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ASP.NET client side validation on blur

I have few textboxes and asp.net validation controls on a page. The validation fires when I click on "Submit" button. Is there anyway to fire the validation as soon as I leave the textbox? I would like to do the same validation for other 20+ fields in the form. However, only validating specific textbox when leaving it.
<asp:TextBox ID="txtclass" runat="server"></asp:TextBox>
<asp:RangeValidator ID="rvclass"
runat="server" ControlToValidate="txtclass"
ErrorMessage="Enter your class (6 - 12)" MaximumValue="12"
MinimumValue="6" Type="Integer">
</asp:RangeValidator>
<asp:Button ID="btnsubmit" runat="server" onclick="btnSubmit_Click" Text="Submit" />

Create a js function to perform the validating, then for each textbox you want to validate set the onblur and call that function. (I'm just free writing below so excuse the syntax error but you should get the gist)
function validateClass(val)
{
if(val.value > 5 && val.value < 13)
{
//alert(good!)
}
else
{
//alert(show error?)
}
}
call it in your textbox
<asp:TextBox ID="txtclass" runat="server" onblur="validateClass(this);"></asp:TextBox>

can a required field validator can have two validation groups?

I am working on a web page.
In that web page there are 4 text boxes and each one has required field validator.
The web page has 3 buttons.
on clicking on 1st button 1st & 2nd required field validations should fire.
and on 2nd button 2nd and 3rd required field validator should fire
just like this on 3rd button 3rd and 4th should fire.
The problem is , since the one required field validator is invoked with two buttons i cant have a validation group name .
can anybody please suggest a solution .
it will be really helpful.

You can use JS, where you validate specific groups. For each button create separate validation method.
<script type="text/javascript">
function validateGroup12() {
var g1 = Page_ClientValidate("vgroup1");
var g2 = Page_ClientValidate("vgroup2");
if (!g1 || !g2) return false;
return true;
}
</script>
.aspx edit RequiredFieldValidator and set groups name into ValidationGroup
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="TextBox1" ValidationGroup="vgroup1,vgroup2" Display="Dynamic">

Have two validators, instead of one validator, for Textbox 2 and Textbox 3 with the validation groups properly set to the corresponding button validation group.
Even though this is going to duplicate the validator, this simplifies your logic.
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="TextBox1" ValidationGroup="vgroup1" Display="Dynamic">
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="TextBox2" ValidationGroup="vgroup1" Display="Dynamic">
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="TextBox2" ValidationGroup="vgroup2" Display="Dynamic">
<asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="vgroup1" />
<asp:Button ID="Button2" runat="server" Text="Button" ValidationGroup="vgroup2" />

How do I can get asp:Panel to work properly with asp:RadioButtonList without AutoPostBack?

I'm developping a form page in a WebForms application.
I have a RadioButtonList and a Panel, and I wanted the panel to open when a especific value of the RadioButtonList was selected, how do I do this?
I've tried with AutoPostBack but I didn't like how it worked (running the page again), are there any other solutions?

Some of the places I searched for an answer recommended using the AutoPostBack property, but I personally didn't like it and so I had to find another way for it to work and so I decided to use JavaScript/JQuery...
This is an HTML sample code of an example of a RadioButtonList and a panel that opens when a chosen option on it is clicked (the value "Required" causes it to open and "Not Required" to close in this case):
<div>
<p class="space">3.2. ACCOMMODATION (*)</p>
<asp:RadioButtonList ID="accomodation" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow" Width="500px">
<asp:ListItem Text="Not Required" Value="Not Required"></asp:ListItem>
<asp:ListItem Text="Required" Value="Required"></asp:ListItem>
</asp:RadioButtonList>
<asp:Panel ID="PanelAccommodation" runat="server">
<p>
Number of nights (*):
<asp:RequiredFieldValidator ID="RequiredFieldValidator12" runat="server" ControlToValidate="numberOfNights" ForeColor="red" ErrorMessage="<- Required"></asp:RequiredFieldValidator>
</p>
<asp:TextBox ID="numberOfNights" runat="server" Width="50px"></asp:TextBox>
<ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" TargetControlID="numberOfNights"
FilterType="Numbers" runat="server">
</ajaxToolkit:FilteredTextBoxExtender>
<p>Preferred Hotel:</p>
<asp:TextBox ID="preferredHotel" runat="server" Width="450px"></asp:TextBox>
<p>Preferred Hotel URL:</p>
<asp:TextBox ID="preferredHotelURL" runat="server" Width="450px"></asp:TextBox>
</asp:Panel>
</div>
The Script I used:
$(document).ready(function () {
$("#MainContent_PanelAccommodation").hide("fast");
$('#<%= accomodation.ClientID%>').find('input:radio').click(function () {
var selVal = $('#<%= accomodation.ClientID %>').find('input:checked').val();
if (selVal == "Required") {
$("#MainContent_PanelAccommodation").show("fast");
}
if (selVal == "Not Required") {
$("#MainContent_PanelAccommodation").hide("fast");
}
})
});
In this Script I use the first
$("#MainContent_PanelAccommodation").hide("fast");
to make sure that when the page runs the panel is hidden and will only open when/if "Required" is selected...
Another thing you may struggle with is what ID to put in the function since as you can see the panel ID is "PanelAccommodation", but the ID I use in the function is "MainContent_PanelAccommodation" since that's how it's recognized on your browser (to check this just select the panel's position and inspect element) you'll notice that the ID becomes "MainContent_PanelAccommodation" because it inherits from your asp:Content ContentHolderID...
Hope this helps ;) any questions just ask...

Validation (Page_ClientValidate('mygroup')) returns always true after postback

i have a page which i do some validations , all my validations are client side expected one which it use server validation. So my problem is when i fire the server side validation and the page postbacks, this function Page_ClientValidate('mygroup') return true, so i lose my validation though my required fields aren't.
function DoValidation() { var validated = Page_ClientValidate('NewMemberRequired'); Page_BlockSubmit = false; return validated; }
<telerik:RadButton ID="btnSave" runat="server" Text="Save & Close" OnClick="btnSave_Click" CausesValidation="true"
OnClientClick="return DoValidation();">
//the fields
<asp:RequiredFieldValidator ID="AddressRequired" runat="server" ControlToValidate="Address"
CssClass="ErrorMessage" ErrorMessage="Required"ValidationGroup="mygroup"><asp:RequiredFieldValidator/>
//an other filed with postback=true
<telerik:RadTextBox ID="age" runat="server" AutoPostBack="True" OnTextChanged="age_TextChanged">

read the documentation on using RadButton's client-side events as your approach will not work even if it does not cause errors: http://www.telerik.com/help/aspnet-ajax/button-onclientclicking.html. This can also help: http://blogs.telerik.com/aspnet-ajax/posts/12-08-10/migrating-onclientclick-handlers-from-asp-button-to-telerik-s-asp-net-ajax-button.aspx
Read the documentation on executing custom validation: http://www.telerik.com/help/aspnet-ajax/button-validation-with-postback-confirm.html
Make sure your validation grops are fine because in the provided snippet they do not match
the AutoPostBack=true for a textbox will have it postback when you delete its text, regardless of the validator in this setup
Here is some code that validates well:
<telerik:RadButton ID="btnSave" runat="server" Text="Save & Close" OnClick="btnSave_Click" CausesValidation="true"
OnClientClicking="DoValidation">
</telerik:RadButton>
//the fields
<asp:RequiredFieldValidator ID="AddressRequired" runat="server" ControlToValidate="Address"
CssClass="ErrorMessage" ErrorMessage="Required" ValidationGroup="mygroup">
</asp:RequiredFieldValidator>
//an other filed with postback=true
<telerik:RadTextBox ID="Address" runat="server" AutoPostBack="True" OnTextChanged="age_TextChanged" ValidationGroup="mygroup" CausesValidation="true">
</telerik:RadTextBox>
<script>
function DoValidation(sender, args) {
var validated = Page_ClientValidate('mygroup');
args.set_cancel(!validated);
Page_BlockSubmit = false;
}
</script>
Changes:
proper use of OnClientClicking event
proper ValidationGroups being set
CausesValidation=true for the etxtbox so deleting its text will cause validation and prevent the postback

How disable RequiredFieldValidator in script

I have TextBox with RequiredFieldValidator on my page.
I also have link that calls some simple javascript.
<asp:TextBox ID="TextBox1" runat="server" />
<asp:RequiredFieldValidator
ID="RequiredFieldValidator4" runat="server" ControlToValidate="TextBox1"
Display="Dynamic" />
<asp:LinkButton ID="Link1" runat="server" OnClientClick="DoSomething(); return false;" CausesValidation="false"Text="Do" />
function DoSomething() {
textbox1.val("blah"); }
When user type something into textbox and then delete that text and focus next control - then validator fires.
Then user can use link that adds text using javascript. TextBox1 text is no longer empty but RequiredFieldValidator still shows error message. How to prevent that?

you can use javascript ValidatorEnable function
ValidatorEnable(document.getElementById('<%= ValidatorID.ClientID %>'), true);

I would recommend a CustomValidator here since you do NOT want the normal RequiredFieldValidator behavior. The CustomValidator client method will only run on postback.

The whole point of the validators is that they are to be used for both server side and client side validation.
If you only want to validate on the server side, don't use a validator and simply check that the values are valid and report an error.