I'm having a really strange problem with and HtmlSelect server control
(listbox) and a RequiredFieldVa lidator that I am trying to use to make sure
that someone has items in the listbox.
The way that the HtmlSelect is populated is via a combination of client-side
javascript and another aspx page (launched by the javascript).
Anyway, everything seems to work just fine in terms of populating the
HtmlSelect. However, when I postback the form, the RequiredFieldVa lidator
always thinks that there is nothing in the HtmlSelect and fails validation
(I am only using server-side validation, by the way). I have the
ControlToValida te and all those things hooked up properly. Is there some
trick to setting the RequiredFieldVa lidator for an HtmlSelect control? Some
property that I am not setting?? I suspect that there is some small setting
that I am missing, but I have spent way too much time on this to keep
struggling.
Any help is appreciated,
Thanks
10  1289 
I wouldn't expect server-side validation to work on client-side added items.
Take a look at: http://openmymind.net/FAQ.aspx?documentId=1
but the quick answer is that when you add items in javascript, they aren't
added to the viewstate which means they won't be recreated on
postback...expl ains why your htmlselect is empty...
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:uM******** *****@tk2msftng p13.phx.gbl... I'm having a really strange problem with and HtmlSelect server control
(listbox) and a RequiredFieldVa lidator that I am trying to use to make
sure
that someone has items in the listbox.
The way that the HtmlSelect is populated is via a combination of
client-side
javascript and another aspx page (launched by the javascript).
Anyway, everything seems to work just fine in terms of populating the
HtmlSelect. However, when I postback the form, the RequiredFieldVa lidator
always thinks that there is nothing in the HtmlSelect and fails validation
(I am only using server-side validation, by the way). I have the
ControlToValida te and all those things hooked up properly. Is there some
trick to setting the RequiredFieldVa lidator for an HtmlSelect control?
Some
property that I am not setting?? I suspect that there is some small
setting
that I am missing, but I have spent way too much time on this to keep
struggling.
Any help is appreciated,
Thanks
OK, this sort of makes sense to me. But, all the documentation that I have
read says that the RequiredFieldVa lidator works with an HtmlSelect server
control. I guess what you are saying is that the items need to be added
server-side for this to work?
Also, if this is the case, then is there a way to add them to the viewstate
in the described scenario or will I have to do some kind of convoluted
CustomValidatio n where I check the Request collection? Based upon the FAQ
below, I am assuming that converting to web controls wouldn't solve the
problem either - this seems to be a client vs server side issue with regard
to how the validation works.
Brian
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:uP******** ******@TK2MSFTN GP14.phx.gbl... I wouldn't expect server-side validation to work on client-side added
items.
Take a look at: http://openmymind.net/FAQ.aspx?documentId=1
but the quick answer is that when you add items in javascript, they aren't
added to the viewstate which means they won't be recreated on
postback...expl ains why your htmlselect is empty...
Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:uM******** *****@tk2msftng p13.phx.gbl... I'm having a really strange problem with and HtmlSelect server control
(listbox) and a RequiredFieldVa lidator that I am trying to use to make
sure
that someone has items in the listbox.
The way that the HtmlSelect is populated is via a combination of
client-side
javascript and another aspx page (launched by the javascript).
Anyway, everything seems to work just fine in terms of populating the
HtmlSelect. However, when I postback the form, the
RequiredFieldVa lidator always thinks that there is nothing in the HtmlSelect and fails
validation (I am only using server-side validation, by the way). I have the
ControlToValida te and all those things hooked up properly. Is there some
trick to setting the RequiredFieldVa lidator for an HtmlSelect control?
Some
property that I am not setting?? I suspect that there is some small
setting
that I am missing, but I have spent way too much time on this to keep
struggling.
Any help is appreciated,
Thanks
Well, it doesn't sound like it has anything to do with HtmlSelect, per se,
validating. It seems like it has to do with the values not being in
Viewstate. If that is the case, then validation would not work with ANY
items that are added to a form via client-side code.
"Patrick Olurotimi Ige" <na********@hot mail.com> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. .. As Karl explained don't expect HtmlSelect to validate
*** Sent via Developersdex http://www.developersdex.com ***
You are pretty much right about everything. Though I would expect the
client-side validation to still work (not necessarily ideal since it only
works in IE...)
-items need to be added server-side
-going to dropdownlist (server control) wouldn't change anything
-you'll need to write your own validator and use request.form
Cheers,
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:O3******** ********@TK2MSF TNGP09.phx.gbl. .. OK, this sort of makes sense to me. But, all the documentation that I have
read says that the RequiredFieldVa lidator works with an HtmlSelect server
control. I guess what you are saying is that the items need to be added
server-side for this to work?
Also, if this is the case, then is there a way to add them to the
viewstate
in the described scenario or will I have to do some kind of convoluted
CustomValidatio n where I check the Request collection? Based upon the FAQ
below, I am assuming that converting to web controls wouldn't solve the
problem either - this seems to be a client vs server side issue with
regard
to how the validation works.
Brian
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:uP******** ******@TK2MSFTN GP14.phx.gbl... I wouldn't expect server-side validation to work on client-side added
items.
Take a look at: http://openmymind.net/FAQ.aspx?documentId=1
but the quick answer is that when you add items in javascript, they
aren't
added to the viewstate which means they won't be recreated on
postback...expl ains why your htmlselect is empty...
Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:uM******** *****@tk2msftng p13.phx.gbl... > I'm having a really strange problem with and HtmlSelect server control
> (listbox) and a RequiredFieldVa lidator that I am trying to use to make
> sure
> that someone has items in the listbox.
>
> The way that the HtmlSelect is populated is via a combination of
> client-side
> javascript and another aspx page (launched by the javascript).
>
> Anyway, everything seems to work just fine in terms of populating the
> HtmlSelect. However, when I postback the form, the RequiredFieldVa lidator > always thinks that there is nothing in the HtmlSelect and fails validation > (I am only using server-side validation, by the way). I have the
> ControlToValida te and all those things hooked up properly. Is there
> some
> trick to setting the RequiredFieldVa lidator for an HtmlSelect control?
> Some
> property that I am not setting?? I suspect that there is some small
> setting
> that I am missing, but I have spent way too much time on this to keep
> struggling.
>
> Any help is appreciated,
> Thanks
>
>
> OK, this sort of makes sense to me. But, all the documentation that I have read says that the RequiredFieldVa lidator works with an
HtmlSelect server control. I guess what you are saying is that the
items need to be added server-side for this to work?
Yes, you're correct. If you look at the javascript emitted when you do have
server side validation controls you'll see there's an array that's initalized
at the bottom somewhere with the IDs of all the client side validation elements.
This is what the client side framework drives off of.
-Brock
DevelopMentor http://staff.develop.com/ballen
I'm still having trouble with this, here is what I have done (I'm not using
client-side validation, by the way - customer requirement):
1) As I mentioned before, everything works fine client-side in terms of
items being added to the HtmlSelect control. I get a nice list of items in
my form, as expected. In addition, I have a hidden input field that holds a
string representation of the values, so that I can persist between
postbacks. For the sake of argument, lets call my HtmlSelect (which is
runat=server) "lstValues" and my hidden input (which is also runat=server)
"hdnValues" .
2) Now, from what I understand, I should be able to truly populate the
HtmlSelect control (as .NET sees it) on the server-side, so that when
validation rolls around in the page event cycle, it will see that items have
been added. This is where confusion sets in.
3) It seems that Page_Init is too early to set any values because
"hdnValues" is always an empty string. So, that doesn't work.
4) I have tried adding IPostbackDataHa ndler to my page and implementing
LoadPostbackDat a, but this doesn't seem to work. The values are set, but the
validation still fails.
5) I have tried adding multiple other events that supposedly occur before
validation and populating lstValues there, but all to no avail. Validation
still fails.
6) I have googled and read everything that I can find, but nothing seem to
work.
This cannot be this difficult. I feel like I have all that I need on the
client-side, I just need to know what to do and where to do it in the
code-behind in order to catch the page event before validation and populate
lstValues with the items that I have. Also, from what I understand (and I
have observed the problem, so I know its true) CustomValidator s don't work
with HtmlSelect - the event doesn't fire, so that is not an option either.
Any help is appreciated, I have been working on this all day....
TIA
BK
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:Ot******** ******@TK2MSFTN GP14.phx.gbl... You are pretty much right about everything. Though I would expect the
client-side validation to still work (not necessarily ideal since it only
works in IE...)
-items need to be added server-side
-going to dropdownlist (server control) wouldn't change anything
-you'll need to write your own validator and use request.form
Cheers,
Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:O3******** ********@TK2MSF TNGP09.phx.gbl. .. OK, this sort of makes sense to me. But, all the documentation that I
have read says that the RequiredFieldVa lidator works with an HtmlSelect
server control. I guess what you are saying is that the items need to be added
server-side for this to work?
Also, if this is the case, then is there a way to add them to the
viewstate
in the described scenario or will I have to do some kind of convoluted
CustomValidatio n where I check the Request collection? Based upon the
FAQ below, I am assuming that converting to web controls wouldn't solve the
problem either - this seems to be a client vs server side issue with
regard
to how the validation works.
Brian
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:uP******** ******@TK2MSFTN GP14.phx.gbl... I wouldn't expect server-side validation to work on client-side added
items.
Take a look at: http://openmymind.net/FAQ.aspx?documentId=1
but the quick answer is that when you add items in javascript, they
aren't
added to the viewstate which means they won't be recreated on
postback...expl ains why your htmlselect is empty...
Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:uM******** *****@tk2msftng p13.phx.gbl...
> I'm having a really strange problem with and HtmlSelect server
control > (listbox) and a RequiredFieldVa lidator that I am trying to use to
make > sure
> that someone has items in the listbox.
>
> The way that the HtmlSelect is populated is via a combination of
> client-side
> javascript and another aspx page (launched by the javascript).
>
> Anyway, everything seems to work just fine in terms of populating the
> HtmlSelect. However, when I postback the form, the
RequiredFieldVa lidator > always thinks that there is nothing in the HtmlSelect and fails
validation > (I am only using server-side validation, by the way). I have the
> ControlToValida te and all those things hooked up properly. Is there
> some
> trick to setting the RequiredFieldVa lidator for an HtmlSelect
control? > Some
> property that I am not setting?? I suspect that there is some small
> setting
> that I am missing, but I have spent way too much time on this to keep
> struggling.
>
> Any help is appreciated,
> Thanks
>
>
Thanks. I'm still having problems with this - I posted the details in a
previous message. Everything on the client side of the house works fine. I
just cannot seem to figure out what to do on the server side to convince
..NET that there is something in the HtmlSelect. I have tried MANY different
ways and all of them fail validation.
"Brock Allen" <ba****@NOSPAMd evelop.com> wrote in message
news:62******** **************@ msnews.microsof t.com... OK, this sort of makes sense to me. But, all the documentation that I
have read says that the RequiredFieldVa lidator works with an
HtmlSelect server control. I guess what you are saying is that the
items need to be added server-side for this to work?
Yes, you're correct. If you look at the javascript emitted when you do
have server side validation controls you'll see there's an array that's
initalized at the bottom somewhere with the IDs of all the client side validation
elements. This is what the client side framework drives off of.
-Brock
DevelopMentor
http://staff.develop.com/ballen
The information will be available in the Page_Load event. It's loaded in
the LoadPostbackDat a event of the individual contorl - not the pages.
Why not just write your own validation event....By the time you get to a
bottom's click event, the data is there, write a function "IsCustomValide ()"
which checks to see if hdnValues has a value?
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:eb******** ******@TK2MSFTN GP14.phx.gbl... I'm still having trouble with this, here is what I have done (I'm not
using
client-side validation, by the way - customer requirement):
1) As I mentioned before, everything works fine client-side in terms of
items being added to the HtmlSelect control. I get a nice list of items in
my form, as expected. In addition, I have a hidden input field that holds
a
string representation of the values, so that I can persist between
postbacks. For the sake of argument, lets call my HtmlSelect (which is
runat=server) "lstValues" and my hidden input (which is also runat=server)
"hdnValues" .
2) Now, from what I understand, I should be able to truly populate the
HtmlSelect control (as .NET sees it) on the server-side, so that when
validation rolls around in the page event cycle, it will see that items
have
been added. This is where confusion sets in.
3) It seems that Page_Init is too early to set any values because
"hdnValues" is always an empty string. So, that doesn't work.
4) I have tried adding IPostbackDataHa ndler to my page and implementing
LoadPostbackDat a, but this doesn't seem to work. The values are set, but
the
validation still fails.
5) I have tried adding multiple other events that supposedly occur before
validation and populating lstValues there, but all to no avail. Validation
still fails.
6) I have googled and read everything that I can find, but nothing seem to
work.
This cannot be this difficult. I feel like I have all that I need on the
client-side, I just need to know what to do and where to do it in the
code-behind in order to catch the page event before validation and
populate
lstValues with the items that I have. Also, from what I understand (and I
have observed the problem, so I know its true) CustomValidator s don't work
with HtmlSelect - the event doesn't fire, so that is not an option either.
Any help is appreciated, I have been working on this all day....
TIA
BK
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:Ot******** ******@TK2MSFTN GP14.phx.gbl... You are pretty much right about everything. Though I would expect the
client-side validation to still work (not necessarily ideal since it only
works in IE...)
-items need to be added server-side
-going to dropdownlist (server control) wouldn't change anything
-you'll need to write your own validator and use request.form
Cheers,
Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"BK" <no*****@hotmai l.com> wrote in message
news:O3******** ********@TK2MSF TNGP09.phx.gbl. .. > OK, this sort of makes sense to me. But, all the documentation that I have > read says that the RequiredFieldVa lidator works with an HtmlSelect server > control. I guess what you are saying is that the items need to be added
> server-side for this to work?
>
> Also, if this is the case, then is there a way to add them to the
> viewstate
> in the described scenario or will I have to do some kind of convoluted
> CustomValidatio n where I check the Request collection? Based upon the FAQ > below, I am assuming that converting to web controls wouldn't solve the
> problem either - this seems to be a client vs server side issue with
> regard
> to how the validation works.
>
> Brian
>
> "Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
> wrote in message news:uP******** ******@TK2MSFTN GP14.phx.gbl...
>> I wouldn't expect server-side validation to work on client-side added
> items.
>>
>> Take a look at: http://openmymind.net/FAQ.aspx?documentId=1
>>
>> but the quick answer is that when you add items in javascript, they
>> aren't
>> added to the viewstate which means they won't be recreated on
>> postback...expl ains why your htmlselect is empty...
>>
>> Karl
>>
>>
>> --
>> MY ASP.Net tutorials
>> http://www.openmymind.net/ - New and Improved (yes, the popup is
>> annoying)
>> http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
>> come!)
>>
>>
>> "BK" <no*****@hotmai l.com> wrote in message
>> news:uM******** *****@tk2msftng p13.phx.gbl...
>> > I'm having a really strange problem with and HtmlSelect server control >> > (listbox) and a RequiredFieldVa lidator that I am trying to use to make >> > sure
>> > that someone has items in the listbox.
>> >
>> > The way that the HtmlSelect is populated is via a combination of
>> > client-side
>> > javascript and another aspx page (launched by the javascript).
>> >
>> > Anyway, everything seems to work just fine in terms of populating
>> > the
>> > HtmlSelect. However, when I postback the form, the
> RequiredFieldVa lidator
>> > always thinks that there is nothing in the HtmlSelect and fails
> validation
>> > (I am only using server-side validation, by the way). I have the
>> > ControlToValida te and all those things hooked up properly. Is there
>> > some
>> > trick to setting the RequiredFieldVa lidator for an HtmlSelect control? >> > Some
>> > property that I am not setting?? I suspect that there is some small
>> > setting
>> > that I am missing, but I have spent way too much time on this to
>> > keep
>> > struggling.
>> >
>> > Any help is appreciated,
>> > Thanks
>> >
>> >
>>
>>
>
>
This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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