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In my code as follows,
I am confused when I can get page reference from desktop in onCreate() event of one of my included pages.
Why Page sourcePage = Executions.getCurrent().getDesktop().getPage("SchoAppForm"); and sourcePage is NULL?
I thought ALL components including pages have been created completely before calling onCreate() event.
Even if I try to use Defer mode: <include src="/share/SearchScholarship.zul" mode="defer" />, that page is still NULL.
I thought this zul page will be created as late as Rendering Phase and the other zul page can be created earlier that it....so should be working?
Please help me out.... I am stuck now.
Thank you very much!
Main Page:
<?page title="Create your application" contentType="text/html;charset=UTF-8"?> <?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit"?> <box id="appBox" apply="sas.application.CreateAppComposer"> <vbox sclass="myInnerVBox" height="100%"> <include src="/share/SearchScholarship.zul"/> <separator spacing="25px" bar="true" /> <window title="Application" border="normal" width="100%" height="auto" contentStyle="overflow:auto"> <include src="/share/form_ScholarshipApp.zul" /> </window> </vbox> </box> </zk>
<?page title="SearchScholarship" contentType="text/html;charset=UTF-8"?>
<window id="mainZK" apply="sas.scholarship.SearchSchoComposer">
<!--do something here-->
<listbox id="schoList" model="@{mainZK$composer.Scholarships}"
width=" 945 px " rows="5" sizedByContent="false">
<listhead>
<listheader image="/images/ListBox-icon.png"
label="Freshmen only scholarships" sort="auto" />
</listhead>
<listitem self="@{each='scho'}" value="@{scho}" height="25px">
<listcell label="@{scho.Scho_Name}" />
</listitem>
<listfoot>
<listfooter id="listFooter" />
</listfoot>
</listbox>
</window><?page id="SchoAppForm" title="form_ScholarshipApp" contentType="text/html;charset=UTF-8"?> <window id="mainWin" apply="sas.application.SchoAppFormComposer"> <!--do something here--> </window>
public class SearchSchoComposer extends GenericForwardComposer {
Listbox schoList;
public void doAfterCompose(Component win) throws Exception {
super.doAfterCompose(win);
}
public void onCreate() {
schoList.setSelectedIndex(0);
Events.postEvent(new SelectEvent(Events.ON_SELECT, schoList, schoList
.getSelectedItems()));
}
public void onSelect$schoList(SelectEvent eve) {
Set<Listitem> items = eve.getSelectedItems();
Listitem selectedItem = null;
// this is single selection
Iterator<Listitem> iterator = items.iterator();
while (iterator.hasNext()) {
selectedItem = iterator.next();
}
// get all text criteria of this selected scholarship(retrieve from DB
// every time when selecting one scholarship)
Scholarship selectedScho = (Scholarship) selectedItem.getValue();
selectedScho.setTextCriteria(SchoTextCriteriaDB.Search(selectedScho));
// post an event on another page to display this scholarship
Page sourcePage = Executions.getCurrent().getDesktop().getPage("SchoAppForm"); ---> sourcePage is NULL !!
Window win = (Window) sourcePage.getFellow("mainWin");
Events.postEvent(new Event("onDisplay", win, selectedScho));
}
}you can take a look these code :)
index.zul
<?page id="index_page" title="Create your application" contentType="text/html;charset=UTF-8"?> <zk> <include src="SearchScholarship.zul" /> <window id="wins" border="normal" width="100%" height="auto" contentStyle="overflow:auto"> <include id="inc" src="form_ScholarshipApp.zul" /> </window> </zk>
SearchScholarship.zul
<?page title="SearchScholarship" contentType="text/html;charset=UTF-8"?> <window id="mainZK" apply="org.zkoss.test.SearchSchoComposer"> <button id="mybtn" label="getPage" /> </window>
form_ScholarshipApp.zul
<?page id="SchoAppForm" title="form_ScholarshipApp" contentType="text/html;charset=UTF-8"?>
<window id="mainWin">
<button id="submit" label="submit" />
<zscript><![CDATA[
System.out.println("form : " + page.getId());
]]></zscript>
</window>SearchSchoComposer.java
package org.zkoss.test;
import java.util.Collection;
import java.util.Iterator;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.Path;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Button;
public class SearchSchoComposer extends GenericForwardComposer {
Button mybtn;
public void doAfterCompose(Component win) throws Exception {
super.doAfterCompose(win);
}
public void onCreate() {
System.out.println("onCreate : " + page.getId());
// System.out.println(page.getFellow("mainWin"));
}
public void onClick$mybtn() {
Collection c = Executions.getCurrent().getDesktop().getPages();
System.out.println("--ALL YOUR PAGE--");
for (Iterator iterator = c.iterator(); iterator.hasNext();) {
Page page = (Page) iterator.next();
System.out.println(page.getId());
// your <? page xxxx ?> in include file will be ignore, coz ZK page
// is just like your "PAGE" only seen ONE !!
}
System.out.println("--END--");//Following code shows how to get the window "mainWin" in form zul
System.out.println(page.getFellow("wins").getFellow("inc").getFellow("mainWin"));
System.out.println(Path.getComponent("/wins/inc/mainWin"));
}
}Hi RyanWu, thank you for your help and clarification. Now, I understand better :-)
However, in which situations we can get more than one page by using Executions.getCurrent().getDesktop().getPages();
After reading ZK5.0.3 API doc, when a include is Defer mode, is that will be one of the situations?
How about inline Macro? because I just relize a Instant Include works alike to regular Macro....
Hi enix
You can refer to Inline Macros
It will not create a page
thank you Jimmy :)
I was thinking about using Macros instead <include>, and now still curious about which situations we can get more than one page by using Executions.getCurrent().getDesktop().getPages();
if all possible usages will turn out only one page.
@enix0907
here i comes again !!
my index.zul
<?page id="index_page" title="Create your application" contentType="text/html;charset=UTF-8"?> <zk> <include src="SearchScholarship.zul" mode="auto"/> <!-- This will create a page !! --> <include src="SearchScholarship2.zul" mode="defer"/> <window id="wins" border="normal" width="100%" height="auto" contentStyle="overflow:auto"> <include id="inc" src="form_ScholarshipApp.zul" /> </window> </zk>
SearchScholarship2.zul is a copy version of SearchScholarship.zul , i only changed the composer apply="org.zkoss.test.SearchSchoComposer2"
SearchSchoComposer2.java
package org.zkoss.test;
import java.util.Collection;
import java.util.Iterator;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.Path;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Button;
import org.zkoss.zul.Window;
public class SearchSchoComposer2 extends GenericForwardComposer {
Button mybtn;
public void doAfterCompose(Component win) throws Exception {
super.doAfterCompose(win);
}
public void onCreate() {
System.out.println("onCreate2 : " + page.getId());
}
public void onClick$mybtn() {
Collection c = Executions.getCurrent().getDesktop().getPages();
System.out.println("--ALL YOUR PAGE--");
for (Iterator iterator = c.iterator(); iterator.hasNext();) {
Page page = (Page) iterator.next();
System.out.println(page.getId());
// your <? page xxxx ?> in include file will be ignore, coz ZK page
// is just like your "PAGE" only seen ONE !!
Window w = new Window();
w.getPreviousSibling();
}
System.out.println("--END--");//Following code shows how to get the window "mainWin" in form zul
//System.out.println(page.getFellow("wins").getFellow("inc").getFellow("mainWin")); (you can't get by page because you have your own
System.out.println(Path.getComponent("//index_page/wins/inc/mainWin")); // Sure you can get other page's component
}
}
now, you can have two pages using defer mode
let me talk about the macro component,
the inline macro -> you can image it is a include (auto)
the default macro ->you can image it is a include (defer) , but it does NOT create a Page.
It has it's own IdSpace, that means you can create a composer in a macro and get data from same ID component (COOL!)
in the document : ZK Basic conceptss
More generally, any component could form an ID space as long as it implements the org.zkoss.zk.ui.IdSpace interface. Page also implements the IdSpace interface, so it is also a space owner. Besides window and page, regular macro is another built-in space owner.
index2.zul
<?component name="test" inline="true" macroURI="/test/Inter_Page/macro.zul"?> <?component name="test2" macroURI="/test/Inter_Page/macro.zul"?> <zk> <test macroURI="/test/Inter_Page/macro.zul" title="testTitle" /> <!-- <test macroURI="/test/Inter_Page/macro.zul" title="testTitle" /> error --> <test2 macroURI="/test/Inter_Page/macro.zul" title="testTitle" /> <test2 macroURI="/test/Inter_Page/macro.zul" title="testTitle" /> </zk>
macro.zul (why error with inline ? coz window have id="test" !!
<window id="test" border="normal" title="${arg.title}" width="200px">
<label value="${empty arg.desc ? 'wow': arg.desc}" />
</window>
now you can choose one from include/ Macro / Executions.getCurrent().createComponents to satisfied your project spec :)
I appreciate your well-defined examples to make me understand more about their differences and features. :=)
Thank you all again for helping me out!!!!!
Asked: 2010-08-20 02:15:14 +0800
Seen: 942 times
Last updated: Aug 28 '10