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Hi All,
I am a newbie with ZK. I upgraded an already existing application from ZK-3.6.x to ZK-5.0.8 recently and I have run into an issue with listbox taking lot of time to load data. Any pointers on how to fasten this listbox loading. With zk 3.x it was pretty fast but with zk-5.0.8 its dead slow.
-wangditashi
Hi,
I also got a severe performance problem when upgrading to ZK 5.0.8.
Found out that the performance problem was on using the hlayout component inside a listcell. Switchint to hbox solved for me.
Thanks for the help. But we are not using any hlayout component in our application as it was introduced in versions later than 3.x.
Here is the code snippet that we are using to load the listbox with the data ---
<listbox id="listboxAlerts" fixedLayout="true" rows="4">
<listhead>
<listheader id="listheaderAlertCode" label="Alert Code" sort="auto" style="width:12%;"/>
<listheader id="listheaderDescription" sort="auto" style="width:58%;"/>
<listheader id="listheaderValidate" sort="auto" style="width:10%;"/>
<listheader id="listheaderNotifyService" sort="auto" style="width:10%;"/>
<listheader id="listheaderNotifyCustomer" sort="auto" style="width:10%;"/>
</listhead>
</listbox>
and the java code to add listitems and listcells on the runtime...
Listbox listboxModels = getListbox("listboxModels");
Listitem listitem = new Listitem();
listitem.setValue(model);
createListCell(model.getName(), listitem);
listitem.setParent(listboxModels);
public Listcell createListCell(String label, Listitem parent) {
Listcell listcell = new Listcell();
listcell.setLabel(label);
listcell.setParent(parent);
return listcell;
}
I also got a similar Issue.
I wanted to migrate an existing ZK Application to ZK5 (from 3.5.2).
With 3.5 the listbox reloading was instant. With ZK5 (all versions up to 5.0.8 tested), already with about 200 items in 2 listboxes, the rendering takes up to 10 seconds. Tested with IE, Firefox and Chrome. All very slow.
Initial Page-Loading is okay though. Only the reloading after changing takes ages.
Here is a small dummy Application showing the problem.
INDEX.ZUL
<?page title="Auto Generated index.zul"?> <window border="normal" use="test.TestWindow" apply="test.TestComposer" width="100%" contentStyle="overflow:auto;position:relative" height="698px" id="win" forward="onCreate=onPageCreate"> <tabbox id="tabBox"> <tabs> <tab label="label.selection" closable="false" /> </tabs> <tabpanels> <tabpanel> <groupbox mold="3d" id="input"> </groupbox> </tabpanel> </tabpanels> </tabbox> </window>
test.TestWindow.java
package test;
import org.zkoss.zk.ui.Components;
import org.zkoss.zk.ui.ext.AfterCompose;
import org.zkoss.zul.Groupbox;
import org.zkoss.zul.Window;
public class TestWindow extends Window implements AfterCompose {
private static final long serialVersionUID = 8958160798085756425L;
private Groupbox input;
public void setInput(Groupbox input) {
this.input = input;
}
public Groupbox getInput() {
return input;
}
public void afterCompose() {
Components.wireVariables(this, this);
}
}
test.TestComposer.java
package test;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.ForwardEvent;
import org.zkoss.zk.ui.util.GenericAutowireComposer;
import org.zkoss.zul.Caption;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Separator;
public class TestComposer extends GenericAutowireComposer {
private static final long serialVersionUID = -5425478484825293469L;
private TestWindow win;
public void onCreate(Event event) {
win = (TestWindow) self;
win.getInput().appendChild(new Caption("Test"));
Listbox l1 = createListboxControl();
l1.setId("my_listbox_1");
win.getInput().appendChild(l1);
win.getInput().appendChild(new Separator());
Listbox l2 = createListboxControl();
l2.setId("my_listbox_2");
win.getInput().appendChild(l2);
}
public void onParameterChanged(Event event) {
if (!(event instanceof ForwardEvent)) {
return;
}
final Event origin = ((ForwardEvent) event).getOrigin();
final String compId = origin.getTarget().getId();
if (origin.getTarget() instanceof Listbox) {
listboxChanged(origin);
}
}
private void listboxChanged(Event origin) {
final Listbox listbox = (Listbox) origin.getTarget();
addListboxItems(listbox);
}
private Listbox createListboxControl() {
final Listbox listbox = new Listbox();
listbox.setRows(1);
listbox.setMold("select");
listbox.addForward("onSelect", self, "onParameterChanged");
addListboxItems(listbox);
return listbox;
}
private void addListboxItems(final Listbox listbox) {
listbox.getChildren().clear();
for (int i = 0; i < 200; i++) {
listbox.appendItem(Math.random() + "", Math.random() + "");
}
}
}
I downloaded 5.0.9 build but the performance issue still persists. The same code used to instantly load data in the listbox with zk 3.6 build but the same throws script errors on 5.0.8/9 build. I made some minor changes to do away with the script errors but the performance is still very bad.
The new build 5.0.9 didn't help much in this case.
Asked: 2011-09-12 04:52:51 +0800
Seen: 357 times
Last updated: Sep 25 '11
