It is now possible to use the js:function:: directive for methods.

doc/domains.rst

@@ -553,9 +553,9 @@ The JavaScript domain (name **js**) provides the following directives:
 
 .. directive:: .. js:function:: name(signature)
 
-   Describe a JavaScript function. If you want to document optional
-   arguments use square brackets as :ref:`documented <signatures>` for Python
-   signatures.
+   Describe a JavaScript function, method or constructor. If you want to
+   document optional arguments use square brackets as
+   :ref:`documented <signatures>` for Python signatures.
 
 .. directive:: .. js:data:: name
 

sphinx/domains/javascript.py

@@ -31,7 +31,25 @@ class JSCallable(ObjectDescription):
         match = js_sig_re.match(sig)
         if match is None:
             raise ValueError()
-        obj, name, arglist = match.groups()
+        nameprefix, name, arglist = match.groups()
+
+        objectname = self.env.temp_data.get('js:object')
+        if objectname and nameprefix:
+            # someone documenting the method of an attribute of the current
+            # object? shouldn't happen but who knows...
+            fullname = objectname + '.' + nameprefix + name
+        elif objectname:
+            fullname = objectname + '.' + name
+        elif nameprefix:
+            fullname = nameprefix + '.' + name
+        else:
+            # just a function or constructor
+            objectname = ''
+            fullname = ''
+
+        signode['object'] = objectname
+        signode['fullname'] = fullname
+
 
         signode += addnodes.desc_name(name, name)
         if not arglist:

tests/root/objects.txt

@@ -80,6 +80,9 @@ Javascript items
 
 .. js:data:: bar
 
+.. documenting the method of any object
+.. js:function:: bar.baz()
+
 
 References
 ==========
@@ -96,6 +99,8 @@ Without target: :c:func:`CFunction`. :c:func:`!malloc`.
 :js:func:`foo`
 
 :js:data:`bar`
+:js:func:`bar.baz()`
+:js:func:`bar.baz`
 
 
 Others