a problem with text field verification

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  • gunawardana
    #1

    a problem with text field verification

    I have to write a program to verify text field in HTML forms.
    So,I hane to verify a text field with lenth 10 & maxlenth 10.The
    entered text should be as follows.
    xxxxxxxxxy
    where xxxxxxxxx denotes a combination of numbers and y should be one
    of 'X','x','V'or 'v'.Also inputs such as 000000000v,0000 00000X are not
    possible.
    Tags: None
    • HikksNotAtHome
      #2
      Re: a problem with text field verification

      In article <6d3c3fa8.03122 22032.5a718dc8@ posting.google. com>, dmag1@mail.com
      (gunawardana) writes:
      [color=blue]
      >I have to write a program to verify text field in HTML forms.
      >So,I hane to verify a text field with lenth 10 & maxlenth 10.The
      >entered text should be as follows.
      > xxxxxxxxxy
      > where xxxxxxxxx denotes a combination of numbers and y should be one
      >of 'X','x','V'or 'v'.Also inputs such as 000000000v,0000 00000X are not
      >possible.[/color]

      Try reading your schoolbook and doing your own homework?
      --
      Randy

        Comment

        • lallous
          #3
          Re: a problem with text field verification

          Hello,

          Validate the string as:

          str="012345678x ";
          var pat = new RegExp(/[0-9]{9}[xv]/i);
          if (pat.exec(str)= =null)
          alert('Invalid input!');

          --
          Elias

          "gunawardan a" <dmag1@mail.com > wrote in message
          news:6d3c3fa8.0 312222032.5a718 dc8@posting.goo gle.com...[color=blue]
          > I have to write a program to verify text field in HTML forms.
          > So,I hane to verify a text field with lenth 10 & maxlenth 10.The
          > entered text should be as follows.
          > xxxxxxxxxy
          > where xxxxxxxxx denotes a combination of numbers and y should be one
          > of 'X','x','V'or 'v'.Also inputs such as 000000000v,0000 00000X are not
          > possible.[/color]


            Comment

            • McKirahan
              #4
              Re: a problem with text field verification

              "gunawardan a" <dmag1@mail.com > wrote in message
              news:6d3c3fa8.0 312222032.5a718 dc8@posting.goo gle.com...[color=blue]
              > I have to write a program to verify text field in HTML forms.
              > So,I hane to verify a text field with lenth 10 & maxlenth 10.The
              > entered text should be as follows.
              > xxxxxxxxxy
              > where xxxxxxxxx denotes a combination of numbers and y should be one
              > of 'X','x','V'or 'v'.Also inputs such as 000000000v,0000 00000X are not
              > possible.[/color]


              I'm sure there's a Regular expression that does what you want with less
              coding but here's one solution; watch for word-wrap.


              <html>
              <head>
              <title>gunaward ana.htm</title>
              <script language="javas cript" type="text/javascript">
              <!--
              function check() {
              var form = document.forms[0];
              var data = form.Data.value ;
              if (data.length != 10) return;
              if (data.substr(0, 9) == "000000000" ) return;
              for (var i=0; i<9; i++) {
              if (data.charAt(i) < "0" || data.charAt(i) > "9") return;
              }
              if ("XxVv".indexOf (data.charAt(9) ) < 0) return;
              alert("OK!");
              }
              //-->
              </script>
              </head>
              <body>
              <form>
              <input type="text" name="Data" size="10" maxlength="10">
              <input type="button" value="Check" onclick="check( )">
              </form>
              </body>
              </html>


                Comment

                • Dr John Stockton
                  #5
                  Re: a problem with text field verification

                  JRS: In article <6d3c3fa8.03122 22032.5a718dc8@ posting.google. com>, seen
                  in news:comp.lang. javascript, gunawardana <dmag1@mail.com > posted at
                  Mon, 22 Dec 2003 20:32:27 :-[color=blue]
                  >I have to write a program to verify text field in HTML forms.
                  >So,I hane to verify a text field with lenth 10 & maxlenth 10.The
                  >entered text should be as follows.
                  > xxxxxxxxxy
                  > where xxxxxxxxx denotes a combination of numbers and y should be one
                  >of 'X','x','V'or 'v'.Also inputs such as 000000000v,0000 00000X are not
                  >possible.[/color]

                  But what do you mean by "such as"? With leading zero? With all zeroes?

                  There is an "or" facility in a RegExp, but not AFAIK an equivalent
                  "and".

                  Don't use a RegExp; use two, the second to deal with whatever "such as"
                  means.

                  OK = /^\d{9}(v|x)$/i.test(S) && /[1-9]/.test(S) // not 000000000
                  OK = /^\[1-9]d{8}(v|x)$/i.test(S) // not leading zero

                  See in <URL:http://www.merlyn.demo n.co.uk/js-valid.htm>.

                  --
                  © John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
                  <URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang. javascript
                  <URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
                  <URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

                    Comment

                    • Lasse Reichstein Nielsen
                      #6
                      Re: a problem with text field verification

                      Dr John Stockton <spam@merlyn.de mon.co.uk> writes:
                      [color=blue]
                      > There is an "or" facility in a RegExp, but not AFAIK an equivalent
                      > "and".[/color]

                      Not directly. There could be, since there is nothing in the technology
                      used that prohibits and "and" (and regular languages are closed under
                      intersection).
                      The closest you get is positive lookahead, i.e., to match five digits
                      and at least one 4, you can write
                      /^(?=\d{5})\d*4\ d*$/
                      [color=blue]
                      > Don't use a RegExp; use two,[/color]

                      Agreed. Often, a very complex regular expressin can be written as
                      two simple ones.

                      Example: String contains n "a"'s and m "b"'s:

                      Two regexps:
                      /^[^a]*(a[^a]*){n}$/
                      /^[^b]*(b[^b]*){m}$/

                      I won't even begin to write a regexp for n and m with values much over 2.
                      Try :)

                      /L
                      --
                      Lasse Reichstein Nielsen - lrn@hotpop.com
                      DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
                      'Faith without judgement merely degrades the spirit divine.'

                        Comment

                        • Eric Bohlman
                          #7
                          Re: a problem with text field verification

                          Lasse Reichstein Nielsen <lrn@hotpop.com > wrote in
                          news:1xqvyoxp.f sf@hotpop.com:
                          [color=blue]
                          > Dr John Stockton <spam@merlyn.de mon.co.uk> writes:
                          >[color=green]
                          >> There is an "or" facility in a RegExp, but not AFAIK an equivalent
                          >> "and".[/color]
                          >
                          > Not directly. There could be, since there is nothing in the technology
                          > used that prohibits and "and" (and regular languages are closed under
                          > intersection).
                          > The closest you get is positive lookahead, i.e., to match five digits
                          > and at least one 4, you can write
                          > /^(?=\d{5})\d*4\ d*$/[/color]

                          Actually you can use positive lookahead to implement an arbitrary "and":
                          /^(?=.*this)(?=. *that)/ (a trick introduced in the _Perl Cookbook_ and
                          implemented in a Perl module of mine).

                          However, doing two separate tests will usually be more efficient and the
                          lookahead trick should probably be used only when the match parameters
                          aren't known until runtime.

                            Comment

                            • Lasse Reichstein Nielsen
                              #8
                              Re: a problem with text field verification

                              Eric Bohlman <ebohlman@earth link.net> writes:
                              [color=blue]
                              > Actually you can use positive lookahead to implement an arbitrary "and":
                              > /^(?=.*this)(?=. *that)/ (a trick introduced in the _Perl Cookbook_ and
                              > implemented in a Perl module of mine).[/color]

                              The problem is that you can only do this efficiently at the end of a string.
                              Compare this for "or':
                              /z(aa|bbb)cd/
                              If we had the hypothetical & operator, and wrote
                              /z(.*this.*&.*th at.*)cd/
                              then we wanted the part between "z" and "cd" to contain both "this"
                              and "that".

                              If you do that with lookahead, you need to be able to bound the search
                              somehow, or the lookahead can test past the cd. As your example:
                              /z(?=.*this)(.*t hat.*)cd/
                              would incorrectly match
                              "z that cd this"

                              You need to ensure that the lookahead is only tested against the same
                              string as the other argument to "and".


                              You can do "the trick" and duplicate the continuation:
                              /z(?=.*this.*cd) (.*that.*cd)/
                              but even that can be broken by using more complex expressions. Take
                              "all digits, and at least three 4's":

                              /z(\d*&(.*4){3}. *)cd/
                              Doing the trick here gives
                              /z(?=\d*cd)(.*4) {3}.*cd/
                              However, that also matches
                              "z111cd444c d"

                              Again, you have to build your RegExps so the lookahead is bounded,
                              something that was not necessary with the hypothetical "&" operator.


                              /L
                              --
                              Lasse Reichstein Nielsen - lrn@hotpop.com
                              DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
                              'Faith without judgement merely degrades the spirit divine.'

                                Comment

                                • Thomas 'PointedEars' Lahn
                                  #9
                                  Re: a problem with text field verification

                                  lallous wrote:
                                  [color=blue]
                                  > str="012345678x ";
                                  > var pat = new RegExp(/[0-9]{9}[xv]/i);[/color]

                                  No. Either

                                  var pat = /\d{9}[xv]/i;

                                  or

                                  var pat = new RegExp("\\d{9}[xv]", "i");
                                  [color=blue]
                                  > if (pat.exec(str)= =null)[/color]

                                  if (! pat.test(str))
                                  [color=blue]
                                  > alert('Invalid input!');
                                  >
                                  > [Top post][/color]

                                  Please do not do this, you are wasting
                                  scarce and thus precious resources.


                                  PointedEars

                                    Comment

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