Develop Reference

Setting MaskedEditValidator MaxValue From Code Behind Not Working

I am trying to set MaxValue of MaskedEditValidator which is of date type but it is not Validating on the MaxValue after click on Submit Button. Below Is my HTML Code for Masked Edit Validator
<asp:TextBox ID="txtLectureDate" runat="server" class="form-control" placeholder="Please Select End Date" TabIndex="3" OnTextChanged="txtEndDate_TextChanged" ValidationGroup="Submit" AutoPostBack="true">
</asp:TextBox>
<ajaxtoolkit:CalendarExtender ID="cldrexEndDate" runat="server" TargetControlID="txtLectureDate" Format="dd/MM/yyyy" PopupButtonID="imgECal"
CssClass=" cal_Theme1">
</ajaxtoolkit:CalendarExtender>
<ajaxtoolkit:MaskedEditExtender ID="meeEndDate" runat="server" TargetControlID="txtLectureDate" Mask="99/99/9999" MaskType="Date" AcceptNegative="Left" MessageValidatorTip="false" InputDirection="LeftToRight">
</ajaxtoolkit:MaskedEditExtender>
<ajaxtoolkit:MaskedEditValidator ID="mevEndDate" runat="server" ControlToValidate="txtLectureDate" ControlExtender="meeEndDate" IsValidEmpty="false" EmptyValueMessage="Please Enter End Date" ErrorMessage="Please Enter Valid Date in [dd/MM/yyyy]" InvalidValueMessage="Please Enter Valid Date" MaximumValueMessage ="Attendance Date Should Not Be Greater Than Current Date" ValidationGroup="Submit" Display="None">
</ajaxtoolkit:MaskedEditValidator>
And below is my Code Behind
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
mevEndDate.MaximumValue = DateTime.UtcNow.AddHours(5.5).ToString("dd/MM/yyyy");
}
}
Please Help Me in this.

Please ensure that MaskedEdit.UserDateFormat="DayMonthYear". Also I noticed, that validation occurs only on textbox blur.

asp.net How to set textbox length based on dropdownlist selection? C#

The drop down list contains three countries, How do you set the minimum number of digits to be entered in the postcode text-box based on what country is selected.
For example, if user selects America, then the postcode text-Box should be set to "[0-9]{6}". But if they select Australia then the post code should be "[0-9]{4}".
<asp:DropDownList ID="dropDownList" runat="server">
<asp:ListItem Value="-1">Country</asp:ListItem>
<asp:ListItem>America</asp:ListItem>
<asp:ListItem>Australia</asp:ListItem>
<asp:ListItem>Sweden</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidateCountry"
initialValue="-1"
ForeColor="Red"
runat="server"
ErrorMessage="Please choose Country"
ControlToValidate="dropDownList"/>
<asp:Label ID="Label1" runat="server" Text="PostCode"></asp:Label>
<asp:textbox id="TextBox1" runat="server" ></asp:textbox>
<asp:CustomValidator id="CustomValidator1" runat="server"
OnServerValidate="TextValidate"
ControlToValidate="TextBox1"
ErrorMessage="Invalid postcode.">
</asp:CustomValidator>
<asp:Button ID="BtnNext" runat="server" Text="Next" />

You can do this on the SelectedIndexChanged events of the dropdownlist. Set the AutoPostback to true in the dropdownlist write the similar described logic according to your need.
private void dropDownList_SelectedIndexChanged(object sender, System.EventArgs e)
{
//your logic, something like that
if(dropDownList.SelectedText =="America")
{
TextBox1.MaxLength= your value ...
}
}
<asp:DropDownList ID="dropDownList" runat="server" AutoPostback = "true">
EDIT:
You can check the total number of character of textbox with your predefined value.
int minlength = 5;
if(textbox1.text.length < minlength)
{
//Flag error on validation label
}
else
{
//your stuff
}

You also have client side events for the asp .net dropdown. You can set a javascript function to execute if the dropdown selection changes without posting back to the server. This will make the experience more streamlined and you can alter the min and max length directly with jquery.
You can do it like this:
DropDownList1.Attributes.Add("onChange", "return OnSelectedIndexChange();")

enabling/disabling validation from code behind c#

I have some asp code written for a form. One of the fields must have 3 types of validation, 2 of which are alway enabled, the other 2 must be "enabled" only if a peculiar value has been selected from a dropdownlist.
How am I supposed to achieve this task?
I have disabled the 2 extra validations by defaults and wold like to reactivate on dropdownlist specific selection.
I show you my code here.
ASP.NET code:
<tr>
<td class="style1">
<asp:Label ID="LabelPiva" runat="server" Text="Partita IVA" meta:resourcekey="LabelPiva" Font-Bold="True" />
</td>
<td>
<asp:TextBox ID="pivaTextBox" runat="server" Text='<%# Bind("piva") %>'
MaxLength="50" Width="400px" />
<asp:RequiredFieldValidator ID="RequiredPiva" runat="server"
ControlToValidate="pivaTextBox"
ErrorMessage="<%$ Resources:Resource, CampoObbligatorio %>" Display="Dynamic"
CssClass="little_text" />
<asp:CustomValidator ID="PivaEsistente" runat="server"
ErrorMessage="Partita IVA esistente nel database" meta:resourcekey="PivaEsistente"
ControlToValidate="pivaTextBox" CssClass="little_text" Display="Dynamic"
onservervalidate="PIVAEsistente_ServerValidate"></asp:CustomValidator>
<asp:RegularExpressionValidator ID="PivaSize" runat="server"
ControlToValidate="pivaTextBox" CssClass="little_text" Display="Dynamic"
ErrorMessage="Controllare la lunghezza della partita iva. 11 caratteri e solo numeri."
ValidationExpression="^[0-9]{11}$" Enabled="False" ValidationGroup="soloItalia">
</asp:RegularExpressionValidator>
<asp:CustomValidator ID="PivaErrata" runat="server"
ErrorMessage="Partita IVA non corretta. Controllare le cifre." meta:resourcekey="PivaErrata"
ControlToValidate="pivaTextBox" CssClass="little_text" Display="Dynamic"
onservervalidate="ValidatePI" Enabled="False" ValidationGroup="soloItalia"></asp:CustomValidator>
</td>
</tr>
The CustomValidator with id PivaErrata and the RegularExpressionValidator with id PivaSize must be fired only when dropdownlist hits the "it" value.
This is the code-behind in c# to intercept the value of the dropdownlist:
protected void nazioneDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl = (DropDownList)sender;
DropDownList ddlProv = (DropDownList)FormUser.FindControl("provinciaDropDownList");
if ("it".Equals(ddl.SelectedValue))
{
ddlProv.Enabled = true;
}
else
{
ddlProv.SelectedIndex = 0;
ddlProv.Enabled = false;
}
}
As you can see, another dropdownlist gets enabled when that specific value "it" is fired in the nations dropdownlist.
I would like to activate the validations controls too.
I assigned a validationgroup to those 2 validations, but I am not sure how to "enable" them at once.
Any help?
Thank you very much.

you can use Enabled property of the Validation controls to enable or disable them.
Try This:
if (ddl.SelectedItem.ToString().Equals("it"))
{
ddlProv.Enabled = true;
//add these two statements to enable
PivaSize.Enabled=true;
PivaErrata.Enabled=true;
}
else
{
ddlProv.SelectedIndex = 0;
ddlProv.Enabled = false;
//add these two statements to disable
PivaSize.Enabled=false;
PivaErrata.Enabled=false;
}

How to use validation dynamically?

I am using below .aspx code to validate textbox..this is working perfectly
<asp:TextBox ID="tbnooflecture" runat="server" Width="113px" Height="33px">
</asp:TextBox>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
ForeColor="#6600FF" runat="server"
ErrorMessage="Total Attendence Should be Like 3 or 50"
ValidationGroup="upper" Display="Dynamic"
ControlToValidate="tbnooflecture"
ValidationExpression="[0-9][0-9]|[0-9]">*
</asp:RegularExpressionValidator>
What I want that above this textbox there is dropdownlist named batchname and if length of batchname is 2, I want to put validation that Attendence should be even no.
I have used below code on button click
if (lenghth == 2)
{
if (!System.Text.RegularExpressions.Regex.IsMatch(name, "[1-9][02468]"))
{
Label5.Text = "Only Even Entry for Labs";
Label5.Visible = true;
}
}
I want to do it on client-side. How can I do it in C#?

You need to use custom-validation control of asp.net.
Few useful links
https://web.archive.org/web/20211020145934/https://www.4guysfromrolla.com/articles/073102-1.aspx
http://msdn.microsoft.com/en-us/library/f5db6z8k%28v=vs.71%29.aspx
http://www.w3schools.com/aspnet/control_customvalidator.asp
Custom validator error text through javascript?

That is server side validation #user2053138, you mentioned in comment.
Check out the following example:
<asp:TextBox id="Text1"
runat="server" />
<asp:CustomValidator id="CustomValidator1"
ControlToValidate="Text1"
ClientValidationFunction="ClientValidate"
OnServerValidate="ServerValidation"
Display="Static"
ErrorMessage="Not an even number!"
ForeColor="green"
Font-Name="verdana"
Font-Size="10pt"
runat="server"/>
<script language="javascript">
function ClientValidate(source, arguments)
{
if (arguments.Value % 2 == 0 ){
arguments.IsValid = true;
} else {
arguments.IsValid = false;
}
}
</script>

Validation Message By Javascript

I have an question here. How to disable a validation when checkbox checked. i have tried ValidatorEnable(control, false) , it can't work for me.
<dxe:BaseCheckBox runat ="server" ID="chkIsChecked" ClientInstanceName ="chkIsChecked">
<ClientSideEvents CheckedChanged="OnSelectionChanged"/>
</dxe:BaseCheckBox>
<dxe:BaseComboBox runat ="server" ID="cboLabour" ClientInstanceName ="cboLabour" ValueType="System.String" ClientEnabled="false" >
<ValidationSettings SetFocusOnError="True" ErrorText="This field is required to fill."
ErrorDisplayMode="ImageWithTooltip" ValidationGroup="RejectReason"
CausesValidation="false">
<RequiredField IsRequired="True" ErrorText="This field is required to fill.">
</RequiredField>
</ValidationSettings>
</dxe:BaseComboBox>
My Javascript:
function OnSelectionChanged(s,e)
{
if(chkIsChecked.GetValue())
{
cboLabour.SetEnabled(true);
}
else
{
cboLabour.SetEnabled(false);
cboLabour.SetValue('');
}
}
Thanks for Advice.

To do this you'll need to use custom validation. Something like this:
function OnLabouryValidation(s, e) {
if (chkIsChecked.GetValue())
return;
var v = e.value;
if(e.value)
return;
e.isValid = false;
e.errorText = "Required.";
}
There's "documentation" on custom validation here, but in my quick reading, it's not explicitly clear how to wire this up.
http://documentation.devexpress.com/#AspNet/CustomDocument11135

As i discovered from your question you are looking for the group validation:
First Set the ValidateOnLeave="False" in ValidationSettings and Specify the Validation group name to your controls and then use the client side ASPxClientEdit.ValidateGroup('MyGroup');method to validated your group of controls by doing your some customization as per your requirment.
Markup:
<dxe:BaseCheckBox runat ="server" ID="chkIsChecked" ClientInstanceName ="chkIsChecked">
<ClientSideEvents CheckedChanged="OnSelectionChanged"/>
</dxe:BaseCheckBox>
<dxe:BaseComboBox runat ="server" ID="cboLabour" ClientInstanceName ="cboLabour" ValueType="System.String" ClientEnabled="false" >
<ValidationSettings SetFocusOnError="True" ErrorText="This field is required to fill."
ErrorDisplayMode="ImageWithTooltip" ValidationGroup="RejectReason"
ValidateOnLeave="False">
<RequiredField IsRequired="True" ErrorText="This field is required to fill.">
</RequiredField>
</ValidationSettings>
</dxe:BaseComboBox>
<dx:ASPxButton ID="btn" runat="server" Text="Validate"
AutoPostBack="False" CausesValidation="False">
<ClientSideEvents Click="function(s, e) {
if (chkIsChecked.GetValue()) // if checked then validate the group
{
ASPxClientEdit.ValidateGroup('RejectReason');
}
}" />
</dx:ASPxButton>
Follow these documentation and implement whatever you are trying to do.
How to: Validate a Group of Editors
How to: Validate All Editors on a Page
How to: Implement a Custom Validation
ASPxClientEdit.Validation Event