In Drupal 7, if I wanted to get to get the node id of the currently displayed node (e.g. node/145) I could get it with the arg() function. In this case, arg(1) would return 145.
How can I achieve the same in Drupal 8?
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The parameter will have been upcasted from nid to full node object by the time you get access to it, so:
$node = \Drupal::routeMatch()->getParameter('node');
if ($node instanceof \Drupal\node\NodeInterface) {
// You can get nid and anything else you need from the node object.
$nid = $node->id();
}
See the change record for more information.
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4I just want to add you have to careful with this - I just got stung where \Drupal::routeMatch()->getParameter('node'); will return an array of 1 item (the node id) on node revision delete pages, so if you calling a method on what you assume to be an object you will get a fatal error like "Fatal error: Call to a member function getType() on string". – Jeff Burnz Aug 10 '16 at 1:13
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Pretty much yes @Frank. It’s a bit different of course, but if you’re dropped in a context that doesn’t know what entity page (if any) it’s on, this is the recommended way to find out – Clive♦ May 2 '18 at 18:03
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1@AshwinP The parameter is whatever you write inside
{}in your route. For taxonomy terms the route paramater is calledtaxonomy_term, route definition/taxonomy/term/{taxonomy_term}. Here you can get it like this,\Drupal::routeMatch()->getParameter('taxonomy_term'). – Jdrupal Aug 22 at 8:40
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It is correct to use \Drupal::routeMatch()->getParameter('node'). If you just need the node ID, you can use \Drupal::routeMatch()->getRawParameter('node').
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if you are using or creating custom block then you have to follow this code to get current url node id.
// add libraries
use Drupal\Core\Cache\Cache;
// code to get nid
$node = \Drupal::routeMatch()->getParameter('node');
$node->id() // get current node id (current url node id)
// for cache
public function getCacheTags() {
//With this when your node change your block will rebuild
if ($node = \Drupal::routeMatch()->getParameter('node')) {
//if there is node add its cachetag
return Cache::mergeTags(parent::getCacheTags(), array('node:' . $node->id()));
} else {
//Return default tags instead.
return parent::getCacheTags();
}
}
public function getCacheContexts() {
//if you depends on \Drupal::routeMatch()
//you must set context of this block with 'route' context tag.
//Every new route this block will rebuild
return Cache::mergeContexts(parent::getCacheContexts(), array('route'));
}
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This post doesn't make sense. There is no way for anybody to know where this code goes. – Lester Peabody Nov 14 '17 at 17:58
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Note on the node preview page, the following doesn't work:
$node = \Drupal::routeMatch()->getParameter('node');
$nid = $node->id();
For the node preview page, you have to load the node this way:
$node = \Drupal::routeMatch()->getParameter('node_preview');
$nid = $node->id();
