Validations for CheckBox in asp.net
If we have some options but we
have needed one of them or select one of them then we can use checkbox control.
Let’s have a brief idea on working of checkbox control.
CustomValidator on CheckBox
Let me tell you for your
information RequiredFieldValidator
doesn't works with CheckBox control. So to accomplish this purpose we can use
CustomValidator to validate checkbox
control.
At client side
Here I have validated
CheckBox control as must be checked
CheckBox control before going farther
process using javascript function ‘ValidateCheckBox’.
.aspx Code:
|
// ValidateCheckBox function check CheckBox control Checked or UnChecked
<script
type =
"text/javascript">
function ValidateCheckBox(sender, args) {
if (document.getElementById("<%=cbxIAgree.ClientID
%>").checked
== true) {
args.IsValid = true;
} else {
args.IsValid = false;
}
}
</script>
//asp CheckBox control
<asp:CheckBox ID
="cbxIAgree" runat="server" Text="I Agree" AutoPostBack="true"
/>
//asp custom validator witch call ValidationCheckBox javascript function
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="You must checked I Agree to continue."
ClientValidationFunction
= "ValidateCheckBox"></asp:CustomValidator>
|
At server side
If browser’s JavaScript disable,
in this case above example use at server side
.aspx Code:
|
//asp CheckBox control
<asp:CheckBox
ID ="cbxIAgree"
runat="server"
Text="I Agree"
AutoPostBack="true"/>
//asp custom validator witch call ValidationCheckBox javascript function
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="You must checked 'I Agree' to continue."
OnServerValidate="CheckBox"></asp:CustomValidator>
|
.cs Code:
|
//CheckBox function call by CustomValidator’s event OnServerValidate
public
void CheckBox(object
o, ServerValidateEventArgs e)
{
if (cbxIAgree.Checked)
e.IsValid = true;
else
e.IsValid = false;
}
|
Validations for CheckBoxList in asp.net
The
CheckBoxList control is used to
create a multi-selection check box group. Each selectable item in a
CheckBoxList control is defined by a
ListItem element!
CustomValidator on CheckBoxList
You might know that
RequiredFieldValidator doesn't works
with CheckBoxList control. So to accomplish that purpose we can use
CustomValidator to validate
CheckBoxList.
At client side
Here I have validated
CheckBoxList control as must be
checked CheckBoxList control before
going farther process using JavaScript function.
.aspx Code:
|
// ValidationCheckBoxList function, that check CheckBoxList checked or not
<script
type="text/javascript">
function ValidateCheckBoxList(source, args) {
var chkListQualification =
document.getElementById('<%=
CheckBoxList1.ClientID
%>');
var chkListinputs =
chkListQualification.getElementsByTagName("input");
for (var
i = 0; i < chkListinputs.length; i++) {
if (chkListinputs[i].checked) {
args.IsValid = true;
return;
}
}
args.IsValid = false;
}
</script>
// asp CustomValidator
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Please select at least one qualification"
ClientValidationFunction="ValidateCheckBoxList"></asp:CustomValidator>
|
At server side
Here I have validated
CheckBoxList control as must be
checked CheckBoxList control befor
going farther process using
ServerValidateEvent
.aspx Code:
|
// asp CustomValidator
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Please select at least one qualification"
OnServerValidate="ValidateCheckBoxList"></asp:CustomValidator>
|
.cs Code:
|
// ValidationCheckBoxLIst function call by CustomValidator event
public void ValidateCheckBoxList(object sender,
ServerValidateEventArgs e)
{
int cnt = 0;
for (int i = 0;
i < CheckBoxList1.Items.Count; i++)
{
if (CheckBoxList1.Items[i].Selected)
{
cnt++;
}
e.IsValid = (cnt == 0) ? false :
true;
}
}
|
Validations for DropDownList in asp.net
CustomValidator on DropDownList
Mostly developers facing
problem, validating values in
DropdownList control on client side to avoid
costly postback and validate values on server side. There is a very
simple solution to this problem. There is a very handy dandy
CustomValidator control that can be used to
validate any control on the page. There is one property of validator controls
where lot of developers get stuck is
ControlToValidate. This is where
CustomValidator becomes handy. It does not
require that property to be set. And that makes it very useful to validate not
just one control but multiple control values.
We can use
CustomValidator at server side also.
At client side
‘CountryCheck’ javascript function
force to select one of them item in
DropDownList control using
Client side event ‘ClientValidatorFunction’
of CustomValidator control.
.aspx Code:
|
<script
type="text/javascript">
function CountryCheck(source, args)
{
var ddlCountry = document.getElementById ("<%=ddlCountry.ClientID%>");
var country =
ddlCountry.options[ddlCountry.selectedIndex].value;
if (country == "0")
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
}
</script>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Please Select Country."
ControlToValidate=" DropDownList1"
ClientValidationFunction="CountryCheck"></asp:CustomValidator>
<asp:Button
ID="Button1"
runat="server"
Text="Submit"
/>
|
At server side
‘SelectList function force to select
one of them item in DropDownList
control using server side event ‘OnServerValidate’
of CustomValidator control.
.aspx Code:
|
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Plase Select Country."
ControlToValidate="ddlCountry"
OnServerValidate="SelectList"></asp:CustomValidator>
<asp:Button
ID="Button1"
runat="server"
Text="Submit"
/>
|
.cs Code:
|
public void
SelectList(object sender,
ServerValidateEventArgs e)
{
if (ddlCountry.SelectedIndex == 0)
e.IsValid = false;
else
e.IsValid = true;
}
|
CompareValidator on DropDownList
Through
CompareValidator we can validate
DropDownList as
RequerFieldValidator
.aspx Code:
|
<asp:CompareValidator ID="CompareValidator1" runat="server"
ControlToValidate="DropDownList1"
ValueToCompare="0"
ErrorMessage="Field is
required" Operator="NotEqual" ></asp:CompareValidator>
|
RequiredFieldValidator on DropDownList
RequiredFieldValidator is used to make mandatory field
for selected item in DropDownList
.aspx Code:
|
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="Field is required"
InitialValue="0"
ControlToValidate="DropDownList1"></asp:RequiredFieldValidator>
|
RangeValidator on DropDownList
RangeValidator proved facility to define limit
of selected items.
.aspx Code:
|
<asp:RangeValidator ID="RangeValidator1" runat="server" ErrorMessage="age between 18-28"
MinimumValue="18"
MaximumValue="28"
Type="Integer"
ControlToValidate="DropDownList1"></asp:RangeValidator>
|
Validations for FileUpload in asp.net
FileUpload control is used for
uploading file to the server from the client side.
For detailed reading about FileUpload visit:
http://mindstick.com/Articles/c323d0d8-495e-46c6-a12d-024908aa7a29/
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.fileupload.aspx
RequiredFieldValidator on FileUpload
For validating for required
field we have to use RequiredFieldValidator.
With this control, the
validation fails if the input value does not change from its initial value. By
default, the initial value is an empty string ("").
For more details visit:
http://mindstick.com/Articles/34e5fb73-9bdf-4850-9a3e-e10a5f428148/
.aspx Code:
|
<asp:FileUpload
ID="FileUpload1"
runat="server"
/>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="RequiredFieldValidator"
Text="*"
ControlToValidate="FileUpload1"></asp:RequiredFieldValidator>
|
.cs Code:
|
protected void
Button1_Click(object sender,
EventArgs e)
{
try
{
string filename = System.DateTime.Now.Date.Day.ToString() + System.DateTime.Now.Date.Second.ToString()+"_" + FileUpload1.PostedFile.FileName;
FileUpload1.SaveAs(Server.MapPath("document/")
+ filename);
ClientScript.RegisterClientScriptBlock(GetType(),
"alert",
"alert('File Upload Success')", true);
}
catch{}
}
|
CustomValidator on FileUpload
Custom Validation Control use at
Server Side, Validation to check File
Size before uploading
.aspx Code:
|
<asp:FileUpload
ID="FileUpload1"
runat="server"/>
<asp:CustomValidator
ID="CustomValidator2"
runat="server"
ErrorMessage="FileSize
should not exceed 20KB" ControlToValidate="FileUpload1"
OnServerValidate="checkfilesize"></asp:CustomValidator>
<asp:Button
ID="Button1"
runat="server"
Text="Save"
onclick="Button1_Click"/>
|
.cs Code:
|
protected void
checkfilesize(object source,
ServerValidateEventArgs e)
{
string data = e.Value;
e.IsValid = false;
double filesize =
FileUpload1.FileContent.Length;
if (filesize > 20580)
{
e.IsValid = false;
}
else
{
e.IsValid = true;
}
}
protected void
Button1_Click(object sender,
EventArgs e)
{
if (Page.IsValid)
{
string filename = System.DateTime.Now.Date.Day.ToString() + System.DateTime.Now.Date.Second.ToString() +
"_" + FileUpload1.PostedFile.FileName;
FileUpload1.SaveAs(Server.MapPath("document/")
+ filename);
ClientScript.RegisterClientScriptBlock(GetType(),
"alert",
"alert('File Upload Success')", true);
}
}
|
RegularExpressionValidation on FileUpload
In this article I am going to
explain how we can check and validate user for uploading only certain files and
making uploading of file to be must for submission of form.
The RegularExpressionValidator
control is used to ensure that an input value matches a specified pattern. The
validation will not fail if the input control is empty. Use the
RequiredFieldValidator control to make the field required.
For more details
about RegularExpressionValidator visit following link:
http://www.mindstick.com/Articles/46ad6aee-13e6-4aad-a24a-268d20467f9f/?RegularExpressionValidator%20Control%20in%20ASP.Net
.aspx Code:
|
<asp:FileUpload
ID="FileUpload1"
runat="server"
/>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
runat="server"
ErrorMessage="Only .doc
, .docx or .txt files are allowed."
ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.doc|.docx|.txt)$"
ControlToValidate="FileUpload1">*</asp:RegularExpressionValidator>
|
Here, regular expression for
.doc, .docx, .txt files is:
"^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.doc|.docx|.txt)$"
If you want some more or other
files type to be uploaded then you can replace or add more extension with the
above mentioned extensions.
Validations for RadioButton in asp.net
RadioButton controls are used when we need to make
multiple sets of choices available, but we want the user to select only one of
them. If they click on a second selection after making a first, the first
selection is replaced by the second.
CustomValidator on RadioButton
If we want to make mandatory
field for choosing RadioButton Control on webpage, for that we can use
CustomValidator, because
RequiredFieldValidator not support
RadioButton Control. We can validate CustomValidator at client side and
server side.
At client side
Here
CustomeValidator is used at client
side using JavaScript function ‘DirectionValidate’.
That force to choose RadioButton
control before going father task. Means here
CustomValidator is used as
RequiredFieldValidator.
.aspx Code:
|
<script
language="javascript"
type="text/javascript"
>
function DirectionValidate(source,args){
if (document.getElementById("<%=
RadioButton1.ClientID %>").checked
||document.getElementById("<%=
RadioButton2.ClientID %>").checked)
args.IsValid = true;
else
args.IsValid = false;
}
</script>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Choose one option"
ClientValidationFunction="DirectionValidate"></asp:CustomValidator>
|
At server side
When browser’s javascript is
disabling than above task we can perform at server side. That force to choose
RadioButton control before going
father task. Means here CustomValidator is used as
RequiredFieldValidator.
.aspx Code:
|
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Choose one option"
OnServerValidate="DirectionValidate"></asp:CustomValidator>
|
.cs Code:
|
protected void DirectionValidate(object source,
ServerValidateEventArgs args)
{
args.IsValid = RadioButton1.Checked || RadioButton2.Checked;
}
|
Validations for RadioButtonList in asp.net
The ASP.NET
RadioButtonList control is used to
create a defined list of options in which a user can choose from.
RequiredFieldValidator on RadioButtonList
This asp control is used for
selecting one of them item of RadioButtonList.
.aspx Code:
|
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="RadioButtonList1"></asp:RequiredFieldValidator>
|
CustomValidator on RadioButtonList
At client side
Here
CustomeValidator is used at client
side using javascript function ‘ValidateRadioButtonList. That force to choose
RadioButtonList control before going father task. Means here
CustomValidator is used as
RequiredFieldValidator.
.aspx Code:
|
<script
language="javascript"
type="text/javascript"
>
function ValidateRadioButtonList(source,
arguments) {
var RBL = document.getElementById("<%=RadioButtonList1.ClientID%>");
var radiobuttonlist =
RBL.getElementsByTagName("input");
var counter = 0;
var atLeast = 1
for (var
i = 0; i < radiobuttonlist.length; i++) {
if (radiobuttonlist[i].checked)
counter++;
}
if (atLeast = counter)
arguments.IsValid = true;
else
arguments.IsValid = false;
}
</script>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Choose one option"
ClientValidationFunction
="ValidateRadioButtonList"></asp:CustomValidator>
|
At server side
When browser’s javascript is
disabling than above task we can perform at server side. That force to choose
RadioButtonList control before going
father task. Means here CustomValidator is used as
RequiredFieldValidator.
.aspx Code:
|
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Choose one option"
OnServerValidate="ValidateRadioButtonList"></asp:CustomValidator>
|
.cs Code:
|
public void ValidateRadioButtonList(object sender,ServerValidateEventArgs
e)
{
int counter = 0;
int atLeast = 1;
for (int i = 0;
i < RadioButtonList1.Items.Count; i++)
{
if (RadioButtonList1.Items[i].Selected)
counter++;
}
if (atLeast == counter)
e.IsValid = true;
else
e.IsValid = false;
}
|
Validations for TextBox in asp.net
The TextBox control is used to
create a text box where the user can input text.
RequiredFieldValidator on TextBox
The RequiredFieldValidator
control is used to make an input control a required field.This control will
display error message if the field on which validation control is applied is
left blank.
.aspx Code:
|
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="TextBox1">*</asp:RequiredFieldValidator>
|
RangeValidator on TextBox
The RangeValidator control is
used to check that the user enters an input value that falls between two values.
It is possible to check ranges within numbers, dates, and characters. Here I
have checked integer value.
.aspx Code:
|
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:RangeValidator ID="RangeValidator1" runat="server" ErrorMessage="RangeValidator"
ControlToValidate="TextBox1"
MinimumValue="18"
MaximumValue="28"
Type="Integer"
ToolTip="values between
18-28">*</asp:RangeValidator>
|
CompareValidator on TextBox
The CompareValidator control is
used to compare the value of one input control to the value of another input
control or to a fixed value. Here I have compare two TextBox’s String.
.aspx Code:
|
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox2"
runat="server"></asp:TextBox>
<asp:comparevalidator ID="Comparevalidator1" runat="server" errormessage="CompareValidator"
ControlToCompare="TextBox1"
ControlToValidate="TextBox2"
Type="String"
ToolTip="String not
matched">*</asp:comparevalidator>
|
RegularExpressionValidator on TextBox
The RegularExpressionValidator
control is used to ensure that an input value matches a specified pattern. Both
server- and client-side validation are performed unless the browser does not
support client-side validation or the EnableClientScript property is set to
false. Here I have checked internet email id formate.
.aspx Code:
|
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:RegularExpressionValidator
ID="RegularExpressionValidator1"
runat="server"
ErrorMessage="RegularExpressionValidator"
ControlToValidate="TextBox1"
ToolTip="Email id
not in correct format"
ValidationExpression"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
</asp:RegularExpressionValidator>
|
CustomValidator on TextBox
The CustomValidator control
allows you to write a method to handle the validation of the value entered.
At client side
.aspx Code:
|
<script
type="text/javascript">
function stringlenth(source, argument) {
var txtValue = document.getElementById("TextBox1").value;
if (txtValue.length >= 8 &&
txtValue.length <= 16)
argument.IsValid = true;
else
argument.IsValid = false;
}
</script>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator"
ClientValidationFunction="stringlenth"
ToolTip="String Lengh
between 8-16">*</asp:CustomValidator>
|
At server side
.aspx Code:
|
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator"
OnServerValidate="stringlenth"
ToolTip="String Lengh
between 8-16">*</asp:CustomValidator>
|
.cs Code:
|
public void stringlenth(object sender,
ServerValidateEventArgs e)
{
if (TextBox1.Text.Length >= 8 &&
TextBox1.Text.Length <= 16)
e.IsValid = true;
else
e.IsValid = false;
}
|
|