javascript validation

I need to validate password with following conditions through java script:

min 6 characters, max 50 characters
must contain 1 letter
must contain 1 number
may contain special characters like [email protected]#$%^&*()_+

View Answers

August 7, 2013 at 11:54 AM

      <html>
        <head>
        <title>Java Script Strong Password Validtion</title>
        </head>
        <head>
        <script>
          function display()
          {
              document.getElementById("displayarea").innerHTML = document.getElementById("username").value;    
              document.getElementById("username").value = "";
              document.getElementById("displayarea1").innerHTML = document.getElementById("password").value;    
              document.getElementById("password").value = "";

              }
           </script>
        <script language="javascript">
        function isStrongPassword()
        {

           var control = document.PasswordForm.password;
           var myString= control.value;


           var Stringlen = myString.length;
           var ValidateDigits = /[^0-9]/g;
           var ValidateSpChar = /[a-zA-Z0-9]/g;
           var ValidateChar = /[^a-zA-Z]/g;

           var digitString = myString.replace(ValidateDigits , "");
           var specialString = myString.replace(ValidateSpChar, "");
           var charString = myString.replace(ValidateChar, "");

           if(Stringlen > 50 || Stringlen < 6)
           {
           alert("Password length must be between 6-50 characters");
           control.value="";
           control.focus();
           return false;
           }
           if(specialString < 1)
           {
           alert("Passwords must include at least 1 special (#,@,&,$ etc) characters");
           control.value="";
           control.focus();
           return false;
           }
           if(digitString < 1)
           {
           alert("Passwords must include at least 1 numeric characters");
           control.value="";
           control.focus();
           return false;
           }
           else{
           display();
           }
        }
        </script>
        </Head>
           <h2 align="Center">Registration</h2>
         <body>
          <form id=form1 name=PasswordForm>
          <table align="center">

             <tr>
             <td>UserName:</td>
             <td><INPUT id=username name=username size="20"></td>
             </tr>

            <tr>
            <td>Password:</td>
            <td><INPUT id=password name=password size="20"></td>
            </tr>
            <tr>
            <td><INPUT id=register type=button value=Submit name=Submit onclick='javascript:isStrongPassword()'></td>
            </tr>
            </table>
            <table width="400px" align="center" border=0> 

            <tr style="background-color:#8FBC8F;">
                <td align="center"><b>User Name</b></td>
                <td align="center"><b>Password</b></td>
                </tr> 
                <tr>
                <td align="center"><div id="displayarea"></div></td>
                <td align="center"><div id="displayarea1"></div></td>
                </tr>
            </table>
            </form>
            </body>
            </html>

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