Why am I getting Javascript (form) or (this.form) errors?

In an existing, tested and working program, I have a form entry that
simplifies to...

<INPUT name ="fp1s" type="text" value=0.000 size=12 >

and a button of...

<input type="button" value=" Set Amplitude "
onclick="setAmplitude (this.form)">

One of the things the setAmplitude function does is calculate a p1s
value and then does a...

form.fp1s.value = p1s ;

This seems to work fine. I wanted to add a new feature to the program
by adding a new button of

<input type="button" value="Improve?" onclick="imProveX
(this.form)">

An initial function for imProveX was...

function imProveX (form) { setAmplitude (this.form) ;
} ;

This should be doing the same thing the other button does, except from
within a new proc instead of a button click. Instaad, an error of ...

'fp1s' is null or not an object

gets returned.

What am I doing wrong?

The full code appears as http://www.tinaja.com/demo28q.asp


--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email:

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

Depends on what version of java you have, and what you are developing
scripts under, and their co-compatibilities.

 

JavaScript 1.1 being developed with Adobe GoLive 5.0.



--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email:

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

here this refers to the imProveX function and there is no form
property for function. pass the argument to setAmplitude function and
all should be fine.

function imProveX (form) { setAmplitude (form) ;

??????????????

 

Try:

function imProveX (form) { setAmplitude (form) ; }

 

Could also relate to the runtime engine you are trying to run it
under.

 

One of you two has no idea what he is talking about.
"JavaScript:
The World's Most Misunderstood Programming Language"
by Douglas Crockford
http://66.102.9.104/search?q=cache:...*-*-were-*-buggy+*-*-*-*-*-*-buggy-*-browsers

 

Don Lancaster a écrit :

function imProveX(form) { setAmplitude( form ); }
this.form is already here ------^
and was called in button

To avoid mistakes try to do not use variables named as elements

function imProveX ( something ) { setAmplitude( something ); }
or
function imProveX ( aForm ) { setAmplitude( aForm ); }

it would have to be : 'form.p1s' is null or not an object

 

MassiveProng said the following on 3/24/2007 12:05 PM:
The this above refers to the function and as such has no property named
"form". If you want to pass it, simply pass the parameter form.

Has nothing to do with any of that.

 

MassiveProng said the following on 3/24/2007 12:34 PM:

No, it relates to scope issues of variables and has nothing to do with
any "runtime engine"

 

I see MicroBrain is metastasizing. =:-O

Cheers!
Rich

 

We had problems at work after upgrading to a new version. Just
thought I'd mention it. No big deal.

 

You're an idiot, GriseTard. What now... a stalking idiot as well?

 

There is a JavaScript NG and the posters there are *extremely* helpful.

 

No, it references the global object.

The only way imProveX's this keyword can refer to the imProveX
function is if the calling function had set it that way using call or
apply methods, and it doesn't. imProvex is called as a method of
window, effectively as window.imProvex(). Therefore its this keyword
references the window (global) object.

for the global object (unless one has been created elsewhere).

That should do it.

 

Thanks for the info.

btw, randy said the same thing

Yup.. if you add the missing brace.

 

Inside this function, 'this.form' is undefined. I think you need to pass
'form' to setAmplitude.

Because its null (not defined in the calling function imProveX.

 

Many thanks to everyone. Using (form) rather than (this.form) did it.

Presently exploring how to get this code to converge faster.
Preferably instantly.
Any suggestions?

Latest working version is http://www.tinaja.com/demo28a.asp


--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email:

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

"Classic Wrong" doesn't know the difference between "Java"" and
"Javascript".


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

Rich Grise said the following on 3/24/2007 5:25 PM:

I see c.l.j isn't the only group with an idiot. Are you related to VK by
chance? Genetics might explain it.