would be nifty if there was a more automatic way to do this. Thanks, Richard On 11/2/05, Brendan Meutzner <[EMAIL PROTECTED]> wrote: Hi Richard, I recently completed a project in which we had to dynamically build form selection elements based on different control types (eg. checkboxes, radio buttons, etc...).  The data model we worked with provided us with the string name of the control type to use, and the appropriate data structure to populate the control type(s).  Solution I came up with was to (as you mention you might have to do) create the form elements using actionscript, more specifically the createChild method.  I created a custom instance of each control type, and added some additional properties to it, the most important being the data property it needed to affect.  Inside the custom control, I had my change event directly modify the data property that was passed in. Because the reference was passed in, this essentially "bound" that change to the data model it came from.  Problem solved. Your requirements may be slightly different as it sounds like you already know what type of control you need to render.  In this case, I would imagine you could use a repeater tag and have it's children be the custom "check box" you're creating, and pass in the object property reference that needs to be changed. Hope this helps you... Brendan --- In flexcoders@yahoogroups.com, Richard Rodseth <[EMAIL PROTECTED]> wrote: > > Yes, as I mentioned, I am using the repeater tag. But the data provider for > it is the list of all possible roles. I'm interested in the process of > mapping the checked items to an array of objects (strings or value objects). > I'm guessing there's no way around using Actionscipt to populate the form > from the model and vice versa. > > - Richard > > On 11/2/05, Matt Chotin <[EMAIL PROTECTED]> wrote: > > > >  Check out the Repeater tag. > > > >   ------------------------------ > > > > *From:* flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] *On > > Behalf Of *Richard Rodseth > > *Sent:* Wednesday, November 02, 2005 9:07 AM > > *To:* flexcoders@yahoogroups.com > > *Subject:* [flexcoders] Flex 1.5 - n checkboxes > > > >  Is there a slick way to bind a variable number of checkboxes to an array > > of value objects in a data model? > > > > Example: user has an array of roles. Display a list of checkboxes > > I see how to use repeaters to render the checkboxes, but I'm unclear on > > the best way to capture the user selections. > > > > Thanks > > > > > > > >  -- > > Flexcoders Mailing List > > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > > Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com > > > > > >  ------------------------------ > > YAHOO! GROUPS LINKS > > > > > >    - Visit your group "flexcoders<http://groups.yahoo.com/group/flexcoders>" > >    on the web. > >     - To unsubscribe from this group, send an email to: > >   [EMAIL PROTECTED]< [EMAIL PROTECTED]> > >     - Your use of Yahoo! Groups is subject to the Yahoo! 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