Problem with JScript in Internet Explorer

[netsurfer]

Hi:

I'm having an issue with a website design that I'm working on a web
page...and I'm coming up
with an Error after opening the web site Internet Explorer browser that
says:

Error

A Runtime Error has occurred. Do you wish to Debug?

Line: 413
Error: 'MSFPhover' is undefined

When I run the debugger it points to this line of code:

if(MSFPhover) { MSFPnav2n=MSFPpreload("_derived/dock pick up.gif");
MSFPnav2h=MSFPpreload("_derived/dock pick up_a.gif"); }

I'm not really sure how MSFPhover would be defined. Would really
appreciate any feedback on how this can go about being
done.

Thanks in advanced for any response.

 

[Mick White]

Hi:

I'm having an issue with a website design that I'm working on a web
page...and I'm coming up
with an Error after opening the web site Internet Explorer browser that
says:

Error

A Runtime Error has occurred. Do you wish to Debug?

Line: 413
Error: 'MSFPhover' is undefined

Look for the following abomination:

MSFPhover =
(((navigator.appName == "Netscape") &&
(parseInt(navigator.appVersion) >= 3 )) ||
((navigator.appName == "Microsoft Internet Explorer") &&
(parseInt(navigator.appVersion) >= 4 )));

Change it to, or add:

MSFPhover = document.images?true:false;

Mick

 

[Evertjan.]

Mick White wrote on 23 apr 2005 in comp.lang.javascript:

Look for the following abomination:

MSFPhover =
(((navigator.appName == "Netscape") &&
(parseInt(navigator.appVersion) >= 3 )) ||
((navigator.appName == "Microsoft Internet Explorer") &&
(parseInt(navigator.appVersion) >= 4 )));

Change it to, or add:

MSFPhover = document.images?true:false;

And change that to:

MSFPhover = !!document.images

;-}

 

[Mick White]

Mick White wrote
And change that to:

MSFPhover = !!document.images

;-}

Yes, but I didn't want to give out cryptic advice...
Mick

 

[Richard Cornford]

Yes, but I didn't want to give out cryptic advice...

Cryptic to who? Shouldn't javascript programmers be expected to
understand the language's operators, and the implied type-conversions in
the above statement?

But if you want to write that statement in a way that is theoretically
unambiguous:-

MSFPhover = Boolean(document.images);

- should be sufficiently self-documenting. Though the reader is still
expected to understand the actions of the Boolean constructor when
called as a function.

Though, given the reported error, the OP's problem looks more related to
a failure to declare the variable in the global namespace. But the
information provided is inadequate for a meaningful analyses.

Richard.

 

[Mick White]

Yes, but I didn't want to give out cryptic advice...

[...]

But if you want to write that statement in a way that is theoretically
unambiguous:-

MSFPhover = Boolean(document.images);

- should be sufficiently self-documenting. Though the reader is still
expected to understand the actions of the Boolean constructor when
called as a function.

I doubt,in this case, that the OP would recognize "MSFPhover =
!!document.images" as being implied type casting (to Boolean), I simply
offered a more "readable" solution. I do like the Boolean constructor,
though; it's certainly less cryptic.
Mick

 

[Evertjan.]

Mick White wrote on 24 apr 2005 in comp.lang.javascript:

Yes, but I didn't want to give out cryptic advice...
Mick

true ..... false .... ;-)

 

[Mick White]

Mick White wrote on 24 apr 2005 in comp.lang.javascript:




true ..... false .... ;-)
!false
Mick