Hi wise monks...
This is my first posting in perlmonks.com :-). This is not full fledged perl but focus is on javascript.Hope this code will be helpful for some who wants to validate HTML form by generating javascript through perl.
Any optimization/suggestion will be helpful...

The basic idea is to pass the HTML form name followed by $required which accepts the required text fields delimited by commas.(i.e. the texbox names which should not be empty. ex: userid,password)

$password: gets two password fields including the password confirmation textbox delimited by colon.

Similarly select boxes, radio and checkboxes fieldnames are passed by comma delimiters.

$chkforword is used to validate the field value for a single word which accepts only word characters \w... for example:userid field 

sub scripts
{
    ($formname,$required,$password,$emailchk,$chkforword,$selection,$r
+adio,$checkbox) = @_;
    @required = split(/,/,$required);
    @selection = split(/,/,$selection);
    @radio = split(/,/,$radio);
    @checkbox  = split(/,/,$checkbox);
         my    $reqfields = "";
            foreach(@required)
            {
            $reqfields.= "if(valid){chk(document.$formname.$_,\"Please
+ specify value for this field\");}";                
            }
            if($password ne "")
            {
                ($pwd1,$pwd2)=split(/:/,$password);
            
                $password="
                    if(valid){chk(document.$formname.$pwd1,\"Please sp
+ecify your Password\");}
                    if(valid){chk(document.$formname.$pwd2,\"Please co
+nfirm your Password\");}
                    if(valid){
                        if(document.$formname.$pwd1.value == document.
+$formname.$pwd2.value)
                            valid=true;
                           else
                           {
                            alert(\"Please Check your password\");
                            var cp=document.$formname.$pwd2;
                            cp.value=\"\";
                            cp.focus();
                            valid=false;
                        }
                              }";
            
            }
        
            
            if($emailchk ne "")
            {
                @emails = split(/,/,$emailchk);
                
                $emailchk="";
                foreach(@emails)
                {            
                $emailchk.="
                var e=document.$formname.$_;
                if(valid){
                var strS=document.$formname.$_.value;
                var blnB=/^\\w+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]
+{2,3}|[0-9]{1,3})(\\]?)\$\/.test(strS);
                if(blnB) { valid=true;}
                else { alert(\"Please specify valid Email-Id\");valid=
+false;e.focus();}}";
                }            
            }
            if($chkforword ne "")
            {
                $chkforword="
                if(valid){
                    var thischk = document.$formname.$chkforword;
                    var chkW = /^(\\w+[^\\s+])+\$/.test(thischk.value)
+;
                    if(chkW){valid =true;}
                    else{alert(\"Please specify valid value\");valid=f
+alse;thischk.focus();}
             }    
            ";
        }
        
        if($selection[0] ne "")
        {
            $selectfn="
                function chksel(fieldvalue, msg) 
                {
                    if(fieldvalue==\"\")    
                    {
                            alert(msg); valid = false;
                    }
                }
            
            ";
            foreach(@selection)
            {
            $selectchk.="if(valid){chksel(document.$formname.$_.option
+s[document.$formname.$_.selectedIndex].value,\"Please select an optio
+n from the list\");}";            }
        }

        if($radio[0] ne "")
        {
        $radiofn="
            function rdchk(field,msg)
            {
                var exist=0;
                if(field.checked) exist=1;
                for(var i=0;i<field.length;i++){
                if(field[i].checked)
                {
                    exist=1;
                    break;
                 }
                                                         }
                if(exist==0)
                {
                    alert(msg);
                    valid=false;
                }    
            }
            ";
            foreach(@radio)
            {
                $radiochk.= "if(valid){                        
                rdchk(document.$formname.$_,\"Please check one of the 
+options\");}";
            }
        }
        
        if($checkbox[0] ne "")
        {
            $chkfn="
            function chek(field,msg)
            {
                var exist=0;
                for(var i=0;i<field.length;i++){
                if(field[i].checked)
                {
                    exist=1;
                    break;
                 }
                                                         }
                if(exist==0)
                {
                    alert(msg);
                    valid=false;
                }    
            }
            ";
            foreach(@checkbox)
            {
            $checkchk.="if(valid){chek(document.$formname.$_,\"Please 
+check one of the options\");}";
            }
        }
            #print "Require fields: $reqfields";
        print "
        <script language='javascript'>
        var valid=true;
        function validate(frm)
        {
        valid=true;
        $reqfields
        $chkforword
        $password
        $emailchk
        $selectchk
        $radiochk
        $chekchk
        if(valid)
             return(true);    
        else
            return(false);
        }
                
        function chk(fieldvalue, msg) 
        { 
                var thisfield=fieldvalue;
                fieldvalue=fieldvalue.value;
                 re = /\s+/ig;
                 fieldvalue = fieldvalue.replace(re, \"\");     
            if (fieldvalue == \"\")  
             {
               if (valid)  
              { 
                    alert(msg);
                 thisfield.value=\"\";
                 thisfield.focus();
                 valid = false;
                 return(1);
              }  
             }
             else
              {
                  return(1);
              }
        
        } 
        $selectfn
        $radiofn
        $chekfn
</script>";
}

[download]

Example for calling the above subroutine in perl : &scripts("formname","fname,lname","pwd:cpwd","email");

Janitored by Arunbear - added readmore tags, as per Monastery guidelines

In reply to Generate javascript for HTML form fields validation by aartisesha

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.