public function views_lazy_load_plugin_display_extender::pre_execute in Views Lazy Load 7

Same name and namespace in other branches

1. 8 includes/views/views_lazy_load_plugin_display_extender.inc \views_lazy_load_plugin_display_extender::pre_execute()

Set up any variables on the view prior to execution.

Overrides views_plugin_display_extender::pre_execute

File

includes/views/views_lazy_load_plugin_display_extender.inc, line 12

A display extender plugin for lazy loading a view.

Class

views_lazy_load_plugin_display_extender

@file A display extender plugin for lazy loading a view.

Code

public function pre_execute() {
  if ($this
    ->isEnabled() && empty($this->view->live_preview)) {
    if (!$this
      ->isExcludedUserAgent()) {

      // Lazy loading requires an AJAX view.
      $this->view
        ->set_use_ajax(TRUE);

      // Marking the view as executed prevents the Search API querying.
      $this->view->executed = TRUE;

      // Add the loading text in the area plugin.
      $this
        ->addLoadingArea();

      // Add our JavaScript to the page with an array of dom_ids that can be
      // used client side to retrieve the view instance.
      $path = drupal_get_path('module', 'views_lazy_load');
      $settings[] = $this->view->dom_id;
      drupal_add_js(array(
        'views_lazy_load' => $settings,
      ), 'setting');
      drupal_add_js($path . '/js/views-lazy-load.js', array(
        'scope' => 'footer',
        'weight' => 10,
      ));
    }
    else {

      // Ensure that AJAX won't be used if a crawler is visiting the view
      $this->view
        ->set_use_ajax(FALSE);
    }
  }
}