Multiple selection in listbox with databinding

asked 2012-01-05 09:00:26 +0800

Neus gravatar image Neus
1415 14

I have a listbox with attributes multiple="true" and checkmark="true".
When the listbox is created (with no items because items only appears when a button is clicked) the checkmark to select multiple items is displayed in the listheader.
But when I fill the listbox with data (binder.loadComponent(LBFicheros)) the checkbox disappears and a radiobutton is displayed in each row. I checked if the listbox for some reason changes to multiple="false" but is not so, listbox is still multiple.

Any idea why is this happening?

My listbox:

<listbox  id="LBFicheros" multiple="true" checkmark="true" width="100%" vflex="1" mold="paging" autopaging="true"  model="@{VentanaFicheros$composer.listaBeans}">
          <listhead sizable="true">
          <listitem id="fila" self="@{each=ServidorBean}" value="@{ServidorBean}">
                    <listcell label="@{ServidorBean.Tabla}" tooltiptext="@{ServidorBean.Tabla}" style="text-align:left;white-space:nowrap"/>

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answered 2012-01-05 09:50:45 +0800

Matze2 gravatar image Matze2
773 7

Which ZK version?

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answered 2012-01-05 11:42:24 +0800

Neus gravatar image Neus
1415 14

I just found the solution.
It was my fault.


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answered 2012-01-05 12:34:34 +0800

Steva77 gravatar image Steva77 flag of Italy
1014 3

Neus, please could you post the solution to the problem, or a description of your error, for future readers?

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answered 2012-01-27 09:58:10 +0800

Neus gravatar image Neus
1415 14

I was doing something wrong..I don't think that naybody will do that too :P (in some part of my application I was setting multiple to false)

But...now I update to ZK 6 and it is happening again!And it seems that this time is not my fault!

Don't know why is this happening...But setting listbox multiple="true" and checkmrk ="true" doesn't work. It shows a radiobutton and no multiple selection is available.

I found and example in ZK Fiddle in which is happening the same...


<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit" ?>
class customListbox extends org.zkoss.zul.Listbox {
public Listitem getSelectedItem() {
Listitem li = super.getSelectedItem();
if (li == null) {
// get first item if no one is selected
li = getItemAtIndex(0);
if (li == null) {
// create an invalid item if no item in listbox
li = new Listitem();
People p = new People();
p.setName("Invalid Name");
return li;
page.getComponentDefinition("listbox", true).setImplementationClass(customListbox.class);

// the class of people
class People {
String name;
int age;

public void setName(String name) {
this.name = name;
public void setAge(int age) {
this.age = age;
public String getName() {
return name;
public int getAge() {
return age;

// create data list
List lpeoples = new ArrayList();
List lpeoplesEmpty = new ArrayList();
for (int i = 15;i != 20;i ++) {
People p = new People();
p.setName("Name "+i);
<li> check / uncheck the "clear data" checkbox to clear / restore the data</li>
<li> the value will show in textbox when header double_clicked</li>
<li> if an item selected, selected item is that one</li>
<li> if no item selected, selected item is the first item</li>
<li> if no item in listbox, will create an invalid one</li>
<checkbox label="clear data">
<attribute name="onCheck">
if (self.checked)
listOfPeople.setModel(new BindingListModelList(lpeoplesEmpty, true));
listOfPeople.setModel(new BindingListModelList(lpeoples, true));
name: <textbox id="sName" />
age: <textbox id="sAge" />
<listbox id="listOfPeople" checkmark="true" multiple="true" model="@{lpeoples}"
value="@{peopleData}" selectedItem="@{selectedPeople}">
<listhead sizable="true">
<attribute name="onDoubleClick">
People p = (People)listOfPeople.getSelectedItem().getValue();
<listheader label="Name"/>
<listheader label="Age"/>
<listitem self="@{each=people}" value="@{people}">
<listcell label="@{people.name}"/>
<listcell label="@{people.age}"/>

In this example checkmark and multiple are setted to true but if you run it using Zk 6.0 only radiobutton appears and you can't select more than one item!

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answered 2012-01-27 10:28:49 +0800

Matze2 gravatar image Matze2
773 7

updated 2012-01-27 10:30:15 +0800

In ZK6, the multiple flag of the llistbox may get overwritten by the multiple flag of the listmodel. These are the possibilities to circumvent it:
- provide a "real" ListModel as model and set multiple=true there
- with ZK6 binding you can bind selectedItems instead of selectedItem, then multiple=true is set automatically
- use a converter like that on the model to fix that behavior:

 * Fix multiple selection state.
 * @author matze
public class MultiSelectionConverter extends ListModelConverter {
	private static final long serialVersionUID = 1L;

	public Object coerceToUi(Object val, Component comp) {
		Object bean = super.coerceToUi(val, comp);
		AbstractListModel<?> model = (AbstractListModel<?>) bean;
		Listbox listbox = (Listbox) comp;
		if (listbox.isMultiple() && !model.isMultiple()) {
		return bean;

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answered 2012-01-30 08:58:57 +0800

Neus gravatar image Neus
1415 14

Thank you! I fixed it using the converter!

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answered 2012-02-17 11:18:25 +0800

Neus gravatar image Neus
1415 14

updated 2012-02-17 11:22:26 +0800

I'm changing to ZK6 binding.
Matze2 said that with ZK6 Bind if selectedItems are bind multiple="true" is set automatically.
I tried it and multiple="true"wasn't set.
So I hope some of you can help me finding what I'm not doing well:
This is my listbox:

<listbox nonselectableTags="*" id="LBFicheros" multiple="true" checkmark="true" mold="paging" autopaging="true" model="@load(vm.items)" selectedItems="@bind(vm.selected)">

As you can see I'm binding selectedItems
Then, this is my java code
private Set <ServidorBean> selected;
public Set<ServidorBean> getSelected() {
       System.out.println("Entra en getSelected");
	return selected;
public void setSelected(Set<ServidorBean> selected){
	System.out.println("Entra en setSelected");
	this.selected = selected;

With this code multiple selection is not enabled and radiobuttons are shown instead of checkboxes.

If I set multiple="true" in the ListModelList it works OK but I understood (maybe I'm wrong) that it is not necessary if selectedItems are binded.

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answered 2012-02-17 12:06:32 +0800

Matze2 gravatar image Matze2
773 7

updated 2012-02-17 12:07:49 +0800

Things changed during the ZK6 development. Currently my multi-selection listboxes look like the following:

<listbox multiple="true"

This works with ZK6 release, as far as I remember (cannot check that currently).
As mentioned in another post today, I cannot help with "checkmark" feature.

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answered 2012-02-17 12:29:27 +0800

Neus gravatar image Neus
1415 14

Ok, I reproduce your listbox:

<listbox id="LBFicheros" multiple="true" model="@load(vm.items)" selectedItems="@bind(vm.selected)">

I remove the paging and the checkmark="true".
And I can't even select multiple items. I press CTRL key and click various items but selection change instead of select all items.
So, my question is...If it works for you..Maybe there's something wrong (that I can't see) with my getter, setter and the instance of selected? Could anyone confirm me that they are ok??

I repeat that setting multiple to listmodellist works.

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answered 2012-02-17 13:43:22 +0800

Matze2 gravatar image Matze2
773 7

updated 2012-02-17 13:46:04 +0800

Yes, this looks ok. Do you use ZK6 release?
And how does your getItems() looks like?

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Asked: 2012-01-05 09:00:26 +0800

Seen: 1,394 times

Last updated: Feb 21 '12

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