I'm having an issue with a standard ASP.NET portal.
Suppose that has a TextBox and a RequiredFieldValidator. I want the validator only shows the error message when I input a wrong format text.
However the current issue is even I haven't input nothing, it displays the message. After I type the correct text, it disappeared then.
My code:
<tr>
<td>
*First Name:
</td>
<td>
<asp:TextBox runat="server" ID="FirstName" MaxLength="50" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" ControlToValidate="FirstName"
ErrorMessage="First Name is required." EnableClientScript="True" />
</td>
</tr>
<tr>
The code behind is something like
protected void Page_Load(object sender, EventArgs e)
{
Page.Validate();
if (!Page.IsPostBack)
{
// blah
}
}
Thanks.
That's what the RequiredFieldValidator is supposed to do. Use another type of validator such as a RegularExpressionValidator or a CustomValidator.
Also how do you define the correct format for a person's name?
So you need to use RegularExpressionValidator not RequiredFieldValidator.Let us say you want your textbox to accept only alphanumeric characters, you may set the format this way:
<asp:RegularExpressionValidator id="val1" runat="server" ValidationExpression="[a-zA-Z0-9]+" ControlToValidate="TextBox1"/>
Related
I have applied RangeValidator on TextBox. But it always shows me error : Invalid Range, though I have given minimum value 10 and maximum value 25. I want that user must not enter value whose length is less than 10 and greater than 25. I want that user can enter anything, so I have type="string" in RangeValidator. But it always gives me error message : Invalid Range.
<td>
<asp:TextBox ID="tbPassword" runat="server" MaxLength="25" type="password">
</asp:TextBox>
<asp:RequiredFieldValidator ID="rfvPassword" runat="server"
ControlToValidate="tbPassword" ForeColor="red" Display="Dynamic"
ErrorMessage="Password is required." SetFocusOnError="true">
</asp:RequiredFieldValidator>
<asp:RangeValidator ID="rvPassword" ControlToValidate="tbPassword"
ForeColor="red" Display="Dynamic" MinimumValue="10" MaximumValue="25"
SetFocusOnError="true" Type="String" runat="server"
ErrorMessage="Invalid Range">
</asp:RangeValidator>
</td>
For this you will need to use a CustomValidator control as suggested by Emad Mokhtar.
For server side validation, create an event like this.
protected void TextValidate(object source, ServerValidateEventArgs e)
{
e.IsValid = (e.Value.Length >= 10 && e.value.Length <= 25);
}
For client side validation, create a javascript function like this.
<script type="text/javascript">
function validateLength(oSrc, args){
args.IsValid = (args.Value.length >= 10 && args.Value.length <= 25);
}
</script>
Then in your aspx markup have the CustomValidator control like this.
<asp:Textbox id="tbPassword" runat="server" text=""></asp:Textbox>
<asp:CustomValidator id="customValidator" runat="server"
ControlToValidate = "tbPassword"
OnServerValidate="TextValidate"
ErrorMessage = "Password must be between 10 to 25 characters!"
ClientValidationFunction="validateLength" >
</asp:CustomValidator>
You can find more details here.
This validation can be implemented Using CustomValidator Control and apply your client and sever side validation, please find sample here.
I recently observed this cool feature, just use below attributes to asp control/html.
minLength="10" maxLength="1000"
as the attributes clearly states it allows minimum of 10 characters and maximum of 1000 characters.
I have a div which acts like a modal popup. Inside that, I need a validation for which I setup a custom validator. But the message doesn't get fired, though the alert box does.
My code:
if ((oldFromTime <= newFromTime) && (oldToTime > newFromTime)) {
alert("Choose time ahead of the ones saved earlier.!");
arguments.IsValid = false;
}
else {
arguments.IsValid = true;
}
And my custom validator
<asp:CustomValidator id="cboToTimeMins_CustomValidator" ControlToValidate="cboToTimeMins" ClientValidationFunction="validateTime"
Display="static" ErrorMessage="Selected time range falls in the range of the ones saved earlier...! Choose another." runat="server" ValidationGroup="Timetable"/>
cboToTimeMins is my dropdown box, and I need to set the validation message based on the value selected from it.
Is there something wrong in my code?
P.S. I am in need of only CLIENT SIDE validation.
Here's my solution. I removed the custom validator for the Dropdown and added it to a button instead. Also, I removed the alert message in the Javascript function.
Here's my example solution
<td class="normal">Price<span class="required">*</span></td>
<td class="normal" colspan="6">
<asp:TextBox ID="txtPrice" CssClass="text" Enabled="true" runat="server" MaxLength="10" Width="100px" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtPrice"
ErrorMessage="* Please Input Your Price" Display="Dynamic" ValidationGroup="hdrValidation"/>
</td>
And you need to validate
Page.Validate("hdrValidation")
If Not Page.IsValid Then Exit Sub
Hi all I need a required field validator for my textbox..This is my textbox..
<asp:TextBox ID="txtTimeSlotGroupName" runat="server" AutoPostBack="false"
ClientIDMode="Static"></asp:TextBox>
<font color="red">*</font>
<asp:RequiredFieldValidator ID="RequiredFieldValidator_txtTimeSlotGroupName"
runat="server" ControlToValidate="txtTimeSlotGroupName" Display="None"
ErrorMessage="Timeslot Group Required!" ForeColor="Red" InitialValue="0"
ValidationGroup="TimeSlot"></asp:RequiredFieldValidator>
My button:
<asp:Button ID="btnAddTimeSlots" Text="Add Timeslots" CssClass="button"
runat="server" OnClick="btnAddTimeslots_Click" ValidationGroup="TimeSlot"
OnClientClick="javascript:shouldsubmit=true;"/>
I am not getting the error message. Any solutions?
You have to define the Validation Group Of your Textbox too....to make it work
<asp:TextBox ID="txtTimeSlotGroupName" runat="server"
AutoPostBack="false" ValidationGroup="TimeSlot" ClientIDMode="Static"></asp:TextBox>
Remove InitialValue="0" from the RequiredFieldValidator tag, it is not required when you are validating the textbox.
Even I was facing the same issue. Kindly check if any javascript are present on your page. Irrespective of above make use of Page.Validate() method and if(Page.IsValid) in your code. This will automatically force your validation controls and issue will be solved
If two objects have the same id the required field validator Does not work.
You just add ValidationGroup="TimeSlot" in textbox
<asp:TextBox ID="txtTimeSlotGroupName" runat="server" AutoPostBack="false"
ValidationGroup="TimeSlot" ClientIDMode="Static"></asp:TextBox>
I had this same issue... but none of the above answers were the fix for me...
My problem was that I was missing the Page.isValid in my button press method. Below is my button code and the method called by the button.
Button:
<asp:Button ID="btnBtmSave" runat="server" Text="Save" OnClick="btnSave_Click" BtnGroup="save" TabIndex="18" />
Button method:
protected void btnSave_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
//Logic goes here
}
}
make the same Validation Group Of all your text and Add button and Validation
ValidationGroup="AAA"
and add the code to your save button:
If (Page.IsValid) Then
YOURSQL.Insert()
'or ur code here'
End If
In my case, For button, I was using both client side validation i.e onClientClick="return validate()", and ASP.NET Validation i.e Reguired field Validation (ValidationGroup). Hence the Required field validators were not firing.
I want to add an "anti-robot" question to the CreateUserWizard as a more accessible alternative to a Captcha control. I'm fairly new to asp and finding that I'm a bit stuck in a WinForms mindset. However, I have come up with something that appears to work.
Markup:
<asp:CreateUserWizard ID="CreateUserWizard1" runat="server">
.
.
<tr>
<td align="right">
<asp:Label ID="AntiRobotQuestion" runat="server" AssociatedControlID="AntiRobotAnswer">
Question:
</asp:Label>
</td>
<td>
<asp:TextBox ID="AntiRobotAnswer" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="AntiRobotAnswerRequired" runat="server" ControlToValidate="AntiRobotAnswer" ErrorMessage="Answer is required." ToolTip="Answer is required." ValidationGroup="CreateUserWizard1">
</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="center" colspan="2" style="color:Red;">
<asp:Literal ID="CustomErrorMessage" runat="server" Visible="False" EnableViewState="False"></asp:Literal>
</td>
</tr>
.
.
</asp:CreateUserWizard>
Code behind:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
//Set up the Anti-Robot Question and Answer
Label robotQuestion = (Label)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("AntiRobotQuestion");
//Simulate randomly selecting a question and answer from a database table...
robotQuestion.Text = "What is the capital of France";
Session["AntiRobotAnswer"] = "Paris";
}
}
protected void CreateUserWizard1_CreatingUser(object sender, LoginCancelEventArgs e)
{
//Check the anti-robot Q & A
TextBox robotAnswer = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("AntiRobotAnswer");
if (robotAnswer.Text != (string)Session["AntiRobotAnswer"])
{
Literal errorMessage = (Literal)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("CustomErrorMessage");
errorMessage.Text = "Wrong answer! Are you a robot?";
errorMessage.Visible = true;
e.Cancel = true;
}
}
Is this an acceptable way to code this? Two things in particular look a bit "untidy" to me:
The use of FindControl to pull out references to controls in the markup.
Storing the expected answer in a session variable. (How secure is it?)
EDIT (2012-01-23)
Some valid design alternatives have been given. However, I have a valid reason to use this question and answer technique (possibly in addition to the honeypot idea). For example, a question relevant to the subject of a forum can help to prevent human spammers as well as bots. The question is: is the code outlined above an acceptable way to do this? Coming from a WinForms background, it looks a bit clunky to me - but maybe that's what asp is supposed to look like.
As I say, I do not like the idea of you to ask for Paris.
The simplest way is to use a non visible field and see if a bot fill it with data, the honeypot idea http://haacked.com/archive/2007/09/11/honeypot-captcha.aspx
also you can use the NoBot from asp.net toolkit
http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/NoBot/NoBot.aspx
There are many other ideas on this SO article Practical non-image based CAPTCHA approaches?
I have used a required field validator followed by a regular expression validator but the required field validator is not working.....
<asp:TextBox ID="txtSummary" runat="server" TextMode="MultiLine" Width="700px"
CssClass="txtStyle" Font-Names="Arial" MaxLength="1000"
ValidationGroup="Valtxt" TabIndex="2" Rows="4">
</asp:TextBox>
<asp:RegularExpressionValidator ID="regValSummary" runat="server"
ControlToValidate="txtSummary" Display="Dynamic"
ValidationExpression="[^<>&#!]*" ValidationGroup="Valtxt">
Invalid characters(<>&#!) are not allowed
</asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="reqvalSummary" runat="server"
ControlToValidate="txtSummary" ErrorMessage="Summary is required"
ValidationGroup="Valtxt" Display="Dynamic">
</asp:RequiredFieldValidator>
can anyone sees the problem???
The RequiredFieldValidator is triggered by the client side onchange event. It sounds like you're expecting it to be triggered by the onblur event, such that tabbing away from the textbox would fire the validation.
Before jumping to that, I suspect this is what you are seeing and to validate that it's actually working you need to trigger onchange. To do so, enter some text in the textbox, tab away, tab back to it, clear the textbox, then tab away once more. You should now see the RequiredFieldValidator's error message since it's contents have changed.
Back to the onblur issue. To accomplish that behavior you could add the onblur attribute in your code-behind and have it call the ValidatorValidate(...) JavaScript method as follows:
void Page_Load(object sender, EventArgs e)
{
txtSummary.Attributes.Add("onblur", "ValidatorValidate(" + reqvalSummary.ClientID + ")");
}
Alternately, you could accomplish the same thing in markup. First, add this script block:
<script type="text/javascript">
function rfvBlur() {
var rfv = document.getElementById("<%= reqvalSummary.ClientID %>");
ValidatorValidate(rfv);
}
</script>
Second, update the <asp:TextBox.../> markup by adding onblur="rfvBlur()" so that it now looks like this:
<asp:TextBox ID="txtSummary" runat="server" TextMode="MultiLine" Width="700px" CausesValidation="true"
CssClass="txtStyle" Font-Names="Arial" MaxLength="1000" ValidationGroup="Valtxt"
TabIndex="2" Rows="4" onblur="rfvBlur()" />
Yet another option is to validate the entire ValidationGroup by adding the following attribute to your <asp:TextBox.../> markup (no additional script block needed):
onblur="Page_ClientValidate('Valtxt')"
Adding this line to <appSettings> section of web.config worked for me (I had a problem when all validators stopped working when project was upgraded to .NET 4.5):
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
Source:
http://forums.asp.net/t/1876231.aspx?ASP+Net+4+5+Validation+Controls+not+working+with+AJAX+ToolkitScriptManager1
Why don't you change the regular expression of the "RegEx" validator to check if the textbox is empty instead of use another validator?
Anyway probabily you have not specify ValidationGroup="Valtxt" for the button or the control that raise the postback. Just add ValidationGroup="Valtxt" to the button or the server control that raise the post to the page
I put the following at the top of my btn_Click event handler (to prevent further code execution) and upon 'return', the rfv messages show...
Page.Validate("your validation group");
if (!Page.IsValid)
{
return;
}
<asp:TextBox ID="txtSummary" runat="server" TextMode="MultiLine" Width="700px"
CssClass="txtStyle" Font-Names="Arial" MaxLength="1000"
TabIndex="2" Rows="4">
</asp:TextBox>
<asp:RegularExpressionValidator ID="regValSummary" runat="server"
ControlToValidate="txtSummary" ErrorMessage="Invalid characters(<>&#!) are not allowed" Text="*"
ValidationExpression="[^<>&#!]*" ValidationGroup="Valtxt">
</asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="reqvalSummary" runat="server"
ControlToValidate="txtSummary" ErrorMessage="Summary is required" Text="*"
ValidationGroup="Valtxt">
</asp:RequiredFieldValidator>