/*
* 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 org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.convert.ConversionException;
import org.apache.wicket.util.string.StringValueConversionException;
import org.apache.wicket.util.string.Strings;
/**
* HTML checkbox input component.
* <p>
* Java:
*
* <pre>
* form.add(new CheckBox("bool"));
* </pre>
*
* HTML:
*
* <pre>
* <input type="checkbox" wicket:id="bool" />
* </pre>
*
* </p>
* <p>
* You can can extend this class and override method
* wantOnSelectionChangedNotifications() to force server roundtrips on each
* selection change.
* </p>
*
* @author Jonathan Locke
*/
public class CheckBox extends FormComponent implements IOnChangeListener
{
private static final long serialVersionUID = 1L;
/**
* @see org.apache.wicket.Component#Component(String)
*/
public CheckBox(final String id)
{
super(id);
}
/**
* @see org.apache.wicket.Component#Component(String, IModel)
*/
public CheckBox(final String id, IModel model)
{
super(id, model);
}
/**
* @see org.apache.wicket.markup.html.form.IOnChangeListener#onSelectionChanged()
*/
public void onSelectionChanged()
{
convert();
updateModel();
onSelectionChanged(getModelObject());
}
/**
* Template method that can be overriden by clients that implement
* IOnChangeListener to be notified by onChange events of a select element.
* This method does nothing by default.
* <p>
* Called when a option is selected of a dropdown list that wants to be
* notified of this event. This method is to be implemented by clients that
* want to be notified of selection events.
*
* @param newSelection
* The newly selected object of the backing model NOTE this is
* the same as you would get by calling getModelObject() if the
* new selection were current
*/
protected void onSelectionChanged(Object newSelection)
{
}
/**
* Whether this component's onSelectionChanged event handler should called
* using javascript if the selection changes. If true, a roundtrip will be
* generated with each selection change, resulting in the model being
* updated (of just this component) and onSelectionChanged being called.
* This method returns false by default.
*
* @return True if this component's onSelectionChanged event handler should
* called using javascript if the selection changes
*/
protected boolean wantOnSelectionChangedNotifications()
{
return false;
}
/**
* @see org.apache.wicket.MarkupContainer#getStatelessHint()
*/
protected boolean getStatelessHint()
{
if (wantOnSelectionChangedNotifications())
{
return false;
}
return super.getStatelessHint();
}
/**
* Processes the component tag.
*
* @param tag
* Tag to modify
* @see org.apache.wicket.Component#onComponentTag(ComponentTag)
*/
protected final void onComponentTag(final ComponentTag tag)
{
checkComponentTag(tag, "input");
checkComponentTagAttribute(tag, "type", "checkbox");
final String value = getValue();
if (value != null)
{
try
{
if (Strings.isTrue(value))
{
tag.put("checked", "checked");
}
else
{
// In case the attribute was added at design time
tag.remove("checked");
}
}
catch (StringValueConversionException e)
{
throw new WicketRuntimeException("Invalid boolean value \"" + value + "\"", e);
}
}
// Should a roundtrip be made (have onSelectionChanged called) when the
// checkbox is clicked?
if (wantOnSelectionChangedNotifications())
{
final CharSequence url = urlFor(IOnChangeListener.INTERFACE);
Form form = (Form)findParent(Form.class);
if (form != null)
{
tag.put("onclick", form.getJsForInterfaceUrl(url));
}
else
{
// NOTE: do not encode the url as that would give invalid
// JavaScript
tag.put("onclick", "window.location.href='" + url + "&" + getInputName()
+ "=' + this.checked;");
}
}
super.onComponentTag(tag);
}
/**
* @see FormComponent#supportsPersistence()
*/
protected final boolean supportsPersistence()
{
return true;
}
/**
* @see org.apache.wicket.markup.html.form.FormComponent#convertValue(String[])
*/
protected Object convertValue(String[] value)
{
String tmp = value != null && value.length > 0 ? value[0] : null;
try
{
return Strings.toBoolean(tmp);
}
catch (StringValueConversionException e)
{
throw new ConversionException("Invalid boolean input value posted \"" + getInput()
+ "\"", e).setTargetType(Boolean.class);
}
}
}