Re: How to populate data from Database in combo box using DropDownChoice
Hi, DropDownChoice works with simple java.util.List. See http://www.wicket-library.com/wicket-examples/compref/wicket/bookmarkable/org.apache.wicket.examples.compref.DropDownChoicePage for examples. It is up to you to read your data from the database (plain JDBC, Hibernate, ...) and create a List of your objects. On Tue, Mar 27, 2012 at 11:49 AM, lenin wrote: > Dear, > > I am trying to populate data from database in combo box using > dropdownChoice,with key and value ... > it is not working > can anyone help to resolve the problem > > thanks in advance > > -- > View this message in context: > http://apache-wicket.1842946.n4.nabble.com/How-to-populate-data-from-Database-in-combo-box-using-DropDownChoice-tp4508402p4508402.html > Sent from the Users forum mailing list archive at Nabble.com. > > - > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > -- Martin Grigorov jWeekend Training, Consulting, Development http://jWeekend.com - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: Combo Box (help!)
On 05/06/2010 09:44 PM, Brian Mulholland wrote:
> This is a second asking, so sorry if I am being impatient, but I was
> hoping to see a response to this.
>
> I've got a combo box with the list in a List of string arrays (code
> and decode). The bean has the currently selected code. I created a
> DropDownChoice with a custom ChoceRenderer as below. The CR interface
> is invoked for both the acquisition of the bean value and for each row
> of the list, which is why the below code checks the type of object
> coming in.
>
> This works great when displaying, but when the value comes back to the
> server, it is loaded back into the bean as
> "[Ljava.lang.String;@3c6f3c6f". It looks like the Object.toString().
> What am I doing wrong here?
>
The ChoiceRenderer is only used for the display of the options on the
page, not for saving. The IModel's setObject() is called then, which in
that case is the PropertyModel calling setId() on the bean, with the
current Object as argument. So you need to implement an IModel that's a
little more intelligent and basically does what the renderer does: pick
the first element if it's an array, the whole String otherwise.
>From a design point of view it looks like this logic should maybe be in
the bean, or at least in a helper class so you can use it from both the
Model and the ChoiceRenderer.
-- Thomas
> DropDownChoice ddc = new DropDownChoice(id, new PropertyModel(bean,
> id), listOfStringArrays, new IChoiceRenderer(){
>@Override
>public Object getDisplayValue(Object array) {
>if(array instanceof String)
>return (String) array;
>else if(array.getClass().isArray()){
>String[] result = (String[]) array;
>return result[1];
>}
>else
>throw new RuntimeException("Huh?");
>}
>
>@Override
>public String getIdValue(Object array, int arg1) {
>if(array instanceof String)
>return (String) array;
>else if(array.getClass().isArray())
>{
>String[] result = (String[]) array;
>return result[0];
>}
>else
>throw new RuntimeException("Huh?");
>}
> });
>
>
--
---
Thomas Kapplerthomas.kapp...@isb-sib.ch
Swiss Institute of Bioinformatics Tel: +41 22 379 51 89
CMU, rue Michel Servet 1
1211 Geneve 4
Switzerland http://www.uniprot.org
---
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Re: Combo Box (help!)
Try with
@Override
public String getIdValue(Object array, int arg1) {
return Integer.toString(arg1);
}
On Thu, 2010-05-06 at 15:44 -0400, Brian Mulholland wrote:
> This is a second asking, so sorry if I am being impatient, but I was
> hoping to see a response to this.
>
> I've got a combo box with the list in a List of string arrays (code
> and decode). The bean has the currently selected code. I created a
> DropDownChoice with a custom ChoceRenderer as below. The CR interface
> is invoked for both the acquisition of the bean value and for each row
> of the list, which is why the below code checks the type of object
> coming in.
>
> This works great when displaying, but when the value comes back to the
> server, it is loaded back into the bean as
> "[Ljava.lang.String;@3c6f3c6f". It looks like the Object.toString().
> What am I doing wrong here?
>
> DropDownChoice ddc = new DropDownChoice(id, new PropertyModel(bean,
> id), listOfStringArrays, new IChoiceRenderer(){
>@Override
>public Object getDisplayValue(Object array) {
>if(array instanceof String)
>return (String) array;
>else if(array.getClass().isArray()){
>String[] result = (String[]) array;
>return result[1];
>}
>else
>throw new RuntimeException("Huh?");
>}
>
>@Override
>public String getIdValue(Object array, int arg1) {
>if(array instanceof String)
>return (String) array;
>else if(array.getClass().isArray())
>{
>String[] result = (String[]) array;
>return result[0];
>}
>else
>throw new RuntimeException("Huh?");
>}
> });
>
>
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Re: Combo Box (help!)
[Ljava.lang.String;@HEX looks like you are stuffing an Array of Strings into
a String. So, it calls String[].toString() and stuffs that into your
String, like so... System.out.println(new String[] {"string", "array"});.
I'm not real familiar with the choice renderer, so I'm not sure how this
would happen when your string gets loaded back in to your model. Maybe
someone else has an idea?
Combo Box (help!)
This is a second asking, so sorry if I am being impatient, but I was
hoping to see a response to this.
I've got a combo box with the list in a List of string arrays (code
and decode). The bean has the currently selected code. I created a
DropDownChoice with a custom ChoceRenderer as below. The CR interface
is invoked for both the acquisition of the bean value and for each row
of the list, which is why the below code checks the type of object
coming in.
This works great when displaying, but when the value comes back to the
server, it is loaded back into the bean as
"[Ljava.lang.String;@3c6f3c6f". It looks like the Object.toString().
What am I doing wrong here?
DropDownChoice ddc = new DropDownChoice(id, new PropertyModel(bean,
id), listOfStringArrays, new IChoiceRenderer(){
@Override
public Object getDisplayValue(Object array) {
if(array instanceof String)
return (String) array;
else if(array.getClass().isArray()){
String[] result = (String[]) array;
return result[1];
}
else
throw new RuntimeException("Huh?");
}
@Override
public String getIdValue(Object array, int arg1) {
if(array instanceof String)
return (String) array;
else if(array.getClass().isArray())
{
String[] result = (String[]) array;
return result[0];
}
else
throw new RuntimeException("Huh?");
}
});
--
Brian Mulholland
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Combo Box
I've got a combo box with the list in a List of string arrays (code
and decode). The bean has the currently selected code. I created a
DropDownChoice with a custom ChoceRenderer as below. The CR interface
is invoked for both the acquisition of the bean value and for each row
of the list, which is why the below code checks the type of object
coming in.
This works great when displaying, but when the value comes back to the
server, it is loaded back into the bean as
"[Ljava.lang.String;@3c6f3c6f". It looks like the Object.toString().
What am I doing wrong here?
DropDownChoice ddc = new DropDownChoice(id, new PropertyModel(bean,
id), listOfStringArrays, new IChoiceRenderer(){
@Override
public Object getDisplayValue(Object array) {
if(array instanceof String)
return (String) array;
else if(array.getClass().isArray()){
String[] result = (String[]) array;
return result[1];
}
else
throw new RuntimeException("Huh?");
}
@Override
public String getIdValue(Object array, int arg1) {
if(array instanceof String)
return (String) array;
else if(array.getClass().isArray())
{
String[] result = (String[]) array;
return result[0];
}
else
throw new RuntimeException("Huh?");
}
});
--
Brian Mulholland
"One of the greatest delusions in the world is the hope that the evils
in this world are to be cured by legislation."
--Thomas B. Reed (1886)
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Re: Dynamic Combo box with adding list
add it to your list..? Edi wrote: hi, i have one empty combo box. how can i add one item in combo box at run time? please let me know. THANKS -- Nino Martinez Wael Java Specialist @ Jayway DK http://www.jayway.dk +45 2936 7684 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Dynamic Combo box with adding list
hi, i have one empty combo box. how can i add one item in combo box at run time? please let me know. THANKS -- View this message in context: http://www.nabble.com/Dynamic-Combo-box-with-adding-list-tp14250648p14250648.html Sent from the Wicket - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
