ASP.NET-未定义__doPostBack来自DataList ItemCommand事件的错误

Question

I am using a DataList for custom paging implementation and the button click is working locally but after deploying it in my godaddy server the button click showing a __doPostBack is not defined error

The DataList code is in the Usercontrol

           <asp:DataList CellPadding="1"                        RepeatDirection="Horizontal" runat="server" ID="dlPager"                       onitemcommand="dlPager_ItemCommand">
             <ItemTemplate>
                   <asp:LinkButton Enabled='<%#Eval("Enabled") %>' 
                       runat="server" ID="lnkPageNo" 
                       Text='<%#Eval("Text") %>' 
                       CommandArgument='<%#Eval("Value") %>' 
                       CommandName="PageNo" 
                       BorderStyle="Solid" 
                       BorderWidth="2px" 
                       Font-Bold="True" 
                       Font-Size="Medium" 
                       ForeColor="White" 
                       BackColor="#0066FF" 
                       BorderColor="#66FF33"   
                       Height="20px" 
                       CausesValidation="False">
                   </asp:LinkButton>
            </ItemTemplate></asp:DataList>

And the View Source of the page shows,

  <table id="ctl00_cphBody_ctl00_dlPager" cellspacing="0" cellpadding="1" CausesValidation="False" border="0" style="border-collapse:collapse;">
<tr>
    <td>
                   <input type="button" name="ctl00$cphBody$ctl00$dlPager$ctl00$lnkPageNo" value="1" id="ctl00_cphBody_ctl00_dlPager_ctl00_lnkPageNo" disabled="disabled" style="color:White;background-color:#0066FF;border-color:#66FF33;border-width:2px;border-style:Solid;font-size:Medium;font-weight:bold;height:20px;" />
            </td><td>
                   <input type="button" name="ctl00$cphBody$ctl00$dlPager$ctl01$lnkPageNo" value="2" onclick="javascript:__doPostBack(&#39;ctl00$cphBody$ctl00$dlPager$ctl01$lnkPageNo&#39;,&#39;&#39;)" id="ctl00_cphBody_ctl00_dlPager_ctl01_lnkPageNo" style="color:White;background-color:#0066FF;border-color:#66FF33;border-width:2px;border-style:Solid;font-size:Medium;font-weight:bold;height:20px;" />
            </td><td>
                   <input type="button" name="ctl00$cphBody$ctl00$dlPager$ctl02$lnkPageNo" value="3" onclick="javascript:__doPostBack(&#39;ctl00$cphBody$ctl00$dlPager$ctl02$lnkPageNo&#39;,&#39;&#39;)" id="ctl00_cphBody_ctl00_dlPager_ctl02_lnkPageNo" style="color:White;background-color:#0066FF;border-color:#66FF33;border-width:2px;border-style:Solid;font-size:Medium;font-weight:bold;height:20px;" />
            </td>
</tr>

User control code behind

protected void dlPager_ItemCommand(object source, DataListCommandEventArgs e)
{
    if (e.CommandName == "PageNo")
    {
        GetData(Convert.ToInt32(e.CommandArgument));
    }
}

And the page load is

    if (!Page.IsPostBack)
    {         
        GetData(1);  
    }

I tried the solution mentioned in other similar threads but none worked.

I can see the doPostback scipt is already present in the viewsource of the page. I am using VS 2010

Answer 1

You need to add Page.ClientScript.GetPostBackEventReference(this, string.Empty); to the link button's OnClick event. So you have to do it in dlPager_ItemDataBound , where you can find the LinkButton from e.Item.FindControl . Your code might look like this:

protected void dlPager_ItemDataBound(object sender, DataListItemEventArgs e)
{
    var lb = e.Item.FindControl("lnkPageNo") as LinkButton;
    if (lb != null)
    {
        lb.Attributes["onclick"] = Page.ClientScript.GetPostBackEventReference(this, string.Empty);
    }
}