var alpha = "[ A-Za-z]"; var numeric = "[0-9]"; var alphanumeric = "[ A-Za-z0-9]"; function onKeyValidate(e,charVal){ var keynum; var keyChars = /[\x00\x08]/; var validChars = new RegExp(charVal); if(window.event) { keynum = e.keyCode; } else if(e.which) { keynum = e.which; } var keychar = String.fromCharCode(keynum); if (!validChars.test(keychar) && !keyChars.test(keychar)) { return false } else{ return keychar; } } <input type="text" value="" name="first_name" id="first_name" placeholder="First Name" onkeypress="return onKeyValidate(event,alpha);"/>
var
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