Re: Adding Objects to an ArrayList (Checkboxes)
Re: Adding Objects to an ArrayList (Checkboxes)
- Subject: Re: Adding Objects to an ArrayList (Checkboxes)
- From: Janice Cheung <email@hidden>
- Date: Mon, 10 Oct 2005 19:07:10 -0400
Hi Ken,
Here are the bindings for my repetition on the first page, UserHome.wo:
Repetition 2:WORepetition{
item=server;
list=m_ServersA;
}
CheckBox2: WOCheckBox{
checked=objectSelected;
}
Here are my bindings for my next page, EmailServerContacts.wo:
Repetition1:WORepetition{
item= server;
list=selectedObjects;
}
I called the method, nextPage.setSelectedObjects(selectedObjects());
as you suggested, but it still isn't working.
When I do setAllServersTrue, my servers are being passed correctly over:
public WOComponent setServersTrue(){
UserHome nextPage=(UserHome)pageWithName(UserHome);
nextPage.fetchByDnsName();
nextPage.setSelectedObjects(m_ServersA);
return nextPage;
}
What am I doing incorrectly?
Thanks for helping me..
Janice
Ken Anderson wrote:
Janice,
First off, please reply-all so others on the list can see the progress.
You shouldn't access the ivar, just call the method:
nextPage.setSelectedObjects(selectedObjects());
Unfortunately, that won't change anything if setObjectSelected() is
not being called. Can you send us the bindings for the repetition
and the checkbox? You can find them in the .wod file.
Ken
On Oct 10, 2005, at 6:36 PM, Janice Cheung wrote:
Ken,
Am I doing my selectedObjects array incorrectly?
public WOComponent EmailServerContacts(){
EmailServerContacts nextPage= (EmailServerContacts)pageWithName
("EmailServerContacts");
nextPage.setSelectedObjects(_selectedObjects);
nextPage.setIsSingle(false);
return nextPage;
}
It doesn't seem like setObjectSelected is ever called to
addObjects or removeObjects. What am I doing wrong?
I tried putting nextPage.setSelectedObjects(selectedObjects) but
it gives an error message.
Thanks for helping me!
Janice
Ken Anderson wrote:
Janice,
If all the checkboxes are checked, there must be something wrong.
From looking at David's code, you shouldn't do anything with
selectedObjects, it will be created lazily. Here are a few thoughts:
- Make sure the entire repetition is in the same form as the
submit button. If you have more than one submit button, make sure
multiple submit is set to true.
- Make sure 'objectSelected' is bound to 'checked', and not
something else (a common mistake).
Lastly, in the objectSelected() method, I would put a debug print
statement to make sure that it's being called for each item in
your source list. Then, setObjectSelected should only be called
for the items that were checked.
Ken
On Oct 10, 2005, at 5:04 PM, Janice Cheung wrote:
Ken,
I created two different arrays, but selectedObjects (even with
the checkboxes checked) is always returning an empy
array. I placed the objectSelected checkbox within my source
object array repetition. What am I doing wrong?
Thanks for helping me!
Janice
Ken Anderson wrote:
Janice,
The selected objects and the source objects should be 2
different arrays. If you don't want any checked,
selectedObjects should be an empty NSMutableArray. Your
repetition should be bound to your original set of server objects.
After the form is submitted, the selectedObjects array should
contain the server objects that the user put a check next to.
Ken
On Oct 10, 2005, at 4:48 PM, Janice Cheung wrote:
Hi David,
I'm having a bit of trouble implementing the "magic" you
provided for me.
On this particular page load, I run a fetch specification
to initialize an array for all Server objects. I set
this array equal to NSMutableArray _selectedObjects, but
this seems to complicate the array of selectedObjects
so that regardless of which checkboxes I check, all Server
objects are always selected.
What am I doing incorrectly? Regardless of how I tweak,
all Server objects are always set as selected (and the
objectSelected is always "true").
Thanks so much for all of your help!
Best regards,
Janice
David LeBer wrote:
Repeat after me Janice... "Let WebObjects do the heavy lifting"
:-)
First: I don't recommend adding public ivars to your EO's to
track state. That's mucks with MVC separation.
Second: In general you'll find most WebO apps use the
Foundation classes ie: NSArray, NSMutableArray instead of
standard Java data structures. Amongst other things, they
respond to KVC which can be very helpful.
Third: To answer your question. I'm assuming you have a
repetition on the page with a checkbox that you hope will be
associated with each item. When you click on a
performSomeActionWithTheSelectedObjects() action some magic
should happen with the items that have their selection
checked. Correct?
If so, try building the array like this:
protected NSMutableArray _selectedObjects;
public MyObjectInTheRepetition item;
// accessors
public NSMutableArray selectedObjects() {
// lazy initialization, alternately initialize the array
in the component
// constructor.
if (_selectedObjects == null) {
_selectedObjects = new NSMutableArray();
}
return _selectedObjects;
}
public void setSelectedObjects(NSMutableArray newArray) {
_setSelectedObjects = newArray;
}
// now the magic, bind the checked binding of your WOCheckbox
// to objectSelected the accessors are below, notice there is *no*
// ivar. The value of objectSelected is dynamic.
// when checking to see if the checkbox should display as
checked if the
// selectedObjects array contains the current lines item,
return true;
public boolean objectSelected() {
return selectedObjects().containsObject(item);
}
// when reading the values of the checkbox, add or remove the
item where
// appropriate
public boolean setObjectSelected(boolean value) {
if (value) {
if (! selectedObjects().containsObject(item)) {
selectedObjects().addObject(item);
}
} else {
if (selectedObjects().containsObject(item)) {
slectedObjects().removeObject(item);
}
}
}
Now you have an array of the selectedObjects. Do with them
what you will (assign them to the next page, whatever)
Hope that helps.
On 7-Oct-05, at 5:14 PM, Janice Cheung wrote:
Ken,
I call addServer() when I click on an
"EmailServerContacts" button, to bring all the servers
clicked to the next page.
I will also have it to set the ArrayList for
downloadable reports (a collection of server data for all
server checkboxes clicked).
Basically the nextPage contains all the server contact
information for all the servers clicked (basically for
Server Broadcast emails).
Here is my EmailServerContacts() function (I just wanted
to confirm that serverIsCheckedList was retrieving data):
public WOComponent EmailServerContacts(){
EmailServerContacts nextPage=(EmailServerContacts)
pageWithName("EmailServerContacts");
addServer();
return nextPage;
}
Prior to the checkbox functionality request, my
EmailServerContacts() function basically just set one Server
object
for the next page.
public WOComponent EmailServerContacts(){
EmailServerContacts nextPage=(EmailServerContacts)
pageWithName("EmailServerContacts");
nextPage.setServerGroup(serverDisplayGroup);
nextPage.setServer(server);
return nextPage;
}
I do not quite know how I'll extract the server
attributes from the ArrayList yet ... (probably set an
array to the arraylist?)
but I figured I would think about that after making sure
my "serverIsChecked" ArrayList contained some data.
What do you think I am doing wrong?
Thanks for responding to me.. I really appreciate it.
Best regards,
Janice
Ken Anderson wrote:
Janice,
What are you trying to do exactly? I understand you have a
page, and it seems like you have a list of servers on the
page with checkboxes next to them. Is that correct?
Is addServer an action? At what point are you trying to
get the list of checked servers?
Ken
On Oct 7, 2005, at 4:52 PM, Janice Cheung wrote:
Greetings,
I am using an ArrayList to add server items for all
servers that have a boolean isChecked value equal to true.
I am using a WORepetition to display a list of
"m_Servers", with "server" object items.
I added the following to my Server class:
public boolean isChecked;
public boolean isChecked(){
return isChecked;
}
I use a fetch specification to populate the
WORepetition with an "m_Servers" list binding and a
"server" item binding.
Repetition1:WORepetition{
item=server;
list=m_Servers;
}
CheckBox1: WOCheckBox{
checked=server.isChecked;
}
I am aiming to provide the functionality where, when a
Server item in the WORepetition is checked, it is added to
a ArrayList named "serverIsCheckedList". This
ArrayList will enable me to retrieve all the server
attributes for
all servers checked. However, my ArrayList is showing
null and no items are being added to my ArrayList. What
am I doing wrong?
This is my addServer function:
public void addServer(){
for (Iterator it=m_Servers().iterator();it.hasNext();)
{
Server s=(Server)it.next();
if((s.isChecked==true))
{
serverIsCheckedList.add(s);
NSLog.out.appendln("=========here is my
serverIsCheckedList=========="+serverIsCheckedList);
}
}
}
What am I doing incorrectly? Am I iterating through
the m_Servers array properly? No servers are being added
to my
serverIsCheckedList and no items are being printed out
from my NSLog.out.appendln.
I would really appreciate any advice or guidance. I
am tearing my hair out. Thanks for helping me.
Best regards,
Janice
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--
;david
--
David LeBer
"I am codeferous!"
Codeferous Software
site: http://www.codeferous.com
blog: http://david.codeferous.com
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