Wicket Kendo UI: multi-select

MultiSelect: lazy load

Components / Samples

Description

This sample shows how to use the Kendo UI MultiSelect with lazy loading choices.

Note

This MultiSelect implementation - in the "lazy" package - differs from the other one as it does not inherit from ListMultipleChoice built-in component.

Warning

Do not re-attach the MultiSelect directly to the AjaxRequestTarget, attach its container instead (the form for instance)

Since

wicket-kendo-ui-6.14.0

Licensing

Kendo UI "Core" is Apache License 2.0 licensed, starting from version 2014.1.416.
Prior to version 2014.1.416, Kendo UI "Web" was licensed under GPLv3.

A pro version - with a commercial license - is also available, it provides additional widgets (see http://docs.telerik.com/kendo-ui/intro/supporting/list-of-widgets)
To be able to use it, you need to change the ResourceReference with kendo.all.min.js

Sources

Java
HTML
CSS

package com.googlecode.wicket.jquery.ui.samples.kendoui.multiselect;

import java.util.Arrays;
import java.util.List;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.lang.Generics;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.googlecode.wicket.kendo.ui.form.button.AjaxButton;
import com.googlecode.wicket.kendo.ui.form.button.Button;
import com.googlecode.wicket.kendo.ui.form.multiselect.lazy.MultiSelect;
import com.googlecode.wicket.kendo.ui.panel.KendoFeedbackPanel;

public class LazyMultiSelectPage extends AbstractMultiSelectPage
{
	private static final long serialVersionUID = 1L;
	private static final Logger LOG = LoggerFactory.getLogger(LazyMultiSelectPage.class);
	private static final List<String> GENRES = Arrays.asList("Black Metal", "Death Metal", "Doom Metal", "Folk Metal", "Gothic Metal", "Heavy Metal", "Power Metal", "Symphonic Metal", "Trash Metal", "Vicking Metal");

	public LazyMultiSelectPage()
	{
		Form<Void> form = new Form<Void>("form");
		this.add(form);

		// FeedbackPanel //
		final KendoFeedbackPanel feedback = new KendoFeedbackPanel("feedback");
		form.add(feedback);

		// MultiSelect //
		List<String> selected = Generics.newArrayList();
		selected.add("Heavy Metal");
		selected.add("Trash Metal");

		final MultiSelect<String> multiselect = new MultiSelect<String>("select", Model.ofList(selected)) {

			private static final long serialVersionUID = 1L;

			@Override
			public List<String> getChoices()
			{
				try
				{
					// simulate load duration //
					Thread.sleep(500);
				}
				catch (InterruptedException e)
				{
					if (LOG.isDebugEnabled())
					{
						LOG.debug(e.getMessage(), e);
					}
				}

				return GENRES;
			}
		};

		form.add(multiselect.setOutputMarkupId(true));

		// Buttons //
		form.add(new Button("submit") {

			private static final long serialVersionUID = 1L;

			@Override
			public void onSubmit()
			{
				LazyMultiSelectPage.this.info(multiselect);
			}
		});

		form.add(new AjaxButton("button") {

			private static final long serialVersionUID = 1L;

			@Override
			protected void onSubmit(AjaxRequestTarget target)
			{
				LazyMultiSelectPage.this.info(multiselect);
				target.add(feedback);
			}
		});
	}

	private void info(MultiSelect<String> multiselect)
	{
		Object choice = multiselect.getModelObject();

		this.info(choice != null ? choice.toString() : "no choice");
	}
}

<!DOCTYPE html>
<html xmlns:wicket="http://wicket.apache.org">
<head>
<wicket:head>
	<title>Wicket Kendo UI: multi-select</title>
</wicket:head>
</head>
<body>
<wicket:extend>
	<div id="demo-panel">
		<form wicket:id="form">
			<select wicket:id="select" style="width: 460px;"></select>
			<br/>
			<button wicket:id="submit" type="submit">Submit</button>
			<button wicket:id="button">Ajax Button</button>
			<br/><br/>
			<div wicket:id="feedback" style="width: 460px;"></div>
		</form>
	</div>
</wicket:extend>
</body>
</html>

Wicket - jQuery UI