javascript - form validation. Radio button check doesn't work and some other problems in form - 


<!doctype html> <html> <head> <title>signup</title> <link rel="stylesheet" href="style/style.css"> <style type="text/css"> #signup{      margin-left:200px;     margin-top:90px; } #signup input{     margin:2px 0px 20px 10px;     background-color:#eaeaea; }  #signup button{     font-size:16px; margin-top:50px; margin-left:150px; width:100px; height:31px; background-color:#333333; text-align:center; color:#fff; }    </style> <script> function signup() { var x1=document.forms["signupform"]["username"].value;  var x2=document.forms["signupform"]["email"].value;  var x3=document.forms["signupform"]["password1"].value;  var x4=document.forms["signupform"]["password2"].value;   var x5="";                                                      /* document.forms[0].radios array filled radio buttons. loop through of                                                       them , see if checked. if 1 is, transfer value of radio button                                                         user_input.*/ var atpos=x2.indexof("@"); var dotpos=x2.lastindexof(".");  if(document.getelementbyid('gender_male').checked) {     x5="male";  }else if(document.getelementbyid('gender_female').checked) {   x5="female"; }  if (x1==null || x1==""|| x2==null || x2==""||  x3==null || x3=="" || x4==null || x4=="" || x5=="")   {   alert("please fill required fields");   return false;   }  else if (x3!=x4){     alert("psswords not match");   return false; }  else if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x2.length)   {   alert("not valid e-mail address");   return false;    } else{      return document.forms[0].action = "signupdata.php"; } }  </script>  </head> <body> <?php include_once("template_pagetop.php"); ?> <div id=signup> <h2>sign here </h2> <form  method="post" name="signupform" > <table  border="0" cellpadding="2">   <tr>     <td >username:*</td>     <td ><input type="text" name="username" size="30"  ></td>   </tr>   <tr>     <td>email:*</td>     <td><input type="text" name="email" size="30" ></td>   </tr>    <tr>     <td>password:*</td>     <td><input type="password" name="password1" size="30" ></td>   </tr>   <tr>     <td>confirm password:*</td>     <td><input type="password" name="password2" size="30" ></td>   </tr>    <tr>     <td>gender:*</td>     <td ><input type="radio" name="gender" value="male" id="gender_male">male<br/>         <input type="radio" name="gender" value="female" id="gender_female">female</td>   </tr>    <tr>       <td><button  onclick= "signup()" >signup</button> </td>        <td><button type="reset" >cancel</button> </td>   </tr>  </table>  </form> </div> </body> </html>

there several things need improve in form.

  1. if there no errors how make signup page visible.(after clicking signup mine goes blank signupdata.php page.how stop this)
  2. how check if radio button (gender) has been filled.my form desn't check that.
  3. when field not filled , after error message pops filled areas (including correctly filled) vanishes.is there way stop , keep correctly filled data.

i new web design.any please.

if radio button mandatory ckeck default 1 of radio buttons.

<input type="radio" name="gender" checked  value="male" >male<br/>         <input type="radio" name="gender" value="female">female</td>

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