renderItem() public method
Renders a single collapsible item group
public string renderItem ( $header, $item, $index ) | ||
---|---|---|
$header | string |
A label of the item group $items |
$item | array |
A single item from $items |
$index | integer |
The item index as each item group content must have an id |
return | string |
The rendering result |
throws | yii\base\InvalidConfigException |
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