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Walter Lee Davis

2008-Mar-06 16:41 UTC

passing the event with invoke?

I have a set of A tags that I would like to watch unobtrusively. I  
have given them all the same classname, and I want to use invoke to  
set them up, rather than each. Am I trying to do something that won''t  
work?

var blah = function(){
	//this function would do way more than this
	alert (this);
}

$$(''a.more'').invoke(''observe'',''click'',blah);

This works fine, but I want to stop the event, and none of these do  
the trick:

this.stop()
Event.stop(this)

or even extending the invoke with an additional argument after blah  
and using that as the event.

$$(''a.more'').invoke(''observe'',''click'',blah,''evt'');

The only way I have been able to hack it to actually do what I want  
is to set this.href to null. Which feels wrong in many ways.

What''s the right way to do this -- unobtrusively setting these links  
to not work, yet leaving them alone for those who don''t have JS  
enabled? Can I do this with invoke or do I need to get out and push  
with each?

Thanks in advance,

Walter

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Elden

2008-Mar-06 16:59 UTC

head link

Re: passing the event with invoke?

try this.

$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(this));

function blah(event){
       //this function would do way more than this
       event.stop();
       alert ("blah");
}

and for more information take a look on the api doc''s

http://www.prototypejs.org/api/function/bind

http://www.prototypejs.org/api/function/bindAsEventListener

On Thu, Mar 6, 2008 at 10:41 AM, Walter Lee Davis
<waltd-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:
>
> I have a set of A tags that I would like to watch unobtrusively. I
> have given them all the same classname, and I want to use invoke to
> set them up, rather than each. Am I trying to do something that
won''t
> work?
>
> var blah = function(){
>        //this function would do way more than this
>        alert (this);
> }
>
>
$$(''a.more'').invoke(''observe'',''click'',blah);
>
> This works fine, but I want to stop the event, and none of these do
> the trick:
>
> this.stop()
> Event.stop(this)
>
> or even extending the invoke with an additional argument after blah
> and using that as the event.
>
>
$$(''a.more'').invoke(''observe'',''click'',blah,''evt'');
>
> The only way I have been able to hack it to actually do what I want
> is to set this.href to null. Which feels wrong in many ways.
>
> What''s the right way to do this -- unobtrusively setting these
links
> to not work, yet leaving them alone for those who don''t have JS
> enabled? Can I do this with invoke or do I need to get out and push
> with each?
>
> Thanks in advance,
>
> Walter
>
> >
>

-- 
{a human being that was given to fly}

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Walter Lee Davis

2008-Mar-06 17:13 UTC

head link

Re: passing the event with invoke?

AH! I tried bindAsEventListener, but not in the correct spot. Thanks!!

Walter

On Mar 6, 2008, at 11:59 AM, Elden wrote:
>
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(this));

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Walter Lee Davis

2008-Mar-06 17:20 UTC

head link

Re: passing the event with invoke?

Just to wrap this up, here''s what worked:

	var details = function(evt){
		Event.stop(evt);
		var elm = Event.element(evt);
		alert(elm);
	}
	$$(''a.more'').invoke(''observe'',''click'',details.bindAsEventListener
(''evt''));

Thanks again for setting me on the right track.

Walter

On Mar 6, 2008, at 11:59 AM, Elden wrote:
> try this.
>
>
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(this));
>
> function blah(event){
>        //this function would do way more than this
>        event.stop();
>        alert ("blah");
> }
>
> and for more information take a look on the api doc''s
>
> http://www.prototypejs.org/api/function/bind
>
> http://www.prototypejs.org/api/function/bindAsEventListener
>
> On Thu, Mar 6, 2008 at 10:41 AM, Walter Lee Davis  
> <waltd-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>
> I have a set of A tags that I would like to watch unobtrusively. I
> have given them all the same classname, and I want to use invoke to
> set them up, rather than each. Am I trying to do something that
won''t
> work?
>
> var blah = function(){
>        //this function would do way more than this
>        alert (this);
> }
>
>
$$(''a.more'').invoke(''observe'',''click'',blah);
>
> This works fine, but I want to stop the event, and none of these do
> the trick:
>
> this.stop()
> Event.stop(this)
>
> or even extending the invoke with an additional argument after blah
> and using that as the event.
>
>
$$(''a.more'').invoke(''observe'',''click'',blah,''evt'');
>
> The only way I have been able to hack it to actually do what I want
> is to set this.href to null. Which feels wrong in many ways.
>
> What''s the right way to do this -- unobtrusively setting these
links
> to not work, yet leaving them alone for those who don''t have JS
> enabled? Can I do this with invoke or do I need to get out and push
> with each?
>
> Thanks in advance,
>
> Walter
>
>
>
>
>
> -- 
> {a human being that was given to fly}
> >

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T.J. Crowder

2008-Mar-07 11:26 UTC

head link

Re: passing the event with invoke?

Walter,

Am I missing something about bindAsEventListener when you pass it a
string for the thisObj parameter? Because it looks to me like you''re
binding your ''details'' function such that when the function is
called
in response to the event, the ''this'' keyword will refer to the
string
"evt".  It doesn''t matter in your example because your
''details''
function never uses ''this'' (instead it gets the element that
was
clicked using Event.element, which is reasonable), but I thought I''d
ask the question...
--
T.J. Crowder
tj / crowder software / com

On Mar 6, 5:20 pm, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:> Just to wrap this up, here''s what worked:
>
>         var details = function(evt){
>                 Event.stop(evt);
>                 var elm = Event.element(evt);
>                 alert(elm);
>         }
>        
$$(''a.more'').invoke(''observe'',''click'',details.bindAsEventListener
> (''evt''));
>
> Thanks again for setting me on the right track.
>
> Walter
>
> On Mar 6, 2008, at 11:59 AM, Elden wrote:
>
> > try this.
>
> >
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(this));
>
> > function blah(event){
> >        //this function would do way more than this
> >        event.stop();
> >        alert ("blah");
> > }
>
> > and for more information take a look on the api doc''s
>
> >http://www.prototypejs.org/api/function/bind
>
> >http://www.prototypejs.org/api/function/bindAsEventListener
>
> > On Thu, Mar 6, 2008 at 10:41 AM, Walter Lee Davis
> > <wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>
> > I have a set of A tags that I would like to watch unobtrusively. I
> > have given them all the same classname, and I want to use invoke to
> > set them up, rather than each. Am I trying to do something that
won''t
> > work?
>
> > var blah = function(){
> >        //this function would do way more than this
> >        alert (this);
> > }
>
> >
$$(''a.more'').invoke(''observe'',''click'',blah);
>
> > This works fine, but I want to stop the event, and none of these do
> > the trick:
>
> > this.stop()
> > Event.stop(this)
>
> > or even extending the invoke with an additional argument after blah
> > and using that as the event.
>
> >
$$(''a.more'').invoke(''observe'',''click'',blah,''evt'');
>
> > The only way I have been able to hack it to actually do what I want
> > is to set this.href to null. Which feels wrong in many ways.
>
> > What''s the right way to do this -- unobtrusively setting
these links
> > to not work, yet leaving them alone for those who don''t have
JS
> > enabled? Can I do this with invoke or do I need to get out and push
> > with each?
>
> > Thanks in advance,
>
> > Walter
>
> > --
> > {a human being that was given to fly}--~--~---------~--~----~------------~-------~--~----~
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Walter Lee Davis

2008-Mar-07 14:08 UTC

head link

Re: passing the event with invoke?

I tried using the keyword this in the bindAsEventListener and inside  
the details function, and that did not work.   What appeared to be  
bound was the anchor, not the event. And I was right back where I  
started with not being able to stop the click event before the link  
was followed.

Should this:

$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(this));

Have been this:

$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(''this''));

Because I can see that the former is passing an object while the  
latter is passing a string.

Walter

On Mar 7, 2008, at 6:26 AM, T.J. Crowder wrote:
>
> Walter,
>
> Am I missing something about bindAsEventListener when you pass it a
> string for the thisObj parameter? Because it looks to me like
you''re
> binding your ''details'' function such that when the
function is called
> in response to the event, the ''this'' keyword will refer
to the string
> "evt".  It doesn''t matter in your example because your
''details''
> function never uses ''this'' (instead it gets the element
that was
> clicked using Event.element, which is reasonable), but I thought
I''d
> ask the question...
> --
> T.J. Crowder
> tj / crowder software / com
>
> On Mar 6, 5:20 pm, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>> Just to wrap this up, here''s what worked:
>>
>>         var details = function(evt){
>>                 Event.stop(evt);
>>                 var elm = Event.element(evt);
>>                 alert(elm);
>>         }
>>         $$(''a.more'').invoke 
>>
(''observe'',''click'',details.bindAsEventListener
>> (''evt''));
>>
>> Thanks again for setting me on the right track.
>>
>> Walter
>>
>> On Mar 6, 2008, at 11:59 AM, Elden wrote:
>>
>>> try this.
>>
>>>
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener
>>> (this));
>>
>>> function blah(event){
>>>        //this function would do way more than this
>>>        event.stop();
>>>        alert ("blah");
>>> }
>>
>>> and for more information take a look on the api doc''s
>>
>>> http://www.prototypejs.org/api/function/bind
>>
>>> http://www.prototypejs.org/api/function/bindAsEventListener
>>
>>> On Thu, Mar 6, 2008 at 10:41 AM, Walter Lee Davis
>>> <wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>>
>>> I have a set of A tags that I would like to watch unobtrusively. I
>>> have given them all the same classname, and I want to use invoke to
>>> set them up, rather than each. Am I trying to do something that  
>>> won''t
>>> work?
>>
>>> var blah = function(){
>>>        //this function would do way more than this
>>>        alert (this);
>>> }
>>
>>>
$$(''a.more'').invoke(''observe'',''click'',blah);
>>
>>> This works fine, but I want to stop the event, and none of these do
>>> the trick:
>>
>>> this.stop()
>>> Event.stop(this)
>>
>>> or even extending the invoke with an additional argument after blah
>>> and using that as the event.
>>
>>>
$$(''a.more'').invoke(''observe'',''click'',blah,''evt'');
>>
>>> The only way I have been able to hack it to actually do what I want
>>> is to set this.href to null. Which feels wrong in many ways.
>>
>>> What''s the right way to do this -- unobtrusively setting
these links
>>> to not work, yet leaving them alone for those who don''t
have JS
>>> enabled? Can I do this with invoke or do I need to get out and push
>>> with each?
>>
>>> Thanks in advance,
>>
>>> Walter
>>
>>> --
>>> {a human being that was given to fly}
> >

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T.J. Crowder

2008-Mar-07 14:58 UTC

head link

Re: passing the event with invoke?

Unless you really want "this" to reference a string object within your
handler, you won''t want to pass strings into bindAsEventListener as
far as I can see.

The first parameter to bindAsEventListener is the object that you want
to access via "this" within the handler (http://www.prototypejs.org/
api/function/bind, http://www.prototypejs.org/api/function/bindAsEventListener).
When the handler is called in response to an event, the first argument
to it will be the event object for the event.  These are two separate
things.

So for example, if I have a method called "handleIt" on an object
instance assigned to a variable called "myThingy" and an element with
the ID "someDiv", this code:

$(''somediv'').observe(''click'',
myThingy.handleIt.bindAsEventListener(myThingy));

...means that when "someDiv" is clicked, the "handleIt"
method will be
called with "this" referencing "myThingy" and with the first
parameter
being the event object generated by the click.  You only care what
"this" is if you''re going to use it within the handler; if
you''re just
interested in the event or the element on which the event occurred,
you don''t need "this" at all, just use the first argument
(the event)
and the element that generated it [Event.element(eventObject)].

Hope this helps,
--
T.J. Crowder
tj / crowder software / com

On Mar 7, 2:08 pm, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:> I tried using the keyword this in the bindAsEventListener and inside
> the details function, and that did not work.   What appeared to be
> bound was the anchor, not the event. And I was right back where I
> started with not being able to stop the click event before the link
> was followed.
>
> Should this:
>
>
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(this));
>
> Have been this:
>
>
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener(''this''));
>
> Because I can see that the former is passing an object while the
> latter is passing a string.
>
> Walter
>
> On Mar 7, 2008, at 6:26 AM, T.J. Crowder wrote:
>
>
>
> > Walter,
>
> > Am I missing something about bindAsEventListener when you pass it a
> > string for the thisObj parameter? Because it looks to me like
you''re
> > binding your ''details'' function such that when the
function is called
> > in response to the event, the ''this'' keyword will
refer to the string
> > "evt".  It doesn''t matter in your example because
your ''details''
> > function never uses ''this'' (instead it gets the
element that was
> > clicked using Event.element, which is reasonable), but I thought
I''d
> > ask the question...
> > --
> > T.J. Crowder
> > tj / crowder software / com
>
> > On Mar 6, 5:20 pm, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
> >> Just to wrap this up, here''s what worked:
>
> >>         var details = function(evt){
> >>                 Event.stop(evt);
> >>                 var elm = Event.element(evt);
> >>                 alert(elm);
> >>         }
> >>         $$(''a.more'').invoke
> >>
(''observe'',''click'',details.bindAsEventListener
> >> (''evt''));
>
> >> Thanks again for setting me on the right track.
>
> >> Walter
>
> >> On Mar 6, 2008, at 11:59 AM, Elden wrote:
>
> >>> try this.
>
> >>>
$$(''a.more'').invoke("observe","click",blah.bindAsEventListener
> >>> (this));
>
> >>> function blah(event){
> >>>        //this function would do way more than this
> >>>        event.stop();
> >>>        alert ("blah");
> >>> }
>
> >>> and for more information take a look on the api doc''s
>
> >>>http://www.prototypejs.org/api/function/bind
>
> >>>http://www.prototypejs.org/api/function/bindAsEventListener
>
> >>> On Thu, Mar 6, 2008 at 10:41 AM, Walter Lee Davis
> >>> <wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>
> >>> I have a set of A tags that I would like to watch
unobtrusively. I
> >>> have given them all the same classname, and I want to use
invoke to
> >>> set them up, rather than each. Am I trying to do something
that
> >>> won''t
> >>> work?
>
> >>> var blah = function(){
> >>>        //this function would do way more than this
> >>>        alert (this);
> >>> }
>
> >>>
$$(''a.more'').invoke(''observe'',''click'',blah);
>
> >>> This works fine, but I want to stop the event, and none of
these do
> >>> the trick:
>
> >>> this.stop()
> >>> Event.stop(this)
>
> >>> or even extending the invoke with an additional argument after
blah
> >>> and using that as the event.
>
> >>>
$$(''a.more'').invoke(''observe'',''click'',blah,''evt'');
>
> >>> The only way I have been able to hack it to actually do what I
want
> >>> is to set this.href to null. Which feels wrong in many ways.
>
> >>> What''s the right way to do this -- unobtrusively
setting these links
> >>> to not work, yet leaving them alone for those who
don''t have JS
> >>> enabled? Can I do this with invoke or do I need to get out and
push
> >>> with each?
>
> >>> Thanks in advance,
>
> >>> Walter
>
> >>> --
> >>> {a human being that was given to fly}--~--~---------~--~----~------------~-------~--~----~
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Walter Lee Davis

2008-Mar-07 15:08 UTC

head link

Re: passing the event with invoke?

Okay, I get that so far, but what is the name of the event that is  
automatically passed as the first parameter? One of the other posters  
suggested I use event.stop(), but that just got me an error as event  
was not defined.

Walter

On Mar 7, 2008, at 9:58 AM, T.J. Crowder wrote:
>
> Unless you really want "this" to reference a string object within
your
> handler, you won''t want to pass strings into bindAsEventListener
as
> far as I can see.
>
> The first parameter to bindAsEventListener is the object that you want
> to access via "this" within the handler
(http://www.prototypejs.org/
> api/function/bind, http://www.prototypejs.org/api/function/ 
> bindAsEventListener).
> When the handler is called in response to an event, the first argument
> to it will be the event object for the event.  These are two separate
> things.
>
>
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knox

2008-Mar-07 17:32 UTC

head link

Re: passing the event with invoke?

Walter,
The poster who directed you to using event vs this is correct.  I
didn''t look at the syntax specifically provided, but here is an
excerpt from a real world example that I wrote:

This is inside of a custom object, so some of the syntax might be
slightly different than what you would need.
    setupLink:function() {
        var myLink = new
Element(''A'').setStyle({''cursor'':''pointer''}).update(''remove'');
        myLink.observe(''click'', this.removeRow);
    },
    removeRow:function(e) {
        e.element().up(''TR'').remove();
        e.stop();
    }

The important part here is that when you''re using Event.observe, it
passes the actual event as the first argument to the callback
function.  The ''this'' keyword probably isn''t a
concern in your case,
so you shouldn''t need to use bind or bindAsEventListener.  You should
instead be using whatever name you gave to the event in the definition
of your function.  In my case, ''e''.  If you do not use bind or
bindAs..., this will refer to the A(nchor) element that was clicked.
Only use bind or bindAs... if you need to change what ''this''
refers
to.  A great tool for figuring out what this refers to is firebug in
firefox 2.

As I mentioned, my example is within a custom object, but my callback
function isn''t using ''this'' to modify my object, so I
have no need to
use bindAsEventListener.  If I wanted ''this'' to refer to my
custom
object, then my observe call would have looked like this:

        myLink.observe(''click'',
this.removeRow.bindAsEventListener(this));

Hope that helps,
Knox

On Mar 7, 8:08 am, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:> Okay, I get that so far, but what is the name of the event that is
> automatically passed as the first parameter? One of the other posters
> suggested I use event.stop(), but that just got me an error as event
> was not defined.
>
> Walter
>
> On Mar 7, 2008, at 9:58 AM, T.J. Crowder wrote:
>
>
>
> > Unless you really want "this" to reference a string object
within your
> > handler, you won''t want to pass strings into
bindAsEventListener as
> > far as I can see.
>
> > The first parameter to bindAsEventListener is the object that you want
> > to access via "this" within the handler
(http://www.prototypejs.org/
> > api/function/bind,http://www.prototypejs.org/api/function/
> > bindAsEventListener).
> > When the handler is called in response to an event, the first argument
> > to it will be the event object for the event.  These are two separate
> > things.--~--~---------~--~----~------------~-------~--~----~
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T.J. Crowder

2008-Mar-07 18:10 UTC

head link

Re: passing the event with invoke?

> Okay, I get that so far, but what is the name of the event that is
> automatically passed as the first parameter?
It''s totally up to you -- you''re the one defining the function
that''s
getting called, you define the names of its parameters. You can call
it flapjack if you like. :) In his first reply to you, Elden called it
"event" -- here''s the code he posted, with
===>markers<=== in both of
the relevant places:

function blah(===>event<===){
       //this function would do way more than this
       ===>event<===.stop();
       alert ("blah");
}

Since he called it "event" in the function signature, that''s
the name
he used in the code; but this would also work:

function blah(flapjack){
       //this function would do way more than this
       flapjack.stop();
       alert ("blah");
}

Hope this helps,
--
T.J. Crowder
tj / crowder software / com

On Mar 7, 3:08 pm, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:> Okay, I get that so far, but what is the name of the event that is
> automatically passed as the first parameter? One of the other posters
> suggested I use event.stop(), but that just got me an error as event
> was not defined.
>
> Walter
>
> On Mar 7, 2008, at 9:58 AM, T.J. Crowder wrote:
>
>
>
> > Unless you really want "this" to reference a string object
within your
> > handler, you won''t want to pass strings into
bindAsEventListener as
> > far as I can see.
>
> > The first parameter to bindAsEventListener is the object that you want
> > to access via "this" within the handler
(http://www.prototypejs.org/
> > api/function/bind,http://www.prototypejs.org/api/function/
> > bindAsEventListener).
> > When the handler is called in response to an event, the first argument
> > to it will be the event object for the event.  These are two separate
> > things.--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
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Walter Lee Davis

2008-Mar-07 18:54 UTC

head link

Re: passing the event with invoke?

Thanks again for your patient explanations. I missed the fact that he  
defined it in the function.

Walter

On Mar 7, 2008, at 1:10 PM, T.J. Crowder wrote:
>
>> Okay, I get that so far, but what is the name of the event that is
>> automatically passed as the first parameter?
>
> It''s totally up to you -- you''re the one defining the
function that''s
> getting called, you define the names of its parameters. You can call
> it flapjack if you like. :) In his first reply to you, Elden called it
> "event" -- here''s the code he posted, with
===>markers<=== in both of
> the relevant places:
>
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
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Rails spinoffs - Mar 2008 - passing the event with invoke?

passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?

Re: passing the event with invoke?