Load content of a dynamic page

Html ex:
```html
<a href="#" data-dropdown="#dropdown-1" data-src="dropdown-1.php">
<div id="dropdown-1" class="dropdown-menu has-tip">
    <div class="context-loader"></div>
</div>
```

dropdown-1.php
```php
<?php
echo json_encode(array(
            array(
                'text' => 'Item 1',
                'href' => Router::url('/item1')
            ),
            array(
                'text' => 'Item 2',
                'href' => Router::url('/item2')
            ),
            array(
                'text' => 'Item 3',
                'href' => Router::url('/item3')
            )
        ));
```