Border component's <wicket:body /> tag cannot be used within a repeater such as
a ListView
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Key: WICKET-2493
URL: https://issues.apache.org/jira/browse/WICKET-2493
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.4.1
Reporter: Shu Gao
Hi,
I've been using Wicket for about a month now, I've been "practicing" with every
aspects of it, and it just feels right and great for my needs.
But right now, I'm running into a problem using Borders, I've consulted online
help and other related topics, and I've done some working examples
of using Borders as well. the <wicket:body /> tag works well if it's directly
placed under <wicket:border> just as the examples show, or it still works when
it is placed under some other simple container, like a link, or a
WebMarkupContainer, but it won't work if it's placed under a repeater.
I have a border component declared as the following:
MyBorder.html
<wicket:border>
<table>
<tr wicket:id="rows">
<wicket:body />
</tr>
</table>
</wicket:border>
I would like my border component function as a repeating view that outputs
table-like data, but having the outter page who uses this border to define the
specific contents that will be rendered as each row of the table, something
like:
MyPage.html
<div wicket:id="myBorder">
<span wicket:id="myField1" />
<hr />
<span wicket:id="myField2" />
</div>
Then in my code:
MyPage.java
...
MyBorder myBorder = new MyBorder("myBorder");
add(myBorder);
myBorder.add( new Label("myField1", model1) );
myBorder.add( new Label("myField2", model2) );
...
MyBorder.java
...
ListView lv = new ListView("rows", list)
{
public void populateItem(ListItem item)
{
}
}
...
Doing this would result in an exception complaining that
Unable to find component with id 'myField1' in [MarkupContainer [Component id =
_body]]
I understand that because "myField1" has to be added to the border; however,
where do I add it? From the Border API, it stated that if the "body" is not an
immediate child of border (example see below), than you must use code like the
following someContainer.add(getBodyContainer()) to add the body component to
the correct container.
So I'm adding "myField1" in my code, like
lv.add(myField1);
Then I get the following exception:
"The component [Component id = myField1] has the same wicket:id as another
component already added at the same level"
I also understand that I shouldn't be adding components to repeatings directly;
instead I should be adding it to the ListItem upon each iteration, so I did
something like:
public void populateItem(ListItem item)
{
item.add( getBodyContainer() );
}
The way I understand the above code is that the "getBodyContainer()" method
returns what has been specified as the body of the border component; which is
"myField1" and "myField2" in this case.
As for the models of the two labels, I'll use some callback to make sure each
iteration returns the correct model or values for the label to display.
It is supposed to work, at least I thought so, but Wicket then complains that
WicketMessage: Markup element at index 5 failed to advance the markup stream
at
org.apache.wicket.markup.MarkupStream.throwMarkupException(MarkupStream.java:465)
at
org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1604)
at
org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1525)
at org.apache.wicket.Component.renderComponent(Component.java:2626)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1536)
at org.apache.wicket.Component.render(Component.java:2457)
at
org.apache.wicket.markup.html.list.ListView.renderItem(ListView.java:638)
at
org.apache.wicket.markup.html.list.ListView.renderChild(ListView.java:626)
at
org.apache.wicket.markup.repeater.AbstractRepeater.onRender(AbstractRepeater.java:103)
at org.apache.wicket.Component.render(Component.java:2457)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1414)
at
org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1601)
at
org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:675)
at
org.apache.wicket.markup.html.border.Border.onComponentTagBody(Border.java:305)
...
Then I looked at
MarkupContainer.renderComponentTagBody(MarkupContainer.java:1604)
and noticed that Wicket is trying to compare some kind of index...
I am really confused at this, why the markup stream had not been advanced, I'm
simply adding some component to the ListItem upon each iteration, did I do
anything wrong? What should I do if I wanted to achive the above design using
Borders? or should I use something else?
Looking forward to an answer,
thanks in advance!
really appreciated!!
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