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

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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="id" required="false" type="java.lang.String"/>
     <jsp:directive.attribute name="value" required="false" type="java.lang.String"/>
     <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="${name}"/><![CDATA["]]></jsp:text>
     <c:if test="${!empty id}"><![CDATA[ id="]]><c:out value="${id}"/><![CDATA["]]></c:if>
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</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,
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<%@taglib uri="/WEB-INF/MyTLD2.tld" prefix="myTag" %>
<myTag:DB attribute1 ="true" attribute2="Table1" attribute3="ID,Name,Tel" />
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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:
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Then have your tag do:
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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) {
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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" />
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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.
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//@@end
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Setting an attribute value of a tag equal to a String variable in scope

Hi,
I don't think this is possible because I get an "expression not allowed" error when trying it. But long story short I'm trying dynamically set attribute values on a taglib. For example:
<%
String value="attributevalue";
// set the attribute of the tag below equal to this variable value
%>
<tag:mytaglib name="<%=value%>"/>
I looked at the generated jsp page and seems like the variable "value" is not in scope of the method that processes the tag. Does anyone have any ideas or can confirm that there is no way to do this. Thanks!

You can do it.
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    </attribute>This should do the trick.
Let us know if it worked for you.
Thanks and regards,
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Use jsp tag output as another tag's attribute value

I don't know anyone has ever tried this, one tag's attribute value needs to be dynamically set using another tag's output. Something like
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I want the cols attribute of grid tag to be the output of <layout:write name="element" property="value"/>
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something like this...
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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.
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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
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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:
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Could someone help me here?

Custom tag attribute values..

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It seems like you want to be able to clear the default attribute and set an empty attribute in you custom tag. One way around this would be to pass a blank character in. That would force the default to be cleared with the blank. You could take it a step further and trim the attribute value before storing it. Alternatively you could set an overriding attribute such as:
<slasher:foo name="slasher" ignorewhatever="true" />
protected String whatever = "some default Value";
public void setWhatever(String whatever)
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public void setIgnorewhatever(String ignore)
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"Unterminated value for attribute '' in XML Tag ''.(SBL-UIF-00265)"

Getting this message when I do Edit Web Layout for a view in Siebel tools 7.8.2 "Unterminated value for attribute '' in XML tag ''.(SBL-UIF-00265)"...Anyone have any idea why I am getting this message?

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Okay, so I've tried deleting the tag and now I can't name the pin at all.
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Is it possible to regroup data based on attribute value of a tag?

is it possible to regroup data based on attribute value of a tag?

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Thanks & Regards,
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Accepting traditional %= ... % dynamic attribute values in tags

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