JS script not running in EPub, sample attached

Ilcaa · 02-18-2025, 11:01 AM

hello, i am trying to run a JS script that places each sentences into its own line.

This JS script works because i can successfully run it on my browser on any website, BUT i follwed the instructions for adding JS scripts to EPub via Sigil and I cant get it to work. can you take a look (file attached)

seems striaght forward...
1. add JS Script to Misc folder.
2. select the xHTML file, right click and select "link JS File"
3. Sigil adds script tags to the xHTML pointing to JS Script
4. save as EPub

i am attaching a very small sample with the script. If someone could correct it and let me know what I was missing that would be great. Thanks for the help

KevinH · 02-18-2025, 12:09 PM

Have you enabled javascript in Sigil Preferences? It is off by default for security reasons.

Are you creating an epub3? Epub2 does not support javascript.

What e-readers have you tested it with? Not all epub3 e-readers support javascript? And no epub2 only e-readers do that I know of.

Where or how is your javascript function invoked? Defining a javascript function does not invoke it.

And fwiw, scripting the nav which is meant to always be machine parseable is probably not the best idea.

Doitsu · 02-18-2025, 01:46 PM

Quote:

Originally Posted by Ilcaa

i am attaching a very small sample with the script. If someone could correct it and let me know what I was missing that would be great. Thanks for the help

You'll need to add onload to actually load the script:

Code:

<body onload="javascript:init()">

And as KevinH has already pointed out, you'll need to enable the Javascript option in Sigil.

However, using JavaScript in this way wouldn't be useful, if you actually want to permanently change text in the epub.

KevinH · 02-18-2025, 02:03 PM

Yes, without the onload to actually invoke your javascript function you would have to manually invoke it someplace just before the ending body tag:

Something like:

Code:

...
  <script type="application/javascript" src="../Misc/Script0001.js" ></script>
</head>

<body>
  <p>this is some text.  This more text.  Try another type of texting.</p>
  <p>this is some text.  This more text.  Try another type of texting.</p>
  <p>this is some text.  This more text.  Try another type of texting.</p>
  <script type="application/javascript">init()</script>
</body>
...

But using onload to invoke the function you linked in is much nicer.

Alternatively you could instead add the call to invoke init() to the end of the script itself and then link in the script not in head but instead just before the body close tag.

But in my opinion Doitsu's approach is the best/most compliant.

Ilcaa · 02-18-2025, 04:28 PM

thanks for the response...

1. i activeated the JS script function in 'Preferences' within Sigil.
2. I added the Onload event (both methods proposed above) everything seems to work as intended, and the sentences get parsed
3. i tried it on Calibre reader and it works good, i tried it on some other desktop readers, some worked out did not...

BUT right now, its what i expected. Thanks for the replies and assistance

02-18-2025, 12:09 PM	#2
KevinH Sigil Developer Posts: 8,377 Karma: 5581842 Join Date: Nov 2009 Device: many	Have you enabled javascript in Sigil Preferences? It is off by default for security reasons. Are you creating an epub3? Epub2 does not support javascript. What e-readers have you tested it with? Not all epub3 e-readers support javascript? And no epub2 only e-readers do that I know of. Where or how is your javascript function invoked? Defining a javascript function does not invoke it. And fwiw, scripting the nav which is meant to always be machine parseable is probably not the best idea. Last edited by KevinH; 02-18-2025 at 12:53 PM.

02-18-2025, 02:03 PM	#4
KevinH Sigil Developer Posts: 8,377 Karma: 5581842 Join Date: Nov 2009 Device: many	Yes, without the onload to actually invoke your javascript function you would have to manually invoke it someplace just before the ending body tag: Something like: Code: ... <script type="application/javascript" src="../Misc/Script0001.js" ></script> </head> <body> <p>this is some text. This more text. Try another type of texting.</p> <p>this is some text. This more text. Try another type of texting.</p> <p>this is some text. This more text. Try another type of texting.</p> <script type="application/javascript">init()</script> </body> ... But using onload to invoke the function you linked in is much nicer. Alternatively you could instead add the call to invoke init() to the end of the script itself and then link in the script not in head but instead just before the body close tag. But in my opinion Doitsu's approach is the best/most compliant. Last edited by KevinH; 02-18-2025 at 02:22 PM.

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02-18-2025, 04:28 PM	#5
Ilcaa Junior Member Posts: 3 Karma: 10 Join Date: Dec 2011 Device: Nook	thanks for the response... 1. i activeated the JS script function in 'Preferences' within Sigil. 2. I added the Onload event (both methods proposed above) everything seems to work as intended, and the sentences get parsed 3. i tried it on Calibre reader and it works good, i tried it on some other desktop readers, some worked out did not... BUT right now, its what i expected. Thanks for the replies and assistance

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