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Encountering Error when doing post-back using __doPostBack()

Answer 1

A:

_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:DropDownList ID="list" runat="server" AutoPostBack="true">
        <asp:ListItem Text="first"></asp:ListItem>
        <asp:ListItem Text="second"></asp:ListItem>
    </asp:DropDownList>

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

Danil 2010-10-29 07:15:43

Answer 2

A:

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 :)

mahmoud 2010-10-29 07:23:35

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Encountering Error when doing post-back using __doPostBack()

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