Re: [T5] Problem with multiple forms in a loop
I didn't see Olof's original post, but this is what the PREPARE event is for.
Use it to set up the object that is being edited using the form context.
Also, note that there is a limitation with form validation. From the docs:
- tracker
- org.apache.tapestry.ValidationTracker
- defaultTracker
- prop
- The object which will record user input and validation errors. The object
must be persistent between requests (since the form submission and validation
occurs in an component event request and the subsequent render occurs in a
render request). The default is a persistent property of the Form component
and this is sufficient for nearly all purposes
__ (except when a Form is rendered inside a loop). __
Cheers,
Nick.
Angelo Chen wrote:
Hi,
oic, maybe an ajax will do? I am thinking of providing a hidden form, when
user click a link in one record, it will insert the hidden form below the
selected row for user to edit, then submit it via an ajax call and close the
form, not yet tried.
A.C.
quot;Olof =?UTF-8?Q?N=C3=A6ss=C3=A9nquot; ?= wrote:
I'm afraid not. I ended up with enclosing all users in one big form. I
thought it wasn't worth solving when the one form approach worked just
fine in my case.
/Olof
On 29/10/2007, Angelo Chen [EMAIL PROTECTED] wrote:
Hi Olof,
Did you find a solution to this? I have similar need as yours this time.
A.C.
Olof =?UTF-8?Q?N=C3=A6ss=C3=A9n ?= wrote:
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 ListUser users;
public void onActivate()
{
if (users == null)
{
users = new ArrayListUser();
users.add(new User(Ted));
users.add(new User(Olof));
}
}
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
public ListUser 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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Re: [T5] Problem with multiple forms in a loop
Hi Olof,
Did you find a solution to this? I have similar need as yours this time.
A.C.
quot;Olof =?UTF-8?Q?N=C3=A6ss=C3=A9nquot; ?= wrote:
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 ListUser users;
public void onActivate()
{
if (users == null)
{
users = new ArrayListUser();
users.add(new User(Ted));
users.add(new User(Olof));
}
}
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
public ListUser 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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Re: [T5] Problem with multiple forms in a loop
I'm afraid not. I ended up with enclosing all users in one big form. I
thought it wasn't worth solving when the one form approach worked just
fine in my case.
/Olof
On 29/10/2007, Angelo Chen [EMAIL PROTECTED] wrote:
Hi Olof,
Did you find a solution to this? I have similar need as yours this time.
A.C.
Olof =?UTF-8?Q?N=C3=A6ss=C3=A9n ?= wrote:
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 ListUser users;
public void onActivate()
{
if (users == null)
{
users = new ArrayListUser();
users.add(new User(Ted));
users.add(new User(Olof));
}
}
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
public ListUser 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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Re: [T5] Problem with multiple forms in a loop
Hi,
oic, maybe an ajax will do? I am thinking of providing a hidden form, when
user click a link in one record, it will insert the hidden form below the
selected row for user to edit, then submit it via an ajax call and close the
form, not yet tried.
A.C.
quot;Olof =?UTF-8?Q?N=C3=A6ss=C3=A9nquot; ?= wrote:
I'm afraid not. I ended up with enclosing all users in one big form. I
thought it wasn't worth solving when the one form approach worked just
fine in my case.
/Olof
On 29/10/2007, Angelo Chen [EMAIL PROTECTED] wrote:
Hi Olof,
Did you find a solution to this? I have similar need as yours this time.
A.C.
Olof =?UTF-8?Q?N=C3=A6ss=C3=A9n ?= wrote:
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 ListUser users;
public void onActivate()
{
if (users == null)
{
users = new ArrayListUser();
users.add(new User(Ted));
users.add(new User(Olof));
}
}
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
public ListUser 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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Re: [T5] Problem with multiple forms in a loop
This gets to be tricky stuff.
Remember that a form submissions starts with the page instance, with its
persisted fields rolled back to their latest values. Anything that isn't
@Persist will be in a null or default state.
What's going on here is that your form is dependent on same transitory
state; that is, state that exists ephemerally during the rendering process.
That isn't a problem, except that the data you need is no longer available
when the form is submitted.
You could try to handle this much like an ActionLink, using the context
parameter of the form. That context is provided to the prepare event (i.e.,
the onPrepare() method). The prepare event is fired as part of the initial
render, and at the start of the form submission. In your case, the logical
context value would be the user name, or some form of user id.
In this way, you take direct control of the state information encoded into
your form, and provided back when the form is submitted.
On 9/28/07, Olof Næssén [EMAIL PROTECTED] wrote:
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 ListUser users;
public void onActivate()
{
if (users == null)
{
users = new ArrayListUser();
users.add(new User(Ted));
users.add(new User(Olof));
}
}
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
public ListUser 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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Howard M. Lewis Ship
Partner and Senior Architect at Feature50
Creator Apache Tapestry and Apache HiveMind
