Jsf-attribute-tag
提供:Dev Guides
JSF-f:attribute
h:attributeタグは、コンポーネントに属性値を渡すオプション、またはアクションリスナーを介してコンポーネントにパラメーターを渡すオプションを提供します。
JSFタグ
<h:commandButton id = "submit"
actionListener = "#{userData.attributeListener}" action = "result">
<f:attribute name = "value" value = "Show Message"/>
<f:attribute name = "username" value = "JSF 2.0 User"/>
</h:commandButton>
タグ属性
S.No | Attribute & Description |
---|---|
1 |
name 設定する属性の名前 |
2 |
value 属性の値 |
応用例
上記のタグをテストするテストJSFアプリケーションを作成しましょう。
Step | Description |
---|---|
1 | Create a project with a name helloworld under a package com.finddevguides.test as explained in the JSF - First Application chapter. |
2 | Modify home.xhtml as explained below. Keep rest of the files unchanged. |
3 | Create result.xhtml in the webapps directory as explained below. |
4 | Create UserData.java as a managed bean under package com.finddevguides.test as explained below. |
5 | Compile and run the application to make sure business logic is working as per the requirements. |
6 | Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver. |
7 | Launch your web application using appropriate URL as explained below in the last step. |
UserData.java
package com.finddevguides.test;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class UserData implements Serializable {
private static final long serialVersionUID = 1L;
public String data = "1";
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public void attributeListener(ActionEvent event) {
data = (String)event.getComponent().getAttributes().get("username");
}
}
home.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title>JSF Tutorial!</title>
</head>
<body>
<h2>f:attribute example</h2>
<hr/>
<h:form>
<h:commandButton id = "submit"
actionListener = "#{userData.attributeListener}" action = "result">
<f:attribute name = "value" value = "Show Message"/>
<f:attribute name = "username" value = "JSF 2.0 User"/>
</h:commandButton>
</h:form>
</body>
</html>
result.xhtml
<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml"
xmlns:f = "http://java.sun.com/jsf/core"
xmlns:h = "http://java.sun.com/jsf/html"
xmlns:ui = "http://java.sun.com/jsf/facelets">
<head>
<title>JSF Tutorial!</title>
</head>
<h:body>
<h2>Result</h2>
<hr/>
#{userData.data}
</h:body>
</html>
すべての変更を完了したら、JSF-最初のアプリケーションの章で行ったようにアプリケーションをコンパイルして実行します。 すべてがアプリケーションで問題ない場合、次の結果が生成されます。
[メッセージを表示]ボタンを押すと、次の結果が表示されます。