# Can not find any event triggered while toggling side panels

**URL:** <https://pdfjs.community/t/can-not-find-any-event-triggered-while-toggling-side-panels/794>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [May 28, 2021, 6:29am UTC](https://pdfjs.community/t/can-not-find-any-event-triggered-while-toggling-side-panels/794 "2021-05-28T06:29:25Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [May 28, 2021, 6:29am UTC](https://pdfjs.community/t/can-not-find-any-event-triggered-while-toggling-side-panels/794/2 "2021-05-28T06:29:30Z")

</div>

**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Hiding annotations in WebViewer notes panel](https://pdfjs.express/documentation/ui-customization/ui-customization-notes-panel)
- [Rich text - Relevant APIs and events - disableElements](https://pdfjs.express/documentation/annotation/rich-text#disableelements)
- [PDF.js Express Documentation - Annotation](https://pdfjs.express/documentation#annotation)

APIs:
- [WebViewerInstance - dangerouslySetNoteTransformFunction(noteTransformFunction)](https://pdfjs.express/api/WebViewerInstance.html#dangerouslySetNoteTransformFunction__anchor)
- [CoreControls.BlackBoxAnnotationManager - preloadAnnotations(An)](https://pdfjs.express/api/CoreControls.BlackBoxAnnotationManager.html#preloadAnnotations__anchor)
- [CoreControls.DocumentViewer - searchInProgress](https://pdfjs.express/api/CoreControls.DocumentViewer.html#event:searchInProgress__anchor)

Forums:
- [Get previous annotation from annotationChanged event](https://pdfjs.community/t/get-previous-annotation-from-annotationchanged-event/700/1)
- [Unable to show highlight texts in the list](https://pdfjs.community/t/unable-to-show-highlight-texts-in-the-list/506/1)
- [How can I specify name for the pdf file that will be downloaded](https://pdfjs.community/t/how-can-i-specify-name-for-the-pdf-file-that-will-be-downloaded/681/1)

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