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Posted to users@tapestry.apache.org by hese <10...@gmail.com> on 2010/11/10 22:24:23 UTC
a simple question
Hi,
I am using Tapestry 5. I see that in tapestry 4 it was possible to have
condition values in the if clause. Is something like this available in 5?
Is it possible to check for a particular string value in the t:if tag or is
it just boolean?
I want to do something like
if(str=='somevalue') {
} else {
}
Thanks
Hese
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Re: a simple question
Posted by Richard Hill <ri...@su3analytics.com>.
Excellent tips Thiago, cheers.
-----Original Message-----
From: Thiago H. de Paula Figueiredo <th...@gmail.com>
Reply-to: "Tapestry users" <us...@tapestry.apache.org>
To: Tapestry users <us...@tapestry.apache.org>
Subject: Re: a simple <t:if> question
Date: Thu, 11 Nov 2010 09:52:01 -0200
On Thu, 11 Nov 2010 08:15:33 -0200, Richard Hill <ri...@su3analytics.com>
wrote:
> In T5, 5.1 you can do something like this. In .tml:
> <t:if test="showTitle">
> <span>${reportTitle}</span>
> ...
> <t:parameter name="else">
> <span>No report to display</span>
> </t:parameter>
> </t:if>
> I believe the "else" syntax may have changed in T5.2.
There are now two syntaxes for passing values to parameters that are
blocks: <t:parameter name="xxx"> (Tapetry 5.0+) and <p:xxx> (Tapestry
5.1+).
I like to write if/else's this way:
<t:if test="showTitle">
<span>${reportTitle}</span>
</t:if>
<t:if test="!showTitle">
<span>No report to display</span>
</t:if>
Better yet, using invisible instrumentation (I love my templates to look
like HTML):
<span t:type="If" t:test="showTitle">${reportTitle}</span>
<span t:type="If" t:test="!showTitle">No report to display</span>
Still better yet, moving all the logic to the class, as there's always a
<span>:
public boolean getReportTitle() {
return reportId > 0 ? reportTitle : "No report to display";
}
<span>${reportTitle}</span>
:)
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Re: a simple question
Posted by hese <10...@gmail.com>.
wow! A wealth of information. Thank you all!
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Re: a simple question
Posted by "Thiago H. de Paula Figueiredo" <th...@gmail.com>.
On Thu, 11 Nov 2010 09:58:42 -0200, Christian Riedel
<cr...@googlemail.com> wrote:
>> public String getReportTitle()
> :-)
Yep, programming my e-mail client (Opera's M@) hasn't Java type checking .
. . :D
--
Thiago H. de Paula Figueiredo
Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
and instructor
Owner, Ars Machina Tecnologia da Informação Ltda.
http://www.arsmachina.com.br
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Re: a simple question
Posted by Christian Riedel <cr...@googlemail.com>.
> public String getReportTitle()
:-)
Am 11.11.2010 um 12:52 schrieb Thiago H. de Paula Figueiredo:
> On Thu, 11 Nov 2010 08:15:33 -0200, Richard Hill <ri...@su3analytics.com> wrote:
>
>> In T5, 5.1 you can do something like this. In .tml:
>> <t:if test="showTitle">
>> <span>${reportTitle}</span>
>> ...
>> <t:parameter name="else">
>> <span>No report to display</span>
>> </t:parameter>
>> </t:if>
>> I believe the "else" syntax may have changed in T5.2.
>
> There are now two syntaxes for passing values to parameters that are blocks: <t:parameter name="xxx"> (Tapetry 5.0+) and <p:xxx> (Tapestry 5.1+).
>
> I like to write if/else's this way:
>
> <t:if test="showTitle">
> <span>${reportTitle}</span>
> </t:if>
> <t:if test="!showTitle">
> <span>No report to display</span>
> </t:if>
>
> Better yet, using invisible instrumentation (I love my templates to look like HTML):
>
> <span t:type="If" t:test="showTitle">${reportTitle}</span>
> <span t:type="If" t:test="!showTitle">No report to display</span>
>
> Still better yet, moving all the logic to the class, as there's always a <span>:
>
> public boolean getReportTitle() {
> return reportId > 0 ? reportTitle : "No report to display";
> }
>
> <span>${reportTitle}</span>
>
> :)
>
> --
> Thiago H. de Paula Figueiredo
> Independent Java, Apache Tapestry 5 and Hibernate consultant, developer, and instructor
> Owner, Ars Machina Tecnologia da Informação Ltda.
> http://www.arsmachina.com.br
>
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Re: a simple question
Posted by "Thiago H. de Paula Figueiredo" <th...@gmail.com>.
On Thu, 11 Nov 2010 08:15:33 -0200, Richard Hill <ri...@su3analytics.com>
wrote:
> In T5, 5.1 you can do something like this. In .tml:
> <t:if test="showTitle">
> <span>${reportTitle}</span>
> ...
> <t:parameter name="else">
> <span>No report to display</span>
> </t:parameter>
> </t:if>
> I believe the "else" syntax may have changed in T5.2.
There are now two syntaxes for passing values to parameters that are
blocks: <t:parameter name="xxx"> (Tapetry 5.0+) and <p:xxx> (Tapestry
5.1+).
I like to write if/else's this way:
<t:if test="showTitle">
<span>${reportTitle}</span>
</t:if>
<t:if test="!showTitle">
<span>No report to display</span>
</t:if>
Better yet, using invisible instrumentation (I love my templates to look
like HTML):
<span t:type="If" t:test="showTitle">${reportTitle}</span>
<span t:type="If" t:test="!showTitle">No report to display</span>
Still better yet, moving all the logic to the class, as there's always a
<span>:
public boolean getReportTitle() {
return reportId > 0 ? reportTitle : "No report to display";
}
<span>${reportTitle}</span>
:)
--
Thiago H. de Paula Figueiredo
Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
and instructor
Owner, Ars Machina Tecnologia da Informação Ltda.
http://www.arsmachina.com.br
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Re: a simple question
Posted by Richard Hill <ri...@su3analytics.com>.
In T5, 5.1 you can do something like this. In .tml:
<t:if test="showTitle">
<span>${reportTitle}</span>
...
<t:parameter name="else">
<span>No report to display</span>
</t:parameter>
</t:if>
and in .java:
public boolean isShowTitle() {
return reportId > 0;
}
I believe the "else" syntax may have changed in T5.2.
R.
-----Original Message-----
From: hese <10...@gmail.com>
Reply-to: "Tapestry users" <us...@tapestry.apache.org>
To: users@tapestry.apache.org
Subject: a simple <t:if> question
Date: Wed, 10 Nov 2010 13:24:23 -0800 (PST)
Hi,
I am using Tapestry 5. I see that in tapestry 4 it was possible to have
condition values in the if clause. Is something like this available in 5?
Is it possible to check for a particular string value in the t:if tag or is
it just boolean?
I want to do something like
if(str=='somevalue') {
} else {
}
Thanks
Hese
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Re: a simple question
Posted by "Thiago H. de Paula Figueiredo" <th...@gmail.com>.
On Wed, 10 Nov 2010 20:56:55 -0200, Howard Lewis Ship <hl...@gmail.com>
wrote:
> Less expressive, but not less powerful. T5's property expressions are
> type-safe and non-reflective, with no unwanted synchronization logic, so
> I'd call that a better than even trade!
I stand corrected. :)
--
Thiago H. de Paula Figueiredo
Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
and instructor
Owner, Ars Machina Tecnologia da Informação Ltda.
http://www.arsmachina.com.br
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Re: a simple question
Posted by Howard Lewis Ship <hl...@gmail.com>.
On Wed, Nov 10, 2010 at 2:21 PM, Thiago H. de Paula Figueiredo <
thiagohp@gmail.com> wrote:
> On Wed, 10 Nov 2010 19:26:18 -0200, hese <10...@gmail.com> wrote:
>
> ...and is it possible to pass parameters into the if evaluating function
>> and receive a boolean/string back?
>>
>
> Hi!
>
> You pass a parameter to the If parameter (and any other parameter of any
> other component) using a binding. See
> http://tapestry.apache.org/tapestry5.1/guide/parameters.html for more
> information about bindings. If don't specify one, the default binding
> specified by the parameter is used. For the value parameter of If, the
> default binding is prop. It supports some expressions described in
> http://tapestry.apache.org/tapestry5.1/guide/propexp.html.
>
> Anyway, follow Inge's advice, which is very wise and based: logic belongs
> in classes, not in templates. That's a bit of what MVC means.
>
> Tapestry 4 uses OGNL as its expression binding, but Tapestry 5 has a
> deliberately less powerful expression binding due to the approach stated
> above.
>
>
Less expressive, but not less powerful. T5's property expressions are
type-safe and non-reflective, with no unwanted synchronization logic, so I'd
call that a better than even trade!
> --
> Thiago H. de Paula Figueiredo
> Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
> and instructor
> Owner, Ars Machina Tecnologia da Informação Ltda.
> http://www.arsmachina.com.br
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> For additional commands, e-mail: users-help@tapestry.apache.org
>
>
--
Howard M. Lewis Ship
Creator of Apache Tapestry
The source for Tapestry training, mentoring and support. Contact me to learn
how I can get you up and productive in Tapestry fast!
(971) 678-5210
http://howardlewisship.com
Re: a simple question
Posted by "Thiago H. de Paula Figueiredo" <th...@gmail.com>.
On Wed, 10 Nov 2010 19:26:18 -0200, hese <10...@gmail.com> wrote:
> ...and is it possible to pass parameters into the if evaluating function
> and receive a boolean/string back?
Hi!
You pass a parameter to the If parameter (and any other parameter of any
other component) using a binding. See
http://tapestry.apache.org/tapestry5.1/guide/parameters.html for more
information about bindings. If don't specify one, the default binding
specified by the parameter is used. For the value parameter of If, the
default binding is prop. It supports some expressions described in
http://tapestry.apache.org/tapestry5.1/guide/propexp.html.
Anyway, follow Inge's advice, which is very wise and based: logic belongs
in classes, not in templates. That's a bit of what MVC means.
Tapestry 4 uses OGNL as its expression binding, but Tapestry 5 has a
deliberately less powerful expression binding due to the approach stated
above.
--
Thiago H. de Paula Figueiredo
Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
and instructor
Owner, Ars Machina Tecnologia da Informação Ltda.
http://www.arsmachina.com.br
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Re: a simple question
Posted by hese <10...@gmail.com>.
ok thanks!
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Re: a simple question
Posted by Inge Solvoll <in...@gmail.com>.
Short answer: No.
You have to create a public method in the page class and refer to it. All
logic should be in java, not tml.
On Wed, Nov 10, 2010 at 10:26 PM, hese <10...@gmail.com> wrote:
>
>
> ...and is it possible to pass parameters into the if evaluating function
> and
> receive a boolean/string back?
>
> something like
> if( foo('somevalue) ) {
>
> } else {
>
> }
> --
> View this message in context:
> http://tapestry.1045711.n5.nabble.com/a-simple-t-if-question-tp3259452p3259456.html
> Sent from the Tapestry - User mailing list archive at Nabble.com.
>
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>
Re: a simple question
Posted by hese <10...@gmail.com>.
...and is it possible to pass parameters into the if evaluating function and
receive a boolean/string back?
something like
if( foo('somevalue) ) {
} else {
}
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Re: a simple question
Posted by ael <al...@dash.com.ph>.
YES...
tml
<t:if test="x"> x needs boolean
java
boolean x;
if(mystring.equals("tapestry"))
x = true
else
x=false
Hope you understand the logic.
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