Código PHP:
   <!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
<script language="Javascript" type="text/javascript">
function validate() {
    
        document.getElementById('buybox_form').submit();
    }
</script>
</head>
<body>
<form action="/cgi-bin/cart.cgi" method="post" name="buybox_form">
<select name="colors">
  <option value="blue">blue</option>
  <option value="black">black</option>
  <option value="white">white</option>
</select>
<input name="submit" type="button" onClick="validate()" value="submit">
</form>
</body>
</html> 
   Código PHP:
   <script language="Javascript" type="text/javascript">
function validate() {
    
        document.buybox_form.submit();
    }
</script> 
   Código PHP:
   <script language="Javascript" type="text/javascript">
function validate() {
    
        document.forms.buybox_form.submit();
    }
</script> 
    
 



 
 

