RE: a quick js code question
- From: "Adrian Beech" <a.beech@xxxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Thu, 7 Feb 2008 23:46:03 +1000
G'day,
Change the name of the "in" field to something else, i.e. "inVal". I also
assume your form is named "form"? I'd change this too to something else as
well.
Cheers.
AB
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Hall
Sent: Thursday, 7 February 2008 10:42 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: a quick js code question
I have tried alerting x but nothing happens, and I mean nothing;
no alert, no error alert, there is just a small pause as though
my bn were running the function but then nada.
Have a great day,
Alex
> ----- Original Message -----
>From: "Jeffrey Fidler" <jfiddler2@xxxxxxxxxxx
>To: <programmingblind@xxxxxxxxxxxxx
>Date sent: Wed, 6 Feb 2008 23:01:59 -0500
>Subject: Re: a quick js code question
>Alex,
>When you are initializing x, you are first getting a string type
back from
>the form.ihn.value property, and then you are passing it to
eval(), which
>then will evaluate the string as if it is an expression. (This
is one of
>the things I find troubling about loosely typed languages! You
have to
>manage all of the data typing in your head instead of knowing it
explicitly
>by glancing at the code.) That is why you will get '13' out of
the value
>property and 4 out of eval(). In any case, one of the oldest
debugging
>techniques in the javascript world is to insert an alert()
function call her
>and there to see what you are getting out of your assignments.
If you find
>that alert(x); returns 'undefined' or something strange like
that, you will
>have a place to begin working toward a solution to your problem.
>Good luck!
>- Jeff
>----- Original Message -----
>From: "Alex Hall" <mehgcap@xxxxxxx
>To: <programmingblind@xxxxxxxxxxxxx
>Sent: Wednesday, February 06, 2008 10:49 PM
>Subject: Re: a quick js code question
>> Yes, I tried it both ways. I have found, though, that not using
eval()
>> causes 1+3 to equal 13, while using eval() gives me 4, which is
the type
>> of answer I am looking for.
>> Have a great day,
>> Alex
>>> ----- Original Message -----
>>>From: "Jeffrey Fidler" <jfiddler2@xxxxxxxxxxx
>>>To: <programmingblind@xxxxxxxxxxxxx
>>>Date sent: Wed, 6 Feb 2008 22:32:08 -0500
>>>Subject: Re: a quick js code question
>>>Alex,
>>>eval() will evaluate a string argument. Did you try to just use
>> the
>>>assignment operator to initialize your variable? i.e. var x =
>>>form.in.value;
>>>HTH!
>>>- Jeff
>>>----- Original Message -----
>>>From: "Alex Hall" <mehgcap@xxxxxxx
>>>To: <programmingblind@xxxxxxxxxxxxx
>>>Sent: Wednesday, February 06, 2008 10:08 PM
>>>Subject: a quick js code question
>>>> Hi all,
>>>> I have a very simple program that, for some reason refuses to
>> run. I have
>>>> this function being called by a button and that part works, but
>> I cannot
>>>> get an answer out of this function. It seems to stop at where I
>> declare x
>>>> as a variable. The code, all 12 lines of it, is below. If
>> anyone can
>>>> point out what I know must be a very simple error I would really
>>>> appreciate it.
>>>> function eq(){
>>>> try{
>>>> x=eval(form.in.value);
>>>> ans=(x-2)/(x*x)-4;
>>>> form.out.value=ans;
>>>> catch(err){
>>>> alert(err+": "+err.description);
>>>> Have a great day,
>>>> Alex
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