Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The Object.unobserve() method was used to remove observers set by Object.observe(), but has been deprecated and removed from Browsers. You can use the more general Proxy object instead.
Syntax
Object.unobserve(obj, callback)
Parameters
obj- The object to stop observing.
callback- The reference to the observer to stop calling each time changes are made on the object obj.
Return value
The specified object.
Description
Object.unobserve() should be called after Object.observe() in order to remove an observer from an object.
The callback should be a reference to a function and not an anonymous function, because this reference will be used to unset the previous observer. It's useless to call Object.unobserve() with an anonymous function as callback, it will not remove any observer.
Examples
Unobserving an object
var obj = {
foo: 0,
bar: 1
};
var observer = function(changes) {
console.log(changes);
}
Object.observe(obj, observer);
obj.newProperty = 2;
// [{name: 'newProperty', object: <obj>, type: 'add'}]
Object.unobserve(obj, observer);
obj.foo = 1;
// The callback wasn't called
Using an anonymous function
var person = {
name: 'Ahmed',
age: 25
};
Object.observe(person, function(changes) {
console.log(changes);
});
person.age = 40;
// [{name: 'age', object: <obj>, oldValue: 25, type: 'update'}]
Object.unobserve(person, function(changes) {
console.log(changes);
});
person.age = 63;
// [{name: 'age', object: <obj>, oldValue: 40, type: 'update'}]
// The callback will always be called
Specifications
Not part of any standard. Strawman proposal specification.
Browser compatibility
Supported nowhere. Historically supported in Chrome 36 till 52.