Edit / delete & add content from within a view

Thanks a lot , works very nice

Hey, many thanks, the solution you posted works for me too, and it does what i expected for Drupal 7 too. I had a similar scenario.
So thanks again.
Alberto

I have added the code below to my VIEW in the header using Global:PHP. I also have 'Display even if view has no result' checked, because if I don't the link does not show up. So with the current setup it works and the button shows up. HOWEVER, I am also using Node Limit so that each user can only create a Member Portfolio once. So on the View if the user clicks the 'Add new page' button and they haven't created a page yet then it takes them to the correct page so they can. The problem I am having is if the user has created a Member Portfolio page already and clicks the button it gives them an error: "You are not authorized to access this page."

So the question is how can I modify this output where it does not show up if they have already created a Member Portfolio? I rather them not see the button than get an error.

  global $user;
  if (user_access('create member_portfolio content', $user)) {
    $output = l(t('Add new page'), 'node/add/member-portfolio');
    print $output;
  }

Is doing a PHP code snippet still the best way to put an Add/New/Create button in a view header in Drupal 8?

In any case, here are three separate ways of putting an add/new/create button at the top of a view in Drupal 8:

=-=-=-=
[1] Install the PHP filter module. Then follow SweeneyTodd's instructions above but use the following PHP code snippet instead of his. This example is for creating a new node of type "page". You can replace the word "page" with the backend name of your entity type if you want to want to use this for another entity type.

  if( \Drupal::currentUser()->hasPermission('create page content') ) {
    print '<a href="/node/add/page">Add new page</a>';
  }

[2] Install the PHP filter module. Then follow SweeneyTodd's instructions above but use the following PHP code snippet instead of his and then fix this PHP so it will work. (It looks right to me but I couldn't get it to work.) This example is for creating a new node of type "page". You can replace the word "page" with the backend name of your entity type if you want to want to use this for another entity type.

  use Drupal\Core\Url;
  use Drupal\Core\Link;
  if( \Drupal::currentUser()->hasPermission('create page content') ) {
    $addnodeurl = Url::fromRoute( 'node.add', ['node_type' => 'page'] );
    $addnodelink = Link::fromTextAndUrl( (string)t('Add new page'), $addnodeurl );
    $addnodelink = $output->toRenderable();
    $addnodelink['#attributes'] = array('class' => array('button', 'button-action', 'button--primary', 'button--small'));
    print render( $addnodeurl );
  }

[3] Use the view plugin I have created. See View area Button

=-=-=-=

If the new node should be the child of another entity and that entity is being displayed on the page, then you should be able to use the Prepopulate module to relate the new child node to its parent node.

(It's kind of surprising that such basic functionality as a button to create a new node would require any of this.)

@gdesmarais - "The string views:calendar:default:footer:views:area:content for textgroup views is not allowed for translation because of its text format."

also only admin can see this code. when user with right permissions see a view there is no link.