Dynamic Attribute Class in Tag Lib TEI?

Hi All
I have had pretty good luck implementing a few tag libs.. my only question is..
Can you dynamically assign the class type of an attribute in the TEI of a Tag? Is there a way to get at the TEI of a tag at runtime?
As an example of what i'm asking to do, i would like to be able to return the variable "item" in a proper type so as to not have to cast it from a java.lang.object in the jsp script. (see the below code)
public class myTEI extends TagExtraInfo {
public VariableInfo[] getVariableInfo(TagData data) {
return new VariableInfo[] {
new VariableInfo("index", "java.lang.Integer", true, VariableInfo.NESTED),
new VariableInfo("item", "java.lang.Object", true, VariableInfo.NESTED)
Thanks for the help,
Rick

I propose you to pass object type as your tag attribute:
<your:tag ... type="your.type.YourType" />
And TEI class looks like:
new VariableInfo("item", data.getAttributeString("type"), true, VariableInfo.NESTED)

Similar Messages

Spec oversight? Using dynamic-attributes in XML tag files

I have a couple of tagfiles that generate form elements with specific conventions for the 'name' and 'value' attribute. Basically, a data binding framework.
Dynamic attributes are useful because you can delegate all the usual html attributes to the generated HTML form element: SELECT, INPUT, id, class etc.
The usual way to do this is to concatenate all the "pass-through" attributes to a string, and append this string to the element generated:
<input type="hidden" name="foo" ${dynattrs}/>I'm wondering how to do this in a tagfile in XML format (mytag.tagx), since the XML format forbids syntax like in the example above.
jsp:attribute won't help much, if it's nested inside a c:forEach: it won't apply to the right element.

Ran into the same problem with 'optional attributes'. (see post "JSP 2.0 Tag files outputting elements with conditional attributes" http://forum.java.sun.com/thread.jspa?forumID=45&threadID=681033)
Found a solution that is not very elegant but does work and saves you the trouble of reverting to Java Tags. Consider the following tag-file that outputs an html input-tag with conditional attributes:
<?xml version="1.0" encoding="utf-8"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"
     xmlns:c="http://java.sun.com/jsp/jstl/core">
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     <jsp:directive.attribute name="disabled" required="false" type="java.lang.Boolean"/>
     <jsp:directive.attribute name="hint" required="false" type="java.lang.String"/>
     <jsp:directive.attribute name="cssClass" required="false" type="java.lang.String"/>
     <jsp:text><![CDATA[<input type="text" name="]]><c:out value="${name}"/><![CDATA["]]></jsp:text>
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     <c:if test="${!empty cssClass}"><![CDATA[ class="]]><c:out value="${disabled?(cssClass + '-disabled'):cssClass}"/><![CDATA["]]></c:if>
     <c:if test="${disabled}"><![CDATA[ disabled="disabled"]]></c:if>
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          <c:when test="${!empty hint}"><![CDATA[ value="]]><c:out value="${hint}"/><![CDATA[" onfocus="if(this.value==']]><c:out value="${hint}"/><![CDATA[')this.value='';"]]></c:when>
     </c:choose>
     <jsp:text><![CDATA[/>]]></jsp:text>
</jsp:root>In answer to your question: Yes, it looks like an oversight. Using the jsp:attribute tag in a c:forEach doesn't work because the attribute is then applied to the forEach tag. You would have to put the attribute-tag inside a jsp:body tag (inside the forEach). Then it would apply not to the forEach tag but to the tag enclosing the forEach. However, this doesn't work either, or at least it doesn't work in Tomcat 5.5. Could be a bug though, JSP 2.0 is still very buggy (for instance, using a tagfile inside another tagfile from the same taglib doesn't seem to work either...)
Anyway, if you ever find a good solution please let me know by posting to this topic!
TIA

Dynamic attributes in custom tag

Hi,
I am new to JSP, and i want to build a custom tag. in this custom tag i have declared for example 5 attributes. i want to have a custom tag that when i set the attribute1 content to "true", only attribute2 and attribute3 would be accessible and if i set the attribute1 content to "false", only attribute4 and attribute5 would be accessible
<%@taglib uri="/WEB-INF/MyTLD2.tld" prefix="myTag" %>
<myTag:DB attribute1 ="true" attribute2="Table1" attribute3="ID,Name,Tel" />
<myTag:DB attribute1 ="false" attribute4="Table1" attribute5=" UpdateTable" />

Or you could go for a more general definition of what the attributes mean. Instead of having 5 attributes that the user only needs 3 of, you could do something like:
<myTag:DB sourceType="string" table="Table1" data="ID,Name,Tel"/>
<myTag:DB sourceType="table" table="Table1" data="UpdateTable"/>
(use just three attributes, all required, but with different expected values for the second or third attribute based on what the first one is).
Then have your tag do:
if ("string".equals(sourceType)) runStringSourceQuery(table, data);
if ("table".equals(sourceType)) runTableSourceQuery(table, data);Either way, good documentation is needed to make sure what is needed under what circumstances.

Accepting traditional %= ... % dynamic attribute values in tags

I am using Tomcat 5.5 (Servlet 2.4). This JSP code works:
<% String strFoo = "index.jsp"; %>
<jsp:include page="<%= strFoo %>"/>
... but this code that uses a custom tag I wrote doesn't work:
<% String strFoo = "index.jsp"; %>
<myutil:check url="<%= strFoo %>">
some content
</myutil:check>
I get an error:
An error occurred at line: nnn in the jsp file: /xxxxxx.jsp
Generated servlet error:
strFoo cannot be resolved
I have set the "url" attribute's rtexprvalue setting to "true" for the myutil:check tag in its .tld file.
Does anyone have an idea about what might be wrong? I would have thought that what works for a jsp:include attribute should work for any tag attribute value with runtime evaulation enabled.
Of course, I would rather be using EL expressions, but I have a large body of existing code that I need to get working with this servlet container quickly, and rewriting it all is not an option at the moment.
Thanks

Looks good to me. I can't think of any reason why it shouldn't work.
Can you please show the tld (or an example tld) defining this tag?
If you could have some 'dummy' code to duplicate the issue, it will be easier to help.
One thing you might try - take a look at the code generated by the conversion into servlet. It should be in the [TOMCAT]/work directory.
See if you can figure out from there why strFoo would not be in scope. Maybe you had it nested in another block?
Hope this helps,
evnafets

Tag Files: dynamic attributes

Hello,
I'm not quite sure what the following quote means. It's from the JSP 2.0 spec.
For dynamic-attributes attribute of Tag File:
"Only dynamic attributes with no uri are to be present in the Map; all other dynamic attributes are ignored."

Could someone help me here?

JSP Tag libs with struts Urgent

Hi
Has anyone implemanted jsp tag libs with the help of struts-bean.tld,struts-html.tld etc,
I need to use these , but I am not clear with how the page retrives the key values
example:
table width="400" cellpadding="10" cellspacing="0" border="0" bgcolor="#cccccc">
<tr>
<td valign="top" colspan="2">
<bean:message key="logon.welcome"/>
<html:errors/>
</td>
</tr>
<tr>
<bean:message key="logon.welcome"/>----?
I don't no how the"message bean" gets its key value dynamically? how it retrieves from its Application resource file? any idea?
Also has anyone implemanted jsp templates if so kindly guide me thru these
thanks!

Hi..
I am myself involved in implementing custom taglibs extending struts functionality. This can be done by extending the struts base classes and tag handlers. If you're still working on this topic, please let me know and we might share experiences.
Best regards,.
- Bj�rn Syse, [email protected]
Hi
Has anyone implemanted jsp tag libs with the help of
struts-bean.tld,struts-html.tld etc,
I need to use these , but I am not clear with how the
page retrives the key values
example:
table width="400" cellpadding="10" cellspacing="0"
border="0" bgcolor="#cccccc">
<tr>
<td valign="top" colspan="2">
<bean:message key="logon.welcome"/>
<html:errors/>
</td>
</tr>
<tr>
<bean:message key="logon.welcome"/>----?
I don't no how the"message bean" gets its key value
dynamically? how it retrieves from its Application
resource file? any idea?
Also has anyone implemanted jsp templates if so
kindly guide me thru these
thanks!

Create a dynamic attribute for each user

Hi All,
I request you all to let me know how to give an approach to the following requirement.
REQUIREMENT: I have to create a dynamic attribute in UME for each user and the read the attribute on lead selection of a table having list of Users.
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Looking forwarrd for your help.
Regards
Dipendra

//@@begin javadoc:UMSavePropertiesByNode()
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//@@end
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Dynamic Attributes with UDF - NullPointerException

Hello,
I want to set the file name of an file receiver by means of setting dynamic attributes in an UDF.
I use the following code and map the output to the root node of the target message (one input variable is var1)
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String myFileName = var1;
conf.put(key, myFileName);
return "";
When I want to test the mapping using the test tab I get a null pointer exception:
Exception:[java.lang.NullPointerException] in class com.sap.xi.tf
Could the reason be, that setting dynamic attributes does not work when testing a mapping as the mapping has to be called by the IE runtime or is there any other reason?

Hi Florain,
I can understand, but that is how it is designed because the filename paramter can be picked up only during the runtime. But if you use other parameters like interface, sender name etc you can test it in mapping. Please go to test tab and click on parameters tab. There you see few parameters for runtime also. You can put some value there and then you can test the mapping and you will not receive that error. You dont have filename there, so thats the reason why you are getting error. Hope in next release SAP would come up with this option.
Regards,
---Satish

Deferred EL in dynamic attributes

According to the Sun Java EE 5 tutorial, using deferred EL ( #{} syntax) is forbidden for usage in a tag's dynamic attributes.
What's the exact use of making this illegal? (what problem does this rule solve?)
Anyway, I'm asking since I have developed lots of JSF 1.1 components with dynamic attributes that accept EL expressions. Technically it's not a problem. In the tag handler, I just itterate over all collected attributes, check if they're EL using the JSF API and if so create a value binding for them.
However, in JSP 2.1/JSF 1.2 the container prevents the "#{...}" string from reaching my tag handler code. This is very nasty. I can of course disable container evaluation for the entire page, but this is quite an ugly solution.
Is there any neat workaround for this problem?

When in doubt, check
the 2.1 spec. I'm guessing that the tutorial has a
doc error.You're right, I checked the (may 2006) JSP 2.1 spec, and on page 2-72, section 3 it says:
Dynamic attributes must be considered to accept request-time expression values
as well as deferred expressions.So, the tutorial is definitely wrong.
Maybe someone should notify Sun about this? It seems most people would resort to reading tutorials first instead of wading through the spec. Especially if a Sun tutorial states something, many people will probably consider it 'official'. Perhaps even the Tomcat folks have read said tutorial instead of the spec. Using an EL value in a dynamic attribute in Tomcat 6 causes a translation error.
Btw, I'm not 100% sure how to interpret this note from the spec:
Note that passing a String literal as a dynamic attribute will never be considered
as a deferred expression.What other way is there to pass a deferred expression than through a String litteral?

Fixed values of dynamic attributes are not displayed for bid response

Hi
I have created a bid with dynamic attributes and have weighted the options with fixed values. I publish the Rfx (bid) and all is ok. The problem is that the fixed values are not displaying when doing a bid response.
We are using SRM 7.0
Can anyone help?

No. Not yet. I think it is a bug. You should create an OSS message to SAP and ask them to pay special attention to the following code block:
Class: /SAPSRM/CL_CH_WD_DODM_DYNATTR
Method: /SAPSRM/IF_CLL_MAPPER~REFRESH
At the end of the method, look for code context:
IF lv_object_type = c_qte.
*Set the Fixed Values Table to Invisible
lv_visible = abap_false.

How to use JSP custom tag lib in PAR file?

Hi All,
I am trying to customize mastheaderpar file. For that I have downloaded relevant par file and making the changes accordingly.
As part of the changes I would require to use JSP custom tag library in my par file.
I have the TLD file and relevant classes in the jar file. I would like to know where and what kind of modifications have to be done to use the jsp custom tag library.
I tried modifying some things in portalapp.xml but was not successful.
Please help me on how to proceed with this? It would be great if you can provide the xml entry to use this tag library
Thanks
Santhosh

Hi Johny,
Thanks for the reply. Actually I am able to change colors etc. with out any problem.
My requirement is to use XMLTaglib in mastheader par file. This tag lib is from apache tomcat. I have the relevant TLD and class files. I copied TLD file into taglib dir of portal-inf and class file in src api.
And I have added the following line in portalapp.xml under component-profile section of default
<property name="tlxtag" value="/SERVICE/Newmastheader/taglib/taglibs-xtags.tld">
Is this the right way to use tag lib? Actually before adding this line I used to get the error saying "Error parsing taglib", but now the error does not occur and I am getting new error. This is an exception in one of the taglib classes.
Could any one provide me some inputs on how to check this error?
Thanks
Santhosh

Dynamic attribute in CRM Loyalty

Hi,
I am creating a new dynamic attribute for Year to Date total amount spent by a customer when a member activity gets created. I created the dynamic attribute in SPRO under the Marketing->loyaltyPrograms->dynamic attribute. The attribute is added under loyalty program and also created a new reward rule to update the attribute specifically.
I want to update the total spending from Jan1st to Dec31st in this dynamic attribute. I don't see the activity date in the formula, so i can write a rule that if the activity date is between 01.01 to 12.31. add the spending to the attribute and reset it if the date is 01.01.

can we have a hashmap which stores all the unknown
attributes into the hashmap upon loading and then
handle it in the setpropertiesJSF's UIComponent has a function of generic attributes.
Use <f:attribute>.
<cx:inputText value="" foo="footest"/> Anyway, if you want to use the syntax like this, you should provide a custom
tag handler which has a setFoo() method and whose setProperties() method
copys the value to the corresponding (generic) attribute of the component.

Custom tag lib with output parameter

Hi,
I need a tag libray that gives me a specific element of a Vector.
Here there is the line I have in my jsp.
<ct:partizione tronco="${contenitoreCentralineTronco}" indice="index" partizione="tmpPartizione"/>
...-contenitoreCentralineTronco is an Object that contains a Vector of other specif objects.
-indice is the vector index of the specif instance I need.
-partizione should be the output instance.
This is part of my tld file:
    <tag>
         <name>partizione</name>
        <tagclass>ss.aspi.classi.centraline.grafica.tagSupport.Partizione</tagclass>
        <bodycontent>empty</bodycontent>
        <info>Estrae una partizione da un vettore di partizioni dato l'indice</info>
        <attribute>
            <name>tronco</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>indice</name>
            <required>true</required>
        </attribute>
        <attribute>
            <name>partizione</name>
            <required>false</required>
        </attribute>
     </tag>
...this is part of the class called by the tag:
     private ContenitoreTroncoBean tronco;
     private Integer indice;
     private ContenitorePartizioneBean partizione;
     public int doStartTag() throws JspException {
          try {
               Vector<ContenitorePartizioneBean> partizioni = tronco.getPartizioniBean();
               partizione = partizioni.get(indice);
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jsp.error.beans.property.conversion
looking deeper in the class code jenerated from the jsp, I noted that the problem refers to the third attribute of the tag <ct:partizione>.
It seems It trys to set the attribute "partizione" with the value "tmpPartizione", but partizioni should be an output attribut non input. The varible tmpPartizione doesn't exist... the tag should create it.
I realized I didn't get how I should create a tag with output parameters.
Anyone can explane me it?
Thanks.

One suggestion: Take a closer look at the EL (expression language)
It has an excellent syntax for accessing collections/maps
${contenitoreCentralineTronco[index]} would exactly what you want, without having to write a custom tag for it.
If you REALLY want to do this as a custom tag, then you need to treat the input attribute as a String (the name of the variable you are going to create?) Right now your tag declares the attribute partizione as being of type ContenitorePartizioneBean which is probably the cause of the problem - you are passing it a String.
Cheers,
evnafets

JSTL pass through dynamic-attributes

Folks,
Hi. I'm just learning Java, JSP & JSTL, and I've hit a bit of a curly one.
What's the best way to pass dynamic-attributes from a JSTL tag to another JSTL tag? Is there a way to pass them directly as a Map?
I wrote a generic-html-table-maker custom JSTL tag called "tabulator.tag" (based on one of the examples in JavaServer Pages by Hans Bergsten).
"tabulator.tag"
<%-- format contents as a HTML table --%>
<%@ tag body-content="empty" dynamic-attributes="dynattrs"
      import="java.util.*" %>
<%@ attribute name="content" required="true" type="java.util.Map" %>
<%@ attribute name="caption" %>
<%@ attribute name="headers" type="java.lang.Boolean" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<table
<c:forEach items="${dynattrs}" var="a">
    ${a.key}="${a.value}"
</c:forEach>
>
<c:if test="${!empty caption}">
    <caption>${caption}</caption>
</c:if>
<c:if test="${headers}">
    <tr>
      <th>Name</th>
      <th>Value</th>
    </tr>
</c:if>
<c:forEach items="${content}" var="row">
    <tr>
      <td>${row.key}</td>
      <td>${row.value}</td>
    </tr>
</c:forEach>
</table>This works fine when called from directly from jsp as below:
"tabulator_test.jsp"
<%-- format request headers as a HTML table --%>
<%@ page contentType="text/html" %>
<%@ taglib prefix="my" tagdir="/WEB-INF/tags/mytags" %>
<my:tabulator
headers="true" caption="Tabulated Request Headers" content="${header}"
border="1" cellspacing="0" cellpadding="2"
/>BUT... Now I'm trying to write a "requestHeaders.tab" just to "centralise" the table attributes... but I can't figure out how to pass the dynamic-attributes (containing the html table attributes) from "requestHeaders.tab" through to tabulator.tab
"headers2.tab" (aka "requestHeaders.tab")
<%-- format request headers as a HTML table --%>
<%@ tag body-content="empty" dynamic-attributes="dynattrs" %>
<%@ attribute name="caption" required="true" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="my" tagdir="/WEB-INF/tags/mytags" %>
<%-- build a string of the dynamic-attributes --%>
<c:set var="s">
<c:forEach items="${dynattrs}" var="a">
    ${a.key}="${xmlEncode(a.value)}"
</c:forEach>
</c:set>
s: ${s}
<%-- and pass them to tabulator --%>
<my:tabulator content="${header}" caption="${caption}" ${s} />... throws the below Tomcat Error when called by ...
"headers2.jsp"
<%@ page contentType="text/html" %>
<%@ taglib prefix="my" tagdir="/WEB-INF/tags/mytags" %>
<html>
<body>
    <my:headers2 caption="Request Headers"
      border="1" cellspacing="0" cellpadding="5"
    />
</body>
</html>
Apache Tomcat/5.5.17 - Error report
exception
org.apache.jasper.JasperException: /WEB-INF/tags/mytags/headers2.tag(14,55) Unterminated <my:tabulator tag
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
org.apache.jasper.JasperException: /WEB-INF/tags/mytags/headers2.tag(14,55) Unterminated <my:tabulator tag
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
                       ....This is just an intellectual exersice, but it's sucked me in... any help be greatly appreciated.
Thanx. KRC>

This always requires some work around. I have done two things in the past:
1) Create a variable on the page or request scope that contains the dynamic attributes you want to use:

<my:requestHeader content="${header}" border="0" cellspacing="1" cellpadding="2" />

<%@ tag body-content="empty" dynamic-attributes="dynamicAttributes" %>
<%@ attribute name="content" required="true" type="java.util.Map" %>
<c:set var="HtmlTableDynamicAttributes" value="dynamicAttributes" scope="page"/>
<my:htmlTable content="${content}" />

<%@ tag body-content="empty" dynamic-attributes="dybamicAttributes" %>
<%@ attribute name="content" required="true" type="java.util.Map" %>

<c:if test="dynamicAttributes == null">
<c:set var="dynamicAttributes" value="HtmlTableDynamicAttributes"/>
</c:if>
//then do table work using "dynamicAttributes"Another way I had done it was to create a tag that needs to be nested in the <my:htmlTable> tag that assigns attributes as needed. So the my:htmlTable tag might need to be called like this:
<my:htmlTable content="${content}">
<my:htmlTableAttribute name="${key}" value="${value}"/>
</my:htmlTable>Finally, after thinking about this in this email, I wonder what scope the variable created by dynamic-attributes="dybamicAttributes" is stored in. I assumed it was a scope too small for the next tag to see. But maybe you could just try to see if the variable is present:

<my:requestHeader content="${header}" border="0" cellspacing="1" cellpadding="2" />

<%@ tag body-content="empty" dynamic-attributes="dynamicAttributes" %>
<%@ attribute name="content" required="true" type="java.util.Map" %>
<my:htmlTable content="${content}" />

<%@ tag body-content="empty" %>
<%@ attribute name="content" required="true" type="java.util.Map" %>
Dynamic Attributes Seen? da="${dynamicAttributes}"</br>
//then do table work using "dynamicAttributes"

Problem in using JSTL tag libs

Hi there,
I am trying to use JSTL tag libs in my web app, but i get the following error message:
org.apache.jasper.JasperException: /index.jsp(22,0) According to TLD or attribute directive in tag file, attribute test does not accept any expressions
as it might be clear i am using Tomcat and line 22 of the code for index.jsp is:
<c:if test="${user.role > 0 }">
Please help my identify whats wrong in there. I suspect that it is because of my web.xml file, but i am not sure.
thanx in advance,
Capitan Haddock

try to use gt instead of >

Dynamic Attribute Class in Tag Lib TEI?

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