to locate "enable event handler" checkbox and "event handler output" area go to AccessibleEvents viewer and then switch to WatchedEvents tab. it'd be nice if you selected some event in the list, focused "event handler output" and started typing then that checkbox is checked automatically.

Comment on attachment 595933 [details] [diff] [review] patch If you clear the contents of the handler, would you want to automatically disable it? >- var updateCheckbox = !updateData || aRowIdx == this.selection.currentIndex; This breaks clicking on the checkboxes for other rows. >+ oninput="viewer.onWatchViewEditorChanged();"/> Is it likely that the event could fire as the user was typing, and therefore incorrect code could be executed?

Comment on attachment 596077 [details] [diff] [review] patch2 I like this approach :-) >+ this.mHandlerEditor.addEventListener("blur", this, false); Probably better to use "change" rather than "blur". r=me with that fixed. >- var idx = this.selection.currentIndex; You end up using this.selection.currentIndex in both event types anyway... >+ if (aEvent.type == "input") { >+ var isEnabled = this.mHandlerEditor.value != ""; >+ this.updateHandlerState(isEnabled, this.selection.currentIndex); [I was considering updating the handler state on the change event too, but I can't convince myself that it wouldn't be too confusing.] >+ return; Don't need this, type can't be both input and something else. (Or use switch.)

addressed Neil's comments

landed http://hg.mozilla.org/dom-inspector/rev/9856b89c71a8