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I read here that "self Refers to the current window or form".
Self does not seem to refer to the current form in this case:
<form><input type="text" onkeyup="alert(self.foo.value)" name="foo"></form> However in this case it works (referring to the window):
<form><input type="text" onkeyup="alert(self.document.forms[0].foo.value)" name="foo"></form> So when would you use the self DOM property over just window?
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In the Window object, top references the topmost window. While self references the current window.
So, within the inner function, "this" refers to the object calling the inner function while "self" refers to the object which called the outer function to create the reference to the inner function.
var self = this; In the JavaScript, “self” is a pattern to maintaining a reference to the original “this” keyword and also we can say that this is a technique to handle the events.
The Window. self read-only property returns the window itself, as a WindowProxy . It can be used with dot notation on a window object (that is, window. self ) or standalone ( self ).
Other replies have pointed out that self is not going to refer to the FORM and that self is window. They're right; self is window. Well, except when it isn't. In either IE6 or IE7 (forgot), self.onload would not fire, though window.onload would.
All official versions of IE (and even IE9pr3) have an odd, intransitive implementation of == with these host objects. Using == to compare either window or self to a node in the document, the result is true.
IE Oddities
alert(self == document.body); // true alert(document.body == self); // false alert(window == self); // true alert(window === self); //false var b = document.createElement("b"); alert(window == b); // false alert(window == document.body.appendChild(b)); // true alert(window == document.body.removeChild(b)); // false
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