/*
* 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.ajax.form;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.ajax.AjaxEventBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.markup.html.form.persistence.IValuePersister;
import org.apache.wicket.markup.html.form.validation.IFormValidator;
import org.apache.wicket.util.string.AppendingStringBuffer;
/**
* A behavior that updates the hosting FormComponent via ajax when an event it is attached to is
* triggered. This behavior encapsulates the entire form-processing workflow as relevant only to
* this component so if validation is successful the component's model will be updated according to
* the submitted value.
* <p>
* NOTE: This behavior does not support persisting form component values into cookie or other
* {@link IValuePersister}. If this is necessary please add a request for enhancement.
* <p>
* NOTE: This behavior does not validate any {@link IFormValidator}s attached to this form even
* though they may reference the component being updated.
* <p>
* NOTE: This behavior does not work on Choices or Groups use the
* {@link AjaxFormChoiceComponentUpdatingBehavior} for that.
*
* @since 1.2
*
* @author Igor Vaynberg (ivaynberg)
*/
public abstract class AjaxFormComponentUpdatingBehavior extends AjaxEventBehavior
{
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Construct.
*
* @param event
* event to trigger this behavior
*/
public AjaxFormComponentUpdatingBehavior(final String event)
{
super(event);
}
/**
*
* @see org.apache.wicket.behavior.AbstractAjaxBehavior#onBind()
*/
protected void onBind()
{
super.onBind();
if (!(getComponent() instanceof FormComponent))
{
throw new WicketRuntimeException("Behavior " + getClass().getName() +
" can only be added to an instance of a FormComponent");
}
}
/**
*
* @return FormComponent
*/
protected final FormComponent getFormComponent()
{
return (FormComponent)getComponent();
}
/**
* @see org.apache.wicket.ajax.AjaxEventBehavior#getEventHandler()
*/
protected final CharSequence getEventHandler()
{
return generateCallbackScript(new AppendingStringBuffer("wicketAjaxPost('").append(
getCallbackUrl(false)).append(
"', wicketSerialize(Wicket.$('" + getComponent().getMarkupId() + "'))"));
}
/**
* @see org.apache.wicket.ajax.AjaxEventBehavior#onCheckEvent(java.lang.String)
*/
protected void onCheckEvent(String event)
{
if ("href".equalsIgnoreCase(event))
{
throw new IllegalArgumentException(
"this behavior cannot be attached to an 'href' event");
}
}
/**
*
* @see org.apache.wicket.ajax.AjaxEventBehavior#onEvent(org.apache.wicket.ajax.AjaxRequestTarget)
*/
protected final void onEvent(final AjaxRequestTarget target)
{
final FormComponent formComponent = getFormComponent();
if (getEvent().toLowerCase().equals("onblur") && disableFocusOnBlur())
{
target.focusComponent(null);
}
try
{
formComponent.inputChanged();
formComponent.validate();
if (formComponent.hasErrorMessage())
{
formComponent.invalid();
onError(target, null);
}
else
{
formComponent.valid();
if (getUpdateModel())
{
formComponent.updateModel();
}
onUpdate(target);
}
}
catch (RuntimeException e)
{
onError(target, e);
}
}
/**
* @return true if the model of form component should be updated, false otherwise
*/
protected boolean getUpdateModel()
{
return true;
}
/**
* Determines whether the focus will not be restored when the event is blur. By default this is
* true, as we don't want to re-focus component on blur event.
*
* @return
*/
protected boolean disableFocusOnBlur()
{
return true;
}
/**
* Listener invoked on the ajax request. This listener is invoked after the component's model
* has been updated.
*
* @param target
*/
protected abstract void onUpdate(AjaxRequestTarget target);
/**
* Called to handle any error resulting from updating form component. Errors thrown from
* {@link #onUpdate(AjaxRequestTarget)} will not be caught here.
*
* The RuntimeException will be null if it was just a validation or conversion error of the
* FormComponent
*
* @param target
* @param e
*/
protected void onError(AjaxRequestTarget target, RuntimeException e)
{
if (e != null)
{
throw e;
}
}
}