Fill Date Boxes and Check Date
The first function fills three select boxes with month, day and year to select a date. The finction also checks for leap years and similiar things. The second function checks if the date is a date in the future!
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<body>
<head>
<script language="JavaScript">
function CalculateDays() {
var intMonth = document.dates.expireMonth.value;
var intYear = document.dates.expireYear.value;
var intMaxDay = 31;
var intDay = 1;
var dayHTML = "";
var arrDays = new Array();
if (intMonth != 0 && intYear != 0) {
switch (intMonth) {
case "1":
case "3":
case "5":
case "7":
case "8":
case "10":
case "12":
{
intMaxDay = 31;
}
break;
case "4":
case "6":
case "9":
case "11":
{
intMaxDay = 30;
}
break;
case "2":
{
if (intYear % 4 == 0 && (intYear % 1000 == 0 || intYear % 100 != 0)) {
intMaxDay = 29;
} else {
intMaxDay = 28;
}
}
break;
default:
{
intMaxDay = 31;
}
}
while (document.dates.expireDay.length > 1) {
document.dates.expireDay.options[document.dates.expireDay.length-1] = null;
}
for (intDay=1; intDay<=intMaxDay; intDay++) {
var Eintrag = new Option(intDay);
document.dates.expireDay.options[document.dates.expireDay.length] = Eintrag;
document.dates.expireDay.selectedIndex = intDay;
document.dates.expireDay.options[document.dates.expireDay.selectedIndex].value = intDay;
}
document.dates.expireDay.selectedIndex = 0;
}
}
function IsFutureDate() {
var intMonth = document.dates.expireMonth.value;
var intDay = document.dates.expireDay.value;
var intYear = document.dates.expireYear.value;
var currentDate = new Date();
var currentDay = currentDate.getDate();
var currentMonth = currentDate.getMonth() + 1;
var currentYear = currentDate.getYear();
if (intMonth == 0 || intMonth == null) {
alert("Please select month!");
} else {
if (intDay == 0 || intDay == null) {
alert("Please select day!");
} else {
if (intYear == 0 || intYear == null) {
alert("Please select Year!");
} else {
if (intYear <= currentYear) {
if (intMonth <= currentMonth) {
if (intDay < currentDay) {
alert("Select date in future not in past!");
}
}
}
}
}
}
}
</script>
</head>
<html>
<body>
<form name=dates method=post action="">
<select name="expireMonth" onChange="javascript: CalculateDays();">
<option value="0">Month</option>
<% For intMonth = 1 To 12 %>
<option value="<% = intMonth %>"><% = MonthName(intMonth) %></option>
<% Next %>
</select>
<select name="expireDay">
<option value="0">Day</option>
<% For intDay = 1 To 31 %>
<option value="<% = intDay %>"><% = intDay %></option>
<% Next %>
</select>
<select name="expireYear" onChange="javascript: CalculateDays();">
<option value="0">Year</option>
<% For intYear = Year(Now()) - 1 To Year(Now()) + 9 %>
<option value="<% = intYear %>"><% = intYear %></option>
<% Next %>
</select>
<input type="button" value="Test" onClick="javascript: IsFutureDate();">
</form>
</body>
</html>
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