I created a HashMapChoiceRenderer which extends ChoiceRenderer. I'm not sure if
this is the best way to go about it, but it worked for me to specifically set
the value with a set of checkboxes.
disclaimer : hotmail munches code, so you will want to throw this code into an
ide and format it.
Here is how I add my new component:
###########################
DropDownChoice groupSelect = new DropDownChoice("selectGroup", new
PropertyModel(this, "selectGroup"), userGroups, new HashMapChoiceRenderer())
{ /** * Every object will be a HashMap that has just one item. So, it * is
safe to grab the first item from the keySet iterator and * test with the
value persisted. * * @see
org.apache.wicket.markup.html.form.AbstractSingleSelectChoice#isSelected(java.lang.Object,
* int, java.lang.String) */�...@override protected boolean
isSelected(Object object, int index, String selected) { HashMap<String,
String> testee = (HashMap<String, String>) object; String id =
testee.keySet().iterator().next(); return
(id.equals(getSelectGroup())); }};
###########################
When Wicket calls your setter, it gives you a string that has both the id and
the value - a serialized view of the hashmap, so I did this with the setter
###########################/** * Added logic to look for the occurance of {
since the dropdown list * will usually supply {id=value} as a string. * *
@param sortListBy * the sortListBy to set */public void
setSortListBy(String sortListBy) { if (sortListBy != null &&
sortListBy.contains("{")) this.sortListBy =
HashMapChoiceRenderer.getListSelectionValue(sortListBy); else
this.sortListBy = sortListBy;}
Here is the component
###########################
import java.util.HashMap;
import org.apache.commons.logging.Log;import
org.apache.commons.logging.LogFactory;import
org.apache.wicket.markup.html.form.ChoiceRenderer;
/** * This class will let you use a HashMap<String,String> as an IModel for
your * DropDownChoice. * * @author <a
href="mailto:russellsimpk...@hotmail.com";>Russell Simpkins</a> */public class
HashMapChoiceRenderer<T> extends ChoiceRenderer<T> {
private static final long serialVersionUID = 1904209513899620301L;
public static final Log log = LogFactory.getLog(HashMapChoiceRenderer.class);
/** * A utility method for getting back the value of a list selection
value * where the input is a String wiht a format of {id=value} where we
want the * "id" part * * @param selection * @return String the
"value=" part of an HTML select field */ public static final String
getListSelectionValue(String selection) { String[] parts = ((String)
selection).replaceAll("([{]|[}])", "").split("[=]"); return parts[0];
}
/** * A utility method for getting back the value of a list selection
value * where the input is a String wiht a format of {id=value} where we
want the * "value" part * * @param selection * @return String
- the display value a user would have seen */ public static final String
getListSelectionDisplay(String selection) { String[] parts = ((String)
selection).replaceAll("([{]|[}])", "").split("[=]"); return parts[1];
}
/* * (non-Javadoc) * * @see *
org.apache.wicket.markup.html.form.ChoiceRenderer#getDisplayValue(java *
.lang.Object) */ �...@suppresswarnings("unchecked") �...@override
public Object getDisplayValue(T object) { try {
HashMap<String, String> item = (HashMap<String, String>) object;
return item.values().iterator().next(); } catch (ClassCastException cce)
{ log.debug("getDisplayValue was passed something other than a
HashMap", cce); } catch (Exception e) { log.error("There was
an unforseen error. ", e); } return
super.getDisplayValue(object); }
/* * (non-Javadoc) * * @see *
org.apache.wicket.markup.html.form.ChoiceRenderer#getIdValue(java.lang *
.Object, int) */ �...@suppresswarnings("unchecked") �...@override
public String getIdValue(T object, int index) { try { if
(object instanceof String) { return
HashMapChoiceRenderer.getListSelectionValue((String) object); } else
{ HashMap<String, String> item = (HashMap<String, String>)
object; return item.keySet().iterator().next(); }
} catch (ClassCastException cce) { log.debug("getIdValue was
passed something other than a HashMap: " + object + " index: " + index, cce);
} catch (Exception e) { log.error("There was an unforseen
error. ", e); } return super.getIdValue(object, index); }
}
###########################
Russ
> I have a bean with enum field.
> When I implements radiochoice model by this enum field in html radiochoise
> code i see:
>
>
> type="radio">YES
>
> type="radio">NO
>
>
> Labels contents enum values. But input values contents order element index
> and this is no good!
> How implements radiochoise so value of input contents enum value? (no index
> element!)
>
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