Javascript Object - Syntax Help

Can someone help me with this syntax, I have the following javascript
object:

function foo()
{
this.myFooVar = 0;
this.doThis = function (){
var ao = new AnotherObject();
ao.onReadyStateChange = function(){
if (this.myFooVar == 0) <----------- Here is the
problem
{
// do this
}
}
}
}

How do I refer to the "this.myFooVar" from the foo object when
defining the sub-sub function for on readyStateChange? Did i need to
use a keyword like parent?

Thanks in advance for your help.

-SJ

I

SirCodesALot <sjourdan (AT) gmail (DOT) com> writes:

How do I refer to the "this.myFooVar" from the foo object when
defining the sub-sub function for on readyStateChange? Did i need to
use a keyword like parent?

just use a closure:

function foo()
{
this.myFooVar = 0;
var myFoo = this; // save the this object
this.doThis = function (){
var ao = new AnotherObject();
ao.onReadyStateChange = function(){
if (myFoo.myFooVar == 0) // access it here
{
// do this
}
}
}
}

--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/

Joost Diepenmaat <joost (AT) zeekat (DOT) nl> writes:

just use a closure:

function foo()
{
this.myFooVar = 0;
var myFoo = this; // save the this object
this.doThis = function (){
var ao = new AnotherObject();

var myFoo = this; // or here, which seems like a more
// logical place

ao.onReadyStateChange = function(){
if (myFoo.myFooVar == 0) // access it here
{
// do this
}
}
}
}

Anyway.
HTH

--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/

On Mar 11, 4:10*pm, Joost Diepenmaat <jo... (AT) zeekat (DOT) nl> wrote:

Joost Diepenmaat <jo... (AT) zeekat (DOT) nl> writes:
just use a closure:

function foo()
{
* this.myFooVar = 0;
* var myFoo = this; // save the this object
* this.doThis = function (){
* * * * var ao = new AnotherObject();

* * * * * var myFoo = this; * * // or here, which seems like a more
* * * * * * * * * * * * * * * * // logicalplace

* * * * ao.onReadyStateChange = function(){
* * * * * * * *if (myFoo.myFooVar == 0) *// accessit here
* * * * * * * *{
* * * * * * * * * // do this
* * * * * * * *}
* * * * }
* }
}

Anyway.
HTH

--
Joost Diepenmaat | blog:http://joost.zeekat.nl/| work:http://zeekat.nl/

Thanks a alot for your reponse. Just what I needed!!

On Mar 12, 2:06*am, Joost Diepenmaat <jo... (AT) zeekat (DOT) nl> wrote:

SirCodesALot <sjour... (AT) gmail (DOT) com> writes:
How do I refer to the "this.myFooVar" from the foo object when
defining the sub-sub function for on readyStateChange? Did i need to
use a keyword like parent?

just use a closure:

function foo()
{
* this.myFooVar = 0;
* var myFoo = this; // save the this object
* this.doThis = function (){
* * * * var ao = new AnotherObject();
* * * * ao.onReadyStateChange = function(){
* * * * * * * *if (myFoo.myFooVar == 0) *// access it here
* * * * * * * *{
* * * * * * * * * // do this
* * * * * * * *}
* * * * }
* }

}

--
Joost Diepenmaat | blog:http://joost.zeekat.nl/| work:http://zeekat.nl/

but thats not necessarily a clousre..function being a first class
object in Javascript you can access it using "this"

On Mar 12, 11:16 am, morbidKK wrote:

On Mar 12, 2:06 am, Joost Diepenmaat wrote:
snip
function foo()
{
this.myFooVar = 0;
var myFoo = this; // save the this object
this.doThis = function (){
var ao = new AnotherObject();
ao.onReadyStateChange = function(){
if (myFoo.myFooVar == 0) // access it here
{
// do this
}
}
}

}
snip
but thats not necessarily a clousre.

No, that is a closure (in fact it is two, the first being redundant).

.function being a first class
object in Javascript you can access it using "this"

You can access something using - this -, but what is "it" in this
case? The - this - reference when the - onReadyStateChange - method of
the - AnotherObject - instance is called will most likely be a
reference to the - AnotherObject - instance, and so not a reference to
the - foo - instance that has the - myFooVar - property.