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From: Jay Woerndle on 8 Sep 2010 11:21
I know this is an old thread, but I just spent 2 days trying to make this work and thought I would save someone else the pain of getting a proper solution. I used older code that I found on the net for a CheckBoxList validator and it worked until the a button was clicked that did an asynchronous update of the updatepanel. The validator I was using also extended the basevalidator class and did an override of the AddAttributesToRender function as well as the OnPreRender function.

What I did to fix it was to replace code in both functions. In OnPreRender, I replaced
Page.ClientScript.RegisterStartupScript(GetType(), "evaluationfunction", javascriptString, true);
with the newer function
ScriptManager.RegisterStartupScript(this, GetType(), "evaluationfunction", javascriptString, true);

In AddAttributesToRender I replaced two functions that look like this:
Page.ClientScript.RegisterExpandoAttribute(this.ClientID, "evaluationfunction", "javascriptFunctionName", false);
with the newer function
ScriptManager.RegisterExpandoAttribute(this, this.ClientID, "evaluationfunction", "javascriptFunctionName", false);
where javascriptFunctionName is the actual name of the javascript function that will be embedded to the aspx page.

Like Bruce said above, these functions are suited to the UpdatePanel where the old ones were not.


> On Friday, December 04, 2009 2:41 PM Nathan Sokalski wrote:

> I have a new validator (inherits from BaseValidator), but it does not always
> work when it is inside an UpdatePanel. When I use it inside an update panel,
> it works fine until I do the first successful submit. After the first
> successful submit, the validator basically acts as if it is no longer there.
> Why could this be happening? Any help would be appreciated. Thanks.
> --
> Nathan Sokalski
> njsokalski(a)hotmail.com
> http://www.nathansokalski.com/


>> On Friday, December 04, 2009 3:04 PM Gregory A. Beamer wrote:

>> Having not tried this, my assumption would be that the intiial state is
>> changed once the submit is done. This means you need a bit of JavaScript
>> to re-activate it.
>>
>> To confirm this, I would consider using Firefox with Firebug, or
>> similar, to debug the AJAX.
>>
>> For IE, you can use Fiddler, but it takes a bit more work as it is an
>> "external" tool.
>>
>> Peace and Grace,
>>
>> --
>> Gregory A. Beamer (MVP)
>>
>> Twitter: @gbworld
>> Blog: http://gregorybeamer.spaces.live.com
>>
>> *******************************************
>> | Think outside the box! |
>> *******************************************


>>> On Friday, December 04, 2009 9:51 PM Nathan Sokalski wrote:

>>> I have never used Firebug or Fiddler before, although I have heard of and
>>> seen them so I do not expect to have any problem using them. However, because
>>> my situation does not involve recieving an error, and I do not know exactly
>>> what is getting changed when I submit, I really do not have any idea where to
>>> start as far as what to look for. Can you help me get started? Thanks.
>>> --
>>> Nathan Sokalski
>>> njsokalski(a)hotmail.com
>>> http://www.nathansokalski.com/


>>>> On Friday, December 04, 2009 10:36 PM bruce barker wrote:

>>>> if your validator is in an update panel, then you have to code it
>>>> correctly. your validator is rendered as a span, and will be replaced
>>>> along with any other dom objects in the panel(s). this means you need to
>>>> rerun init code. if it registers any client script, it must use
>>>> ScriptManager to doit. if it references any $gets(), they must be redone.
>>>>
>>>> -- bruce (sqlwork.com)
>>>>
>>>>
>>>>
>>>>
>>>> Nathan Sokalski wrote:


>>>>> On Saturday, December 05, 2009 12:48 AM Nathan Sokalski wrote:

>>>>> OK, I think that I have confirmed that is my problem. The init script that I
>>>>> need to rerun is a script generated by ASP.NET to set the attributes I add
>>>>> when overriding the AddAttributesToRender method inherited from
>>>>> BaseValidator. This script looks something like the following:
>>>>>
>>>>> var ctl00_cphExampleContent_ctl00 = document.all ?
>>>>> document.all["ctl00_cphExampleContent_ctl00"] :
>>>>> document.getElementById("ctl00_cphExampleContent_ctl00");
>>>>> ctl00_cphExampleContent_ctl00.controltovalidate =
>>>>> "ctl00_cphExampleContent_txtMinimum";
>>>>> ctl00_cphExampleContent_ctl00.errormessage = "You must enter at least 5
>>>>> characters.";
>>>>> ctl00_cphExampleContent_ctl00.display = "Dynamic";
>>>>> ctl00_cphExampleContent_ctl00.validationGroup = "minimum";
>>>>>
>>>>> The script is obviously very simple, but because it is automatically
>>>>> generated, how can I rerun it? Also, because this is a validator that I am
>>>>> creating to be shared between multiple applications and users, I do not
>>>>> actually know whether it will be inside an UpdatePanel or not, so I either
>>>>> need to detect that as a condition in the validator or have code that works
>>>>> in either scenario. Any ideas? Thanks.
>>>>> --
>>>>> Nathan Sokalski
>>>>> njsokalski(a)hotmail.com
>>>>> http://www.nathansokalski.com/


>>>>>> On Saturday, December 05, 2009 2:08 PM bruce barker wrote:

>>>>>> inline script (writer.write) will not work because when the client
>>>>>> script in update panel sets the innerHTML, any script in the html is
>>>>>> ignored by the browser.
>>>>>>
>>>>>> use ScriptManager.RegisterStartupScript to render the script. or as it
>>>>>> looks like you are only setting properties, use
>>>>>> ScriptManager.RegisterExpandoAttribute.
>>>>>>
>>>>>> to work with update panels you must use ScriptManager, not the old
>>>>>> ClientScript.
>>>>>>
>>>>>> -- bruce (sqlwork.com)
>>>>>>
>>>>>>
>>>>>> Nathan Sokalski wrote:


>>>>>>> On Sunday, December 06, 2009 4:29 PM Nathan Sokalski wrote:

>>>>>>> I am sorry, I think I gave incorrect information in my original post. The
>>>>>>> script does not set the attributes set in AddAttributesToRender, it sets
>>>>>>> several expando attributes used by validators (which, as you could probably
>>>>>>> see, in this case included controltovalidate, errormessage, display, and
>>>>>>> validationGroup). But I think you misunderstood what I meant when I said the
>>>>>>> script is generated by ASP.NET. I am not using ScriptManager OR ClientScript
>>>>>>> directly; the script I showed you is added by the BaseValidator class in
>>>>>>> code that I do not see (or at least I do not know where it is), I believe
>>>>>>> that it is a script that is created regardless of what I do. Because I am
>>>>>>> not the one who writes the code that adds this script, where can I go to fix
>>>>>>> my problem (or is there a function and/or property that returns the script
>>>>>>> that gets generated so that I can rerun the script at the appropriate
>>>>>>> time?)? Thanks.
>>>>>>> --
>>>>>>> Nathan Sokalski
>>>>>>> njsokalski(a)hotmail.com
>>>>>>> http://www.nathansokalski.com/


>>>>>>>> On Sunday, December 06, 2009 7:06 PM bruce barker wrote:

>>>>>>>> the .net validators with 3.5 (webextensions.dll) were rewritten to use
>>>>>>>> ScriptManger. I do not know where your validator is from, but you need an
>>>>>>>> update panel aware one.
>>>>>>>>
>>>>>>>> -- bruce (sqlwork.com)
>>>>>>>>
>>>>>>>> Nathan Sokalski wrote:


>>>>>>>>> On Sunday, December 06, 2009 8:11 PM Nathan Sokalski wrote:

>>>>>>>>> I am using Visual Studio 2008 and ASP.NET 3.5, and my validator is one that
>>>>>>>>> I wrote which inherits from BaseValidator (the validator was written using
>>>>>>>>> Visual Studio 2008 and ASP.NET 3.5 as well). Any more suggestions or ideas?
>>>>>>>>> Thanks.
>>>>>>>>> --
>>>>>>>>> Nathan Sokalski
>>>>>>>>> njsokalski(a)hotmail.com
>>>>>>>>> http://www.nathansokalski.com/


>>>>>>>>>> On Monday, December 07, 2009 12:32 PM Gregory A. Beamer wrote:

>>>>>>>>>> Video or text?
>>>>>>>>>>
>>>>>>>>>> There are quite a few links that talk about debugging AJAX on this
>>>>>>>>>> Google search:
>>>>>>>>>> http://snurl.com/tlfyg
>>>>>>>>>>
>>>>>>>>>> The top link is a You Tube video that shows how to do it.
>>>>>>>>>>
>>>>>>>>>> The search (above) is where I would start. if that yields nothing, then
>>>>>>>>>> we can look at other options.
>>>>>>>>>>
>>>>>>>>>> Peace and Grace,
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Gregory A. Beamer (MVP)
>>>>>>>>>>
>>>>>>>>>> Twitter: @gbworld
>>>>>>>>>> Blog: http://gregorybeamer.spaces.live.com
>>>>>>>>>>
>>>>>>>>>> *******************************************
>>>>>>>>>> | Think outside the box! |
>>>>>>>>>> *******************************************


>>>>>>>>>>> On Monday, December 07, 2009 2:49 PM Nathan Sokalski wrote:

>>>>>>>>>>> Actually, I think I have found the source of the problem, as you will see in
>>>>>>>>>>> the response from bruce barker (not that I did not appreciate yours or plan
>>>>>>>>>>> on trying yours also). The problem is the script generated by BaseValidator
>>>>>>>>>>> to set some of the expando attributes for the span tag which is the
>>>>>>>>>>> validator (such as controltovalidate, errormessage, display,
>>>>>>>>>>> validationGroup, etc.). The script works fine, but it needs rerun after the
>>>>>>>>>>> UpdatePanel does one of it is asynch postbacks, which I am having trouble
>>>>>>>>>>> figuring out how to do, since the script is generated and added completely
>>>>>>>>>>> automatically. Any ideas (or if you think the problem could be something
>>>>>>>>>>> else)? Thanks.
>>>>>>>>>>> --
>>>>>>>>>>> Nathan Sokalski
>>>>>>>>>>> njsokalski(a)hotmail.com
>>>>>>>>>>> http://www.nathansokalski.com/


>>>>>>>>>>>> On Wednesday, December 09, 2009 10:26 AM Eric M wrote:

>>>>>>>>>>>> I am having the exact same issue... That code is not being re-run on
>>>>>>>>>>>> the asynch post-back, so when I access the property in client code, it
>>>>>>>>>>>> is undefined.
>>>>>>>>>>>>
>>>>>>>>>>>> in
>>>>>>>>>>>> n
>>>>>>>>>>>> or
>>>>>>>>>>>> he
>>>>>>>>>>>> y
>>>>>>>>>>>> ews:Xns9CDA753184E56gbworld(a)207.46.248.16...


>>>>>>>>>>>>> On Wednesday, December 09, 2009 12:39 PM Nathan Sokalski wrote:

>>>>>>>>>>>>> I found some stuff that says there are updated versions of the validators
>>>>>>>>>>>>> for AJAX that fix this, but those posts were from 2007, and not only is this
>>>>>>>>>>>>> over 2 years later, but I did my stuff with ASP.NET 3.5, and I always get
>>>>>>>>>>>>> all the stuff from WindowsUpdate right away (it says the updates will be
>>>>>>>>>>>>> provided through WindowsUpdate). Here is where I got that info:
>>>>>>>>>>>>>
>>>>>>>>>>>>> http://blogs.msdn.com/mattgi/archive/2007/01/23/asp-net-ajax-validators.aspx
>>>>>>>>>>>>>
>>>>>>>>>>>>> I do not know if the article is wrong or if I do not have all the updates I
>>>>>>>>>>>>> think I do, but maybe this will help us fix everything. Hopefully.
>>>>>>>>>>>>> --
>>>>>>>>>>>>> Nathan Sokalski
>>>>>>>>>>>>> njsokalski(a)hotmail.com
>>>>>>>>>>>>> http://www.nathansokalski.com/
>>>>>>>>>>>>>
>>>>>>>>>>>>> I am having the exact same issue... That code is not being re-run on
>>>>>>>>>>>>> the asynch post-back, so when I access the property in client code, it
>>>>>>>>>>>>> is undefined.


>>>>>>>>>>>>> Submitted via EggHeadCafe - Software Developer Portal of Choice
>>>>>>>>>>>>> Book Review: Excel 2010 - The Missing Manual [OReilly]
>>>>>>>>>>>>> http://www.eggheadcafe.com/tutorials/aspnet/7d211741-221d-46c7-b9c3-d34bf84568be/book-review-excel-2010--the-missing-manual-oreilly.aspx
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