regexp problem

godhsf80 · March 10th, 2004, 04:19 AM

i have a textbox that will let user to enter the product's price but i have to check if user enter two decimal meaning

12.30, 9.55, 1478.90 is true
12.3, 9.568, 1478.9807 is false

function validdecimal(textbox)
{
if ( /[^0-9]/.test(textbox.value) )
{
alert("Please enter string");
textbox.select();
textbox.focus();
}
}

How can i change the function above to check if the user enter the right price?

richard.york · March 10th, 2004, 04:43 AM

I'd use two functions..

Code:

<?php

function is_price($value)
{
    return (is_numeric($value))? round($value, 2) : FALSE;
}

echo is_price(3.456).'<br />';
echo is_price(3.45).'<br />';
echo is_price('doh');

// Or a better implementation

if (FALSE === ($value = is_price(3.456)))
{
    echo 'You did not enter a valid number';    
}
else
{
    echo $value.' is a valid number';    
}

?>

This will gaurantee that no matter what the value, it will return a value rounded to two decimal places and verify that the value provided is a number.

hth,
Rich

:::::::::::::::::::::::::::::::::
Smiling Souls
http://www.smilingsouls.net
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richard.york · March 10th, 2004, 04:54 AM

Oh -- you're using JavaScript...
(This is a PHP forum BTW)

You can do something similar with JS though... here is a JavaScript equivilant to the PHP.

function is_price(value)
{
return (isNaN(value))? FALSE : Math.round(value*100)/100;
}

hth,
Rich

:::::::::::::::::::::::::::::::::
Smiling Souls
http://www.smilingsouls.net
:::::::::::::::::::::::::::::::::