CODEWITHSUNDEEP
javascript
Max Koretskyi
Max Koretskyi

Reputation: 105499

Get access to object's method without referencing 'this' keyword

I'm exploring some code written for desktop application and it's using ScriptControl object to access method of a global object (which doesn't require specifying the this keyword). I'm wondering how this can be done without the usage of ScriptControl. Here is the sample code:

var i = function() {success()};

(function(f) {
    var o = {"success": function() {alert('success')}};
    f.apply(o); // fails because 'success' method is referenced inside 'f' by itself
})(i);

So is there any way I can access "success" method of parent without specifying the this keyword?

Upvotes: 0

Views: 63

Answers (2)

Bergi
Bergi

Reputation: 664513

You can overwrite that global success variable that i references:

var success;

var i = function() {success()};

(function(f) {
    // Assuming you have access the the scope where `success` is defined
    // which is true for the global scope in this example
    success = function() {alert('success')};
    f();
})(i);

However, that looks hacky. If you're designing an API, it would be better to pass the callback function as a parameter to i.

Upvotes: 1

user2736012
user2736012

Reputation: 3543

Don't use .apply()?

var i = function(obj) {obj.success()};

(function(f) {
    var o = {"success": function() {alert('success')}};
    f(o);
})(i);

Tell you what, here's another way.

var i = function() {i.o.success()};

(function(f) {
    var o = {"success": function() {alert('success')}};
    f.o = o;
    f();
})(i);

Upvotes: 1

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