RE: getter called multiple times on PropertyModel with ListView
Thanks. It does work, and the load() method only gets called once when the view
renders. However, I am still confused as to why it works. In other words, why
LoadableDetachableModel only gets called once, whereas PropertyModel gets
called multiple times on rendering the ListView. For instance, the JavaDocs for
this class say: LoadableDetachableModel holds a temporary, transient model
object. If anything, it seems like that would get called MORE than
PropertyModel, not less, in case the temporary, transient model object gets
changed. Just struggling to really understand how models work, because they
seem so key to understanding Wicket.
Thanks
-Original Message-
From: Hoover, William [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 3:09 PM
To: users@wicket.apache.org
Subject: RE: getter called multiple times on PropertyModel with ListView
// It solves your problem because the call to load will be made each
time your view renders
final LoadableDetachableModel articlesLoadableModel = new
LoadableDetachableModel() {
private static final long serialVersionUID = 1L;
/**
* [EMAIL PROTECTED]
*/
@Override
protected final Object load() {
return new PropertyModel(YourPage.this, articles);
}
};
final ListView newsDetails = new ListView(newsDetails,
articlesLoadableModel){
private static final long serialVersionUID = 1L;
/**
* [EMAIL PROTECTED]
*/
@Override
protected final void populateItem(final ListItem item) {
...
}
};
add(newsDetails);
-Original Message-
From: Andrew Broderick [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 2:19 PM
To: 'users@wicket.apache.org'
Subject: RE: getter called multiple times on PropertyModel with ListView
Cannot instantiate LoadableDetachableModel directly .. it is abstract.
Besides, how does it help solve the problem?
Thanks
-Original Message-
From: Igor Vaynberg [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 12:49 PM
To: users@wicket.apache.org
Subject: Re: getter called multiple times on PropertyModel with ListView
ListView newsDetails = new ListView(newsDetails, new
LoadableDetachableModel(new PropertyModel(this, articles)))
-igor
On Tue, Apr 29, 2008 at 10:46 AM, Andrew Broderick
[EMAIL PROTECTED] wrote:
Hi,
I have a page where I am using a PropertyModel to populate a
ListView, so it will change when the underlying contents change:
ListView newsDetails = new ListView(newsDetails, new
PropertyModel(this, articles))
{
protected void populateItem(ListItem item)
{
final NewsDetails nd = (NewsDetails)
item.getModelObject();
item.add(new Label(articleDate,
nd.getArticleDate()));
item.add(new Label(articleTime,
nd.getArticleTime()));
item.add(new Label(newsShortDesc,
nd.getNewsShortDesc()));
newsUrlLink.add(new Label(newsTitle,
nd.getNewsTitle()));
item.add(newsUrlLink);
}
};
add(newsDetails);
The page class, obviously, has a getter named getArticles():
public ListNewsDetails getArticles()
{
}
However, this seems to get called multiple times when the listview is
being populated, not just once at the beginning of each time the page is
displayer. Why is this happening? It results in many more hits to the
database than are necessary.
Thanks,
Andrew B
___
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Re: getter called multiple times on PropertyModel with ListView
Read the models document on the wiki. It has helped many others.
/shameless plug: chapter 4 of WIA also explains detachable models in detail.
Martijn
On 4/30/08, Andrew Broderick [EMAIL PROTECTED] wrote:
Thanks. It does work, and the load() method only gets called once when the
view renders. However, I am still confused as to why it works. In other
words, why LoadableDetachableModel only gets called once, whereas
PropertyModel gets called multiple times on rendering the ListView. For
instance, the JavaDocs for this class say: LoadableDetachableModel holds a
temporary, transient model object. If anything, it seems like that would get
called MORE than PropertyModel, not less, in case the temporary, transient
model object gets changed. Just struggling to really understand how models
work, because they seem so key to understanding Wicket.
Thanks
-Original Message-
From: Hoover, William [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 3:09 PM
To: users@wicket.apache.org
Subject: RE: getter called multiple times on PropertyModel with ListView
// It solves your problem because the call to load will be made each
time your view renders
final LoadableDetachableModel articlesLoadableModel = new
LoadableDetachableModel() {
private static final long serialVersionUID = 1L;
/**
* [EMAIL PROTECTED]
*/
@Override
protected final Object load() {
return new PropertyModel(YourPage.this, articles);
}
};
final ListView newsDetails = new ListView(newsDetails,
articlesLoadableModel){
private static final long serialVersionUID = 1L;
/**
* [EMAIL PROTECTED]
*/
@Override
protected final void populateItem(final ListItem item) {
...
}
};
add(newsDetails);
-Original Message-
From: Andrew Broderick [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 2:19 PM
To: 'users@wicket.apache.org'
Subject: RE: getter called multiple times on PropertyModel with ListView
Cannot instantiate LoadableDetachableModel directly .. it is abstract.
Besides, how does it help solve the problem?
Thanks
-Original Message-
From: Igor Vaynberg [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 12:49 PM
To: users@wicket.apache.org
Subject: Re: getter called multiple times on PropertyModel with ListView
ListView newsDetails = new ListView(newsDetails, new
LoadableDetachableModel(new PropertyModel(this, articles)))
-igor
On Tue, Apr 29, 2008 at 10:46 AM, Andrew Broderick
[EMAIL PROTECTED] wrote:
Hi,
I have a page where I am using a PropertyModel to populate a
ListView, so it will change when the underlying contents change:
ListView newsDetails = new ListView(newsDetails, new
PropertyModel(this, articles))
{
protected void populateItem(ListItem item)
{
final NewsDetails nd = (NewsDetails)
item.getModelObject();
item.add(new Label(articleDate,
nd.getArticleDate()));
item.add(new Label(articleTime,
nd.getArticleTime()));
item.add(new Label(newsShortDesc,
nd.getNewsShortDesc()));
newsUrlLink.add(new Label(newsTitle,
nd.getNewsTitle()));
item.add(newsUrlLink);
}
};
add(newsDetails);
The page class, obviously, has a getter named getArticles():
public ListNewsDetails getArticles()
{
}
However, this seems to get called multiple times when the listview is
being populated, not just once at the beginning of each time the page is
displayer. Why is this happening? It results in many more hits to the
database than are necessary.
Thanks,
Andrew B
___
The information in this email or in any file attached hereto is
intended only for the personal and confiden- tial use of the
individual or entity to which it is addressed and may contain
information that is propri- etary and confidential. If you are
not the intended recipient of this message you are hereby notified
that any review, dissemination, distribution or copying of this
message is strictly prohibited. This communica- tion is for
information purposes only and should not be regarded as an offer to
sell or as a solicitation of an offer to buy any financial product.
Email trans- mission cannot be guaranteed to be secure or error-
free. P6070214
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED
Re: getter called multiple times on PropertyModel with ListView
ListView newsDetails = new ListView(newsDetails, new
LoadableDetachableModel(new PropertyModel(this, articles)))
-igor
On Tue, Apr 29, 2008 at 10:46 AM, Andrew Broderick
[EMAIL PROTECTED] wrote:
Hi,
I have a page where I am using a PropertyModel to populate a ListView, so it
will change when the underlying contents change:
ListView newsDetails = new ListView(newsDetails, new
PropertyModel(this, articles))
{
protected void populateItem(ListItem item)
{
final NewsDetails nd = (NewsDetails)
item.getModelObject();
item.add(new Label(articleDate,
nd.getArticleDate()));
item.add(new Label(articleTime,
nd.getArticleTime()));
item.add(new Label(newsShortDesc,
nd.getNewsShortDesc()));
newsUrlLink.add(new Label(newsTitle,
nd.getNewsTitle()));
item.add(newsUrlLink);
}
};
add(newsDetails);
The page class, obviously, has a getter named getArticles():
public ListNewsDetails getArticles()
{
}
However, this seems to get called multiple times when the listview is being
populated, not just once at the beginning of each time the page is displayer.
Why is this happening? It results in many more hits to the database than are
necessary.
Thanks,
Andrew B
___
The information in this email or in any file attached
hereto is intended only for the personal and confiden-
tial use of the individual or entity to which it is
addressed and may contain information that is propri-
etary and confidential. If you are not the intended
recipient of this message you are hereby notified that
any review, dissemination, distribution or copying of
this message is strictly prohibited. This communica-
tion is for information purposes only and should not
be regarded as an offer to sell or as a solicitation
of an offer to buy any financial product. Email trans-
mission cannot be guaranteed to be secure or error-
free. P6070214
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: getter called multiple times on PropertyModel with ListView
Cannot instantiate LoadableDetachableModel directly .. it is abstract. Besides,
how does it help solve the problem?
Thanks
-Original Message-
From: Igor Vaynberg [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 12:49 PM
To: users@wicket.apache.org
Subject: Re: getter called multiple times on PropertyModel with ListView
ListView newsDetails = new ListView(newsDetails, new
LoadableDetachableModel(new PropertyModel(this, articles)))
-igor
On Tue, Apr 29, 2008 at 10:46 AM, Andrew Broderick
[EMAIL PROTECTED] wrote:
Hi,
I have a page where I am using a PropertyModel to populate a ListView, so it
will change when the underlying contents change:
ListView newsDetails = new ListView(newsDetails, new
PropertyModel(this, articles))
{
protected void populateItem(ListItem item)
{
final NewsDetails nd = (NewsDetails)
item.getModelObject();
item.add(new Label(articleDate,
nd.getArticleDate()));
item.add(new Label(articleTime,
nd.getArticleTime()));
item.add(new Label(newsShortDesc,
nd.getNewsShortDesc()));
newsUrlLink.add(new Label(newsTitle,
nd.getNewsTitle()));
item.add(newsUrlLink);
}
};
add(newsDetails);
The page class, obviously, has a getter named getArticles():
public ListNewsDetails getArticles()
{
}
However, this seems to get called multiple times when the listview is being
populated, not just once at the beginning of each time the page is displayer.
Why is this happening? It results in many more hits to the database than are
necessary.
Thanks,
Andrew B
___
The information in this email or in any file attached
hereto is intended only for the personal and confiden-
tial use of the individual or entity to which it is
addressed and may contain information that is propri-
etary and confidential. If you are not the intended
recipient of this message you are hereby notified that
any review, dissemination, distribution or copying of
this message is strictly prohibited. This communica-
tion is for information purposes only and should not
be regarded as an offer to sell or as a solicitation
of an offer to buy any financial product. Email trans-
mission cannot be guaranteed to be secure or error-
free. P6070214
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: getter called multiple times on PropertyModel with ListView
// It solves your problem because the call to load will be made each
time your view renders
final LoadableDetachableModel articlesLoadableModel = new
LoadableDetachableModel() {
private static final long serialVersionUID = 1L;
/**
* [EMAIL PROTECTED]
*/
@Override
protected final Object load() {
return new PropertyModel(YourPage.this, articles);
}
};
final ListView newsDetails = new ListView(newsDetails,
articlesLoadableModel){
private static final long serialVersionUID = 1L;
/**
* [EMAIL PROTECTED]
*/
@Override
protected final void populateItem(final ListItem item) {
...
}
};
add(newsDetails);
-Original Message-
From: Andrew Broderick [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 2:19 PM
To: 'users@wicket.apache.org'
Subject: RE: getter called multiple times on PropertyModel with ListView
Cannot instantiate LoadableDetachableModel directly .. it is abstract.
Besides, how does it help solve the problem?
Thanks
-Original Message-
From: Igor Vaynberg [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 12:49 PM
To: users@wicket.apache.org
Subject: Re: getter called multiple times on PropertyModel with ListView
ListView newsDetails = new ListView(newsDetails, new
LoadableDetachableModel(new PropertyModel(this, articles)))
-igor
On Tue, Apr 29, 2008 at 10:46 AM, Andrew Broderick
[EMAIL PROTECTED] wrote:
Hi,
I have a page where I am using a PropertyModel to populate a
ListView, so it will change when the underlying contents change:
ListView newsDetails = new ListView(newsDetails, new
PropertyModel(this, articles))
{
protected void populateItem(ListItem item)
{
final NewsDetails nd = (NewsDetails)
item.getModelObject();
item.add(new Label(articleDate,
nd.getArticleDate()));
item.add(new Label(articleTime,
nd.getArticleTime()));
item.add(new Label(newsShortDesc,
nd.getNewsShortDesc()));
newsUrlLink.add(new Label(newsTitle,
nd.getNewsTitle()));
item.add(newsUrlLink);
}
};
add(newsDetails);
The page class, obviously, has a getter named getArticles():
public ListNewsDetails getArticles()
{
}
However, this seems to get called multiple times when the listview is
being populated, not just once at the beginning of each time the page is
displayer. Why is this happening? It results in many more hits to the
database than are necessary.
Thanks,
Andrew B
___
The information in this email or in any file attached hereto is
intended only for the personal and confiden- tial use of the
individual or entity to which it is addressed and may contain
information that is propri- etary and confidential. If you are
not the intended recipient of this message you are hereby notified
that any review, dissemination, distribution or copying of this
message is strictly prohibited. This communica- tion is for
information purposes only and should not be regarded as an offer to
sell or as a solicitation of an offer to buy any financial product.
Email trans- mission cannot be guaranteed to be secure or error-
free. P6070214
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
