How to include a certain javascript file after <body> tag -

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i'm getting error typeerror: document.body null in javascript.

and solution found here. problem how can load specific javascript file(where error come from) after <body>? or add window.onload = function() file?

and especially, how tell path of javascript file app?

i know how include every file application.js, trigger before <body> load

since mention application.js assume you're using rails? in case, use javascript_include_tag include file in application.html.erb before closing </body> tag.


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