How to get the file-path of the currently executing javascript code

user_122422 0
Viewed 128877

I'm trying to do something like a C #include "filename.c", or PHP include(dirname(__FILE__)."filename.php") but in javascript. I know I can do this if I can get the URL a js file was loaded from (e.g. the URL given in the src attribute of the tag). Is there any way for the javascript to know that?

Alternatively, is there any good way to load javascript dynamically from the same domain (without knowing the domain specifically)? For example, lets say we have two identical servers (QA and production) but they clearly have different URL domains. Is there a way to do something like include("myLib.js"); where myLib.js will load from the domain of the file loading it?

Sorry if thats worded a little confusingly.

src absolute-path include javascript
12 Answers

Within the script:

var scripts = document.getElementsByTagName("script"),
    src = scripts[scripts.length-1].src;

This works because the browser loads and executes scripts in order, so while your script is executing, the document it was included in is sure to have your script element as the last one on the page. This code of course must be 'global' to the script, so save src somewhere where you can use it later. Avoid leaking global variables by wrapping it in:

(function() { ... })();
user_1108120

Refining upon the answers found here:

little trick

getCurrentScript and getCurrentScriptPath

I came up with the following:

//Thanks to https://stackoverflow.com/a/27369985/5175935
var getCurrentScript = function() {

  if (document.currentScript && (document.currentScript.src !== ''))
    return document.currentScript.src;
  var scripts = document.getElementsByTagName('script'),
    str = scripts[scripts.length - 1].src;
  if (str !== '')
    return str ;
  //Thanks to https://stackoverflow.com/a/42594856/5175935
  return new Error().stack.match(/(https?:[^:]*)/)[0];

};

//Thanks to https://stackoverflow.com/a/27369985/5175935
var getCurrentScriptPath = function() {
  var script = getCurrentScript(),
    path = script.substring(0, script.lastIndexOf('/'));
  return path;
};

console.log({path: getCurrentScriptPath()})

user_51759350

I may be misunderstanding your question but it seems you should just be able to use a relative path as long as the production and development servers use the same path structure.

<script language="javascript" src="js/myLib.js" />
user_1019140

Regardless of whether its a script, a html file (for a frame, for example), css file, image, whatever, if you dont specify a server/domain the path of the html doc will be the default, so you could do, for example,

<script type=text/javascript src='/dir/jsfile.js'></script>

or

<script type=text/javascript src='../../scripts/jsfile.js'></script>

If you don't provide the server/domain, the path will be relative to either the path of the page or script of the main document's path

user_118200

I've thrown together some spaghetti code that will get the current .js file ran (ex. if you run a script with "node ." you can use this to get the directory of the script that's running)

this gets it as "file://path/to/directoryWhere/fileExists"

var thisFilesDirectoryPath = stackinfo()[0].traceline.substring("readFile (".length, stackinfo()[0].traceline.length - ")".length-"readFile (".length);

this requires an npm package (im sure its on other platforms as well):

npm i stackinfo

import stackinfo from 'stackinfo'; or var {stackinfo} = require("stackinfo");

user_178066430 
function getCurrnetScriptName() {
    const url = new URL(document.currentScript.src);
    const {length:len, [len-1]:last} = url.pathname.split('/');
    return last.slice(0,-3);
}
user_17240190
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