allowing only alphabets in text box using java script

Question

I want to allow only alphabets in textbox using JavaScript I used the code:

var nam=f.nm.value;
if(!isNaN(nam))  
    region.innerHTML=\"alphabets only\";
<         


        

Answer 1

:::::HTML:::::

Only letters no spaces

::::JS::::::::

// ===================== Allow - Only Letters ===============================================================

function lettersValidate(key) {
    var keycode = (key.which) ? key.which : key.keyCode;

    if ((keycode > 64 && keycode < 91) || (keycode > 96 && keycode < 123))  
    {     
           return true;    
    }
    else
    {
        return false;
    }
         
}