validating quantity

**McKirahan** · Jul 23 '05, 04:48 PM

Re: validating quantity

"Terje" <terje@cyberfac tory.no> wrote in message
news:nmwJd.8520 7$Vf.3768343@ne ws000.worldonli ne.dk...[color=blue]
> Hello I have a function like this
>
> function checkquantitiy( quantitiy){
>
> if(quantitiy.va lue != parseInt(quanti tiy.value)) {
> alert(quantitiy .value+" sorry not integer quantitiy");
> }
>
> } //End of function
>
> This check if quantitiy is integer. In the form I have following
>
> <input name="buyquanti tiy" type="hidden" id="buyquantiti y" value="<?php[/color]
echo[color=blue]
> $buyquantitiy; ?>" size="1" maxlength="3">
> <input name="quantitiy " type="text" id="quantitiy" value="1" size="1"
> maxlength="3" onchange="javas cript:return checkquantitiy( this);">
>
> The problem is when i will calculate if quantitiy/buyquantitiy is an
> integer. The reason is that some products can only be seld as 4 items, and
> if you press 3 wou should get a message that says
> "Sorry a quantity of 3 are not aviable because there are 4 items in
> package". Can transfer 2 varibales into the function? Or have anyone any
> suggestion how to solve this.
>
> Terje[/color]

Is "quantitiy" in Norwegian for the English "quantity"?

Will this help?

A second parameter is passed which, if non-zero, will be used to validate
the minimum "quantitiy" .

<html>
<head>
<title>quantity .htm</title>
<script type="text/javascript">
function checkQty(qty,mi n){
if (qty.value != parseInt(qty.va lue,10)) {
alert("Quantiti y not numeric");
} else if (min > 0 && qty.value < min) {
alert("Quantiti y below minimum of " + min);
}
}
</script>
</head>
<body>
<form action="" method="post" name="form1">
<input type="text" name="quantitiy " id="quantitiy"
value="1" size="1" maxlength="3"
onchange="check Qty(this,4);">
</form>
</body>
</html>

If "1" is a desired value then it will not be validated as the "onchange() "
event does not fire.

**Fred Oz** · Jul 23 '05, 04:48 PM

Re: validating quantity

McKirahan wrote:
[...][color=blue]
> if (qty.value != parseInt(qty.va lue,10)) {
> alert("Quantiti y not numeric");[/color]

0.5 will fail the test, but it is certainly a numeric value. The
original error message was better:

alert(quantitiy .value+" sorry not integer quantitiy");

But why not:

alert("Quantity must be a whole number of "
+ min + " or more.");

Then the same error message can be used for both cases.

--
Fred

**Dr John Stockton** · Jul 23 '05, 04:49 PM

Re: validating quantity

JRS: In article <nmwJd.85207$Vf .3768343@news00 0.worldonline.d k>, dated
Tue, 25 Jan 2005 19:38:23, seen in news:comp.lang. javascript, Terje
<terje@cyberfac tory.no> posted :[color=blue]
>Hello I have a function like this
>
>function checkquantitiy( quantitiy){
>
> if(quantitiy.va lue != parseInt(quanti tiy.value)) {
> alert(quantitiy .value+" sorry not integer quantitiy");
> }
>
>} //End of function
>
>This check if quantitiy is integer. In the form I have following
>
><input name="buyquanti tiy" type="hidden" id="buyquantiti y" value="<?php echo
>$buyquantiti y; ?>" size="1" maxlength="3">
> <input name="quantitiy " type="text" id="quantitiy" value="1" size="1"
>maxlength="3 " onchange="javas cript:return checkquantitiy( this);">
>
>The problem is when i will calculate if quantitiy/buyquantitiy is an
>integer. The reason is that some products can only be seld as 4 items, and
>if you press 3 wou should get a message that says
>"Sorry a quantity of 3 are not aviable because there are 4 items in
>package". Can transfer 2 varibales into the function? Or have anyone any
>suggestion how to solve this.[/color]

See <URL:http://www.merlyn.demo n.co.uk/js-valid.htm>.

The best way to validate such starts with a RegExp;

input = quantity.value
OK = /^\d+$/.test(input) // all digits
OK = /^[1-9]\d*$/.test(input) // all digits, not starting 0

If OK, input = +input will safely convert to string.

With a RegExp /^\d{1,3}$/ you can allow at most 3 digits, if that's
useful.

OK = /^[1-9]\d*$/.test(input) && input%4==0 // & divisible by 4

But, to transfer two parameters into a function
function Add(X, Y) { return X+Y } // for numbers
function Add(X, Y) { return +X + +Y } // for numbers/strings

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

validating quantity

validating quantity

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