Just a short example of the cause:
function Car(){
this.type = 'Volkswagen Touraeq V12 Diesel'
// just love this car.. sorry..
this.draw();
}
Car.prototype = {
draw : function(){
this.element = document.createElement('A');
}
}
var simsalabim = new Car();
This creates a JavaScript object, respectively "Car". This is maintained
in the Javascript GC.
Then in the draw method the element A is created, respectively a DOM
object. This is maintained in the browser GC.
Once you remove the object Car, the Javascript GC releases the Car
object from memory. But.... the A element in the browser GC is still
active/referenced. This part of the deal is never released unless you
set the reference to null.
Same happens in the other way, once you remove the element A from the
page with removeChild, the Car object still exists, and this.element
still holds a reference to that A element despite it does not exist.
Both GC's don't communicate with each other, they don't know about each
other either.
That is what is causing memory management issues. Is this a bit clear?
:) You might understand this starts out simple, but increases in
complexity on larger complex applications.
Micha Schopman
Project Manager
Modern Media, Databankweg 12 M, 3821 AL Amersfoort
Tel 033-4535377, Fax 033-4535388
KvK Amersfoort 39081679, Rabo 39.48.05.380
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