CODEWITHSUNDEEP
javascripthttps
IvanGL
IvanGL

Reputation: 767

Determine protocol used to load javascript

I have javascript file, located on one domain, e.g: http://mydomain.com/script.js

Some pages (from other domains) include my javascript using SCRIPT tag. They can include it via http or https

<script src="http://mydomain.com/script.js"></script>
or
<script src="https://mydomain.com/script.js"></script>

Also they can include my script using 3rdparty iframes, e.g:

<iframe src="http://3rdparty.com/frame.php">

where http://3rdparty.com/frame.php outputs

<script src="http://mydomain.com/script.js"></script>
or
<script src="https://mydomain.com/script.js"></script>

I can edit only static javascript file script.js on mydomain.com.

How I can detect what protocol used to load my javascript (https://mydomain.com/script.js or http://mydomain.com/script.js)?

Upvotes: 2

Views: 4110

Answers (3)

Schroedingers Cat
Schroedingers Cat

Reputation: 3129

I do not believe that you have any ability to identify within the code how it has been loaded. The best suggestion I can come up with is to have the http and https point to different locations ( i.e. be different sites ) and have something within the code that indicates which one is being picked up.

var protocol='http'

or

var protocol='https'

It does mean maintaining two files, and two sites though.

ETA: I thought James Wiseman had the answer, but of course that will only return the protocol of the PAGE, not the SCRIPT. If you know these are related, that would work ( often the https is loaded on https pages and vv ). But it is not definitive.

It is a good solution if you can be confident that the protocol on hte page is the same as on the script.

Upvotes: 1

yoyo-yuan
yoyo-yuan

Reputation: 71

You can use this:

document.location.protocol + "//mydomain.com/script.js"

Upvotes: 4

Pekka
Pekka

Reputation: 449415

You can use a protocol relative URL:

<script src="//mydomain.com/script.js"></script>

Upvotes: 19

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