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Posted to user@struts.apache.org by "Varley, Roger" <Ro...@atosorigin.com> on 2004/08/27 13:26:36 UTC
LookupDispatchAction (Newbie)
Hi
I have implemented a LookupDispatchAction action class to deal with a form that contains multiple submit buttons as outlined in the sample chapter from "The Struts Survival Guide" at http://www.objectsource.com/Chapter4.pdf I've got everything working but I would be grateful if someone could either explain or point me to documentation explaining, *why* it works?
Regards
Roger
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Re: LookupDispatchAction (Newbie)
Posted by Michael McGrady <mi...@michaelmcgrady.com>.
Once you see how LookupDispatchAction works, you should also see that it
is an unnecessarily complicated solution. Try
http://wiki.apache.org/struts/StrutsCatalogMultipleImageTagsSimplified
which shows that all you have to do is:
String button = null;
Enumeration enum = request.getParameterNames();
String parameterName = null;
while(enum.hasMoreElements()) {
parameterName = (String)enum.nextElement();
if(parameterName.endsWith(".x")) {
button = parameterName.substring(0,parameterName.indexOf('.'));
}
}
Isn't that a great deal simpler? If you want to solve it with a class,
then do somethin like:
*public class ImageTagUtil {
public static String getName(HttpServletRequest request) {
String command = null;
String buttonValue = null;
Enumeration enum = request.getParameterNames();
while(enum.hasMoreElements()) {
buttonValue = (String)enum.nextElement();
if(buttonValue.endsWith(".x")) {
command = buttonValue.substring(0,buttonValue.indexOf('.'));
}
}
return command;
}
}*
However, if you love the complications, essentially the idea is to put
the paramter value together with method names in order to map the
buttons to methods. So, if you have buttons returning button.add and
button.delete, your parameter value will be "button". Once you know
that the parameter is button, then you can search for button.? and ?
will be the method name. This is a totally unnecessary complication,
since we already have .x and .y at the end so generously supplied by the
standard HTML. So the above code does the same thing without tying the
solution to the parameter value, which frees the parameter value for
other uses and which decouples the solution from struts.
Regards,
Michael
>
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Re: LookupDispatchAction (Newbie)
Posted by Bill Siggelkow <bi...@bellsouth.net>.
http://struts.apache.org/api/org/apache/struts/actions/LookupDispatchAction.html
Bill Siggelkow
Varley, Roger wrote:
> Hi
>
> I have implemented a LookupDispatchAction action class to deal with a form that contains multiple submit buttons as outlined in the sample chapter from "The Struts Survival Guide" at http://www.objectsource.com/Chapter4.pdf I've got everything working but I would be grateful if someone could either explain or point me to documentation explaining, *why* it works?
>
> Regards
> Roger
>
>
> __________________________________________________________________________
> This e-mail and the documents attached are confidential and intended
> solely for the addressee; it may also be privileged. If you receive this
> e-mail in error, please notify the sender immediately and destroy it.
> As its integrity cannot be secured on the Internet, the Atos Origin group
> liability cannot be triggered for the message content. Although the
> sender endeavours to maintain a computer virus-free network, the sender
> does not warrant that this transmission is virus-free and will not be
> liable for any damages resulting from any virus transmitted.
> __________________________________________________________________________
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Re: LookupDispatchAction (Newbie)
Posted by Leandro Melo <lt...@yahoo.com.br>.
A quick look at the DispatchAction source (if you
don`t have the source, you can download it) would the
best way for you to understand. It`s not that
complicated.
I never took a detailed look at the source, but
basically, it gets the mapping for the method
specified in struts-config.xml and then get the value
of this parameter. After that it dispatches the
request to the specifc method a calling to
dispatchMethod() method.
--- "Varley, Roger" <Ro...@atosorigin.com>
escreveu:
> Hi
>
> I have implemented a LookupDispatchAction action
> class to deal with a form that contains multiple
> submit buttons as outlined in the sample chapter
> from "The Struts Survival Guide" at
> http://www.objectsource.com/Chapter4.pdf I've got
> everything working but I would be grateful if
> someone could either explain or point me to
> documentation explaining, *why* it works?
>
> Regards
> Roger
>
>
>
__________________________________________________________________________
> This e-mail and the documents attached are
> confidential and intended
> solely for the addressee; it may also be privileged.
> If you receive this
> e-mail in error, please notify the sender
> immediately and destroy it.
> As its integrity cannot be secured on the Internet,
> the Atos Origin group
> liability cannot be triggered for the message
> content. Although the
> sender endeavours to maintain a computer virus-free
> network, the sender
> does not warrant that this transmission is
> virus-free and will not be
> liable for any damages resulting from any virus
> transmitted.
>
__________________________________________________________________________
>
>
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