Re: DropDownChoice with Model for data and HashMap of key/values

[Steve Swinsburg]

Oh yeah I didn't mean the admins if that what you were referring to in the '5 of us', I just thought maybe more of a community input, like other development mailing lists I'm a part of. But anyway, solution found!

cheers,
Steve


On 15 Dec 2008, at 15:49, Igor Vaynberg wrote:

On Mon, Dec 15, 2008 at 6:02 AM, Steve Swinsburg
<s.swinsb...@lancaster.ac.uk> wrote:

After a fresh start on a Monday, I figured out how to use a Hashmap in a DropDownChoice component when separate id/display values are required. I was hoping to get a bit more of an explicit answer from the community on this one though, since I was completely stumped, which is what I thought this

mailing list was for.

keep in mind that there are 5 of us and 400 of you. i believe i gave
you more then enough of a push in the right direction to solve the
problem. and looks like you did.

-igor

Anyway, its solved:

final LinkedHashMap preferences = new LinkedHashMap();
preferences.put("0", "some choice");
preferences.put("1", "some other choice");
preferences.put("2", "and another choice");


IModel dropDownModel = new Model() {
public Object getObject() {
   return new ArrayList(preferences.keySet());
}
};


DropDownChoice profileChoice = new DropDownChoice("preference",
dropDownModel, new IChoiceRenderer() {

public String getDisplayValue(Object object) {
 return preferences.get(object);
}

public String getIdValue(Object object, int index) {
  return object.toString();
}
});

I am using a CompoundPropertyModel for my form where the CPM has the

DDC.
Hopefully this will help others.
cheers,
Steve




On 12 Dec 2008, at 18:39, Igor Vaynberg wrote:

that map needs to be in the choicerenderer. your domain model type is
integer, ddc<integer> looks like this:


choices, ichoicerenderer<integer> renderer)

-igor

On Fri, Dec 12, 2008 at 10:36 AM, Steve Swinsburg
<s.swinsb...@lancaster.ac.uk> wrote:

Thanks.

I now have this:

IModel dropDownModel = new Model() {

protected Object load() {

preferences.put(0, "some choice");

preferences.put(1, "some other choice");

preferences.put(2, "and another choice");

return  preferences; //get the HashMap

}

};



new IChoiceRenderer() {



public String getDisplayValue(Object object) {

return  preferences.get(object);

}

public String getIdValue(Object object, int index) {

return object.toString();

}

});







'Choices' model empty?


I can feel I'm close but what have I missed?



cheers,

Steve





On 12 Dec 2008, at 18:14, Igor Vaynberg wrote:

new ichoicerenderer<integer>() {

Object getDisplayValue(integer object) {

return choices.get((integer)object);

}

String getIdValue(integer object, int index) {

return object.tostring();

}

}

-igor


On Fri, Dec 12, 2008 at 9:46 AM, Steve Swinsburg

<s.swinsb...@lancaster.ac.uk> wrote:

Hi all,





being an Integer.

ie

public class UserPreferences {

int preferenceOne;

int preferenceTwo

constructor

getters and setters for the ints above

}









ie

LinkedHashMap choices = new LinkedHashMap()

choices.put("43", "Something");

choices.put("64", "Something else");

choices.put("87", "blah");

which should render the select list as:

<select name="preferenceOne">

<option value="43">Choice Something</option>

<option value="64">Choice Something else</option>

<option value="87">blah</option>

<select>





database.



different data models etc.





models/data as above.



thanks,

Steve



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property 'preference', so no need to explicitly tie the two together in the dropdownchoice(string id, imodel<integer> model, imodel<list<integer>> DropDownChoice profileChoice = new DropDownChoice("profile", dropDownModel, where my Form is given a CompoundPropertyModel with one of the parameters being "profile". But, I'm getting an error about my choices being null. java.lang.NullPointerException: List of choices is null - Was the supplied I've been over all the DDC examples but am still stumped by this one. I have a model (pojo) which holds user preferences, the preference for each item I now want to render a form that has a DDC for each of the preferences in my model. The list of choices that needs to go into the DDC should come from a HashMap or similar (in reality it will come from a database) because I want to store the number attached to the item selected, not the display string. When clicking submit, the value (ie 43) should be attached to the relevant item in the Model (ie preferenceOne would be 43), then I can save it to the Everything I've tried with ChoiceRenderer etc seems to get mixed up with the Can someone please present a snippet of code on how to do this, I'm at my wits end. I cannot for the life of me find any explicit info separating the

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