Thanks, Matt, for your response.
On 16.12.2007, at 02:13, Matt Brock wrote:
The problem is that I don't think your even/odd requirement will
work with
any of the regular Tapestry components. Normally you iterate over a
collection of values (the @For component, for example), and use an
OGNL
expression like class="ognl:(index % 2 == 0 ? 'even' : 'odd')" to
determine
whether the row is odd or even. But the problem is, not all of
your rows
are going to be rendered. So what happens when the first row's @If
condition evaluates true, the second row's condition evaluates
false, then
the third evaluates true? You'll end up with two rows both marked
"even".
That's exactly what was happening in my case!
The easiest way to do this would be to write your own renderComponent
method. That way you get complete control over the output. This
has the
added advantage of bypassing the OGNL parser. You don't need a
component
definition file (.jwc) or an HTML file, either. Just a single java
class.
Something like this:
MyComponent.java
public abstract class MyComponent extends AbstractComponent {
@Parameter
public abstract MyObject getMyObject();
protected void renderComponent(IMarkupWriter writer,
IRequestCycle cycle) {
// You can also use the writer.begin/writer.attribute way of doing
things,
but this is faster.
StringBuffer output = new StringBuffer();
output.append("<table>");
int i = 0;
if (getMyObject().getTitle() != null) {
output.append("<tr").append
(i % 2 ==
0 ? " class=\"even\"" :
"").append("><td>").append(getMyObject().getTitle()).append
("</td></tr>");
i++;
}
if (getMyObject().getNextProperty() != null) {
output.append("<tr").append
(i % 2 ==
0 ? " class=\"even\"" :
"").append("><td>").append(getMyObject().getNextProperty
()).append("</td></tr>");
i++;
}
...etc...
output.append("
");
writer.print(output,true);
}
}
I get it. -- I finally took Kristian's suggestion as it allowed me
to keep my markup in a HTML-file (even though I don't know whether
the latter is worth it).
Thanks!
Kaspar
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