[question] How to convert a website that requires javascript to continue rendering?

[StringKe]

How to convert a website that requires javascript to continue rendering?

For example, a website written in Vue, some websites need to wait for the page to render specific content due to the use of the framework, otherwise thedom structure is empty

[StringKe]

Wait time is not an optimal choice, can you listen to the javascript method such as console.log to output specific content while generating PDF

[peterzhang41]

hi @gulien,

wkhtmltopdf, another famous PDFconversion tool, solved this by providing an optional parameter called
--window-status, which will wait until window.status is equal to a string before rendering a page.
https://wkhtmltopdf.org/usage/wkhtmltopdf.txt

Maybe we can have something similar to this, like --form waitJsRenderStatus='DONE' ?

There is a discussion in CDP that creates an eval injection to detect the js render status, which I believe it still requires to add a 17ms delay (60 frames fresh rate) behind the wait function for the web engine actually paint the changes.
mafredri/cdp#116

Have you been already working on this?
if not, I am keen to provide PR for this if you like the idea

[gulien]

Hey @peterzhang41!

wkhtmltopdf, another famous PDFconversion tool, solved this by providing an optional parameter called
--window-status, which will wait until window.status is equal to a string before rendering a page.
https://wkhtmltopdf.org/usage/wkhtmltopdf.txt

I was not aware of the --window-status option in wkhtmltopdf, good catch! It would make a lot of sense for Gotenberg to have a similar option 👍

Have you been already working on this?
if not, I am keen to provide PR for this if you like the idea

Yes please! 😄Feel free to provide a PR, I'll gladly review it.

[peterzhang41]

Hi gulien,

https://github.com/peterzhang41/gotenberg

Sorry for the delay. The PR is almost there. Unfortunately, I don't have time to finish the doc and unit-tests. Could you pick it up and finished it? My company are all-in-aws at this moment. I have to work on a lambda puppeteer solution for my project.

Cheers

[gulien]

@peterzhang41 thanks for your work.

I plan to rewrite most of the code for the version 7.0.0 of Gotenberg, I'll take a look at what you did on your fork 👍
Maybe I'll ask you to do a quick PR so that you'll be considered as a contributor 😄

[StringKe]

@gulien 7.0 When will it be released?

[gulien]

Early fall, but it could be sooner.