Unable to utilize Bootstrap inside the Shadow DOM of Custom Elements

I am currently in the process of developing a web component using plain JavaScript and implementing Bootstrap 5 for styling purposes. While the Bootstrap styling is functioning correctly, I am encountering issues with the event listeners for the Bootstrap dropdown.

To address this, I have enclosed the Bootstrap JavaScript content within a script tag and placed it inside the shadow root.

Being relatively new to web components and shadow root usage, I am uncertain if incorporating Bootstrap within the shadow root is the most appropriate approach.

Any advice or guidance on this matter would be greatly appreciated!

Below is the provided code snippet for your review.

web-component.js

 // code snippet

sample.html

 // code snippet

Upon observing the output, the button displays with the appropriate Bootstrap style, however, it remains unresponsive when clicked.

javascriptcssweb-componentcustom-elementbootstrap-5

Answer №1

In short, what you are attempting to do is not feasible.

The Bootstrap framework is unable to react to events occurring within the Shadow DOM. While there are some solutions available, they are fragmented.

If you need to share CSS styles among various instances of the same component with Shadow DOM, you may want to explore using Constructible Stylesheets.

To utilize Bootstrap's JavaScript capabilities, you will need to depend on Light DOM as recommended in this response. However, this approach may not work when your component is nested within another web component with its own Shadow DOM layers. It becomes difficult to ensure that your light DOM remains unscoped from other components' Shadow DOM.

Alternatively, you could consider constructing your component without resorting to using Shadow DOM.

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