Preventing non-numeric values being entered into a field.

[mike55]

Hi,

 

Is there any javascript available whereby I can prevent the user from entering non-numeric values into a textfield as they are typing data into the field. Or is this requirement undoable.

 

Mike55.

[kahlua001]

JS has isNaN() function, Is Not a Number, you can use this on a blur of the textbox or keydown.

 

if (isNaN('test')) {

alert('This is not a number!');

}