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As a real-life example, I have a window with 2 listboxes:
- a Users listbox (model="@{userModel.users}", selectedItem="@{userModel.selectedItem}" to list all users (columns: full name, department)
- and a Departments listbox (mold="select", model="@{departmentModel}, selectedItem="@{userModel.selectedItem.department}) to set the selected user's department.
So far no problems.
Now, I would like to add a filter to the window in order to filter the Users list by Department. So I add another listbox (mold="select", model="@{departmentModel}, selectedItem="@{departmentModel.selectedItemAsFilter}, OnClick="filterUsers()").
When I run my application and select a user from the Users list I receive a "Cannot find associated CollectionItem..." error.
To demonstrate the problem I added a listbox to the Data binding example of ZK Explorer:
<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit" arg0="./mywin"?>
<window id="mywin" border="none">
ZK name check list :
<zscript>
//init example data beans
import org.zkoss.zkdemo.userguide.Person;
List persons = new ArrayList();
persons.add(new Person("Balu", "Haben"));
persons.add(new Person("Sadira", "Jobs"));
persons.add(new Person("Dacey", "Obert"));
persons.add(new Person("Gabby", "Taffy"));
Person selected = persons.get(0);
</zscript>
<!-- -->
<!-- Additional listbox to demonstrate the databinding problem -->
<!-- -->
<listbox id="filter" mold="select" model="@{persons}" >
<listitem self="@{each=person}" label="@{person.lastName}" />
</listbox>
<listbox model="@{persons}" selectedItem="@{selected}" rows="5">
<listhead >
<listheader label="Name"/>
</listhead>
<listitem self="@{each=person}" label="@{person.fullName}" />
</listbox>
<grid>
<columns>
<column label="First Name" />
<column label="Last Name" />
<column label="Full Name" />
</columns>
<rows>
<row>
<textbox id="firstName" value="@{selected.firstName}" />
<textbox value="@{selected.lastName}" />
<label value="@{selected.fullName}" />
</row>
</rows>
</grid>
</window>
The above code has no practical value at all but you can simply copy-paste it to ZK Explorer to see the problem described. Select a person from the main list to see the error message.
Is this a limitation of databinding or I just need to do something in a different way?
I see that creating a separate DepartmentFilter class then binding it to the departmentFilter listbox solves the problem, but I would like to avoid generating redundant filter classes.
Regards:
Tom
This problem has been discussed here:
http://www.zkoss.org/forum/index.zul#path%3DlistComment%3BdiscussionId%3D7596%3BcategoryId%3D14%3B
and there is also a feature request:
http://sourceforge.net/tracker/index.php?func=detail&aid=2114050&group_id=152762&atid=785191
According to the above thread I changed the zul file to use unique binder variable names. I simply use <listitem self="@{each=filterDepartment}"> and <listcell label="@{filterDepartment.name}"> in the department filter listbox and it seems to work.
I know I should search the forum before I ask:)
Anyway thanks for everyone.
Tom
In my case I had kind of problem:
index.zul:
<?component name="myComponent" inline="true" macroURI="_myComponent.zul"?>
<customGrid>
...
<row self="@{each=object}" value="@{object}">
<customDetail>
<myComponent/>
</customDetail>
</row>
...
</customGrid>
_myComponent.zul
<customGrid model="@{object.getList}">
<listbox model="@{object.getDataForListBox}">
...
</listbox>
</customGrid>
And I had exception "Cannot find associated CollectionItem" with expession:object.getDataForListBox
How I solved this problem:
_myComponent.zul
<customGrid model="@{object.getList}">
<listbox forEach="@{object.getDataForListBox}">
...
</listbox>
</customGrid>
Asked: 2009-10-12 13:05:01 +0800
Seen: 359 times
Last updated: Sep 06 '16