[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
4:53 a.m.
A limitation in the expression language enhancements is not documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: Documentation, EL, JSF
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method Bindings"
and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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4:53 a.m.
New subject: [jbossseam-issues] [JBoss JIRA] Updated: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=all ]
Wise Guy updated JBSEAM-1733:
-----------------------------
Affects: [Documentation (Ref Guide, User Guide, etc.)]
Complexity: Low
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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11:24 a.m.
New subject: [jbossseam-issues] [JBoss JIRA] Closed: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=all ]
Gavin King closed JBSEAM-1733.
------------------------------
Resolution: Rejected
-1
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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11:50 a.m.
New subject: [jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=comments#action_12370277 ]
Wise Guy commented on JBSEAM-1733:
----------------------------------
I take that "-1" as "negative". I take that answer as Gavin not having
read what the issue states.
I hope there would be as few as possible conflicts like this in Seam's path.
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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11:58 a.m.
New subject: [jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=comments#action_12370280 ]
Wise Guy commented on JBSEAM-1733:
----------------------------------
Oops, I was wrong about the note I made about 29.2., my bad...
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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11:58 a.m.
New subject: [jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=comments#action_12370281 ]
Gavin King commented on JBSEAM-1733:
------------------------------------
Of course I have read it, and I rejected it because it is not a limitation of the EL.
Instead it is to do with your not understanding the state model of JSF. We have been going
around in circles on this for days now, and instead of trying to actually *understand* how
Seam/JSF works, and how state may be legitimately passed between requests, you are far to
busy trying to be "right" and proving that I am wrong/ignorant. Can we please
just drop this and get on with real work now.
Eventually, once you get a bit more experience with Seam and insight into state management
in JSF and Seam, you will understand why what you are trying to ask for is non-doable.
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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12:01 p.m.
New subject: [jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=comments#action_12370283 ]
Wise Guy commented on JBSEAM-1733:
----------------------------------
I'm OK with what you said and have no more comments on the issue.
What I said in this issue is not that JBoss EL is limited. I wanted to propose a way so
that others don't start to think the wrong way: the one I did...
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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12:04 p.m.
New subject: [jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=comments#action_12370285 ]
Gavin King commented on JBSEAM-1733:
------------------------------------
For example, the following works:
@Name("foo")
@Scope(CONVERSATION)
public class Foo() { ... }
@Name("bar")
public class Bar() {
public void bar(Foo foo);
}
<s:link action="#{bar.bar(foo)}"/>
And even this works:
@Name("foos")
@Scope(CONVERSATION)
public class Foos() implements DataModel { ... }
@Name("bar")
public class Bar() {
public void bar(Foo foo);
}
<ui:repeat value="#{foos}" var="foo">
<s:link action="#{bar.bar(foo)}"/>
</ui:repeat>
The only "limitation" is that you can't pass an object that only exists in
one context into a totally different context. It should be clear that this is a perfectly
reasonable restriction.
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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12:23 p.m.
New subject: [jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1733) A limitation in the expression language enhancements is not documented
[ http://jira.jboss.com/jira/browse/JBSEAM-1733?page=comments#action_12370288 ]
Wise Guy commented on JBSEAM-1733:
----------------------------------
I think you mean the object returned by LocaleSelector.getSupportedLocales() is not
scoped. I know that and I know this will be the reason curLocale in my example cannot be
evaluated after the link is clicked.
What I wanted to note is that if someone wants to have variable evaluated to a literal
string and at the same time this variable should be used in a MethodBinding, these two are
impossible. Maybe my example was not good. Instead of:
#{localeSelector.selectLanguage(curLocale.value)}
I should've have noted it:
#{localeSelector.selectLanguage('#{curLocale.value}')}
So that one can easily see the syntax is wrong. You cannot both evaluate
#{curLocale.value} to "de" and pass
#{localeSelector.selectLanguage('de')} as MethodBinding. What you should do is
separately pass the variable as a request parameter (as the workaround stated). Yes, I
finally agree that the workaround is the best solution.
I wanted this cleared out for the users in the reference manual. I guess the discussions
made here and on the forum are already enough. If you don't want to include it there,
I'm ok with that.
Sorry for taking so much attention on this issue. As I stated this was not my intention. I
have great respect for your work. Please continue what you do best.
A limitation in the expression language enhancements is not
documented
----------------------------------------------------------------------
Key: JBSEAM-1733
URL: http://jira.jboss.com/jira/browse/JBSEAM-1733
Project: JBoss Seam
Issue Type: Task
Components: JSF, Documentation, EL
Reporter: Wise Guy
Priority: Minor
There is a limitation in the expression language enhancements that is not documented. It
would look like this:
---
http://docs.jboss.com/seam/2.0.0.B1/reference/en/html/elenhancements.html
Chapter 29. Expression language enhancements
29.1.2. Limitations
29.1.2.3. Cannot pass a variable to a MethodBinding
You may not pass a variable to a MethodBinding, hence the following syntax is not valid:
<ui:repeat var="curLocale"
value="#{localeSelector.supportedLocales}">
<s:link value="#{curLocale.label}"
action="#{localeSelector.selectLanguage(curLocale.value)}"/>
</ui:repeat>
Seam cannot evaluate "curLocale.value" in the rendering phase because it is a
part of a MethodBinding. If you need to do implement the same functionality then use the
f:param tag:
<s:link value="#{curLocale.label}"
action="#{localeProvider.updateLocale()}">
<f:param name="l" value="#{curLocale.value}"/>
</s:link>
Then, having the field variable "l" injected as a @RequestParameter, you would
do this:
public void updateLocale() {
if (l != null && l.length() > 0) {
localeSelector.selectLanguage(l);
}
}
--
May I also point out that you should merge "29.1. Parameterized Method
Bindings" and "29.2. Parameterized Value Bindings". (2.0.0.B1/reference)
Thank you for the attention
--
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6363
days inactive
6363
days old
8 comments
2 participants
participants (2)
-
Gavin King (JIRA) -
Wise Guy (JIRA)