client side javascript for VB.net

I have a custom textbox control which I need to be readonly, but i am having trouble posting back the page and retaining the value of the box in a web page.

I read that you could set the read-only via javascript on the client side which allows the values to repost and still gives the appearance of readonly.  I found the sample java code, but I am sure how to call that via the textbox control.  There is a onload option, would that be the best place?

I believe this control is basedon the text box control. HOw would you apply this javascript to the standard textbox control?
red_75116Asked:
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MajorBigDealCommented:
Modifying the field in a client side script will not cause the change to be automatically posted back.  The way to accomplish this is to put the data you want to post back into a hidden field and then load it back to the control on the page load event.  Here is an example:  http://forums.asp.net/t/1428896.aspx/1

You could try to directly modify the viewstate on the client-side so that it would get posted back but that is difficult and error-prone.  Unfortunately, it is not a simple matter of just loading the data into the field on the client-side.
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MajorBigDealCommented:
If you put the data in a hidden field, you can load it back into the control on the page load event.  Example: http://forums.asp.net/t/1428896.aspx/1

You could also actually add your updated info into the viewstate for the control so that .net would persist it for you but I don't recommend that approach.
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Ron MalmsteadInformation Services ManagerCommented:
Why can't you just do ..

textbox1.enabled = false

?
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Rajar AhmedConsultantCommented:
If u set by this,

//txtbox1.ReadOnly=false;

or in

//<asp:textbox readonly="false"

Just remove  those lines

Try by this,
txtbox1.Attributes.Add("readonly","readonly");

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red_75116Author Commented:
I still cannot get this to work.  My application uses a custom textbox called inputfield.  When I add the readonly= true to the below, the field is readonly, but when posting back to the page, the values are lost.

                <ex:InputField runat="server" ID="ifReceiver" Readonly="true" />


I was told if I could make the field be readonly with clientside script, it would appear read only and the postback would still work.

How do I call this javascript?
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red_75116Author Commented:
I was able to get the results I needed via the viewstate.  Thanks so much for the help
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