JRS: In article <418e729f$1@news.012.net.il>, dated Sun, 7 Nov 2004
21:08:24, seen in news:comp.lang.javascript, J. J. Cale
<photom@netvision.net.il> posted :[color=blue]
>
>"Yann-Erwan Perio" <y-e.perio@em-lyon.com> wrote in message
>news:418dfe36$0$19893$626a14ce@news.free.fr...[color=green]
>> J. J. Cale wrote:
>>[color=darkred]
>> > The
>> > user can also input directly to the text inputs and I would like to[/color][/color]
>route[color=green][color=darkred]
>> > whatever the user inputs through a filter using regexes wherever[/color][/color]
>possible.[color=green]
>>
>> See if the following can help you into building your script (slightly
>> tested only). Note that proposing two ways to input data could confuse
>> the user (not mentioning different date formats across the world);[/color]
>
>client wants a mouse option and suggested pick lists
>[color=green]
>> moreover you'll still have to validate the input server-side.[/color]
>
>the cgi will parse any valid date string. Valid being of one of the formats
>d/m/yyyy d/mm/yyyy dd/m/yyyy dd/mm/yyyy
>where d>0&&d<32 m>0&&m<13 y>1929&&y<2009[/color]
It's not obvious what application can require such a date range, apart
from one connected with employment, in which case starting with 1930
seems still risky - how old is Mr Sharon these days? Many of us will
have living relatives born before 1930.
ISTM likely that the client will need to update the page before 2009;
you could instead allow a dynamic date range, from the current year (or
day) back almost 100 years.
[color=blue]
> I am still hoping to do this with minimum code and avoid using a date
> object at all costs.[/color]
Those are incompatible aims, at least if you would like to validate the
dates properly. A Date Object is very effective at date validation,
although one can do it much faster by well-considered other means.
[color=blue]
>An hour ago I had no idea how to use a regular expression.
>Here is what I have after an hour of scanning Dr Stocktons examples, and is[/color]
A few more hours should do it, then.
[color=blue]
>more what I hoped to achieve and more than I dreamed I'd be able to do. And
>I'll bet you or others can sophisticate my basic idea down to 10 lines or
>less. I'll be happy until someone points out all the holes there probably
>are.[/color]
[color=blue]
>function checkChar() {
>// only accept numbers and the backslash
>// I know! IE specific :>[
> var char = String.fromCharCode(event.keyCode);
> if(!/\d|\//.test(char)) {
> alert("enter a number from 0 - 9 \n or a backslash /");
> event.returnValue = false;
> }
>}[/color]
There is no need to check the characters in that manner if the data will
be properly checked with a RegExp.
[color=blue]
>function checkFormat(obj) {
>// d/m/yyyy d 1-9 , m 1-9
> var a = /^[1-9]\/[1-9]\/\d{4}$/.test(obj.value);
>// d/mm/yyyy d 1-9 , m 10-12
> var b = /^[1-9]\/[1][0-2]\/\d{4}$/.test(obj.value);
>// dd/m/yyyy d 10-29, m 1-9
> var c = /^[1-2][0-9]\/[1-9]\/\d{4}$/.test(obj.value);
>// dd/m/yyyy d 30-31, m 1-9
> var d = /^[3][0-1]\/[1-9]\/\d{4}$/.test(obj.value);
>// dd/mm/yyyy d 10-29, m 10-12
> var e = /^[1-2][1-9]\/[1][0-2]\/\d{4}$/.test(obj.value);
>//dd/mm/yyyy d 30-31, m 10-12
> var f = /^[3][0-1]\/[1][0-2]\/\d{4}$/.test(obj.value);
> if(a || b || c || d || e || f) {
> var y =
>/^[1][9][3-9][0-9]$/.test(obj.value.substr(obj.value.lastIndexOf("/")+1));
> var z =
>/^[2][0][0][0-9]$/.test(obj.value.substr(obj.value.lastIndexOf("/")+1));
> alert(y || z) ; // if true submit.
> }
>}[/color]
Consider :
function CF(Ob) { var S, Y, M, D
if (!/^\d\d?\/\d\d?\/\d{4}$/.test(Ob.value)) return false // #
S = Ob.value.split("/")
Y = +S[2] ; M = S[1]-1 ; D = +S[0]
if (Y<1930 || Y>2008) return false
with (new Date(Y, M, D)) return getMonth()==M && getDate()==D
}
That accepts d[d]/m[m]/yyyy and checks for representing an actual date
in the range.
ISTM that almost anything plausible that the RegExp would reject would
otherwise be rejected subsequently.
The RegExp guarantees that Y will be a number; otherwise, one might wish
to rearrange the tests on Y so as to give the desired result if Y is
NaN.
--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4 ©
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