validate 3 textfields representing date of birth
Question
I have 3 text box fields. to represent a date
eg DD MM YYYY
how can i validate only correct data is entered into each text box. is it a regexpression??
i need to do this inside the ascx/aspx file rather than the .cs codebehind
thanks
7 answers
solution1
5 ACCPTED 2009-08-03 14:59:45
You could validate each field with regexes, but it wouldn't take into account different months with different numbers of days: you could enter invalid dates.
On the server side it could be validated with something like this:
DateTime D;
string CombinedDate=String.Format("{0}-{1}-{2}", YearField.Text, MonthField.Text, DayField.Text);
if(DateTime.TryParseExact(CombinedDate, "yyyy-M-d", DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out D)) {
// valid
} else {
// not valid
}
solution2
0 2009-08-03 14:57:15
You should use CustomValidator to validate your result input of all 3 controls. Maybe inside that custom validation script you can use regex to validate data.
solution3
0 2009-08-03 15:01:00
Try putting them in to a DateTime objects.
int day, month, year;
if (Int32.TryParse(dayInput.Value, out day)) {
if (Int32.TryParse(monthInput.Value, out month)) {
if (Int32.TryParse(yearInput.Value, out year)) {
DateTime birthDate = new DateTime(year, month, day);
if ([birthDate is in valid range])
// it passes
}
}
}
I know this isn't very elegant, but you can also test it the same way using the following RegEx
[0-9]+
However I like my way because I can enter it in to a DateTime field and then test the range to make sure it doesn't exceed the current date and is not below a 100 years before the current date.
solution4
0 2009-08-03 15:30:37
Wouldn't validation in the aspx file introduce logic code in the presentation layer?
I would suggest an AJAX control (there is an AJAX MaskEdit box - alike). They usually okay for these sort of things, look into the AJAX toolkit, if the server you're deploying can support those.
solution5
0 2009-08-03 15:32:27
Full example:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="Web_Layer.WebForm2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<script runat="server">
protected void ValidateDate(object sender, EventArgs e)
{
int day=0;
int month=0;
int year=0;
if (!int.TryParse(txtDD.Text, out day))
day = 0;
if (!int.TryParse(txtMM.Text, out month))
month = 0;
if (!int.TryParse(txtYY.Text, out year))
year = 0;
if (((year > 0)) && ((month > 0) && (month < 13)) && ((day > 0) && (day <= DateTime.DaysInMonth(year, month))))
{
lblValid.Text = "Valid!";
}
else
{
lblValid.Text = "NOT Valid!";
}
}
</script>
<asp:TextBox ID="txtDD" runat="server"></asp:TextBox>
<asp:TextBox ID="txtMM" runat="server"></asp:TextBox>
<asp:TextBox ID="txtYY" runat="server"></asp:TextBox>
<asp:Button ID="btn" runat="server" OnClick="ValidateDate"/>
<asp:Label ID="lblValid" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
solution6
0 2009-08-03 15:41:20
那如何使用下拉菜单呢？
solution7
0 2009-08-03 15:55:39
public bool isValidDate(string datePart, string monthPart, string yearPart)
{
DateTime date;
string strDate = string.Format("{0}-{1}-{2}", datePart, monthPart, yearPart);
if (DateTime.TryParseExact(strDate, "dd-MM-yyyy", System.Globalization.DateTimeFormatInfo.InvariantInfo , System.Globalization.DateTimeStyles.None, out date ))
{
return true;
}
else
{
return false ;
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.