general.js

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function SetFocus(TargetFormName) {
  var target = 0;
  if (TargetFormName != "")
    for (i=0; i<document.forms.length; i++) {
      if (document.forms[i].name == TargetFormName) {
        target=i;
        break;
      }
    }

  var TargetForm = document.forms[target];
    
  for (i=0; i<TargetForm.length; i++) {
    if ( (TargetForm.elements[i].type != "image") && 
         (TargetForm.elements[i].type != "hidden") && 
         (TargetForm.elements[i].type != "reset") && 
         (TargetForm.elements[i].type != "submit") ) {

      TargetForm.elements[i].focus();

      if ( (TargetForm.elements[i].type == "text") || 
           (TargetForm.elements[i].type == "password") )
        TargetForm.elements[i].select();
      
      break;
    }
  }
}

function RemoveFormatString(TargetElement, FormatString) {
  if (TargetElement.value == FormatString)
    TargetElement.value = "";
    TargetElement.select();
}

function CheckDateRange(from, to) {
  if (Date.parse(from.value) <= Date.parse(to.value))
    return true;
  else
    return false;
}

function IsValidDate(DateToCheck, FormatString) {
  var strDateToCheck;
  var strDateToCheckArray;
  var strFormatArray;
  var strFormatString;
  var strDay;
  var strMonth;
  var strYear;
  var intday;
  var intMonth;
  var intYear;
  var intDateSeparatorIdx = -1;
  var intFormatSeparatorIdx = -1;
  var strSeparatorArray = new Array("-"," ","/",".");
  var strMonthArray = new Array("jan","feb","mar","apr","may","jun","jul","8月","sep","oct","nov","dec");
  var intDaysArray = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

  strDateToCheck = DateToCheck.toLowerCase();
  strFormatString = FormatString.toLowerCase();
  
  if (strDateToCheck.length != strFormatString.length) {
    return false;
  }

  for (i = 0; i < strSeparatorArray.length; i++) {
    if (strFormatString.indexOf(strSeparatorArray[i]) != -1) {
      intFormatSeparatorIdx = i;
      break;
    }
  }

  for (i = 0; i < strSeparatorArray.length; i++) {
    if (strDateToCheck.indexOf(strSeparatorArray[i]) != -1) {
      intDateSeparatorIdx = i;
      break;
    }
  }
  
  if (intDateSeparatorIdx != intFormatSeparatorIdx)
    return false;

  if (intDateSeparatorIdx != -1) {
    strFormatArray = strFormatString.split(strSeparatorArray[intFormatSeparatorIdx]);
    if (strFormatArray.length != 3) {
      return false;
    }

    strDateToCheckArray = strDateToCheck.split(strSeparatorArray[intDateSeparatorIdx]);
    if (strDateToCheckArray.length != 3) {
      return false;
    }

    for (i = 0; i < strFormatArray.length; i++) {
      if (strFormatArray[i] == 'mm' || strFormatArray[i] == 'mmm')
        strMonth = strDateToCheckArray[i];
      if (strFormatArray[i] == 'dd')
        strDay = strDateToCheckArray[i];
      if (strFormatArray[i] == 'yyyy')
        strYear = strDateToCheckArray[i];
    }
  }
  else {
    if (FormatString.length>7) {
      if (strFormatString.indexOf('mmm') == -1)
        strMonth = strDateToCheck.substring( strFormatString.indexOf('mm'), 2 );
      else
        strMonth = strDateToCheck.substring( strFormatString.indexOf('mmm'), 3 );
      strDay = strDateToCheck.substring( strFormatString.indexOf('dd'), 2 );
      strYear = strDateToCheck.substring( strFormatString.indexOf('yyyy'), 2 );
    }
    else {
      return false;
    }
  }

  if (strYear.length != 4) {
    return false;
  }
  intday = parseInt(strDay, 10);
  if (isNaN(intday)) {
    return false;
  }
  if (intday < 1) {
    return false;
  }

  intMonth = parseInt(strMonth, 10);
  if (isNaN(intMonth)) {
    for (i = 0;i < strMonthArray.length; i++) {
      if (strMonth == strMonthArray[i]) {
        intMonth = i+1;
        break;
      }
    }
    if (isNaN(intMonth)) {
      return false;
    }
  }
  if (intMonth>12 || intMonth<1) {
    return false;
  }

  intYear = parseInt(strYear, 10);
  if (isNaN(intYear)) {
    return false;
  }
  if (IsLeapYear(intYear) == true) {
    intDaysArray[1] = 29;
  }

  if (intday > intDaysArray[intMonth - 1]) {
    return false;
  }
  
  return true;
}

function IsLeapYear(intYear) {
  if (intYear % 100 == 0) {
    if (intYear % 400 == 0)
      return true;
  }
  else {
    if ((intYear % 4) == 0)
      return true;
  }

  return false;
}