Why findcontrol("x") ASP.NET method can not find a HTML control that made via javascript?

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hi all
my web page has an optional contact that user can add input text for any contact like cellphone or email,when user click create contact button, it make a input box with attributes like unique id(for example "txtrelat1") or runat="server"(in client-side but web page has an input box with id="txtrelat0" by default) and when user click submit button ,calls "register" method in server-side by onserverclick event,
main question is,when i use form1.FindControl("txtrelat0"),it's find and i can convert it to HtmlInputText but when i want form1.FindControl("txtrelat1") it's not find and return null?
thank's all

What I have tried:

HtmlInputText intex = FindControl("txtrelat0") as HtmlInputText;

Posted 26-Mar-16 0:27am

mohamadMahmodi

Updated 26-Mar-16 2:32am

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F-ES Sitecore · Accepted Answer · 2016-03-26T02:32:00

The runat tag is processed by .net when the page is generated, it has no meaning client-side and adding an element with a runat tag from javascript doesn't make that a server-side control, it simply creates an element with an attribute that is ignored.

What you have to do is ensure the input you create has a unique name (the id is irrelevant) and in your server code use Request.Form to read the value. So create boxes like

<input type="text" name="text1"/>
<input type="text" name="text2"/>

then in your server-code

C#

Request.Form["text1"];
Request.Form["text2"];