Add notes in docs

doc22940 · Nov 6, 2019 · b167f1b · b167f1b
1 parent 6a8c696
commit b167f1b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/UI.ts b/src/UI.ts
@@ -376,7 +376,7 @@ export class UIButton extends UI {
 
 
   /**
-   * Add a new contextmenu handler. `contextmenu` is similar to right click, see the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/Element/contextmenu_event). Remember this button will also need to be tracked for events via `UI.track`.
+   * Add a new contextmenu handler. `contextmenu` is similar to right click, see the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/Element/contextmenu_event). Remember this button will also need to be tracked for events via `UI.track`. Also note that you may need to use `event.preventDefault()` in the callback function to prevent other events from triggering.
    * @param fn a [`UIHandler`](#link) callback function: `fn( target:UI, pt:Pt, type:string, evt:MouseEvent )`
    * @returns an id number that refers to this handler, for use in [`UIButton.offContextMenu`](#link) or [`UI.off`](#link).
    */