I don't understand that last post can you re phrase please.. -B
svenmeier wrote: > > Could it be that you slipped our CheckGroup/Check components? Cannot get > simpler than that. > > Sven > > GS-ikiini wrote: >> this part of the concept i understand...what i don't get is a little >> deeper...from your example i am accessing a property in input. however, I >> don't have such a property in my object. I some how have to figure out if >> that mode is selected. basically, i want to implement imodel as show in a >> example on the forum to put my object in a collection if it is selected. >> In >> the example ivan implements imodel. and set that model as the model that >> the checkbox works with. >> >> http://www.nabble.com/Design-questions%3A-Use-of-controllers-and-wicket-models-tf3373279.html#a9510784 >> >> i don't understand how the implentaion works. can you help me with >> understanding how that works please. >> >> -B >> >> >> >> Eelco Hillenius wrote: >> >>> Wicket models are a way to locate values. >>> >>> Let's take a look at wicket.examples.compref.CheckBoxPage. That page >>> has a nested static class called Input, with a property bool: >>> >>> private static class Input implements Serializable >>> { >>> public Boolean bool = Boolean.TRUE; >>> } >>> >>> Then, in CheckBoxPage's constructor we do (simplified): >>> >>> final Input input = new Input(); >>> setModel(new CompoundPropertyModel(input)); >>> Form form = new Form("form"); >>> form.add(new CheckBox("bool")); >>> >>> CompoundPropertyModel might be a bit distracting, so let's rewrite >>> this to use a normal model: >>> >>> final Input input = new Input(); >>> Form form = new Form("form"); >>> form.add(new CheckBox("bool", PropertyModel(input, "bool"))); >>> >>> another way to rewrite the model: >>> >>> form.add(new CheckBox("bool", new Model(input) >>> { >>> public Object getObject() >>> { >>> return ((Input)super.getObject()).bool; >>> } >>> >>> public void setObject(Object object) >>> { >>> ((Input)super.getObject()).bool = (Boolean)object; >>> } >>> })); >>> >>> and yet another to rewrite the model is: >>> >>> form.add(new CheckBox("bool", new IModel() >>> { >>> public Object getObject() >>> { >>> return input.bool; >>> } >>> >>> public void setObject(Object object) >>> { >>> input.bool = (Boolean)object; >>> } >>> >>> public void detach() >>> { >>> } >>> })); >>> >>> and *yet* another way is: >>> >>> form.add(new CheckBox("bool", new AbstractCheckBoxModel() >>> { >>> @Override >>> public boolean isSelected() >>> { >>> return input.bool; >>> } >>> >>> @Override >>> public void select() >>> { >>> input.bool = true; >>> } >>> >>> @Override >>> public void unselect() >>> { >>> input.bool = false; >>> } >>> })); >>> >>> If you compare these examples, the constant factor is that we're after >>> the bool property of the Input instance. It is important that you >>> understand that the typical thing for Wicket models to do is to pass >>> and get values from other objects, typically your domain objects or >>> 'form beans' (that's the name which other frameworks often use). Here, >>> the Input instance is that object, and any of the above combinations >>> just provides the facility for components to work on that object in a >>> generic fashion. >>> >>> So... the CheckBox component calls getObject on it's model to >>> determine whether it should render itself as checked or not. It calls >>> setObject on the model when it receives input. The typical case for >>> that is when it is part of a form. The form calls updateModel on all >>> nested components, and the components then call setObject with the >>> received (and converted) input. >>> >>> Now, to get back to your original question. We could rewrite the above >>> example to work on a list of checkboxes/ input objects like this: >>> >>> List<Input> inputs = new ArrayList<Input>(Arrays.asList(new Input[] { >>> new Input(), >>> new Input(), new Input() })); >>> ListView l = new ListView("list", inputs) >>> { >>> @Override >>> protected void populateItem(ListItem item) >>> { >>> // item.getModel().getObject() would give the Input >>> instance for >>> // this particular list element >>> item.add(new CheckBox("bool", new >>> PropertyModel(item.getModel(), >>> "bool"))); >>> } >>> }; >>> form.add(l); >>> System.err.println("selection for the second input: " + >>> inputs.get(1).bool); >>> >>> As you can see, the idea stays the same; in both cases we're after the >>> bool property of instances of Input. >>> >>> I'd say, let this sink in a bit, and try to play with this code >>> yourself, so that you understand better how it works. >>> >>> Hope this helps, >>> >>> Eelco >>> >>> On 3/27/07, GS-ikiini <[EMAIL PROTECTED]> wrote: >>> >>>> ok so i'm trying to implement my own model but i have little idea what >>>> i >>>> am >>>> suppose to be trying to do here. can someone please give a brief >>>> overview >>>> as >>>> to what the getObject, and setObject expects and does please. I am >>>> really >>>> lost and need some help with this. also how does the model intereact >>>> with >>>> the componenet..what do they tell each other.? >>>> >>>> -B >>>> >>>> >>>> >>>> igor.vaynberg wrote: >>>> >>>>> On 3/26/07, GS-ikiini <[EMAIL PROTECTED]> wrote: >>>>> >>>>>> its saying that you create a custom model that takes as an argument >>>>>> in >>>>>> the >>>>>> constructor the object/model that you want to tie to a check box. >>>>>> this >>>>>> model >>>>>> is used as the model that we pass to our check box component. the >>>>>> setObject >>>>>> method gets called at the push of the submit button and sets that >>>>>> object/model as part of the collection if it is selected. is this >>>>>> correct? >>>>>> >>>>> sounds about right. >>>>> >>>>> -igor >>>>> >>>>> >>>>> >>>>> -B >>>>> >>>>>> >>>>>> igor.vaynberg wrote: >>>>>> >>>>>>> if you dont grasp the concepts perhaps you should read the wiki page >>>>>>> >>>> on >>>> >>>>>>> models >>>>>>> >>>>>>> the concept is: >>>>>>> >>>>>>> since the checkbox works by setting/clearing a boolean the model >>>>>>> translates >>>>>>> a set boolean->insert into collection and clear boolean->remove from >>>>>>> collection. >>>>>>> >>>>>>> there is explanation there, try to read that too, not just look at >>>>>>> >>>> the >>>> >>>>>>> code. >>>>>>> >>>>>>> -igor >>>>>>> >>>>>>> >>>>>>> On 3/26/07, GS-ikiini <[EMAIL PROTECTED]> wrote: >>>>>>> >>>>>>>> I don't quite grasp the concepts used in that tread. from what i >>>>>>>> understand i >>>>>>>> should create a separate model that takes the model that has to get >>>>>>>> set(the >>>>>>>> model that is selected via checkbox) in the object i'm making, and >>>>>>>> >>>>>> places >>>>>> >>>>>>>> it >>>>>>>> in a collection if it is selected. Is this correct? >>>>>>>> >>>>>>>> -B >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> igor.vaynberg wrote: >>>>>>>> >>>>>>>>> please search mail archives before posting >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>> http://www.nabble.com/Design-questions%3A-Use-of-controllers-and-wicket-models-tf3373279.html#a9510784 >>>> >>>>>>>>> -igor >>>>>>>>> >>>>>>>>> >>>>>>>>> On 3/26/07, GS-ikiini <[EMAIL PROTECTED]> wrote: >>>>>>>>> >>>>>>>>>> Hey all, >>>>>>>>>> >>>>>>>>>> I have a list view that contains a list of objects. these >>>>>>>>>> >>>> objects >>>> >>>>>> are >>>>>> >>>>>>>>>> selectable via checkboxes. My problem is that i don't know how >>>>>>>>>> >>>> to >>>> >>>>>> know >>>>>> >>>>>>>> or >>>>>>>> >>>>>>>>>> tell my code what objects have been selected. here is what i >>>>>>>>>> >>>> want >>>> >>>>>> to >>>>>> >>>>>>>> do. >>>>>>>> >>>>>>>>>> i ahve a list of objects lets call them pens. So i have a list >>>>>>>>>> >>>> of 5 >>>> >>>>>>>>>> different types of pen objects. this object type is a property ( >>>>>>>>>> >>>> a >>>> >>>>>>>> list >>>>>>>> >>>>>>>>>> of >>>>>>>>>> this object to be specific) in another object say a pencilCase. >>>>>>>>>> >>>> i >>>> >>>>>>>> want >>>>>>>> a >>>>>>>> >>>>>>>>>> user to select 0-many different pens which will then be placed >>>>>>>>>> >>>> in >>>> >>>>>> the >>>>>> >>>>>>>>>> pencil >>>>>>>>>> case by the applicaition. what i am not sure how to do is >>>>>>>>>> >>>> associate >>>> >>>>>>>> each >>>>>>>> >>>>>>>>>> pen >>>>>>>>>> in the list with what is selected. I seen on the wiki that i can >>>>>>>>>> >>>>>> add >>>>>> a >>>>>> >>>>>>>>>> boolean property to the pens called selected. and make that what >>>>>>>>>> >>>>>> the >>>>>> >>>>>>>>>> checkbox renders on. but i don't have access to the pens to do >>>>>>>>>> >>>>>> that. >>>>>> >>>>>>>> is >>>>>>>> >>>>>>>>>> another some way i can do an association externally? I thought >>>>>>>>>> >>>> of >>>> >>>>>>>>>> creating >>>>>>>>>> a >>>>>>>>>> separate list of booleans variables that i can compare side by >>>>>>>>>> >>>> side >>>> >>>>>>>> with >>>>>>>> >>>>>>>>>> the >>>>>>>>>> list of pens. selection of check boxes will set the booleans in >>>>>>>>>> >>>>>> that >>>>>> >>>>>>>>>> list. >>>>>>>>>> then look at what is true and go get the pen in the pens list at >>>>>>>>>> >>>>>> that >>>>>> >>>>>>>>>> position and do what i got to do with it. however I think this >>>>>>>>>> >>>>>> method >>>>>> >>>>>>>> 1- >>>>>>>> >>>>>>>>>> may >>>>>>>>>> not work and 2 - is to elementary and not very professional. I >>>>>>>>>> >>>> am >>>> >>>>>> sure >>>>>> >>>>>>>>>> there >>>>>>>>>> is another way to do this. Please advise. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -B >>>>>>>>>> -- >>>>>>>>>> View this message in context: >>>>>>>>>> >>>>>>>>>> >>>> http://www.nabble.com/check-box-questions-how-to-I-associate-an-object-with-a-boolean-seletion-from-a-checkbox-component-tf3469311.html#a9680769 >>>> >>>>>>>>>> Sent from the Wicket - User mailing list archive at Nabble.com. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>> ------------------------------------------------------------------------- >>>> >>>>>>>>>> Take Surveys. Earn Cash. 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