Fixes #2425: Tabs widget now selects first tab if no active tab is specified

CHANGELOG.md

@@ -11,6 +11,7 @@ Yii Framework 2 bootstrap extension Change Log
 - Enh #1562: Added `yii\bootstrap\Tabs::linkOptions` (kartik-v)
 - Enh #1601: Added support for tagName and encodeLabel parameters in ButtonDropdown (omnilight)
 - Enh #1881: Improved `yii\bootstrap\NavBar` with `containerOptions`, `innerContainerOptions` and `renderInnerContainer` (creocoder)
+- Enh #2425: Tabs widget now selects first tab if no active tab is specified (samdark)
 - Chg #1459: Update Collapse to use bootstrap 3 classes (tonydspaniard)
 - Chg #1820: Update Progress to use bootstrap 3 markup (samdark)
 

Tabs.php

@@ -124,6 +124,11 @@ class Tabs extends Widget
 	{
 		$headers = [];
 		$panes = [];
+
+		if (!$this->hasActiveTab() && !empty($this->items)) {
+			$this->items[0]['active'] = true;
+		}
+
 		foreach ($this->items as $n => $item) {
 			if (!isset($item['label'])) {
 				throw new InvalidConfigException("The 'label' option is required.");
@@ -168,6 +173,19 @@ class Tabs extends Widget
 	}
 
 	/**
+	 * @return boolean if there's active tab defined
+	 */
+	protected function hasActiveTab()
+	{
+		foreach ($this->items as $item) {
+			if (isset($item['active']) && $item['active']===true) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
 	 * Normalizes dropdown item options by removing tab specific keys `content` and `contentOptions`, and also
 	 * configure `panes` accordingly.
 	 * @param array $items the dropdown items configuration.