combobox options

[anna popova]

how can i put my categories values into drop down list ?

 
public class myBean{

private ArrayList<String> categories;

} 

[Tim Holloway]

You have to add a property to your backing bean that can read (get) a SelectItem collection (List or array).

There are 2 parts to HTML <OPTION> elements - the value and the label. So it requires a special object to supply both items, even in cases where the label and value are the same. The JSF SelectItem serves that function.

Basically, just iterate your String array and create a SelectItem for each string (there's a single-element constructor that can be used when the label and value are the same string).

For best results, create the SelectItem list when you first need it and cache it in a member variable in the backing bean. That saves overhead.

[anna popova]

thanks for reply.
this is the part of my code

<h:selectOneMenu value="#{myBean.selected">  
 <ui:repeat value="#{myBean.categories}" var="itm">  
   
 <f:selectItem itemValue="#{itm}" itemLabel="#{itm}"/>   
  
 </ui:repeat>  
</h:selectOneMenu>

what's wrong?

[Guy deLyonesse]

anna popova wrote:thanks for reply.
this is the part of my code

<h:selectOneMenu value="#{myBean.selected">  
 <ui:repeat value="#{myBean.categories}" var="itm">  
   
 <f:selectItem itemValue="#{itm}" itemLabel="#{itm}"/>   
  
 </ui:repeat>  
</h:selectOneMenu>

what's wrong?

You need to specify the member within the "itm" objects.

Your code should look something like this:

<h:selectOneMenu value="#{myBean.selected">  
 <ui:repeat value="#{myBean.categories}" var="itm">  
   
 <f:selectItem itemValue="#{itm.value}" itemLabel="#{itm.label}"/>   
  
 </ui:repeat>  
</h:selectOneMenu>

[anna popova]

even if the type of "itm" is String?

public class myBean{  
  
private ArrayList<String> categories;  
  
} 

[Guy deLyonesse]

The ArrayList should contain SelectItem objects, not Strings.

ArrayList items = new ArrayList();

String value = "1";
String label = "This is a list item."

SelectItem item = new SelectItem(value, label);
items.add(item);

Then the code in your view would be something like this:

				
<h:selectOneMenu 	id="type" value="#{backingBean.selectedItem}">
     <f:selectItems value="#{backingBean.items}" />
</h:selectOneMenu>

(I know that's different from what I said earlier... please disregard. I was thinking of a different control.)

The value of the SelectOneMenu is a String, which is the currently selected list item value. The items themselves are passed as an ArrayList of SelectItems.

(This is done in JSF 1.2)