Free Javascript Editorqueentree
Example
It has different values depending on where it is used: In a method, this refers to the owner object. Alone, this refers to the global object. In a function, this refers to the global object. In a function, in strict mode, this is undefined. In an event, this refers to the element that received the event. Methods like call, and apply can refer this to any object. Apr 20, 2018 The JavaScript language itself is built into all the browsers you need for testing the scripts, and there are plenty of free JavaScript downloads of complete scripts and libraries that you can either use as is or examine to see how things work in order to write your own code. The javascript (misspelled as java script) is given under GPL License; i.e. Free use for those who use the codes as it is. Free, if your modification does not remove our copyright information and links. Click Here for detailed license information. You can purchase the script if your requirements does not meet our GPL License terms.
firstName: 'John',
lastName : 'Doe',
id : 5566,
fullName : function() {
return this.firstName + ' ' + this.lastName;
}
};
What is this?
The JavaScript this
keyword refers to the object it belongs to.
It has different values depending on where it is used:
- In a method,
this
refers to the owner object. - Alone,
this
refers to the global object. - In a function,
this
refers to the global object. - In a function, in strict mode,
this
isundefined
. - In an event,
this
refers to the element that received the event. - Methods like
call()
, andapply()
can referthis
to any object.
this in a Method
In an object method, this
refers to the 'owner' of the method.
In the example on the top of this page, this
refers to the person object.
The person object is the owner of the fullName method.
return this.firstName + ' ' + this.lastName;
}
this Alone
When used alone, the owner is the Global object, so this
refers to the Global object.
In a browser window the Global object is [object Window]
:
Example
Try it Yourself »Free Javascript Editor Queen Tree Pictures
In strict mode, when used alone, this
also refers to the Global object [object Window]
:
Example
Try it Yourself »this in a Function (Default)
In a JavaScript function, the owner of the function is the default binding for this
.
So, in a function, this
refers to the Global object [object Window]
.
Example
Try it Yourself »this in a Function (Strict)
JavaScript strict mode does not allow default binding.
So, when used in a function, in strict mode, this
is undefined
.
Online Javascript Editor
Example
function myFunction() {
return this;
}
this in Event Handlers
In HTML event handlers, this
refers to the HTML element that received the event:
Example
Click to Remove Me!
</button>
Object Method Binding
In these examples, this
is the person object (The person object is the 'owner' of the function):
Example
firstName : 'John',
lastName : 'Doe',
id : 5566,
myFunction : function() {
return this;
}
};
Example
firstName: 'John',
lastName : 'Doe',
id : 5566,
fullName : function() {
return this.firstName + ' ' + this.lastName;
}
};
In other words: this.firstName means the firstName property of this (person) object.
Explicit Function Binding
The call()
and apply()
methods are predefined JavaScript methods.
They can both be used to call an object method with another object as argument.
You can read more about call()
and apply()
later in this tutorial.
In the example below, when calling person1.fullName with person2 as argument, this
will refer to person2, even if it is a method of person1:
Example
fullName: function() {
return this.firstName + ' ' + this.lastName;
}
}
var person2 = {
firstName:'John',
lastName: 'Doe',
}
person1.fullName.call(person2); // Will return 'John Doe'
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