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From "Jon Pearson" <Jon.Pear...@sixnet.com>
Subject RE: Radio button grouping in Struts 2
Date Mon, 04 May 2009 12:17:37 GMT
> Hi all,
> 
> I have a page which iterates over a collection of questions, 
> with each question having a number of radio buttons which can 
> be used to select the answer to that question. For example:
> 
> Question 1:   Unanswered O  Yes O  No O
> Question 2:   Unanswered O  Yes O  No O
> etc..
> 
> If the question has already been answered previously when the 
> pages loads then the appropriate Yes/No is selected; 
> otherwise Unanswered is selected.
> I've got this working fine using the following:
> 
> class Question {
>   long id;
>   String name;
>   String answer;
> }
> 
> class ViewQuestionsAction {
>   List<Question> questions;
>   Map<String,String> answersMap; // key == value at the 
> moment because didn't seem to work with int keys
> 
> <s:set name="answersMap" value="%{answersMap}"/> <s:iterator 
> value="questions">
>   <s:property value="name"/>
>   <s:radio name="%{id}" value="%{answer}" 
> list="#answersMap"/> </s:iterator> 
> 
> I need the name=%{id} bit so that I can group the radio 
> buttons per question. And this is the problem, because then I 
> can't find a way for when you submit the form to receive an 
> array of the selected buttons into the target action. The 
> above works on page load (grouped nicely), but on submit I 
> get all kinds of OGNL errors complaining about long id 
> invalid expressions (understandable I guess). But when I 
> choose a sensible name, for example:
> 
>   <s:radio name="responses" value="%{answer}" list="#answersMap"/>
> 
> I get an array of selected buttons in the target action's 
> responses property on submit but the radio grouping isn't 
> working - you can only select on radio button from the whole 
> page because they all share the same name element in the 
> HTML. I then tried:
> 
>   <s:radio id="ViewQuestions_responses" name="%{id}" value="%{answer}"
> list="#answersMap"/>
> 
> To try and force struts to set the responses property, but it 
> still tries to set the property from the name. Which makes me 
> think: if struts always uses the name to set the property, 
> and the browser always groups the radio buttons based on the 
> same name, is what I'm trying to do even possible?!?!
> 
> Any help gratefully received :)
> 
> Many thanks
> James
> 
> 
> 
> 
> --
> View this message in context: 
> http://www.nabble.com/Radio-button-grouping-in-Struts-2-tp2336
> 5502p23365502.html
> Sent from the Struts - User mailing list archive at Nabble.com.
> 
> 
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> 

You could, instead of relying on Struts2 to automatically call the
proper set* routines on submit, implement Preparable and manually parse
the results in the prepare() function, which is called BEFORE any set*
functions.

~Jonathan

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