Drupal 8.x

This is a new install. when clicking on "EXTEND" and then "+Install New Module", this error message is displayed:

Your server does not support installing modules and themes from this interface. Instead, install modules and themes by uploading them directly to the server, as documented in Extending Drupal 8.

Hello, in Drupal 7 we can use hook_page_alter to change the array of the page, delete some options, add another options, etc...

I'm looking to be able to make the same like this https://github.com/oskarcalvo/acb/blob/7.x-1.x/abr.module#L140-L166 in D8.

Thanks.

Oskar

Hi everyone, 

I want to add a menu where I find:

1/ List of accessible Files

2/ When trying to download a file, another form appears to the user asking him:

- to connect 

-To register if he is not registred on the website

How can I proceceed???

In the standart version of the project, when trying to download a file, an error appears "

Hi

I have developed a web form (Using webform module version 8.x-5.0-beta23, Drupal 8) within my site. There is the requirement that if a user links to the webform from a specific place, certain parts of the webform have some preset options.

E.g. The webform in its most base form has a url of

http://abc.localhost/form/enquire

Theme: Bartik.
I want to css style a views gallery.
.views-gallery class I put in views.css:
/core/themes/bartik/css/components/views.css
.views-gallery {
background: red;
}
But that does not matter.
In which .css file should the class be written to be readable by views?
What am I doing wrong. Anyone who can help?
/ willy

////////////////

I think I've solved the problem.
Caches must be cleaned before css changes are affected.
Is it possible to prevent the page caches (when I edit the page)?

When we deselect the checkbox of "Open in new window" from linkit popup window (linkit module), The target="_blank"

is not removed from the source code of CKeditor. 

<p><a href="#" target="_blank">Test</a></p>