On Mon, Dec 15, 2008 at 6:02 AM, Steve Swinsburg
<[email protected]> 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
> property 'preference', so no need to explicitly tie the two together in 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:
>
> dropdownchoice(string id, imodel<integer> model, imodel<list<integer>>
> choices, ichoicerenderer<integer> renderer)
>
> -igor
>
> On Fri, Dec 12, 2008 at 10:36 AM, Steve Swinsburg
> <[email protected]> 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
>
> }
>
> };
>
> DropDownChoice profileChoice = new DropDownChoice("profile", dropDownModel,
>
> new IChoiceRenderer() {
>
>
>
> public String getDisplayValue(Object object) {
>
> return preferences.get(object);
>
> }
>
> public String getIdValue(Object object, int index) {
>
> return object.toString();
>
> }
>
> });
>
> 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
>
> '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
>
> <[email protected]> wrote:
>
> Hi all,
>
> 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
>
> being an Integer.
>
> ie
>
> public class UserPreferences {
>
> int preferenceOne;
>
> int preferenceTwo
>
> constructor
>
> getters and setters for the ints above
>
> }
>
> 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.
>
> 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>
>
> 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
>
> database.
>
> Everything I've tried with ChoiceRenderer etc seems to get mixed up with the
>
> different data models etc.
>
> 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
>
> models/data as above.
>
>
>
> thanks,
>
> Steve
>
>
>
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