# Drag & drop support

**URL:** <https://pdfjs.community/t/drag-drop-support/751>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [May 5, 2021, 11:30pm UTC](https://pdfjs.community/t/drag-drop-support/751 "2021-05-05T23:30:43Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [May 5, 2021, 11:30pm UTC](https://pdfjs.community/t/drag-drop-support/751/2 "2021-05-05T23:30:46Z")

</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:
- [Add annotation events](https://pdfjs.express/documentation/annotation/annotation-events)
- [Support forms with PDF.js Express](https://pdfjs.express/documentation/forms/overview)
- [Customize annotation tools - Event when tool creates an annotation](https://pdfjs.express/documentation/annotation/customizing-tools#event-when-tool-creates-an-annotation)

APIs:
- [CoreControls.AnnotationManager - getAnnotationsByMouseEvent(event)](https://pdfjs.express/api/CoreControls.AnnotationManager.html#getAnnotationsByMouseEvent__anchor)
- [Annotations.Forms.EmbeddedJS - update(callback)](https://pdfjs.express/api/Annotations.Forms.EmbeddedJS.html#update__anchor)
- [CoreControls.BlackBoxAnnotationManager - preloadAnnotations(An)](https://pdfjs.express/api/CoreControls.BlackBoxAnnotationManager.html#preloadAnnotations__anchor)

Forums:
- [(SOS) Unable to trigger annotationsLoaded event explicitly](https://pdfjs.community/t/sos-unable-to-trigger-annotationsloaded-event-explicitly/473/3)
- [Cannot lock pdf](https://pdfjs.community/t/cannot-lock-pdf/740/1)
- [Flipped annotations aren’t triggering annotationChanged (modify) event, also NOT getting saved/export](https://pdfjs.community/t/flipped-annotations-arent-triggering-annotationchanged-modify-event-also-not-getting-saved-export/591/1)

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_[View the full topic](https://pdfjs.community/t/drag-drop-support/751)._