> Hello everybody,
>
> I am generating a dynamic web form based on the options in database that are
> set by the admin (sort of a survey form). On the page load event, it loop
> through the database values and generate different types of controls like
> Label, RadioButton, TextBox etc. in a Repeater control like
> rptQuestionsHTML.Controls.Add(SomeControl).
>
> On the click of a button, I am trying to read the value in a
> programmatically generated control but unable to find the control.
>
> controlID = rptQuestionsHTML.ID.ToString() + "_" + "optAnswer_" +
> dtAnswerChoice.Rows[i]["ID"].ToString().Trim();           
> answerRadioButton = (RadioButton) Page.FindControl(controlID);
> isChecked = answerRadioButton.Checked;
>
> The value the controlID has is present in the HTML source of the page but
> the FindControl method returns nothing to the radiobutton object
> answerRadioButton.

"Robert Bernhardt" wrote:

> usamaalam schrieb:
> > Hello everybody,
> >
> > I am generating a dynamic web form based on the options in database that are
> > set by the admin (sort of a survey form). On the page load event, it loop
> > through the database values and generate different types of controls like
> > Label, RadioButton, TextBox etc. in a Repeater control like
> > rptQuestionsHTML.Controls.Add(SomeControl).
> >
> > On the click of a button, I am trying to read the value in a
> > programmatically generated control but unable to find the control.
> >
> > controlID = rptQuestionsHTML.ID.ToString() + "_" + "optAnswer_" +
> > dtAnswerChoice.Rows[i]["ID"].ToString().Trim();           
> > answerRadioButton = (RadioButton) Page.FindControl(controlID);
> > isChecked = answerRadioButton.Checked;
> >
> > The value the controlID has is present in the HTML source of the page but
> > the FindControl method returns nothing to the radiobutton object
> > answerRadioButton.
>
> Hi.
>
> try to use "rptQuestionsHTML.UniqueId" instead of "rptQuestionsHTML.ID".
>
> rb
>

"Robert Bernhardt" wrote:

> usamaalam schrieb:
> > It doesn't work, basically whether I use rptQuestionsHTML.ID or
> > rptQuestionsHTML.UniqueId, the control Id generated is present on the page(I
> > can see the control by viewing the page source) but it doesn't get the
> > control programmatically.  The reason I think is on the click of the button,
> > form posts back and the controls that were generated programmatically are now
> > gone because on every post back, we have a set of different controls on the
> > page.
> hi,
>
> you must also append the controls on postback and than you can iterate
> the repeater items to get all included controls.
>
> rb
>

"usamaalam" <usamaa***@discussions.microsoft.com> wrote in message
news:DDC9B9FB-A90E-42CC-9D94-C0C7B3700564@microsoft.com...
> How can I append controls on postback?  Can you give an example?
>
> Let me explain you the scenario.  I need to generate a multi-page survey
> form on a single page.  Why I need to use single page because there is no
> specific page size.  Survey creator specified that I want to expand the
> survey on say 5 pages.
>
> Now what is happending right now is that when the survey page is called,
> it
> first fetches data from the database on what questions need to be
> displayed
> on the first page and what possible answer choices for each page (i.e.
> textbox for text type questions, checkboxes for multiple choice questions
> etc.) and generates the form for the first page.  This whole process goes
> on
> Page_Load event and it works fine.  Now there's a button on the page which
> we
> call Next button.  On the click of Next button, old form is saved and the
> form for page 2 is generated and so on.  When the button is clicked,
> Page_Load event is fired before Button Click event.  Page_Load event
> explicitly fires button click event before generating the page 2 form and
> sets a flag variable so that the Click event will not fire again.  When
> the
> Click event is fired by Page_Load event, we cannot get the controls even
> the
> controls collection has 0 controls in it so it gives Object reference not
> set
> to an instance of an object exception.
>
> What I need to do is when the click event is fired from Page_Load event, I
> want to get the values of the previous dynamic controls and save them in
> database before generating the next page.
>
> Thanks a lot.
>
> "Robert Bernhardt" wrote:
>
>> usamaalam schrieb:
>> > It doesn't work, basically whether I use rptQuestionsHTML.ID or
>> > rptQuestionsHTML.UniqueId, the control Id generated is present on the
>> > page(I
>> > can see the control by viewing the page source) but it doesn't get the
>> > control programmatically.  The reason I think is on the click of the
>> > button,
>> > form posts back and the controls that were generated programmatically
>> > are now
>> > gone because on every post back, we have a set of different controls on
>> > the
>> > page.
>> hi,
>>
>> you must also append the controls on postback and than you can iterate
>> the repeater items to get all included controls.
>>
>> rb
>>

"gerry" wrote:

> 2 issues :
>
> 1)  to get the data out of dynamic controls on post back , in the Init
> method ( usually ) , you have to rebuild the page's controls exactly the
> same way they were built when the page was served.
> Of course you could always forget about the controls on postback and parse
> out the request variables yourself to get at the posted data.
>
> 2) the problem you are having is, IMO, a problems with where you are doing
> things, the page dynamic controls should be built in the PreRender not
> OnLoad.
> OnLoad should be used to deal with the page being posted whereas PreRender
> should be used to build the page being served.
>     OnInit - postback - rebuild page controls for page being posted
>     OnLoad - postback - save posted data etc
>     OnButtonClick etc ... handle posted page events
>     PreRender - build controls for page being served.
>
>
> Gerry
>
>
>
>
> "usamaalam" <usamaa***@discussions.microsoft.com> wrote in message
> news:DDC9B9FB-A90E-42CC-9D94-C0C7B3700564@microsoft.com...
> > How can I append controls on postback?  Can you give an example?
> >
> > Let me explain you the scenario.  I need to generate a multi-page survey
> > form on a single page.  Why I need to use single page because there is no
> > specific page size.  Survey creator specified that I want to expand the
> > survey on say 5 pages.
> >
> > Now what is happending right now is that when the survey page is called,
> > it
> > first fetches data from the database on what questions need to be
> > displayed
> > on the first page and what possible answer choices for each page (i.e.
> > textbox for text type questions, checkboxes for multiple choice questions
> > etc.) and generates the form for the first page.  This whole process goes
> > on
> > Page_Load event and it works fine.  Now there's a button on the page which
> > we
> > call Next button.  On the click of Next button, old form is saved and the
> > form for page 2 is generated and so on.  When the button is clicked,
> > Page_Load event is fired before Button Click event.  Page_Load event
> > explicitly fires button click event before generating the page 2 form and
> > sets a flag variable so that the Click event will not fire again.  When
> > the
> > Click event is fired by Page_Load event, we cannot get the controls even
> > the
> > controls collection has 0 controls in it so it gives Object reference not
> > set
> > to an instance of an object exception.
> >
> > What I need to do is when the click event is fired from Page_Load event, I
> > want to get the values of the previous dynamic controls and save them in
> > database before generating the next page.
> >
> > Thanks a lot.
> >
> > "Robert Bernhardt" wrote:
> >
> >> usamaalam schrieb:
> >> > It doesn't work, basically whether I use rptQuestionsHTML.ID or
> >> > rptQuestionsHTML.UniqueId, the control Id generated is present on the
> >> > page(I
> >> > can see the control by viewing the page source) but it doesn't get the
> >> > control programmatically.  The reason I think is on the click of the
> >> > button,
> >> > form posts back and the controls that were generated programmatically
> >> > are now
> >> > gone because on every post back, we have a set of different controls on
> >> > the
> >> > page.
> >> hi,
> >>
> >> you must also append the controls on postback and than you can iterate
> >> the repeater items to get all included controls.
> >>
> >> rb
> >>
>
>
>