ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

Well, this has been under discussion for sometime and I knew this was a known issue although it was a design change in ASP.NET 2.0.

I am talking about the TextBox which has the Read Only property assigned true not retaining the values or client side changes getting ignored across postbacks.  There are certain blogs / articles which talk about it but for the benefit of those who get stuck with this, I am giving herebelow the steps to reproduce and the resolution for the same.

ASP.NET 2.0 had a design change by which a an <asp:TextBox> control if marked with its ReadOnly property as true, would ignore client side changes and would lose the same across postback.  So if you tried modifying the text box value or add a value to the text box using Javascript you wouldnt be able to retireve the value in the code behind or simply the value will be lost across postback.

Try doing this

Declare a TextBox

<asp:TextBox ID="TextBox1" runat="server" Text="Sample Text" ReadOnly="true" />

Add the following Button

<asp:Button ID="Button1" runat="Server" Text="Submit" OnClick="Button1_Click"  />

The purpose of the above button is to invoke a code behind method, the click event where we can do a Response.Write of the TextBox value.

So, in the code behind, add the following method

    protected void Button1_Click(object sender, EventArgs e)
    {
              Response.Write(TextBox1.Text);
    }

then add the following button

<input type="Button" name="Button2" onclick="changevalue()" />

The purpose of the input type button is to execute a client side javascript.

The client side script is as follows:-

 <script language="javascript">
        function changevalue()
        {
        this.form1.TextBox1.value = "Modified Sample Text";
       
        }
   
    </script>

Place the above script before the </head> tag in your HTML Source.

Now, if you click on the input type button you will see that the TextBox value changes to "Modified Sample Text". 

However, when you click on the button "Submit" which is an <asp:Button>, a server control, you will see that the text that it writes to the browser is again "Sample Text".  You will also see that the TextBox has the value reset to "Sample Text".

This behaviour is new in ASP.NET 2.0 and if you are migrating your ASP.NET 1.x applications you may find this a little annoying / worrying since the values aren't retained.

This is independent of whether you set the EnableViewState property for the TextBox to true or false.  In fact the EnableViewState property for a TextBox doesnt make a difference since the values in a TextBox are maintained and retrieved from the Form's Collection and not from the ViewState.

However, there is a work around for the same.  Instead of setting the "Read Only=true" property in the design you can enable the ReadOnly property of the TextBox through the Attributes collection in the code behind.  To do that, remove the ReadOnly property from the TextBox declaration above.  Then, in the code behind file, within the Page_Load add the following line of code:-

TextBox1.Attributes.Add("readonly", "readonly");

Now you will notice that when you run the page, the client side changes you make in the TextBox (via the Javascript) is retained across postback.

This behaviour is by design in ASP.NET 2.0 and it has been designed with the idea that a ReadOnly TextBox shouldnt be modified in the client side by a malicious code.

For more information check http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.readonly.aspx

Cheers !!! 

Print | posted on Thursday, May 10, 2007 9:23 AM

Comments on this post

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Kudos! Although I haven't had this problem personally, I was thinking the same solution while reading about the problem.
Left by Shadowin on May 10, 2007 10:40 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Really helpful post! :)
Left by butchi on May 22, 2007 6:04 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Absolutely brilliant. I've been messing around with this problem all afternoon, migrating a .NET 1.1 app, and was at the point of giving up and letting the use edit the text when I didn't want them to.

Thanks for the article, and it was even the first site that came up when I finally googled the problem.
Left by Craig on Jun 28, 2007 7:30 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Excellent!!!
Thank you!!

I searched for quite a while on this and this was the only post I found that both explained the problem and gave a simple solution.

thank you again
t
Left by Troy on Jul 02, 2007 4:50 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Great !

thank you very much.
Left by molecule on Jul 06, 2007 7:53 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks Buddy. One can never have too much appreciation.
Left by Sammy on Jul 18, 2007 4:19 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Excellent post.
Saved me likely 2 hours of Googling for an answer!
Left by Dan Bishop on Sep 18, 2007 8:50 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Dear,
You have given the exact solution which is very rare on net.
Thank u very much.May ALLAH enhance your knowledge.
Left by Tahir on Dec 13, 2007 12:23 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks a lot for putting me out of my misery. I, too, had to port a .NET 1.1 app to 2.0 and ran up against this problem. The app consisted of 100's of pages, and in order to patch them all quickly I devised the following solution which someone else might find useful:

Create a global class in your App_Code folder, e.g. Net2Util.cs with the following content:

////////////////////////////////////////
using System.Web.UI;
using System.Web.UI.WebControls;

//use your own namespace!
namespace MABS.App_Code
{
public class Net2Util
{
public static void clearReadOnlyTextboxesForNet2(Page pg)
{
foreach (Control c in pg.Form.Controls)
{
if (c.GetType().ToString() == "System.Web.UI.WebControls.TextBox" && ((TextBox)c).ReadOnly)
{
((TextBox)c).ReadOnly = false;
((TextBox)c).Attributes.Add("readonly", "readonly");
}
}
}
}
}
////////////////////////////////////////

Then you can call this from any page's Page_Load as follows:

///////////////////////////////////////
protected void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
MABS.App_Code.Net2Util.clearReadOnlyTextboxesForNet2(this);
}
}
///////////////////////////////////////

Hope this helps!
Tian
Left by Tian on Dec 13, 2007 6:35 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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thanks for this brilliant idea.I got my solutions.This is very easy way to handle the problem.thanks again.
Left by Gp on Dec 17, 2007 9:14 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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DUDE!!!! YOU SAVED MY CLIENT, MY COMPANY AND MY JOB!!!!!! LOTSA LOVE N BEST WISHES FOR SHARING THIS WONDERFUL BIT OF KNOWLEDGE!
Left by DEBADEEP on Dec 18, 2007 10:53 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks a lot man ..... i cant tell, how usefull this is. i cant find any article on this issue anywhere ...and it resolved most of my miseries thanks a lot yaar
Left by Saurav Nimesh on Dec 19, 2007 5:23 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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If read only text box does't have viewstate how is it attaining the originally set value upon post back?
Left by N.S.A.Sharma Pendyala on Dec 23, 2007 7:23 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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That was very useful. That works for text boxes. But what if you have a HiddenField whose value is changed by client script? I've noticed that those lose value just like a readonly textbox.
Left by B on Jan 03, 2008 8:32 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Very good article and detailed description
Left by Hemant on Jan 29, 2008 8:52 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Damn, I was doing SQL Profile Queries, million break points, etc and was going nuts. THANKS SO MUCH!! I just wish I googled earlier!
Left by Spartan on Feb 06, 2008 3:15 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks for a helpful trip!
Left by Pushp on Feb 10, 2008 5:15 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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thanks for this very gooooood solution....
Left by jar on Feb 28, 2008 5:39 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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thank you for the tip..
very useful
Left by Magesh on Mar 07, 2008 8:18 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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it was good. used the subject above in my site
and it really looks very meaningful
Thanks
Left by praveen on Mar 09, 2008 8:01 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thank you soooo much! I am working on upgrading an application from VS2003 to VS2008 and have been struggling with this for 2 days. I finally "googled" on the right text and found this article. It was exactly what I needed.
Left by Kyle Woodhouse on Mar 12, 2008 3:35 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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css textboxt ınput (textfield) style - examples - -
http://www.css-lessons.ucoz.com/textbox-css-examples.htm
Left by chester.. on May 23, 2008 3:56 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Awesome it worked for me. great posting
Left by Gore on May 30, 2008 2:05 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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HI i need your help i really want to create my own website/web page but i dont know how to go about doing it so can you please help me out
Left by xxcemil on Jun 06, 2008 10:34 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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What about using the image control? do you have a workaround for this?
Left by jacksoft on Jun 24, 2008 2:14 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thank you very much! :)
Left by calebhc on Jun 24, 2008 6:49 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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just one question! imagine that i have an important field/ textbox that is read-only.

Now if i go, in run-time, for example, with ie developer toolbar and select that specific textbox and delete the read only property making that textbox editable, and after this, insert new data i can read the new and inconsistent data in server !?

Am i missing something ?

Thanks

Left by Paulo Pereira on Jul 06, 2008 10:47 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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why are you copying the work around provided by http://aspadvice.com/blogs/joteke/archive/2006/04/12/16409.aspx ( dates back to 2006 )

Surely you have done your own homework on google and his blog post is the first post on this topic. Really hard to miss :

http://www.google.com/search?hl=en&q=asp.net+readonly+textbox+postback&btnG=Google+Search

Not very nice is it ? At a minimum, you should provide a link back to his post (crediting him).

Left by Alessandro on Aug 07, 2008 12:08 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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nice work
Left by kisha on Aug 18, 2008 7:13 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Good observation and nice workaround. Thanks.
Alternative to above solution.
Change control type to input type=text and set readonly=readonly at the design time.
This need not be a better solution, just another workaround.
Left by Saurabh on Aug 19, 2008 10:42 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thank you!! I was looking for a solution and this is perfect!!
Left by Roman on Aug 26, 2008 7:59 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Good stuff! Helped me out today! Thank you!!!
Left by raz0rf1sh on Sep 04, 2008 6:53 AM

# How i can give onclick event to asp.net text box

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plz, help me
Left by jitu on Sep 08, 2008 2:44 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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add this property to your form declaration.

submitdisabledcontrols="true"
Left by UstesG on Sep 12, 2008 6:53 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thank you! Workaround should be integrated in the .Net framework (extra property).
Left by Jeroen on Oct 23, 2008 4:40 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Fantastic absolutely great !!!
Left by Guest on Nov 19, 2008 12:57 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Great! You helped me! Thank you!
Left by Edgar Iván on Dec 05, 2008 2:10 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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it's helpfull for me
Left by arjun balip on Jan 04, 2009 12:35 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Hi,
This is not true. If enableviewstate is set to false then text box does not maintain it's value.

Why it's maintaining value in your case as you have defined in design time.

Just declare the text box with readonly property

<asp:TextBox ID="TextBox1" runat="server" ReadOnly="true" EnableViewState="false" />

Set this text box value in the page load (In isPostback section) and now click on the button which does the post back. Your textbox value is lost...


Left by Virendra on Jan 23, 2009 3:35 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Hi,

Thank you...u saved my life...
i have been working on this issue for so many hours..
ur article did the trick...

Thanks a lot..
Left by Pavan on Jan 28, 2009 5:48 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Hi,
thanks for this brilliant idea.I got my solutions.This is very very easy way to handle the problem.with out java script thanks again.
Left by Biru on Feb 19, 2009 3:28 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Really very helpfull link yaar...
Left by Mahesh on Mar 03, 2009 4:44 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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This, this was helpful! I had a problem with certain dynamically calculated values not being stored to the DB - on postback. Your solution worked great!

Thanks! :-)
Left by Nirav Doshi on Mar 29, 2009 2:05 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks, this was very helpful for me.
Left by R.Dhandapani on May 29, 2009 1:05 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Does anyone else get the idea that Microsoft touts any bugs in Visual Studio as "by design" and "to avoid malicious attacks"?
Left by Willem on Jun 15, 2009 9:44 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Its a great help. I was having this in my application and causing me headaches.
Left by Karan on Jul 21, 2009 8:52 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks for this. I'm the CIO of a Fortune 5 corporation and we almost lost our biggest client over this very issue. If one of our developers hadn't found this page, our company would be pretty much gone by the end of this quarter.

I literally had a gun barrel in my mouth just a moment ago.

THANK YOU THANK YOU THANK YOU!
Left by Some Guy on Jul 30, 2009 3:00 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Excellent...Saves lot of time...
Left by Rajan on Aug 05, 2009 1:41 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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this post was very help full for me.
thank you very much
Left by Balakrishna on Aug 17, 2009 2:11 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Interesting,

but I like to see an event added to textbox events something like -> ontextchanging , that fires when text is going to change not when the focouse of the control is gone llike on changed event

Thanks for writing about it
Left by web development company on Aug 27, 2009 9:30 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks alot yar i wasted almost 3 hours to resolve this prob..............
Left by Suresh Padaga on Sep 25, 2009 2:56 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Now you will notice that when you run the page, the client side changes you make in the TextBox (via the Javascript) is retained across postback.

This behaviour is by design in ASP.NET 2.0 and it has been designed with the idea that a ReadOnly TextBox shouldnt be modified in the client side by a malicious code.
Left by corvette car seats on Oct 31, 2009 6:12 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thank you so much. Dot Fire :)
Left by Megatrony on Jan 06, 2010 2:45 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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excellent tips :D

Left by limz on Feb 16, 2010 4:43 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Control Name - Blank Text Box
Requirement - To allow the input of text by user

Developer Excuse for Unacceptable Project

This behaviour is by design in ASP.NET 2.0 and it has been designed with the idea that a ReadOnly TextBox shouldnt be modified in the client side by a malicious code

Is the developer still employed?

concerned career follower

Until today concerned career follower was the UI developer, and responsible for validating input and input values to remove the risk of un authorised access attempts.
When will the lunacy end?
Left by John Clark on Feb 18, 2010 1:00 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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but I would like to see an event added to something like that happened TextBox -> ontextchanging, which fires when the text will not change when the control focouse went on llike event has changed
Left by free psn cards on Feb 18, 2010 1:28 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Perfect. Just hit this one today for the first time.
Left by Rubber baby buggy bumpers on Mar 11, 2010 1:04 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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only works when done in page load or loadcomplete...if you try setting these things in client side, you'll will loose changes after each asnyc or whatever...well i guess this is a work around.
Left by notsmart on Mar 25, 2010 3:47 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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thanku so much...vry helpful article
Left by jyoti on Mar 28, 2010 4:28 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Exactly what I was looking for. Thanks!
Left by Kramii on Mar 29, 2010 10:38 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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U should set "submitdisabled control" property of ur form tage as true.
Left by raju on May 04, 2010 12:29 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Excellent. Thanks.
Left by cancu on May 05, 2010 12:22 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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This is really great..i got wonder..
Left by satheesh m nair on May 19, 2010 8:10 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Great. I look forward to playing around with these.
Left by pay day on Jun 08, 2010 7:29 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Works perfectly! Many thanks
Left by Fred on Jul 13, 2010 9:29 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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thanks very nice ................
Left by sanjay on Jul 21, 2010 7:14 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thank you very much. I was breaking my head thinking what is going on?
Left by Vikas Goel on Jan 26, 2011 8:34 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Lets say that I have a textbox with readonly="readonly" set on the rendered html page say by using TextBox1.Attributes.Add("readonly", "readonly"); as you propose and I have javascript that is supposed to calculate its values. Then will the server be aware of that and catch if the page has been tempered i.e. if someone rebuilds the site and resubmit it by manually inserted values in which case I would get wrong calculations.

Hope you will not find me paranoic :)
Left by ILIIA on Jan 27, 2011 5:25 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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And yes, for the sake of a pleasent comunication I should say Thank you. I was just a little over focused
Left by ILIIA on Jan 27, 2011 5:29 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Good stuff! Helped me out today! Thank you!!!.u saved my time a lot.
Left by venu on Feb 15, 2011 1:12 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Nearly four years on, still useful! Thanks.
Left by PJ on Apr 14, 2011 3:33 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Thanks for posting this - Very useful!
Left by Simon on Jun 22, 2011 12:51 PM

# i am taking two webpages named as w1,w2 both having textboxes i want to display w1 values to w2 textboxes

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help me
Left by lakshmi on Sep 13, 2011 10:50 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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add the following code on pageload
its working fine.

TxtdateofPurchase.Attributes("onfocus") = "this.blur();"
TxtWarrontyStartdate.Attributes("onfocus") = "this.blur();"
TxtWarrontyEnddate.Attributes("onfocus") = "this.blur();"
TxtFaultdate.Attributes("onfocus") = "this.blur();"

Me.TxtdateofPurchase.Text = Request(Me.TxtdateofPurchase.UniqueID)
Me.TxtWarrontyStartdate.Text = Request(Me.TxtWarrontyStartdate.UniqueID)
Me.TxtWarrontyEnddate.Text = Request(Me.TxtWarrontyEnddate.UniqueID)
Me.TxtFaultdate.Text = Request(Me.TxtFaultdate.UniqueID)
Left by farid on Sep 18, 2011 3:14 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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best post.tnks
Left by javad on Dec 07, 2011 11:47 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Good one !! Very useful!!
Left by Neelam on Dec 13, 2011 10:58 AM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Excellent Blog, Very userfull
Left by Dafy on Dec 27, 2011 1:43 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Very Nice Blog!!!
Very Useful!!!!!!!!!!!!!!
Left by Netra on Jan 20, 2012 3:08 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Very, very, very useful!

Thanx!
Left by Timoty on Jun 14, 2012 3:35 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Its really helpful...Thanks
Left by Vna on Dec 19, 2012 2:59 PM

# re: ASP.NET 2.0 TextBox Ready Only losing client side changes, values across postback?

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Excellent, Awsome. you are the man. i been messing around for three days. you solved my problem just in one minute.you are genious.
Left by nizam on Jan 30, 2013 12:38 AM

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