org.apache.wicket.markup.html.form.AbstractCheckSelector Maven / Gradle / Ivy

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Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.markup.html.form;

import java.util.Arrays;

import org.apache.wicket.ajax.WicketEventJQueryResourceReference;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.head.HeaderItem;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.OnLoadHeaderItem;
import org.apache.wicket.markup.html.IHeaderContributor;
import org.apache.wicket.request.resource.JavaScriptResourceReference;
import org.apache.wicket.request.resource.ResourceReference;

/**
 * Base class for all Javascript-based "select-all" checkboxes. Provides a simple "select all"
 * checkbox which can be automatically updated based on the selection state of the checkboxes it
 * controls (see {@link #wantAutomaticUpdate()}).
 * 
 * @see CheckboxMultipleChoiceSelector
 * @see CheckGroupSelector
 * @see CheckBoxSelector
 * 
 * @author Carl-Eric Menzel 
 */
public abstract class AbstractCheckSelector extends LabeledWebMarkupContainer
	implements
		IHeaderContributor
{
	private static final long serialVersionUID = 1L;

	private static final ResourceReference JS = new JavaScriptResourceReference(
		AbstractCheckSelector.class, "CheckSelector.js")
	{

		/**
		 */
		private static final long serialVersionUID = 1L;

		@Override
		public Iterable getDependencies()
		{
			return Arrays.asList(JavaScriptHeaderItem.forReference(WicketEventJQueryResourceReference.get()));
		};
	};

	/**
	 * Construct.
	 * 
	 * @param id
	 *            the component id
	 */
	public AbstractCheckSelector(String id)
	{
		super(id);
		setOutputMarkupId(true);
	}

	/**
	 * @return Whether the individual checkboxes should update the state of the Selector. If true,
	 *         then when a checkbox is clicked, the state of all checkboxes is tested - if all are
	 *         checked, the selector is checked too. If not, the selector is unchecked.
	 */
	protected boolean wantAutomaticUpdate()
	{
		return true;
	}

	@Override
	public void renderHead(IHeaderResponse response)
	{
		response.render(JavaScriptHeaderItem.forReference(JS));

		String findCheckboxes = getFindCheckboxesFunction().toString();

		// initialize the selector
		response.render(OnLoadHeaderItem.forScript("Wicket.CheckboxSelector.initializeSelector('" +
			this.getMarkupId() + "', " + findCheckboxes + ");"));
		if (wantAutomaticUpdate())
		{
			// initialize the handlers for automatic updating of the selector state
			response.render(OnLoadHeaderItem.forScript("Wicket.CheckboxSelector.attachUpdateHandlers('" +
				this.getMarkupId() + "', " + findCheckboxes + ");"));
		}
	}

	@Override
	protected void onComponentTag(ComponentTag tag)
	{
		super.onComponentTag(tag);
		if (isEnableAllowed() && isEnabledInHierarchy())
		{
			tag.remove("disabled");
		}
		else
		{
			tag.put("disabled", "disabled");
		}
		checkComponentTag(tag, "input");
		checkComponentTagAttribute(tag, "type", "checkbox");
	}

	/**
	 * Concrete subclasses must override this to provide a Javascript function that returns the IDs
	 * of all checkboxes that should be controlled by this selector.
	 * 
	 * @return a String containing a Javascript expression that evaluates to a function(!). This
	 *         function must return an array containing the IDs of all checkbox input elements that
	 *         this selector should control.
	 */
	protected abstract CharSequence getFindCheckboxesFunction();
}