I am having an issue with the requiredfieldvalidator control not working on an ASP.net page. I have completed the attributes of that field properly, but when I test it, the postback is allowed to happen even if the field in question is blank.
So I want to do server side validation instead. What is the best way to do that? In the event that caused the postback? Also, if I find out the field is blank, how do I get the user back to the screen with all other values they placed on other fields intact and a message saying "This field cannot be blank".
EDIT:
This is the code:
<asp:TextBox ID="fName" TabIndex="1" runat="server" Width="221px" CausesValidation="True"></asp:TextBox>
<asp:RequiredFieldValidator ID="FNameRequiredFieldValidator" runat="server" ControlToValidate="fName" InitialValue="" ErrorMessage="Filter Name cannot be blank." ToolTip="Filter Name cannot be blank.">*</asp:RequiredFieldValidator>
You need to provide the markup for your Button / Link control as well.
The 'CausesValidation' attribute is not supposed to be used on TextBox controls.
The button you click needs to have that attribute set to "True".
Please provide that markup and then I can advise on the alternate server side validation.
To enable Client-side Validation, set the EnableClientScript="true" on the RequiredFieldValidator.
You should also always validate on the server side too. But the RequiredFieldValidator doesn't let you do any special-handling server-side. Just check if Page.IsValid(). This will return false if the field is not supplied.
If you want to do custom validation, use a CustomValidator.
Related
I am using latest DevEx Asp.net controls. In one of my pages, I have a form with AspxLabels and AspxTextBoxes. In certain textboxes I have a required field validation. I also have 2 check boxes on the page when clicked they populate certain textboxes with data from server.
Here is when the problem occurs.
When any of the check boxes are clicked, I make all textboxes that would be populated from server set to empty string. Then I set the data.
If one of the required fields already has some data, then setting it to empty string when checkbox is checked causes client side validation to kick in and server call to get the data is not done.
Does anyone have any idea how to approach and solve this problem?
Based on your description (aspx would make it more clear) you should set ValidationSettings.ValidateOnLeave to false and validate editor manually.
Here is sample from devex code central article:
<input type="button" value="Validate" onclick="tbTextBox2.Validate();" />
<dx:ASPxTextBox ID="tbTextBox2" runat="server" ClientInstanceName="tbTextBox2">
<ValidationSettings ValidateOnLeave="False">
<RequiredField IsRequired="True" ErrorText="Field is required." />
</ValidationSettings>
</dx:ASPxTextBox>
For various ways of validating form editor(s) on client side read How to raise validation on the client side.
Below is my html code. I have a email textbox and there is a login button. I have added a required field validator and regular expression validator for email textbox.
The problem is that when I type some thing in the email textbox browser's auto suggestion shows some list of emails. When I select any of those emails by using down arrow key and enter key it shows the error message for regular expression validation even though email is in proper format.
<asp:RequiredFieldValidator ID="reqValUserName" runat="server"
ErrorMessage="Email is required!"
ControlToValidate="txtUserName"
ValidationGroup="validateCredential"
Display="Dynamic">
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="regValUserName" runat="server"
ErrorMessage="Incorrect format!"
ControlToValidate="txtUserName"
ValidationExpression="\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*"
ValidationGroup="validateCredential"
Display="Static">
</asp:RegularExpressionValidator>
<asp:TextBox ID="txtUserName" runat="server"
TabIndex="1" CssClass="inputCredential" MaxLength="60"
AccessKey="E"
ValidationGroup="validateCredential">
</asp:TextBox>
<asp:Button ID="btnLogin" runat="server" CssClass="btnPrimary"
Text="Login" onclick="btnLogin_Click"
ValidationGroup="validateCredential"/>
In this image as you see if I select the email from the suggestion and press enter it is showing the wrong email validation message.
Can anyone please let me know, how to stop this kind of message display?
If there is any clarification needed regarding the question then please add it as a comment.
You could add the EnableClientValidation="false" attribute to the regex validator so that it only checks the format on the server after the other validators have been passed.
Or follow the advice here:
What determines the order validators fire in?
Also add regular expression validator
for email text box
<asp:RegularExpressionValidator ID="regtxtPrimaryEmail" runat="server" ControlToValidate="txtEmailId"
Display="Dynamic" CssClass="cssVal" ToolTip="Invalid email." ValidationGroup="registration"
ValidationExpression="\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
Then it will not submit until the email format correct.
It seems your some controls has autopostback="true" and your these controls are in update panel if not then what you can do is..Remove the display properties of all the validation controls and on btnLogin_Click Event call Validate(); Method.
Also read more In Depth detail on Validators on MSDN
you'll certainly get your answer....
Thanks for all your answers and suggestions.
Below is what I have done after going through all the answers.
<asp:RegularExpressionValidator ID="regValUserName" runat="server"
ErrorMessage="Incorrect format!"
ControlToValidate="txtUserName"
ValidationExpression="\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*"
ValidationGroup="validateCredential"
Display="Dynamic" EnableClientScript="false">
</asp:RegularExpressionValidator>
As you can see, I have added EnableClientScript="false" so that the error message will not be shown when I type half of email and select from auto suggestion and press enter.
Now the problem was it was always checking for whether entered credentials are correct of not as it was doing validation in server side. So I had some unnecessary code execution and database interaction.
So in click event handler of login button I did following change.
if(Page.IsValid)
{
// My credential check code
}
So the above block of code will run code for checking correctness of entered credentials only if they are in proper format.
But I am still looking for a better answer. This is only a work around. Because when it comes to performance server side validation can never match client side validation. Here I am compromising with usability. As I want user to be notified immediately after he/she enters a wrong formatted email. This can be achieved by using javascript, but I wonder if there is any way we can achieve it using validator controls..
This is happening because the client-side REV is validating on the partial input. For example, in the above illustration, the REV is validating "r" as its input. In order to verify this,
type in the entire email address "rupeshn#aol.com" >> then
select the suggested email using the down arrow >> then
hit the enter key.
The REV will not complain this time.
As for the solution: implement the REV in javascript. Add a label next to the textbox for error message. Call the js when the cursor exits the textbox. If the validation fails, find the label in the js and add the error message.
Just see the properties of the validator there you will find 'Display' property under Appearance section, set it to dynamic and VOLA!!
In a web form there are different asp.net validation controls. Is it possible to check a particular validation control is valid ? For example on leaving focus of textbox, first I will check requiredFieldValidatorUserName is valid ? If it is valid then I will check on server using ajax that this user name is not booked already.
Edit:
Explaination: I want to check validity (that input was valid) of a validation control on client side.
Please guide.
All validator controls implement IValidator which contains the IsValid property.
myValidatorControl.IsValid
The best way would be to use a CustomValidator with client side code, as this will display all the error messages, block form submission and also ensure that the validation is repeated at the server side - remember, just because you have client-side validation available, doesn't mean the user's seen it: Always validate your input at the server as well.
Your CustomValidator would then be coded to call the Ajax methods, and would show the error messages correctly to the client:
<asp:Label ID="UserNameLabel" AssociatedControlID="UserName" runat="server">
UserName *:</asp:Label>
<asp:TextBox ID="UserName" runat="server" />
<asp:RequiredFieldValidator ID="UserNameRequired" runat="server"
ControlToValidate="UserName" EnableClientScript="true"
ErrorMessage="You must supply a username!" />
<asp:CustomValidator ID="UserNameCustom" runat="server"
ControlToValidate="UserName"
ClientValidationFunction="CheckExisting"
OnServerValidate="UserNameCustomValidate"
ErrorMessage="Username already taken" />
And your ClientValidationFunction should look something like:
<script type="text/javascript">
function CheckExisting(source, arguments) {
// Pass the arguments.Value to your AJAX call:
if (ajaxCallUserNameTaken(arguments.Value)) {
arguments.IsValid = false;
}
}
</script>
(Obviously, you'll need to write the ajaxCallUserNameTaken method to call your page method/web service/etc.)
Doing it this way will ensure that the validation methods happen as expected; this will get called whenever the user tabs out of the textbox leaving a value (it won't get called if the textbox is empty), and will ensure that the user can't submit the page until they supply a unique value. You'll also want to create the method referenced in OnServerValidate to ensure that the value's good once it hits the server too - this should call the same code that the AJAX endpoint uses to reduce duplication of code, etc.
I was originally going to suggest that you could use the Page_Validators object on the client-side to do some checking in the onBlur event, but I don't really think this is suitable here as it results in more pain:
It assumes that although there might be more than one validator on the page, there's only the RequiredFieldValidator on the control we're checking
The RequiredFieldValidator isn't fired during OnBlur if a user moves out of a control without setting a value - only if they set and clear the value, so even if isvalid is true, you need to check for an empty string!
You could do this by setting the ValidationGroup for the Validator control that you want to treat as separate from the others. Make sure it matches the ValidationGroup of the control it's validating (your username field).
I have just faced the same issue and I Set CausesValidation="true" to the textbox control and it worked. Just give it a try :)
I have been messing around with this around for a bit and found a rather easy (not so efficient) solution to handle this using jQuery.
Use this function to check the validity of your control:
function validateControl() {
return $('#YOUR_VALIDATOR_ID').css("visibility") == "visible"
if you're using Display="Dynamic" on your validator then the function is like so:
function validateControl() {
return return $('#YOUR_VALIDATOR_ID').css("display") == "inline"
Be sure to check the true ID of your validator if you're using a Masterpage, as it will be different than the one in your IDE. Do so by viewing the page source in your browser.
The best solution will be of course to validate your form in some other way, using JavaScript or a CustomValidator that lets you write your own code.
I have two asp buttons on a single page. In the following format
textbox1
required field validator1
button1
textbox2
required filed validator2
button2
if I keep cause validation on both buttons true, then its not firing the server side click event, but I am able to validate these text boxes using required field validators.
If I keep this cause validation on both buttons false, its firing the server side click event, but I am not able to validate these textboxes using required filed validators
Can you please tell me the best solution
Thanks
CausesValidation should be true on both.
What you need to do is set ValidationGroup Button1Validation on the textbox1 validator and button1. Set a ValidationGroup of Button2Validation on the textbox2 validator and button2.
Validation groups separate validation rules into groups so that the groups don't overlap and interfere with each other.
The default behavior of the RequiredFieldValidator is that when you don't insert something into the textbox to which it's coupled, and client side validation is turned on (defaults to true), then it won't posback and as such the server side event never gets hit.
You can turn off the client side validation on the validator control by setting the property EnableClientScript to false:
<asp:RequiredFieldValidator ID="TextBoxRequiredValidator"
ControlToValidate="NumberTextBox"
EnableClientScript="False"
Display="Dynamic"
ErrorMessage="Please enter a value."
Text="*"
runat="server"/>
Taken from the MSDN documentation.
When I called this function to enable a validator from client javascript:
`ValidatorEnable(document.getElementById('<%=valPassportOtherText.ClientID%>'), true); //enable` validation control
the required validation control immediately performed it validation, found the value in the associated text box blank and set focus to the textbox (because SetFocusOnError was set to true). As a result, the side effect was that focus was shifted to the control that was associated with the Validation control, i teh example, txtSpecifyOccupation.
<asp:TextBox ID="txtSpecifyOccupation" runat="server" AutoCompleteType="Disabled"
CssClass="DefaultTextBox DefaultWidth" MaxLength="24" Rows="2"></asp:TextBox>
<asp:RequiredFieldValidator ID="valSpecifyOccupation" runat="server" ControlToValidate="txtSpecifyOccupation"
ErrorMessage="1.14b Please specify your <b>Occupation</b>"
SetFocusOnError="True"> Required</asp:RequiredFieldValidator>
Perhaps there is a way to enable the (required) validator without having it simultaneously perform the validation (at least until the user has tabbed off of it?)
I'd like validation of the txtSpecifyOccupation textbox to occur only on a Page submit or when the user has tabbed of the required txtSpecifyoccupation textbox.
How can I achieve this?
Don't call the ValidatorEnable method. Instead, get a reference to teh validation control and simply set its "enabled" property as desired.
To clear the validation control's error text, set the innerText property to "".