Re^6: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? (update)

I can't find any decoded_content method documented in WWW::Mechanize::PhantomJS (?)

You're right. It's a WWW::Mechanize method, so I just presumed it worked with WWW::Mechanize::PhantomJS as well. I'll give content a try. Thanks!

UPDATE: No difference. Same exact result as the decoded_content method.

Otherwise are you sure your JS-App really works inside PhantomJS? It wouldn't be the first case of browser incompatibilities.

Yeah, I don't know. That's a good point. Maybe not?

UPDATE #2: OK, so I think that's the problem. I added print $_->{message},"\n" for $mech->js_errors(); to my code, and I'm getting a mess of TypeError: undefined is not a function (evaluating ...) JavaScript errors that I don't see in any major web browser.

How very disappointing. I guess I'll have to try to get WWW::Mechanize::Firefox working...

Or maybe I can inject some polyfills? Seems others have encountered this sort of problem with PhantomJS:
https://github.com/tom-james-watson/phantomjs-polyfill
https://github.com/mathiasbynens/String.prototype.startsWith

I might try that first... I'm thinking the best way to do that is to copy ghostdriver/src/main.js and add the polyfills to that?

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Re^7: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? (update) by Corion (Patriarch) on Aug 22, 2021 at 07:19 UTC
WWW::Mechanize::Firefox also is on development hiatus until it properly moves to the Chrome Developer Tools protocol. The only module of the three currently under development is WWW::Mechanize::Chrome. This works with all Chrome versions from v62 onwards. Maybe an early version of Chrome still works on your RH 6 environment.	[reply]
Re^8: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? by LanX (Saint) on Aug 22, 2021 at 12:00 UTC
> WWW::Mechanize::Firefox also is on development hiatus No backwards compatibility to old FF V54 with MozRepl installed? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^9: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? by Corion (Patriarch) on Aug 22, 2021 at 12:19 UTC
Oh, yes - it is still compatible with Firefox up to version 54, but I can't test it anymore since I don't have a Firefox this old anymore.	[reply]
Re^7: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? (update) by Darth Ed (Beadle) on Aug 24, 2021 at 00:55 UTC
OK, so I think that's the problem. I added print $_->{message},"\n" for $mech->js_errors(); to my code, and I'm getting a mess of TypeError: undefined is not a function (evaluating ...) JavaScript errors that I don't see in any major web browser. How very disappointing. I guess I'll have to try to get WWW::Mechanize::Firefox working... Or maybe I can inject some polyfills? Seems others have encountered this sort of problem with PhantomJS: https://github.com/tom-james-watson/phantomjs-polyfill https://github.com/mathiasbynens/String.prototype.startsWith I might try that first... I'm thinking the best way to do that is to copy ghostdriver/src/main.js and add the polyfills to that? Well, no such luck with that. Adding the polyfills to the main.js didn't seem to help at all. I give up!	[reply]
Re^8: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? by LanX (Saint) on Aug 24, 2021 at 10:36 UTC
Sorry, but I find this whole shooting in the dark approach dubious. First you should make clear that this app works in a normal browser on your old system. Then try either a FF v54 (or less) or a supported Chrome. If none succeeds your out of luck, either switch your OS or try an alternative like Selenium. If you want to participate in a horse race don't start by doping a donkey, just get a horse. Anyway your JS bug doesn't sound like something which can be fixed with polyfills. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^8: How do I get WWW::Mechanize::PhantomJS to wait until the JavaScript on the web page has finished executing? (update) by bliako (Monsignor) on Aug 24, 2021 at 10:06 UTC
perhaps stupid suggestion, but shouldn't the polyfills be injected before any other JS-from-server being run (not after)? Is there a way to first inject the polyfills and then load the page, without "erasing" them? Hmmm tricky. Perhaps fetch the page, even with errors. Then insert the polyfills. Then initiate a re-run which will already have the poly-fills added. The latter perhaps with triggering an event or running a JS function. My first call would be to check if polyfills can be run OK with your current setup. Make a local html test file and load them in WWW::Mechanize::*. If test is successful then you may have a way to solve your problem. bw, bliako	[reply]


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