I have a problem with using forms in components where the data model
is passed to the components via parameter inside a T5 loop component.
When a form is submitted the data model seems to be lost.
What I'm trying to do is to iterate through a collection of users and
construct a form for each user where a user name can be edited. Each
form resides in a component that handles submission. The user model
data is passed to the component inside a page where a loop loops
through a collection of users. The idea is to have a form for each
user so when submitting a form, only the user edited will get updated.
However, when a form is submitted the user data model is lost and ends
up as a null pointer.
I wouldn't be surprised if I've missed something obvious or if the way
I try to achieve a form for each user isn't a valid usage of T5. Any
thoughts or suggestions? I've attached a simple example demonstrating
my approach in this email.
/Olof
// User.java Data Model
package org.example;
public class User
{
private String name;
public User(String name)
{
this.name = name;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
}
//Users.java T5 Page
package org.example.testapp.pages;
import java.util.ArrayList;
import java.util.List;
import org.apache.tapestry.annotations.Persist;
import org.example.User;
public class Users
{
private User user;
@Persist("flash")
private List<User> users;
public void onActivate()
{
if (users == null)
{
users = new ArrayList<User>();
users.add(new User("Ted"));
users.add(new User("Olof"));
}
}
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
public List<User> getUsers()
{
return users;
}
}
// Users.html T5 Template
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
<head>
</head>
<body>
<t:loop source="users" value="user">
<t:edituser user="user"/>
</t:loop>
</body>
</html>
//EditUser.java T5 Component
package org.example.testapp.components;
import org.apache.tapestry.annotations.Parameter;
import org.example.User;
public class EditUser
{
@Parameter(required = true)
private User user;
public void setUser(User user)
{
this.user = user;
}
public User getUser()
{
return user;
}
public void onSuccess()
{
// save user
}
}
//EditUser.html T5 Template
<t:form xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
<t:textfield value="user.name"/><br/>
<t:submit t:id="save" value="save"/>
</t:form>
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