functions without arguments

[George Hester]

In my neck of the woods functions usually have arguments. For example f(r) = 3 + r is a nice function. f(5) = 8, f(-3) = 0. In JavaScript we could write it like this:

function f(r){
return (r + 3);
}

easy enough.

Now say we have a <INPUT element that has the onmouseover event defined like this:

<INPUT name="test"... onmouseover="Ja vaScript:alert( f(3));".../>

When the mouse goes over this elemnt you will get a message box that contains the value 6.

But what if we would like to remove the attribute and assign the onmouseover this way:

<INPUT name="test".../>

<script type="javascrip t">
<!-- Begin
document.getEle mentById('test' ).onmouseover = f
function f(r){
return (r+3);
}
// End -->
</script>

This won't work. I understand why it doesn't but I don't understand if assigning event handlers in this fashion REQUIRES argumentless functions. Is that right? Thanks.

--
George Hester
_______________ _______________ ____

[to heave chunks]

Re: functions without arguments

><.script type="javascrip t">[color=blue]
><!-- Begin
>document.getEl ementById('test ').onmouseover = f
>function f(r){
> return (r+3);
>}
>// End -->
><./script>
>
>This won't work. I understand why it doesn't but I don't understand if =
>assigning event handlers in this fashion REQUIRES argumentless =
>functions. Is that right? Thanks.[/color]

I don't you think you understand this as well as you may think. When you add
an event handler attribute to a HTML tag, the scripting engine attaches an
anonymous function to the event handler.

For instance,

<.div onmouseover="al ert( 3);">

The function that is attached to the onmouseover event handler looks like this.

function Anonymous() {
alert( 3);
}

You do not attach "alert( 3);" to the onmousover event, you attach an Anonymous
function which contains "alert( 3);".

A more accurate representation of what you are trying to accomplish would be
this.

function Test_MO_Functio n() {
alert( f( 3));
}

function f( r) {
return (r+3);
}

document.getEle mentById( "elmTest").onmo useover = Test_MO_Functio n;


Peace, Vm
Yaz

Providing complicated solutions to simple problems since 1997.

[George Hester]

Re: functions without arguments

_______________ _______________ ____
"to heave chunks" <justyaz@aol.co mpels.me> wrote in message news:2004012600 0820.18858.0000 0746@mb-m28.aol.com...
[color=blue]
> I don't you think you understand this as well as you may think. When you add
> an event handler attribute to a HTML tag, the scripting engine attaches an
> anonymous function to the event handler.
> [/color]
[color=blue]
> Peace, Vm
> Yaz
> [/color]
Sure that's why I asked. I am not too ashamed to be dumb. It happens. I understand a function I just didn't understand JavaScript's use of it. Thanks Vm I think I can use your hint.