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hi,
i have one Combobox,
when the Combobox value is changed, i want change the listheader too,
i have made this
public void loadListIncident() {
listIncident.getItems().clear();
listIncident.getHeads().clear();
listIncident.getChildren().clear();
Listhead lhd = new Listhead();
if (cbTemplate.getValue().equalsIgnoreCase("default")){
Listheader lh = new Listheader();
lh.setLabel("ID");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("DESCRIPTION");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("OWNER");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("STATUS");
lh.setParent(lhd);
}else if (!cbTemplate.getValue().equalsIgnoreCase("default")){
Listheader lh = new Listheader();
lh.setLabel("ID");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("NAME");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("DESCRIPTION");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("DEPARTMENT");
lh.setParent(lhd);
}
lhd.setParent(listIncident);
}
invoked by this
public void onChange$cbTemplate(Event event){
loadListIncident();
}
but i've got an error when i change the combobox value
Jul 11, 2011 4:05:17 PM org.zkoss.zk.ui.impl.UiEngineImpl handleError:1131 SEVERE: >>java.lang.UnsupportedOperationException >> at org.zkoss.zul.Listbox$Iter.remove(Listbox.java:2783) >> at java.util.AbstractCollection.clear(Unknown Source) >> at com.telkomsel.composer.reports.DynamicReportComposer.loadListIncident(DynamicReportComposer.java:311) >> at com.telkomsel.composer.reports.DynamicReportComposer.onChange$cbTemplate(DynamicReportComposer.java:124) >> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) >> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) >> at java.lang.reflect.Method.invoke(Unknown Source) >> at org.zkoss.zk.ui.event.GenericEventListener.onEvent(GenericEventListener.java:89) >> at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:197) >> at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:141) >>...
can someone help me?
i really don't where's the bug..
thanks for all of your kindly replies..
Hi Gellaps,
you do not need to create new header objects,
just change the label of origional headers.
a simple sample below, consists of 2 files,
test.zul and TestComposer.java,
the headers of the list will change while button clicked
WebContent / test.zul
<?script src="/js/someFoo.js" ?>
<zk>
<window id="win" apply="test.TestComposer">
<listbox id="testList">
<listhead sizable="true">
<listheader label="old label 1" sort="auto"/>
<listheader label="old label 2" sort="auto"/>
<listheader label="old label 3" sort="auto"/>
<listheader label="old label 4" sort="auto"/>
<listheader label="old label 5" sort="auto"/>
</listhead>
<listitem>
<listcell label="data 1"/>
<listcell label="data 2"/>
<listcell label="data 3"/>
<listcell label="data 4"/>
<listcell label="data 5"/>
</listitem>
</listbox>
<button id="testButton" label="test">
</button>
</window>
</zk>
src / test / TestComposer.java
package test;
import java.sql.Timestamp;
import java.util.Iterator;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Button;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listhead;
import org.zkoss.zul.Listheader;
public class TestComposer extends GenericForwardComposer {
// newButton, variable name should equal to the id of the button in zul
Button testButton;
Listbox testList;
// pattern: event + $ + variable name
// onClick + $ + newButton here
public void onClick$testButton() {
Listhead lh = testList.getListhead();
Listheader lhr = (Listheader)lh.getFirstChild();
int i = 1;
while(lhr != null) {
lhr.setLabel(" new Label " + i++);
lhr = (Listheader)lhr.getNextSibling();
}
}
}
thank you benbai :)
but it didn't solve my problem yet, since i want to create a dynamic listbox,
and it means that the number of listhead will always change depending on demand..
moreover, i have solve my problem :)
this is they should be
public void loadListIncident() {
/*just remove this
listIncident.getItems().clear();
listIncident.getHeads().clear();
*/
listIncident.getChildren().clear();
Listhead lhd = new Listhead();
if (cbTemplate.getValue().equalsIgnoreCase("default")){
Listheader lh = new Listheader();
lh.setLabel("ID");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("DESCRIPTION");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("OWNER");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("STATUS");
lh.setParent(lhd);
}else if (!cbTemplate.getValue().equalsIgnoreCase("default")){
Listheader lh = new Listheader();
lh.setLabel("ID");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("NAME");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("DESCRIPTION");
lh.setParent(lhd);
lh = new Listheader();
lh.setLabel("DEPARTMENT");
lh.setParent(lhd);
}
lhd.setParent(listIncident);
}
thank you :)
gellaps, thanks for your post, it helped me solve the same issue. I've taken your approach a step further:
If you pass a regular string with say, commas, as the list header delimiters, you can also do this:
void changeListHeader (String headings)
{
String[] hds = headings.split(",") ; // Change this to whatever suits you, e.g. |
listIncident.getChildren().clear() ;
Listhead lhd = new Listhead() ;
for (String label : hds)
{
Listheader lh = new Listheader () ;
lh.setLabel(label.trim()) ;
lh.setParent(lhd) ;
}
lhd.setParent(listIncident) ;
}
To call this, you simply need to have wherever you want the list change to be triggered from, do this:
changeListHeader ("First Heading, Second Heading, Some other Heading") ;
Hope that helps.
Asked: 2011-07-11 04:10:47 +0800
Seen: 352 times
Last updated: Jul 19 '11