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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Drupal\visitors\Plugin\views\field; |
| 6 | |
| 7 | use Drupal\views\Attribute\ViewsField; |
| 8 | use Drupal\views\Plugin\views\field\FieldPluginBase; |
| 9 | |
| 10 | /** |
| 11 | * Field handler to display bounce rate percentage. |
| 12 | */ |
| 13 | #[ViewsField("visitors_bounce_rate")] |
| 14 | class BounceRate extends FieldPluginBase { |
| 15 | |
| 16 | /** |
| 17 | * {@inheritdoc} |
| 18 | */ |
| 19 | public function query() { |
| 20 | $this->ensureMyTable(); |
| 21 | |
| 22 | $bounce_rate_alias = $this->tableAlias . '__bounce_rate'; |
| 23 | |
| 24 | // Check if already added. |
| 25 | foreach ($this->query->fields as $field_info) { |
| 26 | if (!empty($field_info['alias']) && $field_info['alias'] === $bounce_rate_alias) { |
| 27 | $this->field_alias = $bounce_rate_alias; |
| 28 | return; |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | $expression = "CASE WHEN {$this->tableAlias}.total_events = 1 THEN 1 ELSE 0 END) / COUNT(DISTINCT {$this->tableAlias}.id"; |
| 33 | |
| 34 | // Add as a raw expression, telling Views NOT to aggregate or group it. |
| 35 | $params = [ |
| 36 | 'alias' => $bounce_rate_alias, |
| 37 | 'aggregate' => TRUE, |
| 38 | 'function' => 'sum', |
| 39 | ]; |
| 40 | |
| 41 | $this->field_alias = $this->query->addField(NULL, $expression, $bounce_rate_alias, $params); |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * {@inheritdoc} |
| 46 | */ |
| 47 | public function render($values) { |
| 48 | $value = $this->getValue($values); |
| 49 | |
| 50 | if ($value === NULL || $value === '') { |
| 51 | return ''; |
| 52 | } |
| 53 | |
| 54 | // Format as percentage with 2 decimal places. |
| 55 | return number_format((float) $value * 100, 0) . '%'; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * {@inheritdoc} |
| 60 | */ |
| 61 | public function usesGroupBy() { |
| 62 | return FALSE; |
| 63 | } |
| 64 | |
| 65 | } |