__dopostback Is Not Defined

Im getting that error when try to call a __doPostBack on one of my pages, every page that i have in the project use __doPostBack function but in this particular page im getting tha

Solution 1:

The run time/client side error __doPostBack is undefined hassled me for a few hours. There was lots of misleading/incorrect help on the net. I inserted the following line of code in the Page_Load event of the default.aspx.cs file and everything worked fine, on my system and in production with GoDaddy.

ClientScript.GetPostBackEventReference(this, string.Empty);

Solution 2:

If the page doesn't have a control that causes a postback, __doPostBack() won't be output as a function definition. One way to override this is to include this line in your Page_PreRender():

this.Page.ClientScript.GetPostBackEventReference(<a control>, string.Empty);

This function returns a string calling __doPostBack(); but also forces the page to output the __doPostBack() function definition.

Solution 3:

Here's why this was happening to me: I accidentally forgot that script tags must always have closing tags:

<scriptsrc="/Scripts/appLogic/Regions.js" />

I corrected the script tag:

<scriptsrc="/Scripts/appLogic/Regions.js"type="text/javascript" ></script>

and sanity returned.

Solution 4:

Just add this code to your .aspx

<asp:ScriptManagerID="ScriptManager1"runat="server"></asp:ScriptManager>

Solution 5:

__doPostBack() should be automatically included by any ASP.NET WebControl that could cause a post back. You sound like you are calling it manually in some Javascript you wrote. If so, you will need to include a WebControl, to make sure that function in inserted onto the page.