On Jun 8, 2006, at 9:05 AM, Susan G. Conger wrote:
First, my header.jsp has a section where the graphic changes depend
on what page is begin displayed. I can't seem to figure out the
correct way
to implement this.
The short answer is to use Tile attributes. The longer answer is
that attributes don't always work the way you might think. One of
the weaknesses of Tiles is that there's no good way to pass data from
one tile to another. Attributes are better suited for static
parameter substitution.
For example suppose you have Tile A that defines some attributes and
Tile B that extends Tile A and overrides some attributes as follows:
<definition name="tileA" path="/layout.jsp">
<put name="headerGraphic" value="image1.gif"/>
<put name="someOtherThing" value="..."/>
</definitioin>
<definition name="tileB" extends="tileA">
<put name="headerGraphic" value="image2.gif"/>
</definition>
As long as your layout is completely defined in one JSP page this
will all work. It breaks down if your layout has separate pages for
header, footer, etc. See below:
<definition name="tileA" path="/layout.jsp">
<put name="header" value="/header1.jsp"/>
<put name="headerGraphic" value="image1.gif"/>
<put name="someOtherThing" value="..."/>
</definitioin>
<definition name="tileB" extends="tileA">
<put name="header" value="header2.jsp"/>
<put name="headerGraphic" value="image2.gif"/>
</definition>
Above you want to define your header differently for two layouts and
you want to pass different images in. This won't work because the
headerGraphic attribute will not be passed along to the header page
unless you do it manually from the page where it is inserted.
There's a couple ways to hack this. One is described in another thread:
http://mail-archives.apache.org/mod_mbox/struts-user/200605.mbox/%
[EMAIL PROTECTED]
The other would be, as you indicated in the subject, to embed a tile
within a tile:
<definition name="tileA" path="/layout.jsp">
<put name="header" value="headerTile1"/>
<put name="someOtherThing" value="..."/>
</definitioin>
<definition name="tileB" extends="tileA">
<put name="header" value="headerTile2"/>
</definitioin>
<definitiion name="headerTile1" path="/header.jsp">
<put name="headerGraphic" value="image1.jpg"/>
</definition>
<definitiion name="headerTile2" path="/header.jsp">
<put name="headerGraphic" value="image2.jpg"/>
</definition>
I haven't tried this, but I don't think it works out of the box. In
layout.jsp when you insert the header tile, you'll have to do some
magic I think to resolve the name to a tile definition. This should
be better supported and hopefully will eventually.
Also do I need an html/jsp page to display this image
change or can I just point to the gif file?
If I understand you correctly I think you should be able to just
point to the image file.
HTH,
Greg
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