Wicket lab 5 為實作 簡單問答FAQ系統,
這裡使用了 AjaxLink 及 AjaxSubmitButton(AjaxButton) 元件,
實作了 ModelWindow 及 Panel, 並製作可重用的元件,
Wicket 提供了 WICKET AJAX DEBUG WINDOW, 這使用 ajax 的 debug 更方便.
執行畫面如下圖所示：
開始備忘記：
[1] 實作 lab 5
[1] 實作 lab 5：
<!------------- web.xml ----------------->
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>CM269</display-name>
<filter>
<filter-name>WicketLab1</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>cm269.lab1.MyApp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WicketLab1</filter-name>
<url-pattern>/lab1/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>WicketLab2</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>cm269.lab2.MyApp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WicketLab2</filter-name>
<url-pattern>/lab2/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>WicketLab3</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>cm269.lab3.MyApp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WicketLab3</filter-name>
<url-pattern>/lab3/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>WicketLab4</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>cm269.lab4.MyApp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WicketLab4</filter-name>
<url-pattern>/lab4/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>WicketLab5</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>cm269.lab5.MyApp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WicketLab5</filter-name>
<url-pattern>/lab5/*</url-pattern>
</filter-mapping>
</web-app>
<!------------- web.xml ----------------->
/************** MyApp.java **************/
package cm269.lab5;
import org.apache.wicket.protocol.http.WebApplication;
public class MyApp extends WebApplication {
public Class getHomePage() {
return ListFAQ.class;
}
}
/************** MyApp.java **************/
/************** ListFAQ.java **************/
package cm269.lab5;
import java.util.ArrayList;
import java.util.List;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
public class ListFAQ extends WebPage {
private static List questions;
private static List answers;
public ListFAQ() {
questions = new ArrayList();
questions.add("How to run Eclipse?");
questions.add("How to run NetBeans?");
questions.add("How to run Tomcat?");
answers = new ArrayList();
answers.add("Double click its icon.");
answers.add("Type netbeans at the command line.");
answers.add("Run startup.bat.");
ListView eachQuestion = new ListView("eachQuestion", questions) {
protected void populateItem(ListItem item) {
int idx = item.getIndex();
item.add(new Question("question", (String) questions.get(idx),
(String) answers.get(idx)));
}
};
add(eachQuestion);
}
}
/************** ListFAQ.java **************/
<!------------- ListFAQ.html --------------->
<html>
<body>
<div wicket:id="eachQuestion">
<div wicket:id="question"/>
</div>
</body>
</html>
<!------------- ListFAQ.html --------------->
/************** Question.java **************/
package cm269.lab5;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.AbstractReadOnlyModel;
public class Question extends Panel {
private Label answer;
private Rating r = new Rating();
private Label question;
private ModalWindow modal;
private ModalWindow modifyAnswerModal;
private NewAnswer newAnswer = new NewAnswer();
public Question(String id, final String questionText,
final String answerText) {
super(id);
AjaxLink link = new AjaxLink("link") {
public void onClick(AjaxRequestTarget target) {
answer.setVisible(!answer.isVisible());
target.addComponent(answer);
}
};
add(link);
question = new Label("question", new AbstractReadOnlyModel() {
public Object getObject() {
return questionText + " (" + r.getAverageRating() + ")";
}
});
question.setOutputMarkupId(true);
link.add(question);
answer = new Label("answer", new AbstractReadOnlyModel() {
public Object getObject() {
if(newAnswer.getNewAnswer() == null){
return answerText;
}
return newAnswer.getNewAnswer();
}
});
answer.setVisible(false);
answer.setOutputMarkupPlaceholderTag(true);
add(answer);
AjaxLink rate = new AjaxLink("rate") {
public void onClick(AjaxRequestTarget target) {
modal.show(target);
}
};
add(rate);
modal = new ModalWindow("modal");
modal.setInitialWidth(200);
modal.setInitialHeight(100);
add(modal);
GetRating getRating = new GetRating(modal.getContentId(), r, question, modal);
modal.setContent(getRating);
AjaxLink modifyAnswer = new AjaxLink("modifyAnswer") {
public void onClick(AjaxRequestTarget target) {
modifyAnswerModal.show(target);
}
};
add(modifyAnswer);
modifyAnswerModal = new ModalWindow("modifyAnswerModal");
modifyAnswerModal.setInitialWidth(400);
modifyAnswerModal.setInitialHeight(100);
add(modifyAnswerModal);
GetAnswer getAnswer = new GetAnswer(modifyAnswerModal.getContentId(), newAnswer, answer, modifyAnswerModal);
modifyAnswerModal.setContent(getAnswer);
}
}
}
/************** Question.java **************/
<!------------- Question.html ------------->
<html>
<wicket:panel>
<div>
<a wicket:id="link">
<span wicket:id="question">Q: abc</span>
</a>
<a wicket:id="rate">Rate</a>
<a wicket:id="modifyAnswer">Modify Answer</a>
<div wicket:id="modal"/>
</div>
<div wicket:id="answer">A: xyz</div>
<div wicket:id="modifyAnswerModal"/>
</wicket:panel>
</html>
<!------------- Question.html ------------->
/************** GetRating.java **************/
package cm269.lab5;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.form.AjaxSubmitButton;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.CompoundPropertyModel;
public class GetRating extends Panel {
private int rating = 5;
public GetRating(String id, final Rating r , final Component toBeRegreshed, final ModalWindow modal) {
super(id);
Form f = new Form("f", new CompoundPropertyModel(this));
add(f);
f.add(new TextField("rating", Integer.class));
f.add(new AjaxSubmitButton("rate", f) {
protected void onSubmit(AjaxRequestTarget target, Form form) {
r.add(rating);
target.addComponent(toBeRegreshed);
modal.close(target);
}
});
}
}
/************** GetRating.java **************/
<!------------- GetRating.html ------------->
<html>
<wicket:panel>
<form wicket:id="f" style="float:right">
<input type="text" wicket:id="rating" size="2">
<input type="submit" wicket:id="rate" value="Rate">
</form>
</wicket:panel>
</html>
<!------------- GetRating.html ------------->
/************** GetAnswer.java **************/
package cm269.lab5;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.form.AjaxSubmitButton;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.CompoundPropertyModel;
public class GetAnswer extends Panel {
private String newAnswer;
public GetAnswer(String id, final NewAnswer n, final Component toBeRegreshed, final ModalWindow modal) {
super(id);
Form f = new Form("f", new CompoundPropertyModel(this));
add(f);
f.add(new TextField("newAnswer", String.class));
f.add(new AjaxSubmitButton("modify", f) {
protected void onSubmit(AjaxRequestTarget target, Form form) {
n.setNewAnswer(getNewAnswer());
target.addComponent(toBeRegreshed);
modal.close(target);
}
});
}
public String getNewAnswer() {
return newAnswer;
}
public void setNewAnswer(String newAnswer) {
this.newAnswer = newAnswer;
}
}
/************** GetAnswer.java **************/
<!------------- GetAnswer.html ------------->
<html>
<wicket:panel>
<form wicket:id="f" style="float:left">
<table border="0" align="left">
<tr>
<td align="left">
New Answer:<input type="text" wicket:id="newAnswer" size="30">
</td>
</tr>
<tr>
<td align="left">
<input type="submit" wicket:id="modify" value="Modify">
</td>
</tr>
</table>
</form>
</wicket:panel>
</html>
<!------------- GetAnswer.html ------------->
/************** Rating.java **************/
package cm269.lab5;
import java.io.Serializable;
public class Rating implements Serializable {
private int totalRating = 0;
private int noRatings = 0;
public int getAverageRating() {
return noRatings == 0 ? 0 : totalRating / noRatings;
}
public void add(int rating) {
totalRating += rating;
noRatings++;
}
}
/************** Rating.java **************/
/************** NewAnswer.java **************/
package cm269.lab5;
import java.io.Serializable;
public class NewAnswer implements Serializable{
private String newAnswer;
public String getNewAnswer() {
return newAnswer;
}
public void setNewAnswer(String newAnswer) {
this.newAnswer = newAnswer;
}
}
/************** NewAnswer.java **************/
項目結構如下圖所示：
參考資料：
http://wicket.apache.org/
