Re: Process to make an NVDA app-specific addon for a web-based application

Noelia Ruiz

Thanks a lot Julien. I'm very interested in your add-on.
placeMarkers works in browse mode documents. It saves and searches
bookmarks and strings of text in files whose names deppend on the
following code, in case you are curious or maybe useful.
I will clone and explore your add-on, of course.
Piece of code of placeMarkers:

file =
obj = api.getFocusObject()
obj = obj.treeInterceptor.rootNVDAObject
childID = obj.IAccessibleChildID
iAObj = obj.IAccessibleObject
accValue = iAObj.accValue(childID)
nameToAdd = " - %s" % accValue.split("#")[0].split("/")[-1].split("\\")[-1]
nameToAdd = ""
file = file.rsplit(" - ", 1)[0]
file = file.split("\\")[-1]
file += nameToAdd
file = standardFileName(file)
folderPath = os.path.join(PLACE_MARKERS_PATH, folder)
maxLenFileName = 232-len(folderPath)
if maxLenFileName <= 0:
return ""
file = file[:maxLenFileName]
file = file+ext
path = os.path.join(folderPath, file)
return path

2020-06-18 7:21 GMT+02:00, Julien Cochuyt <j.cochuyt@...>:


I am a French IT professional specialized in accessibility and core NVDA
As Joseph pointed out, there is no native support in NVDA for the use case
you describe.
However, some add-ons can come in handy.

My company - with support of the french employment agency and the
governmental central IT agency - is developing WebAccess, an add-on for
NVDA that allows to easily implement alternative behaviors based on URL
matching and DOM elements selection.
It handles, through simple form-filling, definition of new shortcuts,
automatic announcement of content or restructuring of pages with basic
transformations to create regions, titles, and the like.
It also serves as a framework to implement new specific behaviors
through code.
Centered around WebModules - our web app equivalent of NVDA's AppModules -
it currently supports Internet Explorer 11, Mozilla Firefox and Google
Chrome. Support of Microsoft Edge is still a work in progress.

For the past five years, we're successfully using it to develop add-ons
targeting business web applications, for the sake of visually impaired
workers productivity.
Still under active development, it is already used by our network of fellow
professionals but not yet quite ready for use by the general public.
We're aiming at a general public launch near the end of 2020, most likely
during NVDA Con.

GitHub repo:

As Noelia pointed out, another alternative worth considering is the
PlaceMarkers add-on, though I'm less aware of its current feature-scope.

Best regards,

Julien Cochuyt

Le mer. 17 juin 2020 à 19:58, Julie Stoltz <jstoltz@...> a écrit :

Hi all,

I am very new to this group and the NVDA application, and I apologize if
have missed anything critical in the steps to address this.

I searched the archives and development guide and did not find an answer
to my question.

Our company provides a web-based app to our clients. I have been looking
into NVDA and I see that it can be used to create application-specific
behavior. However, such addons are named for the executable file that
the application. In our case, our application is opened with a web
in an Internet Explorer 11 browser.

Can NVDA work with domain-specific web applications? If so, how should
addon be named? Are there any config settings I could use to create an
alias (I believe this is how JAWS addresses this issue)?

I know I can create an addon for IE itself, but that option would likely
interfere with other sites or applications run through IE, so I don’t
to go that route unless absolutely necessary.

Any guidance at all is greatly appreciated.

Julie Stoltz

Technical Communications Specialist

Cycom Data Systems, Inc.


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