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radio button groups

Detecting selected radio button. by GIGN
Posted: 17 Dec 00

When radio buttons are created, we give them all the same name. These now are a group, and must be accessed using array notation. To detect which one has been selected we need to loop through them all, asking each one whether or not it has been chosen:

  function getValue(Obj_checkBoxGroup){
    
      
         for(j=0; j< Obj_checkBoxGroup.length; j++){
    
               if(Obj_checkBoxGroup[j].checked){
                       return checkBoxGroup [j].value;
               }
         
               else{}
      }                             
                
    }            
                
    

Send the function the group to work with like:
 <form>
 ...
  <input type="button" onClick="getValue(names)">
  <input type="checkbox" name="names" value="Gus">
  <input type="checkbox" name="names" value="Tony">
 ...
 </form>
 


 

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