Is it possible to access a nested object using data binding?

answered 2009-12-13 20:28:00 +0800

joylo0122
688 ● 1
www.zkoss.org

@fmcypriano

Hi fmcypriano, I think "@{foo.bar.name}" isn't work because databinding won't know the value that Foo doesn't know.
It's impossible for class Foo to know what name is the bar unless you write a method return it. So i will suggest you
to write a method return the correct name of bar, and use "@{foo.xxx}" to get it.

/Joy

answered 2009-12-14 02:11:59 +0800

tomCat
276 ● 3

updated 2009-12-14 02:48:50 +0800

Hi,

"@{foo.bar.name}" should work. Here is a little example code, which works as expected:

Bar.java

public class Bar {

private String name;

public void setName(String name) {
this.name = name;
}

public String getName() {
return name;
}
}

Foo.java:
public class Foo {

private Bar bar;

public void setBar(Bar bar){
this.bar = bar;
}

public Bar getBar() {
return bar;
}
}

MyController.java:
public class MyController extends GenericForwardComposer {

private List<Foo> fooList = new ArrayList<Foo>();

@Override
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);

Foo foo = new Foo();
Bar bar = new Bar();
bar.setName("fooBar");
foo.setBar(bar);

fooList.add(foo);

DataBinder binder = new AnnotateDataBinder(comp);
binder.loadAll();
}

public List<Foo> getFooList() {
return fooList;
}

}

index.zul:
<window id="main" title="Hello World!!" border="normal" width="100%" apply="controller.MyController">

<grid model="@{main$composer.fooList}">
<rows>
<row self="@{each=foo}">
<label value="@{foo.bar.name}" />
</row>
</rows>
</grid>

</window>

Tested with zk5 and 3.6.3.

Best regards,

tomCat

(Sorry for the bad format, but the source code tag does not work :( )

answered 2009-12-14 03:17:42 +0800

joylo0122
688 ● 1
www.zkoss.org

@tomCat

Thanks tomCat!!
That's another way to make @{foo.bar.name} work and don't need to change code both in java class and zul page.

If the codes are not heavy, you can use my way, cause it's easier to write another method instead to create a composer, but i'll
need to modified codes in two places. If codes are heavy, tomCat give a great suggestion!

/Joy