Why is this considered a float?

[laredotornado]

Hi,

I have a text field with the value "29..99" (notice the two dots
instead of one) and it is considered a float according to the
following logic. How would I rewrite the isFloat function so that the
above number fails validation?

if (!(isFloat(price) && parseFloat(price) 0)) {
alert("Price field cannot be empty or zero!");
return;
}

function isFloat(s)
{
if (isInteger(s)) {
return true;
} // if
var n = trim(s);
return n.length>0 && !(/[^0-9.]/).test(n) && (/\.
\d/).test(n);
} // isFloat

function isInteger(s)
{
var n = trim(s);
return n.length 0 && !(/[^0-9]/).test(n);
}

Thanks, - Dave

[Evertjan.]

la***********@zipmail.com wrote on 03 dec 2007 in comp.lang.javascript:

Hi,

I have a text field with the value "29..99" (notice the two dots
instead of one) and it is considered a float according to the
following logic. How would I rewrite the isFloat function so that the
above number fails validation?

if (!(isFloat(price) && parseFloat(price) 0)) {
alert("Price field cannot be empty or zero!");
return;
}

How do you define a float? Any noninteger number?

function isFloat(s)
{
if (isInteger(s)) {
return true;
} // if
var n = trim(s);
return n.length>0 && !(/[^0-9.]/).test(n) && (/\.
\d/).test(n);
} // isFloat

function isInteger(s)
{
var n = trim(s);
return n.length 0 && !(/[^0-9]/).test(n);
}

Just:

if ( isNaN(price) || !price )
alert("Price field cannot be zero or nonnumeric!");

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

[John W. Kennedy]

la***********@zipmail.com wrote:

I have a text field with the value "29..99" (notice the two dots
instead of one) and it is considered a float according to the
following logic.

....

return n.length>0 && !(/[^0-9.]/).test(n) && (/\.\d/).test(n);

!(/[^0-9.]/).test(n) tests "Is there no character other than 0-9 and .?"
"29..99" passes this; all the characters are either 0-9 or a period.

(/\.\d/).test(n) tests "Is there a period followed by a digit?"
"29..99" passes this; there is a period followed by a dot.

--
John W. Kennedy
"The pathetic hope that the White House will turn a Caligula into a
Marcus Aurelius is as naïve as the fear that ultimate power inevitably
corrupts."
-- James D. Barber (1930-2004)

[John W. Kennedy]

la***********@zipmail.com wrote:

I have a text field with the value "29..99" (notice the two dots
instead of one) and it is considered a float according to the
following logic.

....

return n.length>0 && !(/[^0-9.]/).test(n) && (/\.\d/).test(n);

!(/[^0-9.]/).test(n) tests "Is there no character other than 0-9 and .?"
"29..99" passes this; all the characters are either 0-9 or a period.

(/\.\d/).test(n) tests "Is there a period followed by a digit?"
"29..99" passes this; there is a period followed by a digit.

--
John W. Kennedy
"The pathetic hope that the White House will turn a Caligula into a
Marcus Aurelius is as naïve as the fear that ultimate power inevitably
corrupts."
-- James D. Barber (1930-2004)

[RobG]

On Dec 4, 8:33 am, "[e-mail]"
<[e-mail]:

Hi,

I have a text field with the value "29..99" (notice the two dots
instead of one) and it is considered a float according to the
following logic. How would I rewrite the isFloat function so that the
above number fails validation?

if (!(isFloat(price) && parseFloat(price) 0)) {
alert("Price field cannot be empty or zero!");
return;
}

function isFloat(s)
{
if (isInteger(s)) {
return true;
} // if
var n = trim(s);
return n.length>0 && !(/[^0-9.]/).test(n) && (/\.
\d/).test(n);
} // isFloat

function isInteger(s)
{
var n = trim(s);
return n.length 0 && !(/[^0-9]/).test(n);
}

Thanks, - Dave

If you want to validate that the user has entered something resembling
money in a particular format using a regular expression, then try:

<URL: http://www.merlyn.demon.co.uk/js-valid.htm >

A very simple RegExp test along lines of what you seem to want is:

function isMoneyFormat(s) {
return /^\d+\.\d\d$/.test(s)
}

Which returns true for a string like 0.00 or 1.23 or 1231.23 and so
on.
--
Rob

[Dr J R Stockton]

In comp.lang.javascript message <164a6bf5-383c-4c10-b02a-300aba0dda11@s1
9g2000prg.googlegroups.com>, Mon, 3 Dec 2007 14:33:31,
"la***********@zipmail.com" <la***********@zipmail.composted:

>I have a text field with the value "29..99" (notice the two dots
instead of one) and it is considered a float according to the
following logic. How would I rewrite the isFloat function so that the
above number fails validation?

if (!(isFloat(price) && parseFloat(price) 0)) {
alert("Price field cannot be empty or zero!");
return;
}

function isPrice(s) { return (/^\s*\d+(\.\d\d)?\s*/$).test(s) && s>0 }
// Negative and exponent not allowed; well-formed by IUPAP/SUNAMCO
// integer euros or cents, as euros

function isFloat(s)
{
if (isInteger(s)) {
return true;
} // if
var n = trim(s);
return n.length>0 && !(/[^0-9.]/).test(n) && (/\.
\d/).test(n);
} // isFloat

function isFloat(s) { return (/^\s*\d+(\.\d+)?\s*$/).test(s) }
// Negative and exponent not allowed; well-formed by IUPAP/SUNAMCO
// allows integer

function isInteger(s)
{
var n = trim(s);
return n.length 0 && !(/[^0-9]/).test(n);
}

function isInteger(s) { return (/^\s*\d+\s*$/).test(s) }
UNDERTESTED. Remember that all ECMA 3 Numbers are IEEE doubles, which
are floats.

<URL:http://www.merlyn.demon.co.uk/js-valid.htm>.

It's a good idea to read the newsgroup c.l.j and its FAQ. See below.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6
news:comp.lang.javascript FAQ <URL:http://www.jibbering.com/faq/index.html>.
<URL:http://www.merlyn.demon.co.uk/js-index.htmjscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/TP/BP/Delphi/jscr/&c, FAQ items, links.