Testing for NaN ...

[mdumka]

Hello ...

How can I test if a value of a textbox is NaN ...

Thanks, Mike

[mrhoo]

if(isNaN(textbox.value))alert(text box does not contain a number)

[temp304]

isNaN Method
Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).

The isNaN function returns true if the value is NaN, and false otherwise. You typically use this function to test return values from the parseInt and parseFloat methods.
Alternatively, a variable could be compared to itself. If it compares as unequal, it is NaN. This is because NaN is the only value that is not equal to itself.

[mdumka]

Thats great ... thanks for the help guys.