I am doing things here in a way that is backward conceptually to
tapestry. I only have one page in my app and the navigation is based on
state and not page location. This is because the app navigation and
structure is largely dynamic. It would seem like it shouldn't be too
complicated to create a Component to do this. It would be like the
WOSwitchComponent in WebObjects, but then again, I am just learning
tapestry and don't know the request-response cycle here.
One reason that the approach mentioned won't work, is that I don't want
to have to know the component ahead of time, otherwise adding a new
option to the list will become a headache. This list is currently around
10 and it will continue to grow. Any pointers to help me make this
component would be great, but if not, I'll figure something out somehow.
Thanks!
Steve
Robert Zeigler wrote:
As Ben Dotte pointed out already, the "tapestry" way of doing this is to
use block/render block. The nice thing about this approach is that the
blocks you define don't even have to be on the same page as the render
block (although if you start defining blocks on other pages, avoid using
page render listeners to initialize variables for those blocks).
You can even pass parameters on; you can put the parameters into the
render block as informal parameters, and get at them via the "inserter"
property of the block.
So..
in the .html:
<span jwcid="area"/>
In the .jwc:
<component id="area" type="RenderBlock">
<binding name="block" expression="theBlock"/>
<binding name="foo" expression="bar"/>
</component>
.java:
public Block getTheBlock() {
return getRequestCycle()
.getPage("blockpagex").getComponent("blockx");
}
Then, on blockpagex, you might have:
<div jwcid="[EMAIL PROTECTED]">
<!-- render some stuff -->
<!-- note that the expression path I've got here is off the top of
my head, and you'd want to double check it for accuracy. :) -->
<span jwcid="@Insert" value="ognl:components.blockx.inserter.foo"/>
</div>
Robert
Stephen Todd wrote:
I'm trying to specify which component to use dynamically, but I think
what I want to do is outside of conventions. I wanted to do something
like the following.
in the .html
<span jwcid="area"/>
in the .jwc
<component id="area" type="ognl:componentType"/>
and in the .java
public String getComponentType() {
// some code
return "@" + componentType; // ie. MyCoolArea
}
(This isn't the real code)
I know I could just line up a bunch of if's but that seems wrong and
inefficient. I know in the example above that it is trying to find
'componentType' in the namespace 'ognl', but I really just want to pass
a string to specifiy the component.
Thanks,
Steve
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