Managing custom Bootstrap 4 styles and assets within Yii2 framework

Recently, I integrated the yii2-bootstrap4 extension into my yii2-advanced project and customized it using a Sass file named custom.css.

After adding custom.css to frontend/web/css, I made modifications to frontend/assets/AppAsset.php as shown below:

class AppAsset extends AssetBundle
{
    public $basePath = '@webroot';
    public $baseUrl = '@web';
    public $css = [
        'css/custom.css',
        'css/site.css',
    ];
    public $js = [
    ];
    public $depends = [
        'yii\web\YiiAsset',
        'yii\bootstrap4\BootstrapAsset',
    ];
}

Although I achieved the desired outcome, I observed that the <head>...</head> section of my pages now includes the following:

<link href="/yii2-advanced/frontend/web/assets/1758a11a/css/bootstrap.css" rel="stylesheet">
<link href="/yii2-advanced/frontend/web/css/custom.css" rel="stylesheet">
<link href="/yii2-advanced/frontend/web/css/site.css" rel="stylesheet"></head>

Furthermore:

  • [...]/css/bootstrap.css still contains the original Bootstrap 4 css
  • Removing the first entry from the DOM (via Devtools) does not affect the web pages.

Queries

  1. Is this the recommended method for replacing the Bootstrap 4 css file in Yii2?
  2. Is there a way to prevent the loading of [...]/css/bootstrap.css?
cssbootstrap-4yii2

Answer №1

After taking inspiration from a suggestion in another post on Stack Overflow (thanks to @Sfili_81), I was able to resolve the issue by making changes to the frontend/assets/AppAsset.php file like so:

class AppAsset extends AssetBundle
{
    public $basePath = '@webroot';
    public $baseUrl = '@web';
    public $css = [
        'css/custom.css',
        'css/site.css',
    ];
    public $js = [
    ];
    public $depends = [
        'yii\web\YiiAsset',
        'yii\bootstrap4\BootstrapAsset',
    ];

    public function init(){
        parent::init();
        // modifying BootstrapAsset to prevent loading its own css files
        \Yii::$app->assetManager->bundles['yii\\bootstrap4\\BootstrapAsset'] = [
            'css' => [],
            //'js' => []
        ];
    }
}

As a result, only the following css files are now included in the <head> section:

<link href="/yii2-advanced/frontend/web/css/custom.css" rel="stylesheet">
<link href="/yii2-advanced/frontend/web/css/site.css" rel="stylesheet">

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