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How to add or delete a Grid row (or register) without reseting all the Grid components values

asked 2011-10-10 16:25:47 +0800

carpolva gravatar image carpolva
155 4

updated 2011-10-10 16:49:31 +0800

Hello guys.

My issue is simple: I have a Grid composed of textboxes, comboboxes, etc., in my screen I have a button for adding new registers (or rows) to this grid but when I add a new register all the Grid components are reset and I lose previously entered values in the components. My question is similar to: http://www.zkoss.org/forum/listComment/9175/1/20/

Here's part of my code for better understanding:

page.zul grid (simplified)

<grid model="@{ejemploBean.allEvents, load-after='btnAdd.onClick'}" width="1600px">
    	<columns>
    		<column width="40px">Nro.</column>
    		<column width="180px">Actividades</column>
    		<column width="50px">Lunes</column>
    	</columns>
    	<rows>
    		<row self="@{each='data'}">
    			<!-- Nro. -->
    			<label value="@{data.counter}"/>
    			
    			<!-- Actividades -->
    			<combobox  model="@{data.actividades}" onAfterRender="self.setSelectedIndex(0)"/>
              	
              	<!-- Lunes -->
              	<intbox value="0" constraint="no negative,no empty">
              		<attribute name="onChange">
	                <![CDATA[
						lblLunes.setValue(ejemploBean.sumarValorColumna(self,"Lunes"));
						ejemploBean.sumaTotales();
	                ]]>
	                </attribute>
              	</intbox>
    		</row>
    	</rows>
    </grid>

Next is the class EjemploBean.java where the grid's model is the variable named "lista" composed with a normal bean (TablaBean) and is returned in the getAllEvents() method, "bandera" is a boolean (if it's false is because the page is loaded first time, so, don't create again the list when I add new registers, I put this 'cause getAllEvents() method is invoked every time I add a new register because of the load-after='btnAdd.onClick' in my .zul page). In the onClick$btnAdd I add the new records to the list, and the Grid is reloaded again by the load-after method with the new rows or registers.

public List<TablaBean> getAllEvents() {
		if(!bandera){
			for(int i=1; i<=4; i++){
				TablaBean myBean = new TablaBean();
				myBean.setCounter(i);
				lista.add(myBean);
				
				for(int j=0; j<7; j++){
					observaciones.add("");
				}
			}
		}
		bandera = true;

		return lista;
	}


This is onClick of the Add Button:

public void onClick$btnAdd() {
		int size = 0;
		Integer cantidad = iboxRegistros.getValue();
		
		for(int i=0; i<cantidad; i++){
			size = lista.size();
			
			TablaBean myBean = new TablaBean();
			myBean.setCounter(size+1);
			
			lista.add(myBean);
			for(int j=0; j<7; j++){
				observaciones.add("");
			}
		}
	}


I'll appreciate any help, maybe I'll bind each row component value in a TablaBean object and save each one in memory.

Is there a better way to do this?.

Best regards.

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answered 2011-10-10 20:19:26 +0800

RichardL gravatar image RichardL
768 4

I'm not sure if I fully understand but if you just want to add a new row to the grid you could you use ListModelList as your model and just add each row instead of loading the grid each time.

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answered 2011-10-11 07:45:47 +0800

carpolva gravatar image carpolva
155 4

Hi RichardL, thanks for your response. The fact is that actually I've developed some examples with <listbox> using listmodellist as its model, for example:

<listbox rows="5" model="@{win$composer.allEvents, load-after='add.onClick'}" 
		selectedItem="@{win$composer.current}">
		<listhead>
			<listheader label="Item" />
		</listhead>		
		<listitem self="@{each='event'}" value="@{event}">			
			<listcell label="@{event.name}" />
		</listitem>
	</listbox>

... and It works pretty well, but I see that a Listbox has child components like <listitem> and <listcell> ... how can I use a <combobox> , <textbox> or <intbox> inside a listbox?. For example, if I put:

<listitem self="@{each='event'}" value="@{event}">			
	<textbox value="@{event.name}"/>
</listitem>

It generates the following exception: org.zkoss.zk.ui.UiException: Unsupported child for listitem: <Textbox null>, I'll try the following in Javacode and tell you later if I succeeded:

ListItem item = new Listitem();
Listcell cell = new Listcell();
Textbox txt = new Textbox();
cell.appendChild(txt);
item.appendChild(cell);

Regards.

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answered 2011-10-11 08:59:28 +0800

carpolva gravatar image carpolva
155 4

Hi. I was able to append any component (intbox, textbox, etc) in my listcell... but when I add a new row, all the previous entered data still dissapears, so, I'm still in trouble jeje :(

What do you mean with "use ListModelList as your model and just add each row instead of loading the grid each time"?, because if I use a listmodelList as my listbox's model I need to specify the "load-after='add.onClick" sentence to see the added row, or is there another way?.

Thanks for the help.

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answered 2011-10-12 03:30:30 +0800

matthewgo gravatar image matthewgo
375

Hi

You can use "ListModelList" to render the row automatically instead of using "List" and triggering load-after.
(because load-after is registered to model, it will re-render all grid rows)

ListModelList is alive list. Registered with onChange event, it will detect the change on itself and then notify the grid to render the change.

ListModelLit lista;
public ListModelLit  getAllEvents() {

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answered 2011-10-12 08:47:06 +0800

carpolva gravatar image carpolva
155 4

Hi Matthewgo, RichardL, thank you very much for your responses. Actually I made it! jeje. I can add a new row without reseting the previous entered data in any grid row (intbox, datebox in my example). I only have a question, I'm still using the load-after='btnAdd.onClick' sentence in my grid's model but now the entered values are not reset, any idea?.

The following is my working example (maybe it'll be useful for someone):

todo.zul

<?page title="Todo Example"?>
<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit"?>

<window id="win" width="360px" apply="${sessionScope.myController}">
	<grid model="@{win$composer.myList, load-after='btnAdd.onClick'}" width="360px">
		<columns>
    		<column width="100px">Item</column>
    		<column width="100px">Priority</column>
    		<column width="150px">Date</column>
    	</columns>
    	<rows>
    		<row self="@{each='event'}">
    			<label value="@{event.id}"/>
    			<intbox value="@{event.priority}" constraint="no negative,no empty"/>
    			<datebox value="@{event.date}"/>
    		</row>
    	</rows>
	</grid>
	<label value="New Registers"/><intbox id="myIntBox" value="0"/><button id="btnAdd" label="Add"/>
</window>

EventController.java

public class EventController extends GenericForwardComposer {

	ListModelList myList;
	
	Intbox myIntBox;
	
	public EventController(){
		myList = new ListModelList();
		for(int i=1; i<6; i++){
			TodoEvent evento = new TodoEvent(""+i, "Nombre"+i, i, new Date());
			myList.add(evento);
		}
	}
	
	public void onClick$btnAdd() {
		Integer size = myList.size()+1;
		Integer cantidad = myIntBox.getValue();

		for(int i=0; i<cantidad; i++){
			TodoEvent myBean = new TodoEvent(""+size, "Nombre"+size, size, new Date());
			myList.add(myBean);
			size++;
		}
	}

	public ListModelList getMyList() {
		return myList;
	}

	public void setMyList(ListModelList myList) {
		this.myList = myList;
	}
}

Regards.

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answered 2011-10-12 09:00:56 +0800

RichardL gravatar image RichardL
768 4

Nice job, now the load-after is registered to ListModelList

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answered 2011-10-12 14:18:40 +0800

carpolva gravatar image carpolva
155 4

Thanks guys for your help, now it works pretty well. Now I've a last issue related to this thread (sorry, I'm a beginner in ZK jeje):

I add rows to my grid and it doesn't reset the previous entered values in grid row components like textboxes, intboxes or dateboxes (just like code shown above)... but if I use comboboxes is different, all the previous comboboxes selected options are reset.

This is where I define the combobox in my .zul page:

        <rows>
    		<row self="@{each='event'}">
    			<label value="@{event.id}"/>
    			<intbox value="@{event.priority}" constraint="no negative,no empty"/>
    			<datebox value="@{event.date}"/>
    			<combobox model="@{event.myCombo}" onAfterRender="self.setSelectedIndex(0)"/>
    		</row>
    	</rows>

In the Java class, myCombo is a ListModelList, for example:

myCombo = new ListModelList();
myCombo.add("Please select...");
myCombo.add("Option1");
myCombo.add("Option2");
myCombo.add("Option3");

I'll appreciate any related help, you're my last hope! :D

Best regards.

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Asked: 2011-10-10 16:25:47 +0800

Seen: 469 times

Last updated: Oct 12 '11

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