1 ## JavaScript-accessible methods
3 A _template_ is a blueprint for JavaScript functions and objects in a context. You can use a template to wrap C++ functions and data structures within JavaScript objects so that they can be manipulated from JavaScript. See the V8 Embedders Guide section on [Templates](https://developers.google.com/v8/embed#templates) for further information.
5 In order to expose functionality to JavaScript via a template, you must provide it to V8 in a form that it understands. Across the versions of V8 supported by NAN, JavaScript-accessible method signatures vary widely, NAN fully abstracts method declaration and provides you with an interface that is similar to the most recent V8 API but is backward-compatible with older versions that still use the now-deceased `v8::Argument` type.
7 * **Method argument types**
8 - <a href="#api_nan_function_callback_info"><b><code>Nan::FunctionCallbackInfo</code></b></a>
9 - <a href="#api_nan_property_callback_info"><b><code>Nan::PropertyCallbackInfo</code></b></a>
10 - <a href="#api_nan_return_value"><b><code>Nan::ReturnValue</code></b></a>
11 * **Method declarations**
12 - <a href="#api_nan_method"><b>Method declaration</b></a>
13 - <a href="#api_nan_getter"><b>Getter declaration</b></a>
14 - <a href="#api_nan_setter"><b>Setter declaration</b></a>
15 - <a href="#api_nan_property_getter"><b>Property getter declaration</b></a>
16 - <a href="#api_nan_property_setter"><b>Property setter declaration</b></a>
17 - <a href="#api_nan_property_enumerator"><b>Property enumerator declaration</b></a>
18 - <a href="#api_nan_property_deleter"><b>Property deleter declaration</b></a>
19 - <a href="#api_nan_property_query"><b>Property query declaration</b></a>
20 - <a href="#api_nan_index_getter"><b>Index getter declaration</b></a>
21 - <a href="#api_nan_index_setter"><b>Index setter declaration</b></a>
22 - <a href="#api_nan_index_enumerator"><b>Index enumerator declaration</b></a>
23 - <a href="#api_nan_index_deleter"><b>Index deleter declaration</b></a>
24 - <a href="#api_nan_index_query"><b>Index query declaration</b></a>
25 * Method and template helpers
26 - <a href="#api_nan_set_method"><b><code>Nan::SetMethod()</code></b></a>
27 - <a href="#api_nan_set_prototype_method"><b><code>Nan::SetPrototypeMethod()</code></b></a>
28 - <a href="#api_nan_set_accessor"><b><code>Nan::SetAccessor()</code></b></a>
29 - <a href="#api_nan_set_named_property_handler"><b><code>Nan::SetNamedPropertyHandler()</code></b></a>
30 - <a href="#api_nan_set_indexed_property_handler"><b><code>Nan::SetIndexedPropertyHandler()</code></b></a>
31 - <a href="#api_nan_set_template"><b><code>Nan::SetTemplate()</code></b></a>
32 - <a href="#api_nan_set_prototype_template"><b><code>Nan::SetPrototypeTemplate()</code></b></a>
33 - <a href="#api_nan_set_instance_template"><b><code>Nan::SetInstanceTemplate()</code></b></a>
34 - <a href="#api_nan_set_call_handler"><b><code>Nan::SetCallHandler()</code></b></a>
35 - <a href="#api_nan_set_call_as_function_handler"><b><code>Nan::SetCallAsFunctionHandler()</code></b></a>
37 <a name="api_nan_function_callback_info"></a>
38 ### Nan::FunctionCallbackInfo
40 `Nan::FunctionCallbackInfo` should be used in place of [`v8::FunctionCallbackInfo`](https://v8docs.nodesource.com/io.js-3.0/dd/d0d/classv8_1_1_function_callback_info.html), even with older versions of Node where `v8::FunctionCallbackInfo` does not exist.
45 template<typename T> class FunctionCallbackInfo {
47 ReturnValue<T> GetReturnValue() const;
48 v8::Local<v8::Function> Callee();
49 v8::Local<v8::Value> Data();
50 v8::Local<v8::Object> Holder();
51 bool IsConstructCall();
53 v8::Local<v8::Value> operator[](int i) const;
54 v8::Local<v8::Object> This() const;
55 v8::Isolate *GetIsolate() const;
59 See the [`v8::FunctionCallbackInfo`](https://v8docs.nodesource.com/io.js-3.0/dd/d0d/classv8_1_1_function_callback_info.html) documentation for usage details on these. See [`Nan::ReturnValue`](#api_nan_return_value) for further information on how to set a return value from methods.
61 <a name="api_nan_property_callback_info"></a>
62 ### Nan::PropertyCallbackInfo
64 `Nan::PropertyCallbackInfo` should be used in place of [`v8::PropertyCallbackInfo`](https://v8docs.nodesource.com/io.js-3.0/d7/dc5/classv8_1_1_property_callback_info.html), even with older versions of Node where `v8::PropertyCallbackInfo` does not exist.
69 template<typename T> class PropertyCallbackInfo : public PropertyCallbackInfoBase<T> {
71 ReturnValue<T> GetReturnValue() const;
72 v8::Isolate* GetIsolate() const;
73 v8::Local<v8::Value> Data() const;
74 v8::Local<v8::Object> This() const;
75 v8::Local<v8::Object> Holder() const;
79 See the [`v8::PropertyCallbackInfo`](https://v8docs.nodesource.com/io.js-3.0/d7/dc5/classv8_1_1_property_callback_info.html) documentation for usage details on these. See [`Nan::ReturnValue`](#api_nan_return_value) for further information on how to set a return value from property accessor methods.
81 <a name="api_nan_return_value"></a>
84 `Nan::ReturnValue` is used in place of [`v8::ReturnValue`](https://v8docs.nodesource.com/io.js-3.0/da/da7/classv8_1_1_return_value.html) on both [`Nan::FunctionCallbackInfo`](#api_nan_function_callback_info) and [`Nan::PropertyCallbackInfo`](#api_nan_property_callback_info) as the return type of `GetReturnValue()`.
89 void EmptyArray(const Nan::FunctionCallbackInfo<v8::Value>& info) {
90 info.GetReturnValue().Set(Nan::New<v8::Array>());
97 template<typename T> class ReturnValue {
100 template <typename S> void Set(const v8::Local<S> &handle);
101 template <typename S> void Set(const Nan::Global<S> &handle);
103 // Fast primitive setters
104 void Set(bool value);
107 void Set(uint32_t i);
109 // Fast JS primitive setters
112 void SetEmptyString();
114 // Convenience getter for isolate
115 v8::Isolate *GetIsolate() const;
119 See the documentation on [`v8::ReturnValue`](https://v8docs.nodesource.com/io.js-3.0/da/da7/classv8_1_1_return_value.html) for further information on this.
121 <a name="api_nan_method"></a>
122 ### Method declaration
124 JavaScript-accessible methods should be declared with the following signature to form a `Nan::FunctionCallback`:
127 typedef void(*FunctionCallback)(const FunctionCallbackInfo<v8::Value>&);
133 void MethodName(const Nan::FunctionCallbackInfo<v8::Value>& info) {
138 You do not need to declare a new `HandleScope` within a method as one is implicitly created for you.
144 class Foo : public Nan::ObjectWrap {
147 static void Bar(const Nan::FunctionCallbackInfo<v8::Value>& info);
148 static void Baz(const Nan::FunctionCallbackInfo<v8::Value>& info);
153 void Foo::Bar(const Nan::FunctionCallbackInfo<v8::Value>& info) {
157 void Foo::Baz(const Nan::FunctionCallbackInfo<v8::Value>& info) {
162 A helper macro `NAN_METHOD(methodname)` exists, compatible with NAN v1 method declarations.
164 **Example usage with `NAN_METHOD(methodname)`**
168 class Foo : public Nan::ObjectWrap {
171 static NAN_METHOD(Bar);
172 static NAN_METHOD(Baz);
177 NAN_METHOD(Foo::Bar) {
181 NAN_METHOD(Foo::Baz) {
186 Use [`Nan::SetPrototypeMethod`](#api_nan_set_prototype_method) to attach a method to a JavaScript function prototype or [`Nan::SetMethod`](#api_nan_set_method) to attach a method directly on a JavaScript object.
188 <a name="api_nan_getter"></a>
189 ### Getter declaration
191 JavaScript-accessible getters should be declared with the following signature to form a `Nan::GetterCallback`:
194 typedef void(*GetterCallback)(v8::Local<v8::String>,
195 const PropertyCallbackInfo<v8::Value>&);
201 void GetterName(v8::Local<v8::String> property,
202 const Nan::PropertyCallbackInfo<v8::Value>& info) {
207 You do not need to declare a new `HandleScope` within a getter as one is implicitly created for you.
209 A helper macro `NAN_GETTER(methodname)` exists, compatible with NAN v1 method declarations.
211 Also see the V8 Embedders Guide documentation on [Accessors](https://developers.google.com/v8/embed#accesssors).
213 <a name="api_nan_setter"></a>
214 ### Setter declaration
216 JavaScript-accessible setters should be declared with the following signature to form a <b><code>Nan::SetterCallback</code></b>:
219 typedef void(*SetterCallback)(v8::Local<v8::String>,
220 v8::Local<v8::Value>,
221 const PropertyCallbackInfo<void>&);
227 void SetterName(v8::Local<v8::String> property,
228 v8::Local<v8::Value> value,
229 const Nan::PropertyCallbackInfo<void>& info) {
234 You do not need to declare a new `HandleScope` within a setter as one is implicitly created for you.
236 A helper macro `NAN_SETTER(methodname)` exists, compatible with NAN v1 method declarations.
238 Also see the V8 Embedders Guide documentation on [Accessors](https://developers.google.com/v8/embed#accesssors).
240 <a name="api_nan_property_getter"></a>
241 ### Property getter declaration
243 JavaScript-accessible property getters should be declared with the following signature to form a <b><code>Nan::PropertyGetterCallback</code></b>:
246 typedef void(*PropertyGetterCallback)(v8::Local<v8::String>,
247 const PropertyCallbackInfo<v8::Value>&);
253 void PropertyGetterName(v8::Local<v8::String> property,
254 const Nan::PropertyCallbackInfo<v8::Value>& info) {
259 You do not need to declare a new `HandleScope` within a property getter as one is implicitly created for you.
261 A helper macro `NAN_PROPERTY_GETTER(methodname)` exists, compatible with NAN v1 method declarations.
263 Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
265 <a name="api_nan_property_setter"></a>
266 ### Property setter declaration
268 JavaScript-accessible property setters should be declared with the following signature to form a <b><code>Nan::PropertySetterCallback</code></b>:
271 typedef void(*PropertySetterCallback)(v8::Local<v8::String>,
272 v8::Local<v8::Value>,
273 const PropertyCallbackInfo<v8::Value>&);
279 void PropertySetterName(v8::Local<v8::String> property,
280 v8::Local<v8::Value> value,
281 const Nan::PropertyCallbackInfo<v8::Value>& info);
284 You do not need to declare a new `HandleScope` within a property setter as one is implicitly created for you.
286 A helper macro `NAN_PROPERTY_SETTER(methodname)` exists, compatible with NAN v1 method declarations.
288 Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
290 <a name="api_nan_property_enumerator"></a>
291 ### Property enumerator declaration
293 JavaScript-accessible property enumerators should be declared with the following signature to form a <b><code>Nan::PropertyEnumeratorCallback</code></b>:
296 typedef void(*PropertyEnumeratorCallback)(const PropertyCallbackInfo<v8::Array>&);
302 void PropertyEnumeratorName(const Nan::PropertyCallbackInfo<v8::Array>& info);
305 You do not need to declare a new `HandleScope` within a property enumerator as one is implicitly created for you.
307 A helper macro `NAN_PROPERTY_ENUMERATOR(methodname)` exists, compatible with NAN v1 method declarations.
309 Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
311 <a name="api_nan_property_deleter"></a>
312 ### Property deleter declaration
314 JavaScript-accessible property deleters should be declared with the following signature to form a <b><code>Nan::PropertyDeleterCallback</code></b>:
317 typedef void(*PropertyDeleterCallback)(v8::Local<v8::String>,
318 const PropertyCallbackInfo<v8::Boolean>&);
324 void PropertyDeleterName(v8::Local<v8::String> property,
325 const Nan::PropertyCallbackInfo<v8::Boolean>& info);
328 You do not need to declare a new `HandleScope` within a property deleter as one is implicitly created for you.
330 A helper macro `NAN_PROPERTY_DELETER(methodname)` exists, compatible with NAN v1 method declarations.
332 Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
334 <a name="api_nan_property_query"></a>
335 ### Property query declaration
337 JavaScript-accessible property query methods should be declared with the following signature to form a <b><code>Nan::PropertyQueryCallback</code></b>:
340 typedef void(*PropertyQueryCallback)(v8::Local<v8::String>,
341 const PropertyCallbackInfo<v8::Integer>&);
347 void PropertyQueryName(v8::Local<v8::String> property,
348 const Nan::PropertyCallbackInfo<v8::Integer>& info);
351 You do not need to declare a new `HandleScope` within a property query method as one is implicitly created for you.
353 A helper macro `NAN_PROPERTY_QUERY(methodname)` exists, compatible with NAN v1 method declarations.
355 Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
357 <a name="api_nan_index_getter"></a>
358 ### Index getter declaration
360 JavaScript-accessible index getter methods should be declared with the following signature to form a <b><code>Nan::IndexGetterCallback</code></b>:
363 typedef void(*IndexGetterCallback)(uint32_t,
364 const PropertyCallbackInfo<v8::Value>&);
370 void IndexGetterName(uint32_t index, const PropertyCallbackInfo<v8::Value>& info);
373 You do not need to declare a new `HandleScope` within a index getter as one is implicitly created for you.
375 A helper macro `NAN_INDEX_GETTER(methodname)` exists, compatible with NAN v1 method declarations.
377 Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
379 <a name="api_nan_index_setter"></a>
380 ### Index setter declaration
382 JavaScript-accessible index setter methods should be declared with the following signature to form a <b><code>Nan::IndexSetterCallback</code></b>:
385 typedef void(*IndexSetterCallback)(uint32_t,
386 v8::Local<v8::Value>,
387 const PropertyCallbackInfo<v8::Value>&);
393 void IndexSetterName(uint32_t index,
394 v8::Local<v8::Value> value,
395 const PropertyCallbackInfo<v8::Value>& info);
398 You do not need to declare a new `HandleScope` within a index setter as one is implicitly created for you.
400 A helper macro `NAN_INDEX_SETTER(methodname)` exists, compatible with NAN v1 method declarations.
402 Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
404 <a name="api_nan_index_enumerator"></a>
405 ### Index enumerator declaration
407 JavaScript-accessible index enumerator methods should be declared with the following signature to form a <b><code>Nan::IndexEnumeratorCallback</code></b>:
410 typedef void(*IndexEnumeratorCallback)(const PropertyCallbackInfo<v8::Array>&);
416 void IndexEnumeratorName(const PropertyCallbackInfo<v8::Array>& info);
419 You do not need to declare a new `HandleScope` within a index enumerator as one is implicitly created for you.
421 A helper macro `NAN_INDEX_ENUMERATOR(methodname)` exists, compatible with NAN v1 method declarations.
423 Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
425 <a name="api_nan_index_deleter"></a>
426 ### Index deleter declaration
428 JavaScript-accessible index deleter methods should be declared with the following signature to form a <b><code>Nan::IndexDeleterCallback</code></b>:
431 typedef void(*IndexDeleterCallback)(uint32_t,
432 const PropertyCallbackInfo<v8::Boolean>&);
438 void IndexDeleterName(uint32_t index, const PropertyCallbackInfo<v8::Boolean>& info);
441 You do not need to declare a new `HandleScope` within a index deleter as one is implicitly created for you.
443 A helper macro `NAN_INDEX_DELETER(methodname)` exists, compatible with NAN v1 method declarations.
445 Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
447 <a name="api_nan_index_query"></a>
448 ### Index query declaration
450 JavaScript-accessible index query methods should be declared with the following signature to form a <b><code>Nan::IndexQueryCallback</code></b>:
453 typedef void(*IndexQueryCallback)(uint32_t,
454 const PropertyCallbackInfo<v8::Integer>&);
460 void IndexQueryName(uint32_t index, const PropertyCallbackInfo<v8::Integer>& info);
463 You do not need to declare a new `HandleScope` within a index query method as one is implicitly created for you.
465 A helper macro `NAN_INDEX_QUERY(methodname)` exists, compatible with NAN v1 method declarations.
467 Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
469 <a name="api_nan_set_method"></a>
472 Sets a method with a given name directly on a JavaScript object where the method has the `Nan::FunctionCallback` signature (see <a href="#api_nan_method">Method declaration</a>).
477 void Nan::SetMethod(v8::Local<v8::Object> recv,
479 Nan::FunctionCallback callback)
480 void Nan::SetMethod(v8::Local<v8::Template> templ,
482 Nan::FunctionCallback callback)
485 <a name="api_nan_set_prototype_method"></a>
486 ### Nan::SetPrototypeMethod()
488 Sets a method with a given name on a `FunctionTemplate`'s prototype where the method has the `Nan::FunctionCallback` signature (see <a href="#api_nan_method">Method declaration</a>).
493 void Nan::SetPrototypeMethod(v8::Local<v8::FunctionTemplate> recv,
495 Nan::FunctionCallback callback)
498 <a name="api_nan_set_accessor"></a>
499 ### Nan::SetAccessor()
501 Sets getters and setters for a property with a given name on an `ObjectTemplate` or a plain `Object`. Accepts getters with the `Nan::GetterCallback` signature (see <a href="#api_nan_getter">Getter declaration</a>) and setters with the `Nan::SetterCallback` signature (see <a href="#api_nan_setter">Setter declaration</a>).
506 void SetAccessor(v8::Local<v8::ObjectTemplate> tpl,
507 v8::Local<v8::String> name,
508 Nan::GetterCallback getter,
509 Nan::SetterCallback setter = 0,
510 v8::Local<v8::Value> data = v8::Local<v8::Value>(),
511 v8::AccessControl settings = v8::DEFAULT,
512 v8::PropertyAttribute attribute = v8::None,
513 imp::Sig signature = imp::Sig());
514 bool SetAccessor(v8::Local<v8::Object> obj,
515 v8::Local<v8::String> name,
516 Nan::GetterCallback getter,
517 Nan::SetterCallback setter = 0,
518 v8::Local<v8::Value> data = v8::Local<v8::Value>(),
519 v8::AccessControl settings = v8::DEFAULT,
520 v8::PropertyAttribute attribute = v8::None)
523 See the V8 [`ObjectTemplate#SetAccessor()`](https://v8docs.nodesource.com/io.js-3.0/db/d5f/classv8_1_1_object_template.html#aa90691622f01269c6a11391d372ca0c5) and [`Object#SetAccessor()`](https://v8docs.nodesource.com/io.js-3.0/db/d85/classv8_1_1_object.html#a3f9dee085f5ec346465f1dc924325043) for further information about how to use `Nan::SetAccessor()`.
525 <a name="api_nan_set_named_property_handler"></a>
526 ### Nan::SetNamedPropertyHandler()
528 Sets named property getters, setters, query, deleter and enumerator methods on an `ObjectTemplate`. Accepts:
530 * Property getters with the `Nan::PropertyGetterCallback` signature (see <a href="#api_nan_property_getter">Property getter declaration</a>)
531 * Property setters with the `Nan::PropertySetterCallback` signature (see <a href="#api_nan_property_setter">Property setter declaration</a>)
532 * Property query methods with the `Nan::PropertyQueryCallback` signature (see <a href="#api_nan_property_query">Property query declaration</a>)
533 * Property deleters with the `Nan::PropertyDeleterCallback` signature (see <a href="#api_nan_property_deleter">Property deleter declaration</a>)
534 * Property enumerators with the `Nan::PropertyEnumeratorCallback` signature (see <a href="#api_nan_property_enumerator">Property enumerator declaration</a>)
539 void SetNamedPropertyHandler(v8::Local<v8::ObjectTemplate> tpl,
540 Nan::PropertyGetterCallback getter,
541 Nan::PropertySetterCallback setter = 0,
542 Nan::PropertyQueryCallback query = 0,
543 Nan::PropertyDeleterCallback deleter = 0,
544 Nan::PropertyEnumeratorCallback enumerator = 0,
545 v8::Local<v8::Value> data = v8::Local<v8::Value>())
548 See the V8 [`ObjectTemplate#SetNamedPropertyHandler()`](https://v8docs.nodesource.com/io.js-3.0/db/d5f/classv8_1_1_object_template.html#a34d1cc45b642cd131706663801aadd76) for further information about how to use `Nan::SetNamedPropertyHandler()`.
550 <a name="api_nan_set_indexed_property_handler"></a>
551 ### Nan::SetIndexedPropertyHandler()
553 Sets indexed property getters, setters, query, deleter and enumerator methods on an `ObjectTemplate`. Accepts:
555 * Indexed property getters with the `Nan::IndexGetterCallback` signature (see <a href="#api_nan_index_getter">Index getter declaration</a>)
556 * Indexed property setters with the `Nan::IndexSetterCallback` signature (see <a href="#api_nan_index_setter">Index setter declaration</a>)
557 * Indexed property query methods with the `Nan::IndexQueryCallback` signature (see <a href="#api_nan_index_query">Index query declaration</a>)
558 * Indexed property deleters with the `Nan::IndexDeleterCallback` signature (see <a href="#api_nan_index_deleter">Index deleter declaration</a>)
559 * Indexed property enumerators with the `Nan::IndexEnumeratorCallback` signature (see <a href="#api_nan_index_enumerator">Index enumerator declaration</a>)
564 void SetIndexedPropertyHandler(v8::Local<v8::ObjectTemplate> tpl,
565 Nan::IndexGetterCallback getter,
566 Nan::IndexSetterCallback setter = 0,
567 Nan::IndexQueryCallback query = 0,
568 Nan::IndexDeleterCallback deleter = 0,
569 Nan::IndexEnumeratorCallback enumerator = 0,
570 v8::Local<v8::Value> data = v8::Local<v8::Value>())
573 See the V8 [`ObjectTemplate#SetIndexedPropertyHandler()`](https://v8docs.nodesource.com/io.js-3.0/db/d5f/classv8_1_1_object_template.html#ac0234cbede45d51778bb5f6a32a9e125) for further information about how to use `Nan::SetIndexedPropertyHandler()`.
575 <a name="api_nan_set_template"></a>
576 ### Nan::SetTemplate()
578 Adds properties on an `Object`'s or `Function`'s template.
583 void Nan::SetTemplate(v8::Local<v8::Template> templ,
585 v8::Local<v8::Data> value);
586 void Nan::SetTemplate(v8::Local<v8::Template> templ,
587 v8::Local<v8::String> name,
588 v8::Local<v8::Data> value,
589 v8::PropertyAttribute attributes)
592 Calls the `Template`'s [`Set()`](https://v8docs.nodesource.com/io.js-3.0/db/df7/classv8_1_1_template.html#a2db6a56597bf23c59659c0659e564ddf).
594 <a name="api_nan_set_prototype_template"></a>
595 ### Nan::SetPrototypeTemplate()
597 Adds properties on an `Object`'s or `Function`'s prototype template.
602 void Nan::SetPrototypeTemplate(v8::Local<v8::FunctionTemplate> templ,
604 v8::Local<v8::Data> value);
605 void Nan::SetPrototypeTemplate(v8::Local<v8::FunctionTemplate> templ,
606 v8::Local<v8::String> name,
607 v8::Local<v8::Data> value,
608 v8::PropertyAttribute attributes)
611 Calls the `FunctionTemplate`'s _PrototypeTemplate's_ [`Set()`](https://v8docs.nodesource.com/io.js-3.0/db/df7/classv8_1_1_template.html#a2db6a56597bf23c59659c0659e564ddf).
613 <a name="api_nan_set_instance_template"></a>
614 ### Nan::SetInstanceTemplate()
616 Use to add instance properties on `FunctionTemplate`'s.
621 void Nan::SetInstanceTemplate(v8::Local<v8::FunctionTemplate> templ,
623 v8::Local<v8::Data> value);
624 void Nan::SetInstanceTemplate(v8::Local<v8::FunctionTemplate> templ,
625 v8::Local<v8::String> name,
626 v8::Local<v8::Data> value,
627 v8::PropertyAttribute attributes)
630 Calls the `FunctionTemplate`'s _InstanceTemplate's_ [`Set()`](https://v8docs.nodesource.com/io.js-3.0/db/df7/classv8_1_1_template.html#a2db6a56597bf23c59659c0659e564ddf).
632 <a name="api_nan_set_call_handler"></a>
633 ### Nan::SetCallHandler()
635 Set the call-handler callback for a `v8::FunctionTemplate`.
636 This callback is called whenever the function created from this FunctionTemplate is called.
641 void Nan::SetCallHandler(v8::Local<v8::FunctionTemplate> templ, Nan::FunctionCallback callback, v8::Local<v8::Value> data = v8::Local<v8::Value>())
644 Calls the `FunctionTemplate`'s [`SetCallHandler()`](https://v8docs.nodesource.com/io.js-3.0/d8/d83/classv8_1_1_function_template.html#a26cf14e36aa1a47091b98536d08ea821).
646 <a name="api_nan_set_call_as_function_handler"></a>
647 ### Nan::SetCallAsFunctionHandler()
649 Sets the callback to be used when calling instances created from the `v8::ObjectTemplate` as a function.
650 If no callback is set, instances behave like normal JavaScript objects that cannot be called as a function.
655 void Nan::SetCallAsFunctionHandler(v8::Local<v8::ObjectTemplate> templ, Nan::FunctionCallback callback, v8::Local<v8::Value> data = v8::Local<v8::Value>())
658 Calls the `ObjectTemplate`'s [`SetCallAsFunctionHandler()`](https://v8docs.nodesource.com/io.js-3.0/db/d5f/classv8_1_1_object_template.html#ae0a0e72fb0c5e5f32e255fe5bcc7316a).