integers and arrays in Java - how? - Page 4

Robert Baer

I used Google and found some references for integer in Java.
But "int" not only does not work, it also prevents reading X and Y
coordinates of the mouse.
What i would like to do:
1) Get X and Y mouse coordinates into a variable that i can do real math on.
So far, i can do math on the values "read" and that result goes into
a "variable" that is useful *only* for display.
If i try "int" in that math, the values are then zero for everything
- even those where i do no calculation.
2) Use the calculated integer values as an index to a table or array.
It is acceptable to use an HTML "table" as the source for the lookup;
W(CalcFromX) and P(CalcFromX) would be the resulting values to be
displayed on the screen somewhere.

Can this be done, and eXactly how?

Mar 30 '06

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Robert Baer

VK wrote:

Robert Baer wrote:
Robert Baer wrote:

I used Google and found some references for integer in Java.
But "int" not only does not work, it also prevents reading X and Y
coordinate s of the mouse.

OK, you'll be helped if you promise _stop_ calling JavaScript as "Java"
or "Java Script". You don't say "Linux" while talking about Windows, do
you? And you don't say that your browser is called "Inter Net
Ex-Plorer", do you? ** I do not use ImpossiblyExasp erator; i *ripped* it out of my OS
kicking and screeming.

So: the language you are trying to use is called JavaScript - 10
characters without space. The variant of this language implemented in
Internet Explorer is called JScript - 7 characters without space.
Collectively it is reffered as "JavaScript/JScript programming". To
save time and space it is often said just "script": "my script doesn't
work" etc. - if it is clear by context what your are talking about
JavaScript/JScript programming. ** Well, that results in the question as to what "variant" will work
with the most browsers - and where i get programming inf concerning that
variant.
Yes, my script has problems - in fact, part of it that did work now
refuses to work, and i did not change it.

What i would like to do:
1) Get X and Y mouse coordinates into a variable that i can do real math
on.

You cannot do real math without using additional libraries and highly
resource expensive algorithms. In the normal circumstances you are
limited by machine math which may be identical, close or far away from
the real math - depending on values and operations. This is true for
JavaScript (10 chars no space - remember? ;-) as well as for Java, C,
C++, C# and any other language for PC (Personal Computer). See for
instance:-
<http://www.jibbering.c om/faq/#FAQ4_6> and
<http://www.jibbering.c om/faq/#FAQ4_7>

The code you posted is adjusted for NN4.x (1998-99) Empires raised and
falled since then :-)

Here is the HTML Strict compliant code for current generation of
browsers. Now if you tell what kind of math do you want to do with
mouse coords, one could suggest a proper way.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN"
"http://www.w3.org/TR/html401/strict.dtd">
<html>
<head>
<title>test 024</title>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<style type="text/css">
html {
margin: 0px 0px;
padding: 0px 0px}

body {
margin: 10px 10px;
padding: 0px 0px;
font: 1em Verdana, sans-serif;
color: #000000;
background-color: #FFFFFF}

form {
margin: 10px 10px;
padding: 5px 5px;
border: thin outset;
background-color: #EEEEEE}

form fieldset {
margin: 10px 10px;
padding: 10px 10px}

form fieldset legend {
margin: 0px 0px;
padding: 5px 5px;
cursor: default;
font-weight: bold}

form fieldset label {
float: left;
clear: left;
width: 20ex;
margin: 5px 0px;
padding: 0px 0px;
text-align: right}

form fieldset label:first-letter {
text-decoration: underline}

form fieldset input {
float: left;
width: 20ex;
margin: 5px 0px;
padding: auto auto;
font: 1em Verdana, sans-serif}

form fieldset button {
float: left;
margin: auto 5px;
padding: auto auto;
font: 1em Verdana, sans-serif}

form fieldset button:first-letter {
text-decoration: underline}
</style>

<script type="text/javascript">
function init() {
if ('undefined' == typeof mmX) {
mmX = document.forms['frm01'].elements['mmX'];
mmY = document.forms['frm01'].elements['mmY'];
}
W3 = ('undefined' != typeof document.body.a ddEventListener );
IE = ('undefined' != typeof document.body.a ttachEvent);
}

function start() {
if (W3) {
document.body.a ddEventListener ('mousemove',sh owCoords,true);
}
else if (IE) {
document.body.a ttachEvent('onm ousemove',showC oords);
}
else {
/*NOP*/
}
}

function stop() {
if (W3) {
document.body.r emoveEventListe ner('mousemove' ,showCoords,tru e);
}
else if (IE) {
document.body.d etachEvent('onm ousemove',showC oords);
}
else {
/*NOP*/
}
}

function showCoords(evt) {
var e = evt || event;
mmX.value = e.clientX;
mmY.value = e.clientY;
}

window.onload = init;
</script>

</head>

<body>

<form name="frm01" method="post" action=""
><fieldset><leg end>Mouse Coords</legend
><label for="mmX">X Coord:</label
><input type="text" name="mmX" id="mmX"

accesskey="x">< br
><label for="mmY">Y Coord:</label
><input type="text" name="mmY" id="mmY"

accesskey="y"></fieldset
><fieldset><leg end>Controls</legend
><button type="button" accesskey="w"

onClick="start( )">Watch</button
><button type="button" accesskey="u"

onClick="stop() ">Unwatch</button></fieldset
</form>

</body>
</html>

Apr 6 '06 #31

Robert Baer

Here is the code i have so far, with comments.
***
<html_would_sta rt_here_but_mod ified_for_sanit y>
<head>
<title>Test page</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet " type="text/css" href="style.css ">
</head>



<SCRIPT LANGUAGE="JavaS cript">

</SCRIPT>

<body>
<center>
<form name="dataholde r">
<table border=1>
<tr>
<td><i>Year(wid e)</i></td>
<td><input type="text" size=9 name="mmX" value="0"></td>
<td><i>Year(nar row)</i></td>
<td><input type="number" size=3.8 name="mmX" value="0"></td>
<td><i>Number of wells</i></td>
<td><input type="text" size=5 name="mmY1" value="0"></td>
<td><i>Producti on BBLs</i></td>
<td><input type="text" size=5 name="mmY2" value="0"></td>
<td><i>Z value</i></td>
<td><input type="text" size=9 name="mmZ" value="0"></td>
</tr>
</table>
</form>
</div>



<table align="center">
<tr>
<td align=center>
<center>
<div><i>&copy 2006 Oil 4 Less LLC</i></div>
</center>
</td>
</tr>
</table>


<div style="position : absolute; height: 316px; width: 697px; top: 100px;
left: 20px; "
<style="heigh t: 316px; width: 697px; top: 100px; left: 20px; " >
<img src="Arkansas.g if" alt="" usemap="#AK" style="border-style:none" >
</div>

</body>
</html>
***
Please note the problem with the first 2 display boxes ceasing to
work, and tell me what the he77 is going on.
Once i have a (calculated) year, i would like to "look-up" two
"values" (from a table of some sort): number of wells, and production.
Now those "values" may not be strictly numeric - there is the
possibility of entries like "123,456!" or "83,331#" or "3,551" (no
quotes) and i would want to display or show them "as-is".
Since JavaScript is supposed to be typeless, i would assume that is
not a problem.
The array or table will have about 65 years worth of data.

Apr 6 '06 #32

Robert Baer

Lee wrote:

Robert Baer said:

<td><input type="text" size=9 name="mmX" value="0"></td>
<td><i>Year(nar row)</i></td>
<td><input type="number" size=3.8 name="mmX" value="0"></td>
<td><i>Number of wells</i></td>

You've got two fields named "mmX". That's not going to work
the way you want. Give one of them a different name and
assign its value separately.

I will certainly try that; thanks.
However, that does not help explain why it used to work.
I wanted to show mmX in two places, and that is what *did* happen
until recently.
And that *certainly* does not explain why mmY does not work.

Apr 7 '06 #33

Robert Baer

Robert Baer wrote:

Here is the code i have so far, with comments.
***
<html_would_sta rt_here_but_mod ified_for_sanit y>
<head>
<title>Test page</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet " type="text/css" href="style.css ">
</head>



<SCRIPT LANGUAGE="JavaS cript">

</SCRIPT>

<body>
<center>
<form name="dataholde r">
<table border=1>
<tr>
<td><i>Year(wid e)</i></td>
<td><input type="text" size=9 name="mmX" value="0"></td>
<td><i>Year(nar row)</i></td>
<td><input type="number" size=3.8 name="mmX" value="0"></td>
<td><i>Number of wells</i></td>
<td><input type="text" size=5 name="mmY1" value="0"></td>
<td><i>Producti on BBLs</i></td>
<td><input type="text" size=5 name="mmY2" value="0"></td>
<td><i>Z value</i></td>
<td><input type="text" size=9 name="mmZ" value="0"></td>
</tr>
</table>
</form>
</div>



<table align="center">
<tr>
<td align=center>
<center>
<div><i>&copy 2006 Oil 4 Less LLC</i></div>
</center>
</td>
</tr>
</table>


<div style="position : absolute; height: 316px; width: 697px; top: 100px;
left: 20px; "
<style="heigh t: 316px; width: 697px; top: 100px; left: 20px; " >
<img src="Arkansas.g if" alt="" usemap="#AK" style="border-style:none" >
</div>

</body>
</html>
***
Please note the problem with the first 2 display boxes ceasing to
work, and tell me what the he77 is going on.
Once i have a (calculated) year, i would like to "look-up" two
"values" (from a table of some sort): number of wells, and production.
Now those "values" may not be strictly numeric - there is the
possibility of entries like "123,456!" or "83,331#" or "3,551" (no
quotes) and i would want to display or show them "as-is".
Since JavaScript is supposed to be typeless, i would assume that is
not a problem.
The array or table will have about 65 years worth of data.

Using Google to search for JavaScript, i found http://www.w3schools.com
which seems to give JavaScript help.
Looking in their JS Math, i found "Math Object Methods" with cryptic
numbers ?rating? FireFox, Netscape, and IE.
It appears that *none* of the "methods" work.

One would think that Google is giving bad information, and that site
does not cover JavaScript.

Apr 7 '06 #34

RobG

Robert Baer said on 07/04/2006 2:04 PM AEST:
[...]

Using Google to search for JavaScript, i found http://www.w3schools.com
which seems to give JavaScript help.
It offers tutorials on a variety of web technologies. Their stuff is OK
but don't treat it as authoritative. It has many eccentricities and is
plain wrong on some things. Use with caution.

Looking in their JS Math, i found "Math Object Methods" with cryptic
numbers ?rating? FireFox, Netscape, and IE.
The Math object is a native, built-in ECMAScript object. The numbers
for each browser provided by w3schools is the version that supported
that particular property/method.

It appears that *none* of the "methods" work.
As far as I know, they all work in modern browsers. Remember that they
are properties/methods of the Math object, so abs() is used thusly:

var x = -5;
alert( Math.abs(x) ); // shows '5'
Similarly for other methods.
One would think that Google is giving bad information, and that site
does not cover JavaScript.

Google is good. Some may agree with your opinion of w3schools, but they
might also be called cynics. ;-)
--
Rob
Group FAQ: <URL:http://www.jibbering.c om/FAQ>

Apr 7 '06 #35

Robert Baer

RobG wrote:

Robert Baer said on 07/04/2006 2:04 PM AEST:
[...]
Using Google to search for JavaScript, i found http://www.w3schools.com
which seems to give JavaScript help.

It offers tutorials on a variety of web technologies. Their stuff is OK
but don't treat it as authoritative. It has many eccentricities and is
plain wrong on some things. Use with caution.

Looking in their JS Math, i found "Math Object Methods" with cryptic
numbers ?rating? FireFox, Netscape, and IE.

The Math object is a native, built-in ECMAScript object. The numbers
for each browser provided by w3schools is the version that supported
that particular property/method.

It appears that *none* of the "methods" work.

As far as I know, they all work in modern browsers. Remember that they
are properties/methods of the Math object, so abs() is used thusly:

var x = -5;
alert( Math.abs(x) ); // shows '5'
Similarly for other methods.
One would think that Google is giving bad information, and that site
does not cover JavaScript.

Google is good. Some may agree with your opinion of w3schools, but they
might also be called cynics. ;-)

Does that mean one cannot do a simple-minded y = abs(x) ?

Apr 8 '06 #36

RobG

Robert Baer said on 08/04/2006 4:49 PM AEST:

RobG wrote:
Robert Baer said on 07/04/2006 2:04 PM AEST: [...]
It appears that *none* of the "methods" work.

As far as I know, they all work in modern browsers. Remember that
they are properties/methods of the Math object, so abs() is used thusly:

var x = -5;
alert( Math.abs(x) ); // shows '5'
Similarly for other methods. [...]

Does that mean one cannot do a simple-minded y = abs(x) ?

Yes. abs is a method of the Maths object. If you have lots of Math
functions to call, you could use 'with' but it's use is generally
frowned upon because it obfuscates code, e.g.:

with (Math){
alert(
abs(-5) + '\n' +
sqrt(5) + '\n' +
pow(3,4)
);
}

--
Rob
Group FAQ: <URL:http://www.jibbering.c om/FAQ>

Apr 9 '06 #37

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