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ASP/ VB Form Validation
superjew1


Joined: 22 Jul 2004
Posts: 12
Location: NJ
Post Posted: Thu Jul 22, 2004 6:16 pm Reply with quote
does anyone have a script to validate that some or all of the fields in a form have something filled in them before they can press submit? i know it is a simple script , but for some reason, the one i have doesnt work. Thanks.
Josh
Forum Regular

Joined: 01 Apr 2004
Posts: 1047
Location: Felton, Delaware
Post Posted: Fri Jul 23, 2004 3:59 am Reply with quote
I have a few javascript routines here... have a look and I hope this helps.

Code:

<SCRIPT LANGUAGE="JavaScript">
<!--
   // This file contains the data validation JavaScript functions
   // It is included in the HTML pages with forms that need these
   // data validation routines.


// DEFINE VARIABLES

// whitespace characters
var whitespace = " \t\n\r";



/****************************************************************/

// PURPOSE:  Check to see if the string passed in is a valid time.
//   A valid time is defined as a string which is postfixed with either
//  "PM" or "AM".  Next it checks to see if there is a colon in the
//  string.  If there is, it makes sure that at least one digit preceeds
//  it and two proceed it.

   function IsTime(strTime)
   {
      var strTestTime = new String(strTime);
      strTestTime.toUpperCase();

      var bolTime = false;

      if (strTestTime.indexOf("PM",1) != -1 || strTestTime.indexOf("AM",1))
         bolTime = true;

      if (bolTime && strTestTime.indexOf(":",0) == 0)
         bolTime = false;

      var nColonPlace = strTestTime.indexOf(":",1);
      if (bolTime && ((parseInt(nColonPlace) + 5) < (strTestTime.length - 1) || (parseInt(nColonPlace) + 4) > (strTestTime.length - 1)))
         bolTime = false;


      return bolTime;
   }

/****************************************************************/

function replaceAll (s, fromStr, toStr)
{
   var new_s = s;
   for (i = 0; i < 100 && new_s.indexOf (fromStr) != -1; i++)
   {
      new_s = new_s.replace (fromStr, toStr);
   }
   return new_s;
}

/****************************************************************/

/* PURPOSE:  Since we are using the single tick mark as the
   string delimiter to construct our SQL queries, a string with
   a tick mark in it will cause a SQL error.  Therefore we replace
   all "'" with "''", which eliminates the possibility of a SQL error.
*/

function sqlSafe (s)
{
   var new_s = s;
   new_s = replaceAll (new_s, "'", "|");
   new_s = replaceAll (new_s, "|", "''");
   new_s = replaceAll (new_s, "\"", "|");
   new_s = replaceAll (new_s, "|", "''");
   return new_s;
}

/****************************************************************/

function makeSafe (i)
{
   i.value = sqlSafe (i.value);
}

/****************************************************************/

// Check whether string s is empty.

function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}

/****************************************************************/

// Returns true if string s is empty or
// whitespace characters only.

function isWhitespace (s)

{   var i;

    // Is s empty?
    if (isEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
   // Check that current character isn't whitespace.
   var c = s.charAt(i);

   if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}

/****************************************************************/

// isEmail (STRING s [, BOOLEAN emptyOK])
//
// Email address must be of form a@b.c ... in other words:
// * there must be at least one character before the @
// * there must be at least one character before and after the .
// * the characters @ and . are both required
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.

function isEmail (s)
{   if (isEmpty(s))
       if (isEmail.arguments.length == 1) return defaultEmptyOK;
       else return (isEmail.arguments[1] == true);
   
    // is s whitespace?
    if (isWhitespace(s)) return false;
   
    // there must be >= 1 character before @, so we
    // start looking at character position 1
    // (i.e. second character)
    var i = 1;
    var sLength = s.length;

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}

/****************************************************************/

// Checks to see if a required field is blank.  If it is, a warning
// message is displayed...

function ForceEntry(objField, FieldName)
{
   var strField = new String(objField.value);
   if (isWhitespace(strField)) {
      alert("You need to enter information for " + FieldName);
      objField.focus();
      objField.select();
      return false;
   }

   return true;
}
      
/****************************************************************/

// Returns true if the string passed in is a valid number
//  (no alpha characters), else it displays an error message

function ForceNumber(objField, FieldName)
{
   var strField = new String(objField.value);
   
   if (isWhitespace(strField)) return true;

   var i = 0;

   for (i = 0; i < strField.length; i++)
      if (strField.charAt(i) < '0' || strField.charAt(i) > '9') {
         alert(FieldName + " must be a valid numeric entry.  Please do not use commas or dollar signs or any non-numeric symbols.");
         objField.focus();
         return false;
      }

   return true;
}

/****************************************************************/

// Returns true if the string passed in is a valid money
//  (no alpha characters except a decimal place),
//   else it displays an error message

function ForceMoney(objField, FieldName)
{
   var strField = new String(objField.value);
   
   if (isWhitespace(strField)) return true;

   var i = 0;

   for (i = 0; i < strField.length; i++)
      if ((strField.charAt(i) < '0' || strField.charAt(i) > '9') && (strField.charAt(i) != '.')) {
         alert(FieldName + " must be a valid numeric entry.  Please do not use commas or dollar signs or any non-numeric symbols.");
         objField.focus();
         return false;
      }

   return true;
}


/****************************************************************/

// Right trims the string...  Useful for SQL datatypes of CHAR

function RTrim(strTrim)
{
   var str = new String(strTrim);
   var i = 0;
   var c = "";
   var endpos = 0

   for (i = str.length; i >= 0 && endpos == 0; i = i - 1) {
      c = str.charAt(i);
      if (whitespace.indexOf(c) == -1)
         endpos = i;
   }

   return str.substring(0,endpos+1);
}

/****************************************************************/

/* PURPOSE:  Returns true if the string is a valid date number.
   A method is passed in (1 = month, 2 = day).  If the string is
   nonnumeric, false is passed back.  If the day in the date string
   is greater than 31, false is returned.  If the month is greater
   than 12, an error is returned.
*/

function isDateNumber(strNum,method)
{
   var str = new String(strNum);
   var i = 0;

   if (isNaN(parseInt(str)) || parseInt(str) < 0) return false;

   if (method == 2)
      if (parseInt(str) > 31)
         return false;
   if (method == 1)
      if (parseInt(str) > 12)
         return false;

   for (i = 0; i < str.length; i++)
      if (str.charAt(i) < '0' || str.charAt(i) > '9')
         return false;


   return true;
}

/****************************************************************/

// Displays an alert box with the passed in string...

function PromptErrorMsg(Field,strError)
{
   alert("You have entered an invalid date for " + strError + ".  Please make sure your date format is in M/D/Y format.");
   Field.focus();
}

/****************************************************************/

/* PURPOSE: Checks to see if the string is a valid date.  A valid
   date is defined as any of the following:

      MM/DD/YY, MM/DD/YYYY, M/D/YY, M/D/YYYY,
      MM-DD-YY, MM-DD-YYYY, M-D-YY, M-D-YYYY
*/

function ForceDate(strDate,strField)
{
   var str = new String(strDate.value);

   if (isWhitespace(str)) {
      return true;
      // if the field is empty, just return true...
   }

   var i = 0, count = str.length, j = 0;
   while ((str.charAt(i) != "/" && str.charAt(i) != "-") && i < count)
      i++;

   if (i == count || i > 2) {
      PromptErrorMsg(strDate,strField);
      return false;
   }

   var addOne = false;
   if (i == 2) addOne = true;

   if (!isDateNumber(str.substring(0,i),1)) {
      PromptErrorMsg(strDate,strField);
      return false;
   }

   j = i+1;
   i = 0;

   while ((str.charAt(i+j) != "/" && str.charAt(j+i) != "-") && i+j < count)
      i++;

   if (i+j == count || i > 2) {
      PromptErrorMsg(strDate,strField);
      return false;
   }

   if (!isDateNumber(str.substring(j,i+j),2)) {
      PromptErrorMsg(strDate,strField);
      return false;
   }

   j = i+3;
   i = 0;

   if (addOne) j++;

   while (i+j < count)
      i++;


   if (i != 2 && i != 4) {
      PromptErrorMsg(strDate,strField);
      return false;
   }

   if (!isDateNumber(str.substring(j,i+j),3)) {
      PromptErrorMsg(strDate,strField);
      return false;
   }

   return true;
}

/****************************************************************/

// This function determines if the string passed in is a valid
// US zip code.  It accepts either ##### or #####-####.  If the
// string is valid, it returns true, else false.

function isZipcode(strZip)
{
   var s = new String(strZip);

   if (s.length != 5 && s.length != 10)
      // inappropriate length
      return false;


   for (var i=0; i < s.length; i++)
      if ((s.charAt(i) < '0' || s.charAt(s) > '9') && s.charAt(i) != '-')
         return false;

   return true;
}

/****************************************************************/

// This function ensures that a field is less than or equal to the
// Length passed in.  You must call this function with the element
// name in your form (for example: "ForceLength(document.forms[0].txtElement)"
// as opposed to "ForceLength(document.forms[0].txtElement.value)"
// If the field's value is too large, an error message is displayed
// and false is returned, else true is returned.

function ForceLength(objField, nLength, strWarning)
{
   var strField = new String(objField.value);

   if (strField.length > nLength) {
      alert(strWarning);
      return false;
   } else
      return true;
}

// -->
</SCRIPT>
Chijo


Joined: 23 Jul 2004
Posts: 3
Post Posted: Mon Jul 26, 2004 4:33 am Reply with quote
I want to use just a couple of these 'validator' scripts. I'm using ASPmail. Do I place this script on the .asp script page in the header portion?

thanks,
Chijo
jgothier


Joined: 06 Apr 2004
Posts: 9
Post Posted: Tue Jul 27, 2004 2:01 am Reply with quote
You would put them in the head of your document. Then make them take action when the form submits. Like onSubmit="_init()" on your form tag.

Justin
Josh
Forum Regular

Joined: 01 Apr 2004
Posts: 1047
Location: Felton, Delaware
Post Posted: Tue Jul 27, 2004 11:12 am Reply with quote
Correct Wink
ASP/ VB Form Validation
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