Netbeans 7 auto-completion for JavaScript

I am开发者_如何学JAVA Working on NetBeans 7.0. JavaScript auto completion is working on some cases but not on all. I think very simple cases are working Let say i have a global object/var

var str = "abcdef";

str. // auto completion popup window triggered for this.

function f(){ 

  str. // no auto completion popup window triggered for this.

}

i don't know how complete is the support for auto completion for JS in NetBeans, but this is kind of annoying. Anybody else facing similar issue?