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ASP Date Picker

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Description : This is an ASP page, which is supposed to be opened in a new browser window, it automatically resizes to a clients resolution, displaying month view with a possibility to pick a date, which is then inserted into a opener page control (like input type text control), whose reference is passed as an argument to this ASP page

<%@ Language=VBScript %>
<%
Option Explicit
Const TOP_COORDINATE = 30
Dim curDate
Dim daysCount
Dim lastDay
Dim firstDay
Dim i
Dim topC
Dim leftC
Dim tempDate
Dim curMonth
Dim curYear
Dim calHTML
Dim pDate
Dim curMonthText
Dim rowCount
Dim nextMonth
Dim prevMonth
Dim retControl
curDate = Request("date")
retControl = Request("ctl")
If IsDate(curDate) Then pDate = FormatDateTime(curDate, 0)
If curDate = "" Then
curDate = Now()
Else
If IsDate(curDate) Then curDate = Month(curDate) & "/" & Day(curDate) & "/" & Year(curDate)
End If
If IsDate(curDate) Then
curMonth = Month(curDate)
curMonthText = TextMonth(curMonth) & "-" & Year(curDate)
curYear = Year(curDate)
firstDay = curMonth & "/" & "01" & "/" & curYear
lastDay = DateAdd("d", -1, DateAdd("m", 1, firstDay))
nextMonth = DateAdd("m", 1, firstDay)
nextMonth = FormatDateTime(Month(nextMonth) & "/" & Day(curDate) & "/" & Year(nextMonth), 0) & _
"&ctl=" & retControl
prevMonth = DateAdd("m", -1, firstDay)
prevMonth = FormatDateTime(Month(prevMonth) & "/" & Day(curDate) & "/" & Year(prevMonth), 0) & _
"&ctl=" & retControl
daysCount = CInt(Day(lastDay))
For i = 1 To daysCount
tempDate = curMonth & "/" & i & "/" & curYear
leftC = calcLeft(DatePart("w", tempDate, vbMonday))
topC = calcTop(tempDate)
calHTML = calHTML & _
"<DIV style='text-align: center; position: absolute; width: 50px; left: " & leftC & "px; top: " & topC & _
"px; font-family: Tahoma, Arial; cursor: hand; "
If FormatDateTime(tempDate, vbShortDate) = FormatDateTime(Now, vbShortDate) Then
calHTML = calHTML & "background-color: orange; color: white"
Else
calHTML = calHTML & "background-color: #faf0e6; color: black"
End If
If FormatDateTime(tempDate, vbShortDate) = FormatDateTime(pDate, vbShortDate) Then
calHTML = calHTML & "; border: solid blue 1px"
End If
calHTML = calHTML & "' onClick=" & Chr(34) & "onDateSelected('" & _
fNumber(Month(tempDate)) & "/" & fNumber(Day(tempDate)) & "/" & Year(tempDate) & _
"')" & Chr(34) & ">" & Day(tempDate) & "</DIV>" & vbCrLf
Next
End If
Function fNumber(fNum)
If Len(CStr(fNum)) < 2 Then
fNumber = "0" & CStr(fNum)
Else
fNumber = fNum
End If
End Function
Function calcLeft(wDay)
calcLeft = ((wDay - 1) * 50) + 2
End Function
Function calcTop(wDate)

Dim mStartDate
Dim mStartWeekDay
Dim dRow
mStartDate = Month(wDate) & "/" & "01/" & Year(wDate)
mStartWeekDay = DatePart("w", mStartDate, vbMonday)
dRow = ((mStartWeekDay + CInt(DateDiff("d", mStartDate, wDate))) 7) + 1
If Weekday(wDate, vbMonday) = 7 Then dRow = dRow - 1
calcTop = ((dRow - 1) * 20) + 1 + TOP_COORDINATE
If dRow > rowCount Then rowCount = dRow
End Function
Function TextMonth(dMonth)
Select Case dMonth
Case 1: TextMonth = "January"
Case 2: TextMonth = "February"
Case 3: TextMonth = "March"
Case 4: TextMonth = "April"
Case 5: TextMonth = "May"
Case 6: TextMonth = "June"
Case 7: TextMonth = "July"
Case 8: TextMonth = "August"
Case 9: TextMonth = "September"
Case 10: TextMonth = "October"
Case 11: TextMonth = "November"
Case 12: TextMonth = "December"
End Select
End Function
%>
<HTML>
<HEAD>
<TITLE>Date picker</TITLE>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
<LINK REL="stylesheet" Type="text/css" HREF="../site_css.css">
<SCRIPT language="JavaScript">
Function onDateSelected(lDate) {
var cObj = eval("opener.window.document." + hostCtl.value);
If (cObj != Null) {
cObj.value = lDate;
cObj.focus();
}
self.window.close();
}window.open
Function initPos() {
curMonth.style.top = (calRows.value * 20) + 30;
window.resizeTo(360, parseInt(curMonth.style.top, 10) + parseInt(curMonth.clientHeight, 10) + 50);
}
</SCRIPT>
</HEAD>
<BODY topmargin="0" leftmargin="0" onLoad="initPos()">
<Input Type="hidden" id="calRows" name="calRows" value="<%=rowCount%>">
<Input Type="hidden" id="hostCtl" name="hostCtl" value="<%=retControl%>">
<DIV style="position: absolute; left: 2px; top: 2px; width: 350px">
<TABLE width="350">
<TR style="background-color: darkblue; color: white">
<TD width="50" align="center"><B>mon</B></TD>
<TD width="50" align="center"><B>tue</B></TD>
<TD width="50" align="center"><B>wed</B></TD>
<TD width="50" align="center"><B>thu</B></TD>
<TD width="50" align="center"><B>fri</B></TD>
<TD width="50" align="center"><B>sat</B></TD>
<TD width="50" align="center"><B>sun</B></TD>
</TR>
</TABLE>
<%=calHTML%>
</DIV>
<DIV id="curMonth" style="position: absolute; left: 2px; width: 350px; text-align: center;">
<TABLE width="350">
<TR style="background-color: black; color: white">
<TD width="100"><A href="calendar.asp?date=<%=prevMonth%>">Previous</A></TD>
<TD align="center" width="150"><B><%=curMonthText%></B></TD>
<TD width="100" align="right"><A href="calendar.asp?date=<%=nextMonth%>">Next</A></TD>
</TR>
</TABLE>
</DIV>
</BODY>
</HTML>
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