[javascript] determine if field has focus SOLVED

[Mathew]

Is there a way to determine which field has focus from javascript? Or if a field has focus?

I want to be able to programmatically add some text and a date to the current field, but can't figure out how to know which field is active.

[Tracker Supp-Stefan]

Hello Mathew,

Would listening for the Field/Focus event work for you?

Or do you need to check which is the active field at a time when a script is run manually and is not constantly listening for that event?

Kind regards,
Stefan

[Mathew]

Stefan,

Yes, I'm looking to add text to the currently selected field.

But you bring up an interesting approach, although it's very intrusive because it makes changes to the current document whether I plan to add text to it or not: I could add the OnFocus and OnBlur actions to set a custom property on all text fields. Then I just check for that property in a script that's run from the menu.

Code: Select all

{
let f = this.getField("Text1");
f.setAction("OnFocus", "this.focus=true;");
f.setAction("OnBlur", "this.focus=false;");
}

Unfortunately I think it clobbers the current action (if any) on the field, and I don't think there's a way to access that current action (?), so can't restore it or add to it. Would need to somehow monitor for newly opened document, add the events. I think it's problematic as a general tool though.

[Roman - Tracker Supp]

Hi Mathew,
I do not currently see an non-intrusive way to achieve that. We will consider adding hasFocus property to Field object, as an PDF-XChange extension to the Acrobat JS API.

[Mathew]

Thank you Roman and Stefan. For now, I'll figure out some sort of workaround, but I'll look forward to the day of .hasFocus as an additional property...
- Mathew.

[TrackerSupp-Daniel]

[Roman - Tracker Supp]

I'll look forward to the day of .hasFocus as an additional property...

The property has been implemented and will be available in the next release of the Editor.

[Mathew]

wow great.

[Roman - Tracker Supp]

Actually, we have implemented it as a method, not property, to be more consistent with the existing Acrobat API ( Field.setFocus() ).