jquery - Use Javascript in Rails -

i started learn javascript , want use in rails. javascript code simple, experiment:

var pagealert = function(){             alert("this working");} $('#refresh-button').on('click',pagealert); 

i must put code in "application.js" file , inside function

 $(document).ready(function(){...}); 

otherwise, won't work. example, if put in "custom.js" or in "application.js" outside document.ready function, not working. assume don't have put inside document.ready function. know concept of asset pipeline, , in "application.js", have default

 //= require_tree . 

this should easy, can't figure out. suggestion or tutorial on this? thanks.

you can put code function declarations , basic javascript outside $(document).ready(function(){...}); block. try example write alert("hello world").

however $(document).ready(function(){...}); first triggered when dom loaded, ie. when browser have downloaded html , ready render page. if call javascript functions manipulate dom $('#refresh-button') outside of ready block, code runned before dom ready, , not work because, in example, there no element id refresh-button yet.

hope answers question, otherwise feel free ask more information.