In Drupal 8 a filter is nothing but a form, it can be displayed above results provided by controller in following way.
Drupal Problems and Solutions
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You can redirect the user to any page after form submission in the following way.
//Don't forget to include this in beginning. This will only work in submitForm function. use Drupal\Core\Url; //Constructing a URL.Will redirect to example-page with query paramter q = 5. $response = Url::fromUserInput('/example-page?q=5'); $form_state->setRedirectUrl($response);
Blocks are the most important site building elements of Drupal 8. Many times there is a requirement of form in a block. It can be placed in following way.
Drupal 8 provides configuration manager module which helps in managing configuration across the various environment of the same website, the configuration can be fetched and altered in a custom module in following way.
For best performance, various elements such as GZIP compression, expiry headers, module deflate, correct redirection etc have to be kept in mind in case of Drupal 8. Following .htaccess files provides the ideal configuration.
# Apache/PHP/Drupal settings:
In Drupal 8 POST request can be sent using Guzzle http library in the following way.
//Creating a httpClient Object. $client = \Drupal::httpClient(); //Some Data $json_data = ['a'=>5,'b'=>6,'c'=>7]; //Sending POST Request with $json_data to example.com $request = $client->post('http://example.com', [ 'json' => [ $json_data, ] ]); //Getting Response after JSON Decode. $response = json_decode($request->getBody());
In Drupal 8 get request can be sent using Guzzle HTTP Library in following way.
$client = \Drupal::httpClient(); //Sending parameters q and key in GET request. $request = $client->get('http://api.example.com/resource/1?q=5&key=42b7b2n4wdfd'); $response = $request->getBody(); //You would like JSON decode the response.
In custom module, Node can be loaded in the following way :
use \Drupal\node\Entity\Node; //Don't forget to add a use statement in beginning of file. $node = \Drupal\node\Entity\Node::load($nid); //$nid is Node ID.