__doPostBack is not defined

Question

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 gett

Answer 1

__doPostBack Works guys

Write this code in Page Load

ClientScript.GetPostBackEventReference(this, "");

Answer 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.

Answer 3

I was getting this because my script was inside an Iframe that was being "disposed" (it was a Telerik "window" that was closed). The code defining _dopostback() inside my iframe was gone, but the code calling _dopostback() inside my iframe was still hanging around. Love that JavaScript!

Answer 4

i had this error and i solved it by inserting :

<form runat="server" style="display: none"></form>

Answer 5

It is __doPostBack function not found error. Put one button in page and set its usersubmitbehavior=false, then run and see viewsource, you will have __doPostBack function automatically be added in your page.

Now put your own html button which you want to make postback from and call __doPostBack function by setting its onclick="__doPostBack('mybut','save')".

Now the __doPostBack function required for your html button is given by the above button.

Answer 6

For me it was the following was missing from the page:

<form runat="server">
</form>