Encountering Error When Doing Post-back Using __dopostback()

I am getting an error on javascript when doing post back. The code is as follows: <%@ Page Language='C#' AutoEventWireup='true' CodeFile='test.aspx.cs' Inherits='test' %> &l

Solution 1:

you can use a hidden button to do this task

Button1.Attributes.CssAttributes.Add("Display","None");

after hiding the button

you can call its click function from javascript

document.getElementById('<%=Button1.ClientID%>').click();

this will call Button1_Click on server

** remember to set UseSubmitBehaviour=false to make this work on non-IE browsers

hope that helps :)

Solution 2:

__doPostBack is not created by default. If the page does not have a control that causes a postback then ASP.NET does not create/generate this method. In your case you can force ASP.NET to generate __doPostBack by adding the following line in you Page_Load event:

ClientScript.GetPostBackEventReference(this, string.Empty);

This line will force the creation of this method.

Solution 3:

_doPostBack isn't created by default. It appears when you are adding control with autoPostBack=true or adding some grid with buttons in it. So there is no _doPostBack javascript generated in your code. If you add

<asp:DropDownListID="list"runat="server"AutoPostBack="true"><asp:ListItemText="first"></asp:ListItem><asp:ListItemText="second"></asp:ListItem></asp:DropDownList>

for instance your code will work. Don't know if it is really useful code :) however.