[Wicket-user] [Question] render(final MarkupStream markupStream)
I have a question about the render method. Why, before rendering, instead of
checking isVisibleInHierarchy(), isVisible() is called?
public final void render(final MarkupStream markupStream)
{
setMarkupStream(markupStream);
setFlag(FLAG_IS_RENDERED_ONCE, true);
// Determine if component is visible using it's authorization
status
// and the isVisible property.
if (isRenderAllowed() isVisible()) //why not
isVisibleInHierarchy() ??
{
//etc...
}
//more code.
}
I am asking because I suspect a bug with the following StackTrace:
Caused by: java.lang.NullPointerException
at wicket.markup.html.list.ListView.renderItem(ListView.java:676)
at wicket.markup.html.list.ListView.onRender(ListView.java:637)
I happens when an AjaxTabbedPanel is updated via ajax. The tabbedPanel
contains a holder Panel with a ListView child component. The visibility of
the holder Panel is decided dynamicaly by overriding isVisible method.
Maybe later I will try to isolate this situation and to make it more clear.
Still, I would like to know if you've encountered something like this.
Thank you!
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Re: [Wicket-user] [Question] render(final MarkupStream markupStream)
Hmmm,
This bug looks suspiciously like another onAttach/onBeforeRender issue.
Matej seems good at debugging those, care to comment? :-)
Al
Alex Objelean wrote:
I have a question about the render method. Why, before rendering, instead of
checking isVisibleInHierarchy(), isVisible() is called?
public final void render(final MarkupStream markupStream)
{
setMarkupStream(markupStream);
setFlag(FLAG_IS_RENDERED_ONCE, true);
// Determine if component is visible using it's authorization
status
// and the isVisible property.
if (isRenderAllowed() isVisible()) //why not
isVisibleInHierarchy() ??
{
//etc...
}
//more code.
}
I am asking because I suspect a bug with the following StackTrace:
Caused by: java.lang.NullPointerException
at wicket.markup.html.list.ListView.renderItem(ListView.java:676)
at wicket.markup.html.list.ListView.onRender(ListView.java:637)
I happens when an AjaxTabbedPanel is updated via ajax. The tabbedPanel
contains a holder Panel with a ListView child component. The visibility of
the holder Panel is decided dynamicaly by overriding isVisible method.
Maybe later I will try to isolate this situation and to make it more clear.
Still, I would like to know if you've encountered something like this.
Thank you!
--
Alastair Maw
Wicket-biased blog at http://herebebeasties.com
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Re: [Wicket-user] [Question] render(final MarkupStream markupStream)
isVisibleInHierarchy doesn't make to much sense because it has to be
visible already because the parent is already rendering and passing
its render to the childs. So the parent is already checked for
visiblility.
what you seem to have is more another bug that something
is not created or tried to rendered that is already removed by another
request
On 6/13/07, Alex Objelean [EMAIL PROTECTED] wrote:
I have a question about the render method. Why, before rendering, instead of
checking isVisibleInHierarchy(), isVisible() is called?
public final void render(final MarkupStream markupStream)
{
setMarkupStream(markupStream);
setFlag(FLAG_IS_RENDERED_ONCE, true);
// Determine if component is visible using it's authorization
status
// and the isVisible property.
if (isRenderAllowed() isVisible()) //why not
isVisibleInHierarchy() ??
{
//etc...
}
//more code.
}
I am asking because I suspect a bug with the following StackTrace:
Caused by: java.lang.NullPointerException
at wicket.markup.html.list.ListView.renderItem(ListView.java:676)
at wicket.markup.html.list.ListView.onRender(ListView.java:637)
I happens when an AjaxTabbedPanel is updated via ajax. The tabbedPanel
contains a holder Panel with a ListView child component. The visibility of
the holder Panel is decided dynamicaly by overriding isVisible method.
Maybe later I will try to isolate this situation and to make it more clear.
Still, I would like to know if you've encountered something like this.
Thank you!
--
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http://www.nabble.com/-Question--render%28final-MarkupStream-markupStream%29-tf3914413.html#a11098575
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Re: [Wicket-user] [Question] render(final MarkupStream markupStream)
I found a workaround for this issue, so instead of overriding isVisible() of
the bulkContainer WebMarkupContainer, I add an AttributeModifier which makes
the container display:none..
private WebMarkupContainer getBulkContainer() {
if (bulkContainer == null) {
bulkContainer = new WebMarkupContainer(bulkContainer);
bulkContainer.add(new SimpleAttributeModifier(class, invisible) {
public boolean isEnabled() {
return getMode().isEdit();
}
});
//add to bulkContainer a form which contains a ListView.
}
return bulkContainer;
}
I do not like this solution, because anyone having firebug can hack the
application + more markup than needed is generated...
Johan Compagner wrote:
isVisibleInHierarchy doesn't make to much sense because it has to be
visible already because the parent is already rendering and passing
its render to the childs. So the parent is already checked for
visiblility.
what you seem to have is more another bug that something
is not created or tried to rendered that is already removed by another
request
On 6/13/07, Alex Objelean [EMAIL PROTECTED] wrote:
I have a question about the render method. Why, before rendering, instead
of
checking isVisibleInHierarchy(), isVisible() is called?
public final void render(final MarkupStream markupStream)
{
setMarkupStream(markupStream);
setFlag(FLAG_IS_RENDERED_ONCE, true);
// Determine if component is visible using it's authorization
status
// and the isVisible property.
if (isRenderAllowed() isVisible()) //why not
isVisibleInHierarchy()
??
{
//etc...
}
//more code.
}
I am asking because I suspect a bug with the following StackTrace:
Caused by: java.lang.NullPointerException
at wicket.markup.html.list.ListView.renderItem(ListView.java:676)
at wicket.markup.html.list.ListView.onRender(ListView.java:637)
I happens when an AjaxTabbedPanel is updated via ajax. The tabbedPanel
contains a holder Panel with a ListView child component. The visibility
of
the holder Panel is decided dynamicaly by overriding isVisible method.
Maybe later I will try to isolate this situation and to make it more
clear.
Still, I would like to know if you've encountered something like this.
Thank you!
--
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http://www.nabble.com/-Question--render%28final-MarkupStream-markupStream%29-tf3914413.html#a11098575
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Re: [Wicket-user] [Question] render(final MarkupStream markupStream)
we also have a. setting where we do output some markup with
display:none when it is not visible, setOutputMarkupIdX() (i
forgot the exact name)
On 6/13/07, Alex Objelean [EMAIL PROTECTED] wrote:
I found a workaround for this issue, so instead of overriding isVisible() of
the bulkContainer WebMarkupContainer, I add an AttributeModifier which makes
the container display:none..
private WebMarkupContainer getBulkContainer() {
if (bulkContainer == null) {
bulkContainer = new WebMarkupContainer(bulkContainer);
bulkContainer.add(new SimpleAttributeModifier(class, invisible) {
public boolean isEnabled() {
return getMode().isEdit();
}
});
//add to bulkContainer a form which contains a ListView.
}
return bulkContainer;
}
I do not like this solution, because anyone having firebug can hack the
application + more markup than needed is generated...
Johan Compagner wrote:
isVisibleInHierarchy doesn't make to much sense because it has to be
visible already because the parent is already rendering and passing
its render to the childs. So the parent is already checked for
visiblility.
what you seem to have is more another bug that something
is not created or tried to rendered that is already removed by another
request
On 6/13/07, Alex Objelean [EMAIL PROTECTED] wrote:
I have a question about the render method. Why, before rendering, instead
of
checking isVisibleInHierarchy(), isVisible() is called?
public final void render(final MarkupStream markupStream)
{
setMarkupStream(markupStream);
setFlag(FLAG_IS_RENDERED_ONCE, true);
// Determine if component is visible using it's authorization
status
// and the isVisible property.
if (isRenderAllowed() isVisible()) //why not
isVisibleInHierarchy()
??
{
//etc...
}
//more code.
}
I am asking because I suspect a bug with the following StackTrace:
Caused by: java.lang.NullPointerException
at wicket.markup.html.list.ListView.renderItem(ListView.java:676)
at wicket.markup.html.list.ListView.onRender(ListView.java:637)
I happens when an AjaxTabbedPanel is updated via ajax. The tabbedPanel
contains a holder Panel with a ListView child component. The visibility
of
the holder Panel is decided dynamicaly by overriding isVisible method.
Maybe later I will try to isolate this situation and to make it more
clear.
Still, I would like to know if you've encountered something like this.
Thank you!
--
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http://www.nabble.com/-Question--render%28final-MarkupStream-markupStream%29-tf3914413.html#a11098575
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Re: [Wicket-user] [Question] render(final MarkupStream markupStream)
On Wed, 13 Jun 2007, Alex Objelean wrote: I found a workaround for this issue, so instead of overriding isVisible() of the bulkContainer WebMarkupContainer, I add an AttributeModifier which makes the container display:none.. I'm not sure if I got it correctly, but you're not trying to repaint an invisible container via ajax, right? To make that work you need to update the parent of the conditionally- visible component. Another thing that we have noticed is that sometimes calling setVisible() in onBeforeRender() works better than overriding isVisble() directly. Make sure you call super.onBeforeRender() in the overriding implementation. - Timo -- Timo Rantalaiho Reaktor Innovations OyURL: http://www.ri.fi/ - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
