[Zope] Validating data entry (dates)

[Jim Sanford]

HERE IS SOME JAVASCRIPT I USE TO VALIDATE DATES ON THE CLIENT SIDE


function JValiDate(dateStr){
 if (dateStr.length==0){
   dateStr='99/99/9999';
 }
 else if (dateStr.charAt(0)==' '){
   dateStr='99/99/9999';
 }
  while (dateStr.charAt(dateStr.length-1)==' ') dateStr=dateStr.substring(0,dateStr.length-1);
  var dtmp='';
  var z=''
  for (var x=0; x < dateStr.length; x++) {
    z=dateStr.charAt(x);
    if (z>=0 && z<=9) {
      dtmp+=z;
    }
    else dtmp+='/';
  }
  if (dtmp.charAt(1)=='/') dtmp='0'+dtmp;
  if (dtmp.charAt(4)=='/') dtmp=dtmp.substring(0,3)+'0'+dtmp.substring(3,dtmp.length);
  // alert ('>'+dtmp+'<');
  // alert (dtmp.length);
  if (dtmp.length==8){
    tyear=dtmp.substring(6,8);
    // alert(tyear)
    if (tyear<31) {
      dtmp=dtmp.substring(0,6)+'20'+tyear
    }
    else {
      dtmp=dtmp.substring(0,6)+'19'+tyear;
    }
  }
  var a=dtmp
  var err=0 
  var psj=0; 
  if (a.length != 10) err=1 
  var b = a.substring(0, 2)// month 
  var c = a.substring(2, 3)// '/' 
  var d = a.substring(3, 5)// day 
  var e = a.substring(5, 6)// '/' 
  var f = a.substring(6, 10)// year 
  // basic error checking 
  if (b<1 || b>12) err = 1 
  if (c != '/') err = 1 
  if (d<1 || d>31) err = 1 
  if (e != '/') err = 1 
  if (f<1900 || f>2099) err = 1 
  // advanced error checking 
  // months with 30 days 
  if (b==4 || b==6 || b==9 || b==11){ 
    if (d==31) err=1 
  } 
  // february, leap year 
  if (b==2){ 
    // feb 
    var g=parseInt(f/4) 
    if (isNaN(g)) { 
      err=1 
    } 
    if (d>29) err=1 
    if (d==29 && ((f/4)!=parseInt(f/4))) err=1 
  } 
  if (err==1){
    if (dateStr!='99/99/9999'){
      alert('Date '+dtmp+' is not valid!'); 
    }
    return ''
  }
  else {
    return dtmp;
  }
}


HERE IS EXAMPLE OF USE

<input type="text" name="wpodate" size="9" maxlength="10" 
value="<dtml-var "podate.toZone('US/Central').strftime('%m-%d-%Y')">"
 onChange="this.value=JValiDate(this.value)">

 __________________________________________________________________
 
              Jim Sanford
      .       Database Engineer
     / \  /   Accelerated Technology, Inc.
    /   /     720 Oak Circle Drive East
   /  /  \    Mobile, AL 36609
  / /     \   Voice: 334-661-5770  fax: 334-661-5788
 /         \  E-Mail: jsanford@atinucleus.com
              Web: http://www.atinucleus.com
  
 Source Code, No Royalties, Any CPU...It just make sense !
 __________________________________________________________________



----- Original Message ----- 
From: Henny van der Linde <linde@inline-info.nl>
To: Zope mailing list <zope@zope.org>
Sent: Wednesday, December 08, 1999 5:13 PM
Subject: [Zope] Validating data entry (dates)


Hi,

Is there an elegant way to validate fields in a form before submitting.

For example:

I have a date field. I want to check, before submitting the form, if the
date entered is valid.
Is there someting like a function as: Date.IsValid (I haven a Delphi
background). What I don't want is a Zope generated standard error screen. I
want a custom designed error message/page.

thanks,

Henny van der Linde







_______________________________________________
Zope maillist  -  Zope@zope.org
http://lists.zope.org/mailman/listinfo/zope
          No cross posts or HTML encoding!
(Related lists - 
 http://lists.zope.org/mailman/listinfo/zope-announce
 http://lists.zope.org/mailman/listinfo/zope-dev )