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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
The __lookupSetter__ method returns the function bound as a setter to the specified property.
Syntax
obj.__lookupSetter__(sprop)Parameters
sprop- A string containing the name of the property whose setter should be returned.
Return value
The function bound as a setter to the specified property.
Description
If a setter has been defined for an object's property, it was not possible to reference the setter function through that property, because that property refers to the return value of that function. __lookupSetter__ can be used to obtain a reference to the setter function.
It is now possible to do this in a standardized way using Object.getOwnPropertyDescriptor().
Examples
var obj = {
set foo(value) {
this.bar = value;
}
};
// Non-standard and deprecated way
obj.__lookupSetter__('foo')
// (function(value) { this.bar = value; })
// Standard-compliant way
Object.getOwnPropertyDescriptor(obj, 'foo').set;
// (function(value) { this.bar = value; })
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript Latest Draft (ECMA-262) The definition of 'Object.prototype.__lookupSetter__()' in that specification. |
Draft | Included in the (normative) annex for additional ECMAScript legacy features for Web browsers (note that the specification codifies what is already in implementations). |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | 11 | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | ? | ? | (Yes) |