I'm probably developing too late, I should have thought of the missing binding. But thanks a lot for the nice explanations, I was missing the theoretical part here (I'm just a lazy reader).
Cheers, Matthieu On Jul 18, 1:08 am, "Mark Holton" <[EMAIL PROTECTED]> wrote: > Matt ...in addition to utilizing Prototype's bind in the manner Chris > described ... you might also want to reference/read up on > 'closures<http://www.jibbering.com/faq/faq_notes/closures.html>' > in > JavaScript<http://www.amazon.com/JavaScript-Definitive-Guide-David-Flanagan/dp/0...>, > as JS closures are related to Prototype's bind. > > cheers- > > On 7/18/07, Christophe Porteneuve <[EMAIL PROTECTED]> wrote: > > > > > Matt a écrit : > > > I'm having some difficulty with the periodical executer, I use it > > > within one of my objects and when I use 'this' it doesn't actually > > > reference the object. Here is the example: > > > Binding 101, Matt. Change your initialize line: > > > > new PeriodicalExecuter(this.pollRadio, 2); > > > To this: > > > > new PeriodicalExecuter(this.pollRadio.bind(this), 2); > > > BTW, you may probably want to store that PE ref somewhere in case you > > need to stop the PE from running at some point. > > > > However I have no idea with the reference to 'this' isn't the right > > > one and there's probably a better way. Any idea? If there's no better > > > Look athttp://prototypejs.org/api/function/bindor grab some good JS > > book (or mine, for that matter) and read on "this", execution contexts, > > binding, etc. > > > Essentially, the trick is: whenever you pass a method reference around, > > it loses its "this", okay? The only way for a method to be properly > > bound to an instance is to call it directly on the instance (e.g. > > "this.method(a, b)" or "someObj.method(a, b)". Anything else will lose > > the binding. > > > Prototype provides a bind method for functions that spews out an > > anonymous function (not associated to your original object in itself, so > > you can safely pass it around), and this new function essentially makes > > sure to call your original method on its proper instance. > > > -- > > Christophe Porteneuve a.k.a. TDD > > "[They] did not know it was impossible, so they did it." --Mark Twain > > Email: [EMAIL PROTECTED] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Spinoffs" group. To post to this group, send email to rubyonrails-spinoffs@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/rubyonrails-spinoffs?hl=en -~----------~----~----~----~------~----~------~--~---
