Validation
Controls
RequiredFieldValidator
The
RequiredFieldValidator control ensures that the user does not skip an entry.
The control fails validation if the value it contains does not change from its
initial value when validation is performed. If all the fields in the page are
valid, the page is valid.
|
<form
id="form1" runat="server">
<div
style="text-align: left">
First
Name: <asp:TextBox ID="txtFirstname"
runat="server"></asp:TextBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txtFirstname"
ErrorMessage="You no feed the Name !">
</asp:RequiredFieldValidator>
<br />
Last Name:<asp:TextBox
ID="txtLastname" runat="server"
Wrap="False"></asp:TextBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator2" runat="server"
ControlToValidate="txtLastname"
ErrorMessage="You no feed the Last Name !">
</asp:RequiredFieldValidator>
<br />
<br />
<asp:Button ID="BtnSubmit"
runat="server" Text="Submit"
onclick="BtnSubmit_Click" />
<br />
<br />
<asp:Label ID="lblSucceed"
runat="server"></asp:Label>
</div>
</form>
|
|
protected void
BtnSubmit_Click(object sender, EventArgs e)
{
lblSucceed.Text = "You key
already fully.";
}
|
RangeValidator
Control
The RangeValidator
control tests whether an input value falls within a given range. RangeValidator
uses three key properties to perform its validation: ControlToValidate contains
the value to validate, MinimumValue defines the minimum value of the valid
range, and MaximumValue defines the maximum value of the valid range. These
constants are stored as string values, but are converted to the data type
defined by Type when the comparison is performed
<form id =
"form1" runat = "server">
<div>
My age is:
<asp:TextBox ID =
"txtAge" runat = "server" MaxLength = "3" />
<asp:RangeValidator ID =
"RangeValidator1" runat = "server" ControlToValidate =
"txtAge" Type = "Integer"
ErrorMessage = "you
must add age since , 25 arrive at 35 year." MaximumValue = "35" MinimumValue
= 30">
</asp:RangeValidator>
</div>
</form>
RegularExpressionValidator
Control
The
RegularExpressionValidator control confirms that the entry matches a pattern
defined by a regular expression. This type of validation allows you to check
for predictable sequences of characters, such as those in social security
numbers, e-mail addresses, telephone numbers, postal codes, and so on.
|
<form
id="form1" runat="server">
<div>
Your Email :<asp:TextBox
ID="txtEmail" runat="server" />
<asp:RegularExpressionValidator
ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtEmail"ErrorMessage="you
add the email dishonestly !"
ValidationExpression="[\w]+@[\w]+\.(com|net|org|co\.th|go\.th|ac\.th|or\.th|go.\th)">
</asp:RegularExpressionValidator>
<br
/><br /><br />
Enter a 5 digit zip code: <asp:TextBox ID="txtCode"
runat="server" />
<asp:RegularExpressionValidator
ID="RegularExpressionValidator3" runat="server"
ControlToValidate="txtCode" ErrorMessage="you put on a code the
post dishonestly !" ValidationExpression="\d{5}">
</asp:RegularExpressionValidator>
<br />
<asp:Button
ID="btnOK" runat="server" Text="Submit"
onclick="btnOK_Click" />
<br />
<asp:Label
ID="lblSum"
runat="server"></asp:Label></div>
</form>
|
|
protected void
btnOK_Click(object sender, EventArgs e)
{
lblSum.Text = "you key to are
correct.";
}
|
CompareValidator
CompareValidator
uses three key properties to perform its validation. ControlToValidate and
ControlToCompare contain the values to compare
|
<form id =
"form1" runat = "server">
<div
style="text-align: left">
<p>fix
the password that want.<br/>
<asp:TextBox
ID = "txtConfig" runat = "server" TextMode =
"Password" />
</p>
<p>confirm
the password.<br/>
<asp:TextBox
ID = "txtConfirm" runat = "server" TextMode =
"Password" />
<asp:CompareValidator ID =
"CompareValidator1" runat = "server"
ErrorMessage = "the password
disagrees !" ControlToValidate = "txtConfirm"
ControlToCompare =
"txtConfig"></asp:CompareValidator>
</p>
<p><asp:Button
ID = "btnOK" OnClick = "btnOK_Click" runat =
"server" Text = "Submit" /></p>
<p><asp:Label
ID = "lblSum" Text = "" runat = "server"
/></p>
</div>
</form>
|
|
protected void btnOK_Click(object sender,
EventArgs e)
{
lblSum.Text = "the password is correct.";
}
|
CustomValidator
Control
The
CustomValidator control calls a user-defined function to perform validations
that the standard validators can't handle. The custom function can execute on
the server or in client-side script, such as JScript or VBScript. For
client-side custom validation, the name of the custom function must be
identified in the ClientValidationFunction property.
|
<head
runat="server">
<title>How to Use
CustomValidator</title>
<script
language = "JavaScript" type = "text/javascript">
function
validateNumber(value, arg) {
arg.IsValid
= (arg.Value%5 == 0);
}
</script>
</head>
<body>
<form id =
"form1" runat = "server">
<div>
<p>the
number that divide by 5 divisibl :
<asp:TextBox
ID = "txtDigit" runat = "server" />
<asp:CustomValidator
ID = "CustomValidator1" runat = "server"
ControlToValidate ="txtDigit"
ErrorMessage = "must add the number that divide by 5 divisible
only."
ClientValidationFunction = "validateNumber">
</asp:CustomValidator>
</p>
<p><asp:Button
ID = "btnOK" OnClick = "btnOK_Click" runat =
"server" Text = "Submit" /></p>
<p><asp:Label
ID = "lblSum" runat = "server" /></p>
</div>
</form>
</body>
|
|
protected void btnOK_Click(object sender,
EventArgs e)
{
if (Page.IsValid)
{
lblSum.Text = "you add the
number is correct.";
}
}
|
ValidationSummary
Control
A
ValidationSummary control is displayed when the IsValid property of the page is
false. It "polls" each of the validation controls on the page and
aggregates the text messages exposed by each. The following sample illustrates
displaying errors with a ValidationSummary.
<asp:ValidationSummary
ID = "ValidationSummary1" runat = "server" HeaderText = "the all error that meet to
is : ">
</asp:ValidationSummary>
No comments:
Post a Comment