validating a number entered in a textfield

Hi friends,
My form have a text field named "price" which should have only number and if it contains decimal number then it should not have more than two numbers after decimal. I tried this but it is not working . If the data entered is valid (as described above) then it should post to the target.php .....

I hope u will point out my mistake OR u may advice some wise alternative for this ..
thanks.....
The code goes as follows.....

[HTML]<html>
<head>
<script type="text/javascript">
function checkForm()
{
// var price = document.form1.price;
document.form1.submit();

var value=document.getElementById('price').value;
var indx=value.indexOf('.');
var digit=value.substring(indx+1);

if(digit.length>2)
{
alert('only two decimal digit allowed');
document.form1.price.focus();
price.select();
document.form1.price.focus();
return false;
}
else
{
document.form1.submit();

}
}
</script>
</head>
<body>
<form name="form1" id="price" method="post" action="print selected area.html" >

<input name="price" type="text" id="price" size="25" maxlength="16" />

<input type="button" name="submit" value="ADD" onsubmit="chkForm()"/>
</form>
</body>
</html>
[/HTML]

Dec 27 '07 #1

Subscribe Post Reply

1632

foss

Sorry to disturb u friends .
I got the solution to the problem . I has made some silly mistakes
the solution is

[HTML]<html>
<head>
<script type="text/javascript">

function check_price()
{
// var price = document.form1.price;
var value=document.getElementById('price').value;
var indx=value.indexOf('.');
var digit=value.substring(indx+1);

if (isNaN(value)== true )
{
alert("Please enter a valid number");
document.form1.price.focus();
price.select();
document.form1.price.focus();
return false;
}

else if(digit.length>2)
{
alert('Only two decimal digits allowed');
document.form1.price.focus();
price.select();
document.form1.price.focus();
return false;
}
else
{
document.form1.submit();
}

}

</script>
</head>
<body>
<form name="form1" method="post" action="control_center.php" >

<input name="price" type="text" id="price" size="25" maxlength="16" />

<input type="button" name="submitButton" value="ADD" onFocus="check_price()"/>
</form>
</body>
</html>[/HTML]

Dec 27 '07 #2

acoder

16,027

Expert Mod 8TB

Sorry to disturb u friends .
I got the solution to the problem . I has made some silly mistakes
the solution is

price.select() would result in an error because the line defining price at the beginning of the function has been commented out.

Dec 27 '07 #3

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