/*
* 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.examples.ajax.builtin;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.IAjaxCallDecorator;
import org.apache.wicket.ajax.calldecorator.AjaxCallDecorator;
import org.apache.wicket.ajax.form.AjaxFormSubmitBehavior;
import org.apache.wicket.examples.guestbook.Comment;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.basic.MultiLineLabel;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.TextArea;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.CompoundPropertyModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.model.PropertyModel;
/**
* Ajax enabled example for the guestbook.
*
* @author Martijn Dashorst
*/
public class GuestBook extends BasePage
{
/** A global list of all comments from all users across all sessions */
public static final List commentList = new ArrayList();
/** The list view that shows comments */
private final ListView commentListView;
/** Container for the comments, used to update the listview. */
private WebMarkupContainer comments;
/** The textarea for entering the comments, is updated in the ajax call. */
private Component text;
/**
* Constructor.
*/
public GuestBook()
{
// Add comment form
CommentForm commentForm = new CommentForm("commentForm");
add(commentForm);
// the WebMarkupContainer is used to update the listview in an ajax call
comments = new WebMarkupContainer("comments");
add(comments.setOutputMarkupId(true));
// Add commentListView of existing comments
comments.add(commentListView = new ListView("comments", new PropertyModel(this,
"commentList"))
{
public void populateItem(final ListItem listItem)
{
final Comment comment = (Comment)listItem.getModelObject();
listItem.add(new Label("date", new Model(comment.getDate())));
listItem.add(new MultiLineLabel("text", comment.getText()));
}
});
// we need to cancel the standard submit of the form in the onsubmit handler,
// otherwise we'll get double submits. To do so, we return false after the
// ajax submit has occurred.
// The AjaxFormSubmitBehavior already calls the onSubmit of the form, all
// we need to do in the onSubmit(AjaxRequestTarget) handler is do our Ajax
// specific stuff, like rendering our components.
commentForm.add(new AjaxFormSubmitBehavior(commentForm, "onsubmit")
{
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return new AjaxCallDecorator()
{
public CharSequence decorateScript(CharSequence script)
{
return script + "return false;";
}
};
}
protected void onSubmit(AjaxRequestTarget target)
{
// add the list of components that need to be updated
target.addComponent(comments);
target.addComponent(text);
// focus the textarea again
target.appendJavascript("document.getElementById('" + text.getMarkupId()
+ "').focus();");
}
});
}
/**
* A form that allows a user to add a comment.
*
* @author Jonathan Locke
*/
public final class CommentForm extends Form
{
/**
* Constructor
*
* @param id
* The name of this component
*/
public CommentForm(final String id)
{
// Construct form with no validation listener
super(id, new CompoundPropertyModel(new Comment()));
// Add text entry widget
text = new TextArea("text").setOutputMarkupId(true);
add(text);
}
/**
* Show the resulting valid edit
*/
public final void onSubmit()
{
// Construct a copy of the edited comment
final Comment comment = (Comment)getModelObject();
final Comment newComment = new Comment(comment);
// Set date of comment to add
newComment.setDate(new Date());
// Add the component we edited to the list of comments
commentList.add(0, newComment);
// Clear out the text component
comment.setText("");
}
}
/**
* Clears the comments.
*/
public static void clear()
{
commentList.clear();
}
}