Custom taglibs and XScript

Question

Hi guys,
To simplify my jsp's in a portal 8.1 application I am considering
implementing some custom tags for often used constructs.
In this task I would like to pass some objects to the task-handler
and wonder if I can utilize dynamically attributes through the use
of XScript expressions.
Basically I want to implement a custom tag that will allow me to
do the following:
<custom:mytag value="{container.item.username}"/>
and then in the handler resolve {container.item.username} to
the correct object.
If not, how can I solve the issue of passing the object to my
custom tag?
TIA,
Claus Ljunggren

Answer 1

Eddie,
Thank you very much for your reply.
Actually I startet out using the exact method you suggest, but I found a
twist to make the solution far more elegant (in my oppinion that is).
My primary reason for creating the tags was to get rid of all those annoying
scriptlets. So naturally I didn't like the <%=%>'s! But it turns out that I
don't need them in my jsp's at all.
The netui-data:getData tag puts the value in the pageContext and the
pageContext is directly available from the TagSupport class! This means that
I can look the value up from the tag-handler instead of the jsp page. So all
I have to do is pass the name of the variable in the pageContext to my
tag-handler. End result beeing :
JSP:
<netui-data:getData value="{container.item.username}" resultId="username"/>
<custom:mytag resultId="username"/>
TAG-HANDLER:
public int doStartTag() {
String value = (String) pageContext.getAttribute(resultId);
Not the XScript vision I had, but close enough ... for now ;-)
Regards,
Claus Ljunggren
"Eddie O'Neil" <[email protected]> wrote in message
news:[email protected]...
Claus--
In 8.1, NetUI didn't expose a JSP tag SDK and thus we're not supportingbuilding custom tags that
extends NetUI ones.
That being said, there are some who are doing this, but there won't bea migration path for it
going from 8.1.x to 9.0.
The same functionality could be accomplished through a combination ofthe NetUI getData tag and
runtime expressions on your custom tags. For example:
<netui-data:getData value="{container.item.username}"resultId="theValue"/>
<custom:mytag value="<%= pageContext.getAttribute(theValue) %>"/>
This would also set your tags up well for the next WLS version and forNetUI in Beehive where we've
started using JSP 2.0 EL for expressions.
Hope that helps!
Eddie
Claus Ljunggren wrote:
Hi guys,
To simplify my jsp's in a portal 8.1 application I am considering
implementing some custom tags for often used constructs.
In this task I would like to pass some objects to the task-handler
and wonder if I can utilize dynamically attributes through the use
of XScript expressions.
Basically I want to implement a custom tag that will allow me to
do the following:
<custom:mytag value="{container.item.username}"/>
and then in the handler resolve {container.item.username} to
the correct object.
If not, how can I solve the issue of passing the object to my
custom tag?
TIA,
Claus Ljunggren