[opencms-dev] about <cms:contentcheck> tag

[Stephan Hartmann]

Hi Alex,

here is the patch.

Tag contentshow now has two more attributes, "var" and "scope", that mainly
behave like in the set tag of the jstl core lib.
Examples:
<cms:contentshow var="test" element="Title" />
stores the value of the element title in a page-scoped (default) variable
called test.
Tests can now be performed like this:
<c:if test="${!empty test}"><c:out value="${test}"/></c:if>

If an element occurs multiple times, the var will become a list instead of a
string:
<cms:contentshow var="myTeasers" element="Teaser" />
<c:forEach var="myTeaser" items="${myTeasers}">
  <c:out value="${myTeaser}"/>
</c:forEach>

If you ommit the element attribute, var will become a map:
<cms:contentshow var="elements" />
<c:forEach var="element" items="elements">
  <c:out value="${element.key}" /> <c:out value="${element.value}" />
</c:forEach>

Regards,
Stephan

PS: Why not use java conventions for the tag names, i.e. contentShow?

----- Original Message -----
From: "Alexander Kandzior" <alex at opencms.org>
To: "'The OpenCms mailing list'" <opencms-dev at opencms.org>
Sent: Monday, November 15, 2004 1:13 PM
Subject: RE: [opencms-dev] about <cms:contentcheck> tag


Stephan,

Sounds like a good idea. As you probably know the implementations of the
contentXXX tags are in org.opencms.jsp in the CmsJspTagContentXXX classes.
If you could provide a patch against these that would be great.

FYT: It's likley that the "index" attribute of the "contentshow" tag will be
removed soon. The replacement mechanism is already in place, you will have
to <contentshow element="Title[0]"/> instead of <contentshow element="Title"
index="0"/>.

Best Regards,
Alex.

Alexander Kandzior
Alkacon Software - The OpenCms Experts
http://www.alkacon.com



> -----Original Message-----
> From: opencms-dev-bounces at opencms.org
> [mailto:opencms-dev-bounces at opencms.org] On Behalf Of
> Hartmann, Waehrisch & Feykes GmbH
> Sent: Monday, November 15, 2004 11:55 AM
> To: The OpenCms mailing list
> Subject: [opencms-dev] about <cms:contentcheck> tag
>
> Hi Developers, hi list,
>
> first of all i have to say that the new XML content mechanism
> ist quite exactly what OpenCms was missing most. Thanks for it!
>
> In a current project i came to the point where i had to
> create a new XML content which is not too complex but needs
> some conditional checking to decide which content to show.
> The contentcheck-tag seemed to be the way to check the
> existance of a value, but i found it not very useful. It only
> checks if the XML Content contains the defined element(s) but
> does not check if it is empty or not.
> But in most cases you already know which elements an XML
> content contains but you need to know if they are empty or not.
> A simple example is to display a link only if it is not empty.
>
> Anyway, i thought there is already a very powerful tag
> library to perform conditional checks, so i turned to use the
> jstl. It is just a little cumbersome to bring the values to
> scoped variables. Therefor it would be nice to have an
> additional attribute "var" for the contentshow tag to expose
> the value of the named element to this variable instead of
> writing it to the output. If no element is given, export all
> elements to a map. Elements that occur multiple times would
> become a list.
>
> The implementation should be quite simple and if others will
> find it useful i will see if i can do it.
>
> Regards,
> Stephan
>
>
> Stephan Hartmann
>
> Unternehmensberatung Währisch & Feykes GmbH Gustav-Adolf-Str.
> 5, 47057 Duisburg
> eMail: hartmann at waehrisch-feykes.de
> Internet: www.waehrisch-feykes.de
> Tel. +49 203 373070, Fax. +49 203 376766
>
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