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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. Do not use it in old or new projects. Pages or Web apps using it may break 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 2017 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 | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | 11 | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | ? | ? | (Yes) |