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Difference between use="" and apply=""

asked 2008-11-19 09:23:00 +0800

terrytornado gravatar image terrytornado flag of Germany
9393 3 7 16
http://www.oxitec.de/

updated 2008-11-19 09:26:27 +0800

Hiho all,

i'm heavily learning ZK. Most time it makes fun. At time i'm figthing with the implementation from my spring/hibernate backend (services/dao/model) from an other project.

Can someonye explain me (in easy words, i.e. with example) what is the difference between use="" and apply="". At time i have problems to access my spring controlled beans in a .zul file.
Sometimes i have only access to methods by using the use="org.myfirm.sampleapp.Class". But with the full qualified packagename it goes around spring, i mean.

Thanks for everybody
Stephan

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answered 2008-11-19 09:48:32 +0800

ziccardi gravatar image ziccardi
321 7

The use, means you want to reimplement the component.

For example, if you write:

<window use="myWinClass">
</window>

Then, when the zul component 'window' of this page is created, an instance of myWinClass will be created instead of a Window.
Obviously, myWinClass should extend Window.

If you use the 'apply', you are just linking a Composer to your component.
In my opinion, you'll need a Composer instead of the 'use' in the 99% of the cases.

There is a beautiful documentation about composers at : http://www.zkoss.org/smalltalks/mvc3/

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answered 2008-11-19 10:09:20 +0800

terrytornado gravatar image terrytornado flag of Germany
9393 3 7 16
http://www.oxitec.de/

@ziccardi,

many thanks.
I will read the article today.

Stephan

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answered 2008-11-19 16:27:04 +0800

terrytornado gravatar image terrytornado flag of Germany
9393 3 7 16
http://www.oxitec.de/

updated 2008-11-19 21:11:59 +0800

Yes, this article was helpful.

I changed my code for a button event like the example class with extends Window implements AfterCompose.

But.. this doesn't work for follow szenario. I have a Listbox with records of customers and on the end of each line there is a button for calling the customers dialog with the selected cutomer record. In that case i cannot give the buttons an id because they are created dynamically for each customers record.

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answered 2008-11-20 05:01:32 +0800

robertpic71 gravatar image robertpic71
1275 1

updated 2008-11-20 05:02:34 +0800

>> But.. this doesn't work for follow szenario. I have a Listbox with records of customers and on the end of each line there is a button for calling the customers
>> dialog with the selected cutomer record. In that case i cannot give the buttons an id because they are created dynamically for each customers record.
How do create you Listbox?
forEach, model + Render, pure Java, @databinding

However the fowardutil is pretty smart and handels templates from forEach and @databinding. I.e. the following code works:

<rows id="tableGridRows">
			<row self="@{each=entry}">
				<intbox value="@{entry.mfifir}" cols="2" maxlength="2" format="##" tooltip="help"/>
				<label value="@{entry.mfifirkbez}" tooltip="help"/>
                                ...
				<image id="trash" src="images/trash empty_24.png" hover="images/trash full_24.png"/>
			</row>
		</rows>	

in my Javaclass (could be ext. Window or Composer)
public void onClick$trash(Event event) { // handels onClick from trashicon

The Databinding use the zul-defintion as template and "clone" this for alle entries.

However if you fill your listbox without zul-definition in java it should work with button.addForward
i.e.

button.addForward("onClick", win, "onClickTrash");

Note:
onClick = Event
win = Namespaceowner / Rootcomponent --> Targetcomponent who handels the event (use=java.class or apply=composer.class)
onClickTrash = TargetEvent -> methodname from the eventcatcher
public void onClickTrash(Event event) { // handels onClick from trashbutton

Don't use the $ in you manuals Eventhandlers.

Testet with a normal button (i have no lists without databinding here).

/Robert

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answered 2008-11-20 07:41:15 +0800

ziccardi gravatar image ziccardi
321 7

The solution depends on how you implemented your code.
I suppose you use a model and a renderer to populate your list.

To solve your problem, you can use the following method.

Inside the renderer:

public void render(Listitem item, Object obj)
{
   // Create your row
   // ...

   // Now it's time to create the button:
   Button btn = new Button();
   // Configure your button with your label, etc...
   // Now that your button is ready, add this (I save the data as button attribute):
   btn.addAttribute("CUSTOMERDATA", obj);
   ComponentsCtrl.applyForward(btn, "onClick=onButtonHasClickedInList");
}

Now, inside the composer:


// ...
// Your composer code
// ...

// Here is the method that will handle the clicks on the list buttons:

public void onButtonHasClickedInList(Event evt)
{
   // The event is a ForwardEvent...
   ForwardEvent fe = (ForwardEvent) evt;
   // Getting the original Event
   Event evt = fe.getOrigin();

   // Getting the component that triggered the original event (i.e. the button)
   Button btn = (Button) evt.getTarget();

   // Getting the Customer Data (it can be any type. for the example, I'll use Object)..
   // Each button will have it's own customer data instance
   Object obj = btn.getAttribute("CUSTOMERDATA");
   
   // Do what you want with the customer data

}

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answered 2008-11-20 12:29:46 +0800

terrytornado gravatar image terrytornado flag of Germany
9393 3 7 16
http://www.oxitec.de/

updated 2008-11-20 12:33:32 +0800

@zicardi
@robertpic

thanks for the answering. At time technically i cannot copy the code here in. i will do it on evening.

I have several problems/errors at the same time

1. I work with spring managed beans.
2. I don't know how to call a spring managed bean methode from a <zscript> </zcsipt>
to get my Dialog in a hard way for testing the composer events. When i do it with new Bean() it crashes on the next time i probe the composer event.
3. yet my listbox looks like a jsf listbox. so the listItems are filled with the foreach=${customerListBean.allCustomer}". The buttons are created on same way.

I cannot test these button events in composer for each row because i cannot give them an id. By doing this after the second row i became an error for duplicate button ids.

I will post the zul-file this evening. and i know this is the false way. but it's my first try. I hope
you can put it in a right way. :-)

Stephan

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answered 2008-11-20 13:47:30 +0800

ziccardi gravatar image ziccardi
321 7

Hi Stephan.

>I cannot test these button events in composer for each row because
>i cannot give them an id. By doing this after
>the second row i became >an error for duplicate button ids.

If you use the method I told before (the forward), you don't need to give the button an id.

An example could be (I didn't check, so maybe you'll find some typo):

<zk>
<zscript>
class comp extends org.zkoss.zk.ui.util.GenericForwardComposer
{
   public void onButtonClicked(Event evt)
   {
       ForwardEvent fe = (ForwardEvent) evt;
       Event e = fe.getOrigin();
       Button btn = (Button) e.getTarget();
       alert ("LIST ITEM DATA : " + btn.getAttribute("DATA"));

   }
}
</zscript>
<window title="Listbox" border="normal" use="comp">
	<vbox>
		<listbox width="250px" id="myList">
			<listhead sizable="true">
				<listheader label="Name" sort="auto"/>
				<listheader label="Action"/>
			</listhead>
		</listbox>
               <zscript>
<![CDATA[

    List data = new ArrayList();
    for (int i = 0; i < 2; )
       data.add("ITEM : " + ++i);

myList.setModel(new ListModelList(data));

myList.setItemRenderer(
new ListitemRenderer()
{
   void render(Listitem item,
               java.lang.Object data)
   {
      Listcell cell = new Listcell();

      Label lbl = new Label(data.toString());
      lbl.setParent(cell);
      cell.setParent(item);

      Listcell cell = new Listcell();
      Button btn = new Button();
      btn.setLabel("Click me");
      btn.setParent(cell);
      btn.setAttribute("DATA", data);
      cell.setParent(item);
      ComponentsCtrl.applyForward(btn, "onClick=onButtonClicked");
   }
}
);


]]>
</zscript>
	</vbox>
</window>
</zk>

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answered 2008-11-20 14:37:04 +0800

terrytornado gravatar image terrytornado flag of Germany
9393 3 7 16
http://www.oxitec.de/

@ziccardi

i will jump from the house. :-((

I cannot test it. I have seen in the mvc tutorial that others have use and apply with the '$' for spring beans. Why does this not works for me :-((((((((((((((

ZK error: java.lang.ClassCastException: org.myfirm.bean.KundeListBean$$EnhancerByCGLIB$$3b267775 cannot be cast to java.lang.String.

AArgh, all times i have errors that seems that i'm the only with it.

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answered 2008-11-20 15:36:17 +0800

ziccardi gravatar image ziccardi
321 7

Hi Stephan.

The
>ZK error: java.lang.ClassCastException: org.myfirm.bean.KundeListBean$$EnhancerByCGLIB$$3b267775 cannot be cast to java.lang.String.

means that you are trying to cast an CGLIB enhanched class (KundeListBean) to a string.

Where the error happens, try to cast it to a KundeListBean instead than String...

Hope this helps.

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answered 2008-11-20 15:36:20 +0800

robertpic71 gravatar image robertpic71
1275 1

>> I cannot test it. I have seen in the mvc tutorial that others have use and apply with the '$' for spring
>> beans. Why does this not works for me :-((((((((((((((

I see no variable-resolver in your posted zul-file.
<?variable-resolver class="org.zkoss.zkplus.spring.DelegatingVariableResolver"?>

/Robert

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Asked: 2008-11-19 09:23:00 +0800

Seen: 5,752 times

Last updated: Jan 18 '11

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