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Radio button validation

Hi guys,
I'm not good at javascript. I have a series of radio buttons on my form and it's required field. One has to be checked. Do you have any javascript code for it? Please help.
Apr 1 '08 #1
1 1160
For simple forms I mostly use something like this:

Expand|Select|Wrap|Line Numbers
  1. <html>
  2.   <head>
  3.     <title>testing</title>
  4.     <script type="text/javascript" language="JavaScript">
  5.  
  6.  
  7.       function isChecked(theInput) {
  8.         var result = false;
  9.         // for radiobuttons:
  10.         if (theInput[0] && theInput[0].type == 'radio') {
  11.           var el = theInput.length;
  12.           for (var x=0; x < el; x++) {
  13.             if (theInput[x].checked) {
  14.               result = true;
  15.               break;
  16.             }
  17.           }
  18.         // for checkboxes:
  19.         } else if (theInput.type == 'checkbox') {
  20.           if (theInput.checked) {
  21.             result = true;
  22.           }
  23.         }
  24.         return result;
  25.       }
  26.  
  27.       function validateForm(theForm) {
  28.         var result = true;
  29.         if (theForm.name == 'f1') {
  30.           // set mandatory fields
  31.           result = isChecked(theForm.r1) && isChecked(theForm.c1);
  32.         }
  33.  
  34.         if (theForm.name == 'f2') {
  35.           // do something different
  36.         }
  37.  
  38. /*debug*/alert(result);
  39.  
  40.         return result;
  41.       }
  42.  
  43.     </script>
  44.   </head>
  45.   <body>
  46.     <form name="f1" id="f1" onSubmit="validateForm(this)">
  47.       <input type="radio" name="r1" value="1"/>1<br/>
  48.       <input type="radio" name="r1" value="2"/>2<br/>
  49.       <input type="radio" name="r1" value="3"/>3<br/>
  50.       <input type="radio" name="r1" value="4"/>4<br/>
  51.       <input type="radio" name="r1" value="5"/>5<br/>
  52.       <input type="radio" name="r1" value="6"/>6<br/>
  53.       <br/><br/>
  54.       <input type="checkbox" name="c1" value="7"/>7<br/>
  55.       <br/>
  56.       <input type="submit"/>
  57.     </form>
  58.   <body>
  59. </html>
  60.  
  61.  
Apr 2 '08 #2

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