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Deprecated
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. 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
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic support | Chrome Full support Yes | Edge Full support Yes | Firefox Full support 1 | IE Full support 11 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes |
Legend
- Full support
- Full support
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.