// validate.js		© Copyright of Teamsoft 1998-2003. All rights Reserved.
// The following functions work on strings and doesn't give error messages.
function notDigits(numString) {
     for (var i = 0; i < numString.length; i++) {
          var ch = numString.charAt(i);
          if (ch < "0") return true;
          if (ch > "9") return true;
     } // end for
     return false;
} // end function
function badDate(dateString) { // checks if date field is valid
     var ymd = dateString.split("-")
     if (ymd.length != 3) return true
     if (ymd[0].length !=4) return true
     if (ymd[1].length != 2) return true
     if (ymd[2].length != 2) return true
     for (var i = 0; i < 3; i++) {
          if (notDigits(ymd[i])) return true
     } // end for
     return false
} // end function
// The following functions work on fields and gives error messages
function emptyField(field, name) { // cheks if mandatory field is empty
     var val = field.value
     if (val == "" || val.search(/\w/) == -1) {
          alert("Indtast venligst " + name)
          field.focus()
          return true
     } // end if
     return false
} // end function
function emptySelect(field, name) { // cheks if value is selected from drop-down
     if (field.options[0].selected) {
          alert("Vælg venligst en " + name + " fra listen")
          field.focus()
          return true
     } // end if
     return false
} // end function
function emptyYesNo(field, name) { // cheks if value is selected from drop-down
     if (field[0].checked || field[1].checked) return false
     alert("Please reply Yes or No to question about " + name)
     field[0].focus()
     return true
} // end function
function badDateField(field, name, years) {
     if (emptyField(field, name)) return true
     // check format of date
     var dateString = field.value
     if (badDate(dateString)) {
          alert('The date "' + dateString + '" does not have the format "yyyy-mm-dd" (in ' + name + ')')
          field.focus()
          return true
     } // end if
     // check validity of date
     var ymd = dateString.split("-")
     var year = Number(ymd[0])
     var month = Number(ymd[1]) -1
     var day = Number(ymd[2])
     var dateValue = new Date(year, month, day)
     //   alert("Year=" + dateValue.getFullYear() + ", Month=" + dateValue.getMonth() + ", Day=" + dateValue.getDate())
     if (year != dateValue.getFullYear() || month != dateValue.getMonth() || day != dateValue.getDate()) {
          alert('The date "' + dateString + '" is not a valid date (in ' + name + ')')
          field.focus()
          return true
     } // end if
     // check max date
     var max = new Date()
     max.setFullYear(max.getFullYear() - years)
     if (dateValue > max) {
          alert('A date after "' + String(max.getFullYear()) + '-' + String(max.getMonth() + 1) + "-" + String(max.getDate()) + '" is not allowed (in ' + name + ')')
          field.focus()
          return true
     } // end if
} // end function