by David Koopman (11 Submissions)
Category: Internet/HTML
Compatability: VB Script
Difficulty: Unknown Difficulty
Originally Published: Fri 14th February 2003
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
This code validates dates from dynamically created dropdown boxes in ASP. Validation is done using javascript.
VBcoders
<HTML>
<HEAD>
<SCRIPT LANGUAGE=javascript>
<!--
function dateCheck(m, d, y)
{
// If nothing is selected the database will enter a Null value
if(m.value != ''){
//Check for months with only 30 days
if(m.value == "4" || m.value == "6" || m.value == "9" || m.value == "11"){
if(d.value == "31"){
alert("There are only 30 days\nin this month")
d.focus();
return false;
}
}
if(m.value == "2"){ //Month of February
if(parseInt(y.value)%4 != 0 && d.value == "29"){ // If the year is divisible by 4 then it is a leap year
alert("There are only 28 days in the month \nof February unless it is a leap year.")
d.focus();
return false;
}
else if(d.value == 30 || d.value == 31){ // There are never more than 29 days in February
alert("There are never more than 29 days\nin the month of February")
d.focus();
return false;
}
}
return true;
}
}
function checkAllDates()
{
// Do multiple checks if there is more than one date to evaluate
if(!dateCheck(document.frmView.cmbDCM, document.frmView.cmbDCD, document.frmView.cmbDCY)){
}
else if(!dateCheck(document.frmView.cmbTSM, document.frmView.cmbTSD, document.frmView.cmbTSY)){
}
else
{alert("All dates are valid!")}
}
//-->
</SCRIPT>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
<TITLE></TITLE>
</HEAD>
<BODY>
<FORM name=frmView id=frmView>
<CENTER><H2>Date Validation</H2>
<TABLE>
<TR>
<TD>Dev. Complete Date:</TD>
<TD>
<SELECT id=cmbDCM name=cmbDCM>
<OPTION value="" selected>-- MONTH --</OPTION>
<%For i = 1 To 12%>
<OPTION value="<%=i%>"><%=i%></OPTION>
<%Next%>
</SELECT>
<SELECT id=cmbDCD name=cmbDCD>
<OPTION value="" selected>-- DAY --</OPTION>
<%For j = 1 To 31%>
<OPTION value="<%=j%>"><%=j%></OPTION>
<%Next%>
</SELECT>
<SELECT id=cmbDCY name=cmbDCY>
<OPTION value="" selected>-- YEAR --</OPTION>
<%For y = CDbl(Datepart("yyyy", Date())) To CDbl(Datepart("yyyy", Date()) + 5)%>
<OPTION value="<%=y%>"><%=y%></OPTION>
<%Next%>
</SELECT>
</TD>
</TR>
<TR>
<TD>Test Start Date:</TD>
<TD>
<SELECT id=cmbTSM name=cmbTSM>
<OPTION value="" selected>-- MONTH --</OPTION>
<%For i = 1 To 12%>
<OPTION value="<%=i%>"><%=i%></OPTION>
<%Next%>
</SELECT>
<SELECT id=cmbTSD name=cmbTSD>
<OPTION value="" selected>-- DAY --</OPTION>
<%For j = 1 To 31%>
<OPTION value="<%=j%>"><%=j%></OPTION>
<%Next%>
</SELECT>
<SELECT id=cmbTSY name=cmbTSY>
<OPTION value="" selected>-- YEAR --</OPTION>
<%For y = CDbl(Datepart("yyyy", Date())) To CDbl(Datepart("yyyy", Date()) + 5)%>
<OPTION value="<%=y%>"><%=y%></OPTION>
<%Next%>
</SELECT>
</TD>
</TR>
</TABLE><BR>
<INPUT type="button" value="Check Dates" id=button1 name=button1 onClick="return checkAllDates()">
</FORM>
</BODY>
</HTML>
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