Validation Controls in .NET ( Client side or server side?)

 i have a very basic question. We have all these validation controls in ( required field, range validator and others)..

my question is the required field validator is a server side control. So does that mean that it does a post back? it client side or server side control 

10/1/2007 8:48:31 PM 93655 articles. 3 followers. Follow

3 Replies

Similar Articles

[PageSpeed] 7

The only controls that post back are buttons and other inputs where you set AutoPostback="True", such as a dropdownlist or a textbox.  Another way of posting back is using an UpdatePanel and placing a trigger in it for a specified control and/or event.

All controls are considered client controls because the control is rendered as html to the client's browser. 

Server controls are any controls that have runat="server" in their tags.  This means that the control will have an object created to represent it in the code-behind, whether it is an ASP.NET webcontrol or a standard HTML control (which ASP.NET will render an HTMLControl object for).


The validators do not post back.  The validators can be configured to emit javascript on the client's end, so validation can take place without posting back to the server, but you should still validate the page on postback before running any code. (Hackers can change javascript, so the javascript is only there as a convenience to the user-- you still need a safety net at the server.)

Before executing code from the control that posted back, check the Page.IsValid property to make sure that it is true.

MCP - Web Based Client Development .NET 2.0
10/1/2007 9:54:24 PM
Thanks for your reply.
My question then is that if validation controls are client side controls then why do we have to put runat="server"
Does that mean that validation controls can work both client side and server side.

Also i have noticed that If i turn off the JavaScript then these validation controls become useless.
Is there a way to check if client side JavaScript is turned on? or how can use the Page.Isvalid property.

Thanks again
10/2/2007 1:22:38 PM

We put "runat=server" as it is a server control. Do you see the same tag in the HTML of the Page? NO. The tag being runat=server is processed by .net and converted into the necessary javascript and HTML code which saves you from writing all that code by yourself.

Q. Validators work on server side or client side.
A. Actually they are meant for both the sides. Validators have a property "   EnableClientScipt" which by default is True. If you set it as false the validaton would occur server side only (which always takes place). And the reason is that it might be that the browser doesn't support javascript so in that case client side validations will fail but your validators execute on server side as well so that they execute the task they are intended to.


Hope I was able to relax your confusion to some extent :) 



I compete with myself to motivate me!!

Do not forget to mark posts, that help you, as "Answer".
10/2/2007 1:32:24 PM

Similar Artilces:

validation, is it better to have client side or use server side validator controls
 Hi All. I want to do validation on text boxes etc. Is it better to do client side validation or just use the server side validation controls?   Hi!  If for server side controls you mean RequiredFieldValidator, CompareValidator, RegularExpressionValidator, etc.. i can tell you that they use client and server validation. For instance if you use a RequiredFieldValidator, on the client will be a validation, but on the server this condition will be evaluated again. Probably one of the objetives of this is deal with client with javascript disabled. Of course I ...

form double validation- server side and client side
Hi! I would like to make a server side validation after calling a js function that makes the client-side validation. I do not understand couple of things: 1. Do i need a server side button or  a simple HTML submit button in order to call both of the tests? 2. How do i call a server side function which is written in csharp  after i finish my JS validation (the submit  button is calling the JS function for validation first.)- is it possible to call it directly from a js function? 3. I know that my toolbox on  contains validation controls who probably are b...

Jscript, moving from client-side to server-side (.NET)
Hey all I’m working translating a web-app written in client-side Jscript to run on the server-side as JScript.NET. Without needing to get too specific, I am using Jscript because the original page aggregated raw data to produce statistical results (this was done dynamically based on user 'sort-by' options). The final output is an html report that can be emailed. Because this is currently being done on the client side, as the raw data grows the load-time grows as well (to the point that has almost become unusable). I’m posting here to see if anyone has any experi...

When to use client side varidation and server side varidation in .net?
In .net or classic web application we can varidate user data either on client isde or server side. How to select which side varidate to be used? Thanks! Generally, I use both client and server validation. I make sure the input is in the correct format and reasonably valid on the client, then I verify the data on the server. The extent of validation also depends on the type of data that I need to validate.Here are a few references:Validating ASP.NET Server ControlsIntroduction to Validating User Input in Web FormsClient-Side Validation for ASP.NET Server ControlsSecurity Checklist...

web forms with client and server side controls??
Hi, I have a form that has client and server side controls. I have a problem in that any client controls (textbox) within the form runat="server" can not be accessed with client side code. Anyone got any ideas why and what work arounds are possible. Regards, Graham. once a form element is inside a <FORM> tag, you can no longer refer to it by its ID alone. you have to refer to it by formname.elementid or document.all.elementid. use document.getElementById(yourtextboxid) to get a ref to the element in the form. using this allows u to bypass the formn...

communication between client side(java script) and server side in .net project
I have a question which is, when building a .net project, we are able to use server side code and client side code(java script). How do they communicate? Thanks Client Side coding works with the WebBrowser. So when ever you write client side code you have to keep browser compatability in your mind and you have to code. Server Side code works with Web Server (IIS) and it's ASPNET ISAPI's. The won't directly communicate with each other. But using AJAX you can all server side code from Client Side! Example article on Ajax@

Server side validation affecting client side validation
Hi there I have some client side validation that is working fine and enables/disables buttons based on user selections. This works great. However, when I perform server side validation using custom validators (like checking if the user has entered < HTML > tags or decimals in the integer boxes) and the server side validation returns isValid = false then all of the JavaScript validation that I've already done when the user clicked each control is lost. I don't understand why the enabled/disabled state of the control is not maintained.  What is calling the JavaScr...

client side validation vs server side validation
hello  i see a web form that consists of three controls :textbox,requiredfieldvalidator that weired to the textbox and a button within the click event of the button there is the following: if page.isvalid then response.redirect("Page is valid") else response.redirect("Page is not valid") end if according to my understandings: when the user does not fill anything in the textbox and then clicks the button the the page will not be submitted (i.e no request to the page will be happened or no postback will be happened) then no server event will be happened so it is sure when the us...

Combining a server-side control with a client-side control!
Hi all, I am trying to combine a server-side control with a client-side control. I have created a listbox in both sides, the client-side control's code is: <select size="4" name="lstFruit" id="Select1" ondblclick="lst_dblClick" visible="false"> <option value="Banana">Banana</option> <option value="Apple">Apple</option> <option value="Mango">Mango</option> <option value="Orange">Orange</option> </select> The other one is the server-side control which has this code:   I wanted to add the ondblClick attribute to the se...

What are diff Server-side control and Client-side control ?
What are diff Server-side control and Client-side control ? and diff server -side coding and client -side coding ? please help I have answered the first part of your question in your previous posting. Server-side coding languages are ASP, ASP.NET, PHP, CGI (Perl) and many, many more. They are used to create dynamic web content (based on additional information that is attached to the request) and are often used to extract information from databases. Client-side coding languages are JavaScript, VBScript, EMACScript and are used to create dynamic content that responds to the u...

Server Side Validation vs Client Side Validation
If your page is using client side validation for required fields, expressions, etc.     What are the benefits or disadvantages of using 'extra' server side validation for max lengths, parsing, etc? Both have their Advantages and Disadvantages... so give this a read Regards,Vinz"Code, Beer and Music" that's my way of being a programmer!How to get your Forum Question Answered | Blog | CodeASP.NET hi there, advantage: because you are using javascript some browsers for any reason may not sup...

server side controls in a non-server side form
I want to use server side controls in a non-server side form.I use server side controls (like dropdownlists) so I can fill them with the right options from the database.My question is, what is the best way to approach this?CAN I use server-side controls in a client side form? If so, how can I get the values contained in the controls when I do a post? (not in a querystring).Here's a sample of my code: <form id="frmAdvancedSearch" method="post" action="advancedSearch.aspx"> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <input type="submit" /> </form>...

Client Side validation of Calendar control prior to server side selectionchanged event code
Hello, Any thoughts or suggestions regarding this will be greatly appreciated. I have a Calendar control with the validation constraint(can't enter appointments on Holidays or on Thursdays). To create a smoother experience, I'd like for this to be done client side. The dillema is how can I intercept or precede the <asp:calendar> controls selectionchanged event from firing and run my client javascript; passing it to the server if validation succeeds for more intensive processing and database activity. The clientside javascript will need the selected date to deter...

avoiding redundant server-side validation after client-side validation
I see an inaccurate validation behavior on my (2.0) form. The EnableClientScript property of my validation control is set to True by default, so it performs the validation on clientside. But as soon as this occurs, it also performs the server-side validation, so the page refreshes. When the validation error occurs on clientside, it should not do the validation on serverside (I'm not calling Page.Validate() or doing Page.IsValid). In my past experience, handled this automatically, but I guess it's not always the ca...

Web resources about - Validation Controls in .NET ( Client side or server side?) -

Cross-validation (statistics) - Wikipedia, the free encyclopedia
is a model validation technique for assessing how the results of a statistical analysis will generalize to an independent data set. It is mainly ...

Serena Williams eyes history, Caroline Wozniacki craves validation in women's US Open final
As Serena Williams eyes another slice of tennis history, Caroline Wozniacki is craving validation with a watershed US Open final triumph on Sunday ...

Travers Duncan asks High Court to strike down ICAC validation laws
ICAC could be sent back to the High Court as a challenge to new laws validating corruption findings looms.

Adam Scott proclaims Texas win as validation of No.1 ranking
... No.1 golfer, beating American Jason Dufner in the third hole of a play-off at the Colonial event. "It's a good feeling and maybe some validation ...

Hollande to sign gay marriage bill after Constitutional Council's validation
Hollande to sign gay marriage bill after Constitutional Council's validation People's Daily Online ... 26, 27, 28, 29, 30, 31. Jan, Feb, Mar, ...

Marketers, Get Ready for the 'Validation Era'
The public brands included has been engaging in a "friends" arms race. But there are signs that we know we overdid it.

Validation and Uncertainty
What an extraordinary conversation I had recently on Twitter. It started with Neil Killick’s statement that we should not consider our stories ...

Nvidia Icera 410 LTE Modem Passes AT&T Network Validation
... Today's news is a small step and logical precursor toward both goals, Nvidia's Icera 410 LTE and HSPA+ baseband has passed AT&T's network validation ...

Ting’s Q1 Subscriber Growth Suffers from Sprint’s New Unlocking Validation Process
Back in February, Sprint updated the process it uses to validate unlocked devices that customers want to utilize on other carriers or one of ...

[Android M Feature Spotlight] Stricter APK Validation Now Actually Checks If All Of An APK's Files Are ...
While you might file this one under "really? We weren't doing this already?" if you're a security expert, Google has added stricter validation ...

Resources last updated: 11/25/2015 6:10:36 PM