WWW::Mechanize::Chrome ->click giving warning

lpowers has asked for the wisdom of the Perl Monks concerning the following question:

Hello,

While using the $mech->click function in WWW::Mechanize::Chrome, I frequently see the following warning:

Use of uninitialized value in string eq at /usr/local/share/perl5/WWW/
+Mechanize/Chrome.pm line 1279.
[download]

This error is generated from $mech->click lines like this:

$mech->click( { selector => '#dcrd-31 > div > div > div:nth-child(1)',
+ single => 1 } );
[download]

or this:

$mech->click( { xpath => '//*[@id="dcrd-31"]/div/div/div[1]', single =
+> 1 } );
[download]

Most of the time this line works fine:

$mech->click( { selector => '#signIn', single => 1 } );
[download]

But occasionally, I get the "Use of uninitialized value..." warning from it as well (sometimes 2 successive warnings).

I'm guessing that a non-alphanumeric character in the ->click selector/xpath is throwing things off.

Do I need to escape certain characters or do I need to change the selector/xpath format or am I barking up the wrong tree?

Thanks much!

2018-09-05 Athanasius added code tags

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Re: WWW::Mechanize::Chrome ->click giving warning by Corion (Patriarch) on Aug 30, 2018 at 07:37 UTC
The error occurs in Line 1279, so most likely in the request there is no `requestId` field set. This has little to do with the code you are running and more with whether the element you click on navigates within the page or whether it triggers a network/navigation request.	[reply] [d/l]
Re^2: WWW::Mechanize::Chrome ->click giving warning by lpowers (Acolyte) on Aug 30, 2018 at 15:42 UTC
So it sounds like the cause of the warning is not something I can control and likely doesn't affect the way the program works. As always, thanks for your prompt and helpful replies. It's much appreciated!	[reply]