Hello all, and thank you in advance.
I'm relatively new to struts 2, as I started working with the
framework about 6 months ago on a part time basis. I'm struggling to
solve a problem that I would think would be fairly common: displaying
a tree within a JSP.
Essentially, I have an object (let's call it "Item") that looks
something like the following:
class Item {
private String name;
private Set<Item> children;
// getters and setters
}
Working within a JSP page, I want to display the data within this Item
as follows:
<ul>
<li>
<s:property value="item.name"/>
<s:iterator value="item.children" var="child">
<ul>
<li>
<s:property value="child.name"/>
<s:iterator value="child.children" var="grandchild">
<ul>
<li>
<s:property value="grandchild.name"/>
<s:iterator value="grandchild.child" var "greatgrandchild">
... and so on
</s:iterator>
</li>
</ul>
</s:iterator>
</li>
</ul>
</s:iterator>
</li>
</ul>
Ideally, I would be able to display this data using some sort of
recursion, since there's really no way to tell how deep this tree is.
If anyone knows of a good solution to this problem, I'd be very
interested in hearing it.
I did come up with what I thought might be a solution using the
<s:include> tag. I came up with the following:
In the main jsp page, I have:
<ul>
<li>
<s:include value="inc/displayItem.jsp">
<s:param name="item" value="item"/>
</s:include>
</li>
</ul>
In the included jsp page, I have:
<s:property value="item.name"/>
<s:iterator value="item.children" var="child">
<ul>
<li>
<s:include value="inc/displayItem.jsp">
<s:param name="item" value="child"/>
</s:include>
</li>
</ul>
</s:iterator>
This does not work, of course, because a parameter from within an
included jsp page can only be referenced like this: {$param.item}. In
addition, I can't use that method to access the included parameter
within any struts 2 tags (as far as I can tell).
So again, I suppose my question is: is this an appropriate way of
solving this problem? If so, how can I get this all to work? If not,
what's a better way of going about this?
Thanks again for all of your help,
Anthony Frasso
a...@cornell.edu
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