c# - textbox ontextchanged event is firing in update panel but throws error on client side -

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i have 2 div on page. when first time page load shows first div has 2 radio button. if select second button postback , hides first div , shows second div. has textbox , dropdown inside update panel. insert text textbox , hit tab fire ontextchanged event. adding option inside dropdown. throws error on client side.

error : "microsoft jscript runtime error:  sys.webforms.pagerequestmanagerparsererrorexception: message received server not parsed."

not sure here.

here aspx page.

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org   /tr/xhtml1/dtd/xhtml1-transitional.dtd">   <html xmlns="http://www.w3.org/1999/xhtml">  <head runat="server">     <title></title>  </head>   <body>     <form id="form1" runat="server">     <div id="divpanel1" runat="server">     <asp:label id="label1" runat="server" text="label : "></asp:label>     <asp:radiobutton id="radiobutton1" groupname="lbl" text="me first" runat="server"/>     <asp:radiobutton id="radiobutton2" groupname="lbl" text="me second"         runat="server" autopostback="true" oncheckedchanged="radiobutton2_checkedchanged" />         </div>     <div id="divpanel" runat="server">         <asp:scriptmanager id="scriptmanager1" runat="server">         </asp:scriptmanager>         <asp:updatepanel id="updatepanel1" runat="server">         <contenttemplate>         <asp:textbox id="textbox1" runat="server" autopostback="true" ontextchanged="textbox1_textchanged"></asp:textbox>         <asp:dropdownlist id="dropdownlist1" runat="server">             <asp:listitem selected="true" value="0">select</asp:listitem>         </asp:dropdownlist>         </contenttemplate>         </asp:updatepanel>      </div>     </form>    </body>    </html>

here code behind.

public partial class _default : system.web.ui.page {    protected void page_load(object sender, eventargs e)    {        this.divpanel.visible = false;    }    protected void textbox1_textchanged(object sender, eventargs e)    {        this.dropdownlist1.items.add(this.textbox1.text.tostring());    }    protected void radiobutton2_checkedchanged(object sender, eventargs e)    {            this.divpanel.visible = true;            this.divpanel1.visible = false;    }  }

thank time.

the error u need put in update panel <div /> , <asp:textbox /> <asp:dropdownlist>, becouse when control textbox execute event ontextchanged not able update controls , doesn't work.

the new code aspx below :

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org   /tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="head1" runat="server">     <title></title> </head> <body>     <form id="form1" runat="server">      <div id="divpanel1" runat="server">         <asp:label id="label1" runat="server" text="label : "></asp:label>         <asp:radiobutton id="radiobutton1" groupname="lbl" text="me first" runat="server" />         <asp:radiobutton id="radiobutton2" groupname="lbl" text="me second" runat="server"             autopostback="true" oncheckedchanged="radiobutton2_checkedchanged" />     </div>     <asp:scriptmanager id="scriptmanager1" runat="server">     </asp:scriptmanager>     <asp:updatepanel id="updatepanel1" runat="server">         <contenttemplate>             <div id="divpanel" runat="server">                 <asp:textbox id="textbox1" runat="server" autopostback="true" ontextchanged="textbox1_textchanged"></asp:textbox>                 <asp:dropdownlist id="dropdownlist1" runat="server">                     <asp:listitem selected="true" value="0">select</asp:listitem>                 </asp:dropdownlist>             </div>         </contenttemplate>     </asp:updatepanel>     </form> </body> </html>

the new codebehind below:

protected void page_load(object sender, eventargs e) {     if (!ispostback)     {         this.divpanel.visible = false;      }  } protected void textbox1_textchanged(object sender, eventargs e) {     this.dropdownlist1.items.add(this.textbox1.text.tostring());     dropdownlist1.databind(); } protected void radiobutton2_checkedchanged(object sender, eventargs e) {     this.divpanel.visible = true;     this.divpanel1.visible = false;  }

i hope help.

cheers.


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