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Finds a specified property of an object and gets a detailed description of that property.
Syntax
bool JS_GetPropertyDescriptor(JSContext *cx, JS::HandleObject obj, const char *name, JS::MutableHandle<JSPropertyDescriptor> desc); // Added in SpiderMonkey 31 bool JS_GetPropertyDescriptorById(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::MutableHandle<JSPropertyDescriptor> desc);
Name | Type | Description |
---|---|---|
cx |
JSContext * |
A context. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext . |
obj |
JS::HandleObject |
The object to search for the property. |
id |
const char * or JS::HandleId |
The name of the property to look up. |
desc |
JS::MutableHandle<JSPropertyDescriptor> |
Out parameter. On success, if no property is found, desc->obj is set to NULL . If a property is found, *desc receives a description of it. |
Description
JS_GetPropertyDescriptor
and JS_GetPropertyDescriptorById
find a specified property of an object and gets a detailed description of that property on the prototype chain (returned in desc->obj
). If desc->obj
is null, then this property was not found on the prototype chain.
See also
- MXR ID Search for
JS_GetPropertyDescriptor
- MXR ID Search for
JS_GetPropertyDescriptorById
JS_GetOwnPropertyDescriptor
JS_GetOwnPropertyDescriptorById
JSPropertyDescriptor
- bug 482381 - added
JS_GetPropertyDescriptorById
- bug 893186 - added
JS_GetPropertyDescriptor