__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

Another addition to this vintage thread....

I had these symptoms while developing a site using JQuery Mobile, and it turned out that it was caused by the link I followed to the affected page not having the rel="external" attribute set on it.

This meant that JQuery loaded the contents of the new page via AJAX, and 'injected' them into the current page, rather than reloading the whole thing, and hence the required postback javascript wasn't present until a full page refresh.

Answer 2

I had this problem and sometimes its just stupidity. I wrote it as __doPostback with a lowercase'b', where it should have been __doPostBack with an uppercase 'B'.