Theme:
Processing...
Description & Source Code

With the load on demand feature, data in grid is not loaded until the requested data is needed in view. The grouping of grid data is achieved using org.zkoss.zul.SimpleGroupsModel, which supports the load on demand feature.

load_on_demand_view.zul
<div apply="demo.grid.load_on_demand.LoadOnDemandController">
	<grid height="400px" model="${$composer.mailData}">
		<columns>
			<column label="From" width="100px" />
			<column label="Subject" />
			<column label="Received" width="150px" />
			<column label="Size" width="100px" />
		</columns>
		<template name="model:group">
			<group label="${each}" />
		</template>
		<template name="model">
			<row>
				<div>
					<image style="padding: 0px 10px"
						src="/img/Centigrade-Widget-Icons/EnvelopeOpen-16x16.png" />
					<label value="${each.index}" />
				</div>
				<label value="${each.subject}" />
				<label value="${each.date}" />
				<label value="${each.size}" />
			</row>
		</template>
	</grid>
</div>
LoadOnDemandController.java
package demo.grid.load_on_demand;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.select.SelectorComposer;
import org.zkoss.zul.GroupsModel;
import org.zkoss.zul.SimpleGroupsModel;

import demo.data.Mail;
import demo.data.MailModel;

public class LoadOnDemandController extends SelectorComposer<Component> {
	private static final long serialVersionUID = 1L;
	
	private final GroupsModel<Mail, Object, Object> groupsModel = 
			new SimpleGroupsModel<Mail, String, Object, Object>(MailModel.allData, MailModel.headers);

	public GroupsModel<Mail, Object, Object> getMailData() {
		return groupsModel;
	}
}
MailModel.java
package demo.data;

import java.util.ArrayList;
import java.util.List;

public class MailModel {
	
	public static final List<Mail> today = new ArrayList<Mail>();
	public static final List<Mail> yesterday = new ArrayList<Mail>();
	public static final List<Mail> lastweek = new ArrayList<Mail>();
	public static final List<List<Mail>> allData = new ArrayList<List<Mail>>();
	public static final List<String> headers = new ArrayList<String>();		
	
	//initial demo data
	static {
		today.add(new Mail(1, "[zk1 - Help] RE: Bandbox Autocomplete Problem", "2012/11/18 10:16:27", 16));
		today.add(new Mail(2, "[zk1 - Help] RE: Bandbox Autocomplete Problem", "2012/11/18 10:14:27", 18));
		today.add(new Mail(3, "[zk1 - Help] RE: Databinding with radiogroups", "2012/11/18 09:47:27", 12));
		today.add(new Mail(4, "[zk1 - Help] RE: It's not possible to navigate a listbox' ite", "2012/11/18 09:35:27", 12));
		today.add(new Mail(5, "[zk1 - Help] RE: ZK problem in dynamic menu", "2012/11/18 08:37:27", 12));
		today.add(new Mail(6, "[zk1 - Help] RE: FileUpload", "2012/11/18 08:27:57", 14));
		today.add(new Mail(7, "[zk1 - Help] RE: Datebox format", "2012/11/18 06:27:31", 11));
		today.add(new Mail(8, "[zk1 - Help] RE: Datebox format", "2012/11/18 06:17:22", 12));
		today.add(new Mail(9, "[zk1 - Help] FileUpload", "2012/11/18 05:07:25", 11));
		today.add(new Mail(10, "[zk1 - Help] FileUpload", "2012/11/18 05:07:25", 11));
		today.add(new Mail(11, "[zk1 - Help] FileUpload", "2012/11/18 05:07:25", 11));
		today.add(new Mail(12, "[zk1 - General] RE: Opening more than one new	browser window", "2012/11/18 04:44:17", 12));
		today.add(new Mail(13, "[zk1 - General] RE: Opening more than one new	browser window", "2012/11/18 04:44:17", 12));
		today.add(new Mail(14, "[zk1 - General] RE: Opening more than one new	browser window", "2012/11/18 04:44:17", 12));
		today.add(new Mail(15, "[zk1 - General] RE: Opening more than one new	browser window", "2012/11/18 04:44:17", 12));
		today.add(new Mail(16, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/18 04:31:12", 14));
		today.add(new Mail(17, "Where is the demo?", "2012/11/18 04:31:12", 14));
		today.add(new Mail(18, "Where is your product page?", "2012/11/18 04:31:12", 14));
		today.add(new Mail(19, "ZK information required!", "2012/11/18 04:31:12", 14));

		yesterday.add(new Mail(1, "[zk1 - General] RE: Opening more than one new browser window", "2012/11/17 19:44:17", 39));
		yesterday.add(new Mail(2, "[zk1 - General] RE: Opening more than one new browser window", "2012/11/17 19:42:17", 35));
		yesterday.add(new Mail(3, "[zk1 - General] RE: Opening more than one new browser window", "2012/11/17 19:40:17", 26));
		yesterday.add(new Mail(4, "[zk1 - General] RE: Opening more than one new browser window", "2012/11/17 18:14:17", 27));
		yesterday.add(new Mail(5, "[zk1 - General] RE: Opening more than one new browser window", "2012/11/17 17:05:17", 18));
		yesterday.add(new Mail(6, "[zk1 - General] RE: Opening more than one new browser window", "2012/11/17 16:44:17", 19));
		yesterday.add(new Mail(7, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/17 13:31:12", 14));
		yesterday.add(new Mail(8, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/17 13:31:12", 14));
		yesterday.add(new Mail(9, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/17 13:31:12", 14));
		yesterday.add(new Mail(10, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/17 13:31:12", 14));
		yesterday.add(new Mail(11, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/17 13:26:37", 14));
		yesterday.add(new Mail(12, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/17 13:26:37", 14));
		yesterday.add(new Mail(13, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/17 13:26:37", 14));
		yesterday.add(new Mail(14, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/17 10:41:33", 14));
		yesterday.add(new Mail(15, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/17 10:14:27", 14));
		yesterday.add(new Mail(16, "[zk1 - Help] RE: Bandbox Autocomplete Problem", "2012/11/18 10:16:27", 16));
		yesterday.add(new Mail(17, "[zk1 - Help] RE: Bandbox Autocomplete Problem", "2012/11/18 10:14:27", 18));
		yesterday.add(new Mail(18, "[zk1 - Help] RE: Databinding with radiogroups", "2012/11/18 09:47:27", 12));
		yesterday.add(new Mail(19, "[zk1 - Help] RE: It's not possible to navigate a listbox' ite", "2012/11/18 09:35:27", 12));
	
		lastweek.add(new Mail(1, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/15 04:31:12", 14));
		lastweek.add(new Mail(2, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/15 04:31:12", 14));
		lastweek.add(new Mail(3, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/15 04:31:12", 14));
		lastweek.add(new Mail(4, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/15 03:26:37", 14));
		lastweek.add(new Mail(5, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/15 03:26:37", 14));
		lastweek.add(new Mail(6, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/15 03:26:37", 14));
		lastweek.add(new Mail(7, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/14 12:41:33", 14));
		lastweek.add(new Mail(8, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/14 02:41:33", 14));
		lastweek.add(new Mail(9, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/14 02:41:33", 14));
		lastweek.add(new Mail(10, "[zk1 - Help] RE: Times_Series Chart help", "2012/11/14 02:41:33", 14));
		lastweek.add(new Mail(11, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/13 02:14:27", 14));
		lastweek.add(new Mail(12, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/13 02:14:27", 14));
		lastweek.add(new Mail(13, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/13 02:14:27", 14));
		lastweek.add(new Mail(14, "[zk1 - Help] RE: SelectedItemConverter Question", "2012/11/13 02:14:27", 14));
		lastweek.add(new Mail(15, "[zk1 - Help] RE: Bandbox Autocomplete Problem", "2012/11/18 10:16:27", 16));
		lastweek.add(new Mail(16, "[zk1 - Help] RE: Bandbox Autocomplete Problem", "2012/11/18 10:14:27", 18));
		lastweek.add(new Mail(17, "[zk1 - Help] RE: Databinding with radiogroups", "2012/11/18 09:47:27", 12));
		lastweek.add(new Mail(18, "[zk1 - Help] RE: It's not possible to navigate a listbox' ite", "2012/11/18 09:35:27", 12));
		
		allData.add(today);
		allData.add(yesterday);
		allData.add(lastweek);

		headers.add("Date: Today");
		headers.add("Date: Yesterday");
		headers.add("Date: Last Week");
	}

}