I have the class below. Trying to do a simple rollover class.
var Rollover = Class.create();
Rollover.prototype = {
initialize: function(className) {
$$(className).each(function(x) {
x.mouseover = this.doHover.bindAsEventListener(this);
});
},
doHover: function(e) {
alert("over");
}
};
It errors on the line (x.mouseover this.doHover.bindAsEventListener(this);)
with the following message:
this.doHover has no properties
Any ideas why? I''ve used the bindAseventListener before, and
haven''t
seen this error. Its probably something painfully obvious that I''m
missing or forgetting...
Thanks
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In the line:
x.mouseover = this.doHover.bindAsEventListener(this)
this doesn''t refer to what you''re thinking. It''s
inside the closure, which
changes the scope chain.
Rollover.prototype = {
initialize: function(className) {
var doHover = this.doHover.bindAsEventListener(this);
$$(className).each(function(x) {
x.mouseover = doHover;
});
},
doHover: function(e) {
alert("over");
}
};
Will do what you''re looking to do.
On 11/9/06, Bryce Fischer
<bryce-bKrBQupY3dcvEkJ3hUJ36NBPR1lH4CV8@public.gmane.org>
wrote:>
>
> I have the class below. Trying to do a simple rollover class.
>
> var Rollover = Class.create();
>
> Rollover.prototype = {
> initialize: function(className) {
> $$(className).each(function(x) {
> x.mouseover = this.doHover.bindAsEventListener
> (this);
> });
> },
> doHover: function(e) {
> alert("over");
> }
> };
>
> It errors on the line (x.mouseover >
this.doHover.bindAsEventListener(this);) with the following message:
> this.doHover has no properties
>
> Any ideas why? I''ve used the bindAseventListener before, and
haven''t
> seen this error. Its probably something painfully obvious that I''m
> missing or forgetting...
>
> Thanks
>
> >
>
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Rollover.prototype = {
initialize: function(className) {
$$(className).each(function(x) {
x.mouseover = this.doHover.bindAsEventListener
(this);
}.bind(this));
},
doHover: function(e) {
alert("over");
}
};
just another way ;)
brgds,
sigi
On 11/9/06, Jay Miller
<heinousjay-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> In the line:
> x.mouseover = this.doHover.bindAsEventListener(this)
> this doesn''t refer to what you''re thinking.
It''s inside the closure,
> which changes the scope chain.
>
> Rollover.prototype = {
> initialize: function(className) {
> var doHover = this.doHover.bindAsEventListener(this);
> $$(className).each(function(x) {
> x.mouseover = doHover;
> });
> },
> doHover: function(e) {
> alert("over");
> }
> };
>
> Will do what you''re looking to do.
>
> On 11/9/06, Bryce Fischer <
bryce-bKrBQupY3dcvEkJ3hUJ36NBPR1lH4CV8@public.gmane.org> wrote:
> >
> >
> > I have the class below. Trying to do a simple rollover class.
> >
> > var Rollover = Class.create();
> >
> > Rollover.prototype = {
> > initialize: function(className) {
> > $$(className).each(function(x) {
> > x.mouseover =
this.doHover.bindAsEventListener(this);
> > });
> > },
> > doHover: function(e) {
> > alert("over");
> > }
> > };
> >
> > It errors on the line (x.mouseover > >
this.doHover.bindAsEventListener (this);) with the following message:
> > this.doHover has no properties
> >
> > Any ideas why? I''ve used the bindAseventListener before, and
haven''t
> > seen this error. Its probably something painfully obvious that
I''m
> > missing or forgetting...
> >
> > Thanks
> >
> >
> > > >
> >
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Thank you. That worked. On 11/9/06, Jay Miller <heinousjay-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> In the line: > x.mouseover = this.doHover.bindAsEventListener(this) > > this doesn''t refer to what you''re thinking. It''s inside the closure, which > changes the scope chain. > > Rollover.prototype = { > initialize: function(className) { > var doHover > this.doHover.bindAsEventListener(this); > $$(className).each(function(x) { > x.mouseover = doHover; > }); > }, > doHover: function(e) { > alert("over"); > } > }; > > Will do what you''re looking to do. > > > On 11/9/06, Bryce Fischer < bryce-bKrBQupY3dcvEkJ3hUJ36NBPR1lH4CV8@public.gmane.org> wrote: > > > > > > I have the class below. Trying to do a simple rollover class. > > > > var Rollover = Class.create(); > > > > Rollover.prototype = { > > initialize: function(className) { > > $$(className).each(function(x) { > > x.mouseover > this.doHover.bindAsEventListener (this); > > }); > > }, > > doHover: function(e) { > > alert("over"); > > } > > }; > > > > It errors on the line (x.mouseover > > this.doHover.bindAsEventListener (this);) with the > following message: > > this.doHover has no properties > > > > Any ideas why? I''ve used the bindAseventListener before, and haven''t > > seen this error. Its probably something painfully obvious that I''m > > missing or forgetting... > > > > Thanks > > > > > > > > > > >--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-spinoffs?hl=en -~----------~----~----~----~------~----~------~--~---
Jay Miller wrote:> In the line: > x.mouseover = this.doHover.bindAsEventListener(this) > this doesn''t refer to what you''re thinking. It''s inside the closure, which > changes the scope chain.The value of a function''s this keyword is not affected by, nor does it have any effect on, the scope chain. Its value is determined *only* by how the function is called. -- Fred --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-spinoffs?hl=en -~----------~----~----~----~------~----~------~--~---
The difference is semantic here. I''m not a language lawyer, nor do I care to be. On 11/9/06, Fred <ozfred-AFFH1GffN5hPR4JQBCEnsQ@public.gmane.org> wrote:> > > > Jay Miller wrote: > > In the line: > > x.mouseover = this.doHover.bindAsEventListener(this) > > this doesn''t refer to what you''re thinking. It''s inside the closure, > which > > changes the scope chain. > > The value of a function''s this keyword is not affected by, nor does it > have any effect on, the scope chain. Its value is determined *only* by > how the function is called. > > > -- > Fred > > > > >--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-spinoffs?hl=en -~----------~----~----~----~------~----~------~--~---