Rails spinoffs - Jan 2008 - specifying function arguments when using Event.observe

Hi,

I''m using prototype for a while now, but from the start I''ve
been
struggling with this. I obviously lack javascript knowledge. I hope
someone can show me the light... Here it comes.

I have a javascript function that creates and returns a button
element. The function has one argument, being a pointer to the
javascript function to call when the user clicks on the button. For
now it looks like this:

function getOkButton(clientOnClickFunction)
{
    // create the image button
    var button = new Element(''button'', {
className:''buttonBig'' });
    button.appendChild(new Element(''img'', {
src:getApplicationPath() +
''img/ok.png''}));

    // attach the click event handler
    if (clientOnClickFunction != null)
        Event.observe(button, ''click'', clientOnClickFunction);

    return button;
}

Let''s say I have a page where I need an ''ok'' button.
Then I do
something like:
someElement.appendChild(getOkButton(clickHandler1));

function clickHandler1(event)
{
    alert(''you clicked the first ok button'');
}

The thing I''m not able to figure out is how I can have that
clickHandler1 have more then only the event as an argument.
Now I''m _solving_ it like this (horrible):
clickHandler1.someInfoNeededInTheClickHandler = ''GO'';
someElement.appendChild(getOkButton(clickHandler1));

and the clickHandler1 looks like:
function clickHandler1(event)
{
    alert(''you clicked the first ok button... info = '' +
clickHandler1.someInfoNeededInTheClickHandler);
}

This is ugly. And will give issues if I have 2 ''ok'' buttons on
1 page
which both should call clickHandler1, but with a different
''someInfoNeededInTheClickHandler''.

So basically my clickHandler1 should look like:
function clickHandler1(event, arg1, arg2, arg3)
{
    // do something with arg1, arg2 and arg3
}

How can I solve this in a nice way?
Thanks in advance!

Manu aka TweeZz.
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Hey,

It was discussed *yesterday*, man.  Check the archives :-)

What you''re looking for here, since you''re interested in
keeping the
event argument first, is bindAsEventListener:

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

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Thanks a lot! I tried look in the archives, but I didn''t find the
correct search string probably...
Really thanks a lot...

On Jan 17, 2:22 pm, Christophe Porteneuve
<t...-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org>
wrote:
> Hey,
>
> It was discussed *yesterday*, man.  Check the archives :-)
>
> What you''re looking for here, since you''re interested in
keeping the
> event argument first, is bindAsEventListener:
>
>        http://prototypejs.org/api/function/bindAsEventListener
>
> --
> Christophe Porteneuve aka TDD
> t...-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org
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