yii2/docs/guide/widget-bootstrap.md

Bootstrap Widgets
=================

> Note: This section is under development.

Out of the box, Yii includes support for the [Bootstrap 3](http://getbootstrap.com/) markup and components framework
(also known as "Twitter Bootstrap"). Bootstrap is an excellent, responsive framework that can greatly speed up the
client-side of your development process.

The core of Bootstrap is represented by two parts:

- CSS basics, such as a grid layout system, typography, helper classes, and responsive utilities.
- Ready to use components, such as forms, menus, pagination, modal boxes, tabs etc.

Basics
------

Yii doesn't wrap the bootstrap basics into PHP code since HTML is very simple by itself in this case. You can find details
about using the basics at [bootstrap documentation website](http://getbootstrap.com/css/). Still Yii provides a
convenient way to include bootstrap assets in your pages with a single line added to `AppAsset.php` located in your
`@app/assets` directory:

```php
public $depends = [
    'yii\web\YiiAsset',
    'yii\bootstrap\BootstrapAsset', // this line
    // 'yii\bootstrap\BootstrapThemeAsset' // uncomment to apply bootstrap 2 style to bootstrap 3
];
```

Using bootstrap through Yii asset manager allows you to minimize its resources and combine with your own resources when
needed.

Yii widgets
-----------

Most complex bootstrap components are wrapped into Yii widgets to allow more robust syntax and integrate with
framework features. All widgets belong to `\yii\bootstrap` namespace:

- [[yii\bootstrap\ActiveForm|ActiveForm]]
- [[yii\bootstrap\Alert|Alert]]
- [[yii\bootstrap\Button|Button]]
- [[yii\bootstrap\ButtonDropdown|ButtonDropdown]]
- [[yii\bootstrap\ButtonGroup|ButtonGroup]]
- [[yii\bootstrap\Carousel|Carousel]]
- [[yii\bootstrap\Collapse|Collapse]]
- [[yii\bootstrap\Dropdown|Dropdown]]
- [[yii\bootstrap\Modal|Modal]]
- [[yii\bootstrap\Nav|Nav]]
- [[yii\bootstrap\NavBar|NavBar]]
- [[yii\bootstrap\Progress|Progress]]
- [[yii\bootstrap\Tabs|Tabs]]


Using the .less files of Bootstrap directly
-------------------------------------------

If you want to include the [Bootstrap css directly in your less files](http://getbootstrap.com/getting-started/#customizing)
you may need to disable the original bootstrap css files to be loaded.
You can do this by setting the css property of the [[yii\bootstrap\BootstrapAsset|BootstrapAsset]] to be empty.
For this you need to configure the `assetManager` application component as follows:

```php
    'assetManager' => [
        'bundles' => [
            'yii\bootstrap\BootstrapAsset' => [
                'css' => [],
            ]
        ]
    ]
```