CODEWITHSUNDEEP
javaspringjakarta-eespring-mvc
renanleandrof
renanleandrof

Reputation: 7007

Spring MVC: Receive radio button values

I need to receive and unknown number of Radio Buttons values on my controller.

The radio buttons are generated and may vary... So i need a way to receive as many as the user send. How can i achieve this?

View (using Velocity): 

...
#foreach( $f in $model.fields )
<input type="radio" name="rd_$f.name" value="S" checked="checked"/> S
<input type="radio" name="rd_$f.name" value="C" /> C
#end
...

This will generate X number of radio buttons sets... I Need to receive it on my controller:

@RequestMapping(value = "/{e}/{id1}/{id2}", method = RequestMethod.POST)
    public ModelAndView salvar(@PathVariable(value = "e") String e,
            @PathVariable(value = "id1") Long id1, 
            @PathVariable(value = "id2") Long id2,
            //MY RADIO BUTTONS ARRAY HERE!
      ) {

          ...

    }

UPDATE:

The html generated is something like:

...
<input type="radio" name="rd_1" value="S" checked="checked"/> S
<input type="radio" name="rd_1" value="C" /> C
...
<input type="radio" name="rd_2" value="S" checked="checked"/> S
<input type="radio" name="rd_2" value="C" /> C
...
<input type="radio" name="rd_n" value="S" checked="checked"/> S
<input type="radio" name="rd_n" value="C" /> C
...

So i can't just bind to a [] on the controller, right?

Upvotes: 2

Views: 8922

Answers (2)

Teja Kantamneni
Teja Kantamneni

Reputation: 17472

You can bind using @RequestParam(value="radio_name") String[] radioCheckedValues as one more attribute in your spring controller.

EDIT The only way a server can know about what's coming from the client is using the name. You can use the request.getParameterNames.

Pseudo code...

List<String> values = new ArrayList();
Enumeration<String> enumeration = req.getParameterNames();
while (enumeration.hasMoreElements()) {
    String parameterName = (String) enumeration.nextElement();
    if(parameterName.startsWith("rd_")) {
        values.add(req.getParameter(parameterName));
    }
}

Upvotes: 4

Benoit Wickramarachi
Benoit Wickramarachi

Reputation: 6226

Use [] in the name to group each radiobox in one array:

#foreach( $f in $model.fields )
<input type="radio" name="radio[]" value="S" checked="checked"/> S
<input type="radio" name="radio[]" value="C" /> C
#end

Then read this array in the controller.

Edit:

To retrieve values use (loop on each array):

String[] params = request.getParameterValues("rd_n");

Upvotes: 1

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