Add a simple search block associated with an Advanced Search View Page

src/Form/SearchForm.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace Drupal\islandora_advanced_search\Form;
+
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use \Drupal\Core\Url;
+
+class SearchForm  extends FormBase
+{
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId()
+  {
+    return 'search_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state)
+  {
+    $block = \Drupal\block\Entity\Block::load("search");
+
+    if ($block) {
+      $settings = $block->get('settings');
+      $view_machine_name = $settings['search_view_machine_name'];
+
+    }
+    $form['search-textfield'] = array(
+      '#type' => 'textfield',
+      '#title' => (!empty($settings['search_textfield_label']) ? $settings['search_textfield_label'] : ''),
+      '#attributes' => ['placeholder' => $settings['search_placeholder']]
+    );
+
+    $form['actions']['#type'] = 'actions';
+    $form['actions']['submit'] = array(
+      '#type' => 'submit',
+      '#value' => (!empty($settings['search_submit_label']) ? $settings['search_submit_label'] : 'Search'),
+      '#button_type' => 'primary',
+    );
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state)
+  {
+    $block = \Drupal\block\Entity\Block::load("search");
+    if ($block) {
+      $settings = $block->get('settings');
+      $view_machine_name = $settings['search_view_machine_name'];
+    }
+    $url = Url::fromRoute($view_machine_name, [
+      'a[0][f]' => 'all',
+      'a[0][i]' => 'IS',
+      'a[0][v]' => $form_state->getValues()['search-textfield'],
+
+    ]);
+    $form_state->setRedirectUrl($url);
+  }
+}

src/Plugin/Block/SearchBlock.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Drupal\islandora_advanced_search\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a 'SearchBlock' block.
+ *
+ * @Block(
+ *  id = "search_block",
+ *  admin_label = @Translation("Search"),
+ * )
+ */
+class SearchBlock extends BlockBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      ] + parent::defaultConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function blockForm($form, FormStateInterface $form_state) {
+    $form['search-attributes'] = [
+      '#type' => 'fieldset',
+      '#title' => $this->t('Configure Search Block'),
+    ];
+    $views = \Drupal::EntityTypeManager()->getStorage('view')->loadMultiple();
+    $options = [];
+    foreach ($views as $view_name => $view) {
+        $displays = $view->get("display");
+        foreach ($displays as $display) {
+          if ($display['display_plugin'] === "page") {
+            $options["view.$view_name". "." . $display['id']] = "view.$view_name". "." . $display['id'];
+          }
+        }
+    }
+    $form['search-attributes']['view_machine_name'] = [
+      '#type' => 'select',
+      '#title' => $this->t('Select Search Results Page\'s Machine Name:'),
+      '#default_value' => $this->configuration['search_view_machine_name'],
+      '#options' => $options
+    ];
+    $form['search-attributes']['search_textfield'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Search Keyword Textfield Label:'),
+      '#default_value' => $this->configuration['search_textfield_label'],
+      '#maxlength' => 255,
+    ];
+    $form['search-attributes']['search_placeholder_textfield'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Search Keyword Textfield Placeholder:'),
+      '#default_value' => $this->configuration['search_placeholder'],
+      '#maxlength' => 255,
+    ];
+
+    $form['search-attributes']['search_submit'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Search Button Label:'),
+      '#default_value' => $this->configuration['search_submit_label'],
+      '#maxlength' => 255,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function blockSubmit($form, FormStateInterface $form_state) {
+    $this->configuration['search_view_machine_name'] = $form_state->getValues()['search-attributes']['view_machine_name'];
+    $this->configuration['search_textfield_label'] = $form_state->getValues()['search-attributes']['search_textfield'];
+    $this->configuration['search_placeholder'] = $form_state->getValues()['search-attributes']['search_placeholder_textfield'];
+    $this->configuration['search_submit_label'] = $form_state->getValues()['search-attributes']['search_submit'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    return \Drupal::formBuilder()->getForm('Drupal\islandora_advanced_search\Form\SearchForm');
+  }
+
+}