How to load javascript module in epub xhtml

avnermoshkovitz · 06-27-2021, 09:19 AM

I have an ebook (ebook1.epub) that loads a javascript file (script1.js) like so:

Code:

cat EPUB/xhtml/raw/ch1.xhtml
<!--?xml version='1.0' encoding='UTF-8'?-->
<!DOCTYPE html><html xml:lang="en-us" lang="en-us" xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" xmlns:xlink="http://www.w3.org/1999/xlink">
    <head>
        <script type="text/javascript" src="../../js/script1.js"></script>
...
    </head>
...
</html>

# --------------------------------------------------------------

cat EPUB/package.opf
...
<item id="js4" href="js/script1.js" media-type="text/javascript"/>

This works ok. I view the book with:

Code:

calibre ebook1.epub

script1 works as expected, (e.g. calling console.log("foo1") from within script1 responds as expected and prints to the terminal where calibre was launched).

-------

Now, I need to use Javascript module file (ES6) (script2.js)
The javascript module file is loaded like so:

Code:

cat EPUB/xhtml/raw/ch1.xhtml
<!--?xml version='1.0' encoding='UTF-8'?-->
<!DOCTYPE html><html xml:lang="en-us" lang="en-us" xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" xmlns:xlink="http://www.w3.org/1999/xlink">
    <head>
        <script type="module" src="../../js/script2.js"></script>
...
    </head>
...
</html>

# --------------------------------------------------------------

cat EPUB/package.opf
...
<item id="js4" href="js/script2.js" media-type="text/javascript"/>
```

When I ran calibre with

Code:

calibre ebook2.epub

script2 does not work.
Calling function from script2:
- does not print anything to the terminal.
- the terminal shows an error message:

Code:

ERROR: clbr://internal.sandbox/book/EPUB/js/script2.js:0: Failed to load module script: The server responded with a non-JavaScript MIME type of "". Strict MIME type checking is enforced for module scripts per HTML spec.

How can I load a javascript module file in the .epub?

Thanks,
Avner

kovidgoyal · 06-27-2021, 12:07 PM

what version of calibre, what OS? As far as I know, calibre does send mimetypes for js files. It's likely a bug in Qt WebEngine's custom URL scheme handling.

kovidgoyal · 06-27-2021, 12:13 PM

And I just tried it on the current calibre release, it works fine.

avnermoshkovitz · 06-27-2021, 04:09 PM

@kovidgoyal, thanks for replying
The Calibre version is 4.99.4. The OS is Ubuntu 20.04

Can you share a LINK TO Nn example with a call to javascript module?
Maybe I'm doing something incorrectly.

Thanks,
Avner

Code:

calibre --version
calibre (calibre 4.99.4)

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal

BetterRed · 06-27-2021, 06:13 PM

Quote:

Originally Posted by avnermoshkovitz

@kovidgoyal, thanks for replying
The Calibre version is 4.99.4. The OS is Ubuntu 20.04

Can you share a LINK TO Nn example with a call to javascript module?
Maybe I'm doing something incorrectly.

Version 4.99.4 is one of a series of Calibre 5 beta test versions from Q3 2020.

Suggest you download and install the latest version from the calibre site ==>> https://calibre-ebook.com/

BR

avnermoshkovitz · 06-27-2021, 08:12 PM

I installed the latest Calibre version (5.22.1) from here

After install, I was able to load module javascript files, and see messages from console.log() in the terminal where I launched Calibre from.

Code:

cat EPUB/xhtml/raw/ch1.xhtml
<!--?xml version='1.0' encoding='UTF-8'?-->
<!DOCTYPE html><html xml:lang="en-us" lang="en-us" xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" xmlns:xlink="http://www.w3.org/1999/xlink">
    <head>
        <script type="module" src="../../js/script2.js"></script>
...
    </head>
...
</html>

# --------------------------------------------------------------

cat EPUB/package.opf
...
        <item id="js4" href="js/script2.js" media-type="module"/>

When I ran calibre with

Code:

calibre ebook2.epub

script2 works ok.
I can see messages from Console.log() in the terminal.

kovidgoyal, thanks for your help.
Avner

06-27-2021, 04:09 PM	#4
avnermoshkovitz Member Posts: 22 Karma: 10 Join Date: Jun 2021 Device: Any ereader for Android or iOS	@kovidgoyal, thanks for replying The Calibre version is 4.99.4. The OS is Ubuntu 20.04 Can you share a LINK TO Nn example with a call to javascript module? Maybe I'm doing something incorrectly. Thanks, Avner Code: calibre --version calibre (calibre 4.99.4) lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.2 LTS Release: 20.04 Codename: focal

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06-27-2021, 12:07 PM	#2
kovidgoyal creator of calibre Posts: 45,289 Karma: 27111238 Join Date: Oct 2006 Location: Mumbai, India Device: Various	what version of calibre, what OS? As far as I know, calibre does send mimetypes for js files. It's likely a bug in Qt WebEngine's custom URL scheme handling.

06-27-2021, 12:13 PM	#3
kovidgoyal creator of calibre Posts: 45,289 Karma: 27111238 Join Date: Oct 2006 Location: Mumbai, India Device: Various	And I just tried it on the current calibre release, it works fine.

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