A couple language questions

#1

1) I want to test for the existence of a method o.m(), so I tried the line
if (o.m) ...
but the interpreter objects to the missing parentheses on m. (This is in
IE.) What is an appropriate approach for checking the existing of a
function?

2) I've got the following code
window.onresize = function {
....
f();
}
function f() {
....
}
<BODY onload="f();">

My question: if the resize event happens while f is executing, is the first
call to f (onload) flushed from the stack? If not, where in f is execution
resumed after the second call to f takes place in response to the resize
event?

Thanks.

Ken

#2

"Ken Kast" <knk (AT) kenkast (DOT) com> wrote

Quote:

1) I want to test for the existence of a method o.m(), so I tried the line
if (o.m) ...
but the interpreter objects to the missing parentheses on m. (This is in
IE.) What is an appropriate approach for checking the existing of a
function?

if (typeof o == 'object' && typeof o.m == 'function') {
// Function exists
}

Quote:

2) I've got the following code
window.onresize = function {
...
f();
}
function f() {
...
}
BODY onload="f();"

window.onresize = f; // this is sufficient

Quote:

My question: if the resize event happens while f is executing, is the
first
call to f (onload) flushed from the stack? If not, where in f is
execution
resumed after the second call to f takes place in response to the resize
event?

My guess is that the function will be called twice after the calls have been
queued.

JW

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A couple language questions

Javascript JavaScript language (comp.lang.javascript)

A couple language questions - 07-03-2003 , 11:12 AM

Re: A couple language questions - 07-03-2003 , 12:08 PM