Hi, this sometimes happens in other programming languages too. What you can do is try something like: t=this; or var t=this; The second solution would make a local reference to 'this' (the first t would be global). So in the onChange function you could try t.testVar. >From what i remember about Javascript t should only be a reference to the actual object, so it will be an up-to-date object.
Hope this helps, Teo On Sep 2, 6:29 pm, Daidalos <[email protected]> wrote: > Hi all, > > I have a bit of a problem with the onreadystatechange function of the > XMLHttpRequest. > > I have an object with methods to download an image and to do something > with it after the download is finished. > The downloading is working fine, but when the onreadystatechange > function is called the variable "this" does not point to the object. > As if the method was somehow called "outside" the object. > > To clearify see the following code (it is just a sample to demostrate > the problem): > > > > > > > function createObject(){ > > this.testVar = "test text"; > > this.testDownload = function (){ > > this.req = new XMLHttpRequest(); > > this.req.open("GET", "http://www.google.com/webhp";, true); > > this.req.onreadystatechange = this.onChange; > > this.req.send(); > > }; > > this.onChange = function (){ > > alert(testObject.testVar); > > alert(this.testVar); > > alert(typeof(this)); > > alert(typeof(this.testVar)); > > } > > } > > function view_onOpen() { > > testObject = new createObject(); > > testObject.testDownload(); > > } > > When the function view_onOpen() is executed the first alert contains > the expacted "test text" but the second alert is just blank. typeof > (this) retruns "object" but typeof(this.testVar) returns "undefined". > > What can I do to make it work, does anybody have an idea? > > thanks and best regards > -Viktor --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Desktop Developer Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-desktop-developer?hl=en -~----------~----~----~----~------~----~------~--~---
