javascript - Add a public function to a jquery plugin, to be called from another script -

i'm using adobe accessible mega menu plugin , looking extend this, (basically add function can called script).

i've looked extending jquery plugins, javascript closures , various other threads on subject and can see how works

i can see bunch of public attributes , methods (ln 695 on) attempting call these merely returns jquery object?

equally adding function , attempting call doesn't seem work?

i've added function called testfunction fires alert , should (i think) called :

$("nav:first").accessiblemegamenu("testfunction"); 

but no luck far..

does know how can add function above script, can called script?

https://codepen.io/anon/pen/vjzkqe

edit: solved - functions need accessed through prototype obj in :

nav.accessiblemegamenu.accessiblemegamenu.prototype.customfunction(param); 

i have implemented approach on project using extend function jquery , prototype extend infinitescroll plugin can take approach , implement plugin hope useful

$.extend($.infinitescroll.prototype, {     fucntion1: function() {       //function implementation         },     fucntion2: function() {        //function implementaion     }     }); 

take question best way extend jquery plugin