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Showing content from https://github.com/yiisoft/yii2/issues/17673 below:

Javascript registered in renderDynamic doesn't appear anywhere when PageCache is used · Issue #17673 · yiisoft/yii2 · GitHub

JS or CSS registered with registerJS, registerJSFile etc will not work in renderDynamic. This problem causes, that it is not possible to use any widgets in renderDynamic on a cached page which has JavaScript or CSS assets. This issue is basically #16051 re-opened with simple step-step reproducing.

1. Create a YII2 system with the Basic Template and go there:

composer create-project --prefer-dist yiisoft/yii2-app-basic basic
cd basic

1. Add the following line as line 2 in views/site/index.php:

$this->renderDynamic('$this->registerJs("alert(\'JS started\')");');

1. Start the simple WEB server

php yii serve --port=8888

1. Go in browser to http://localhost:8888 Te alert box will appear, and you can find the following lines also in the page source:

<script src="<script>jQuery(function ($) {
alert('JS started')
});</script>

1. Now add PageCache to the Index action. Add the following code in the function behaviors in controllers/SiteController.php:

'indexCache' => [ 
    'class' => 'yii\filters\PageCache',
    'only' => ['index'],
    'duration' => 86400,    // 1 day
    'enabled' => true,
],

1. Check again the Home page. The JS code and the alert IS NOT INCLUDED anymore.

The registered JavaScript should appear in the HTML page.

All Javascript registered in renderDynamic is missing.

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