function formValidator(){ // References to fields var firstname = document.getElementById('first_name'); var surname = document.getElementById('last_name'); var email = document.getElementById('email'); var referer = document.getElementById('source'); if(isAlphabet(firstname, "Please enter your name")){ if(isAlphabet(surname, "Please enter your last name")){ if(emailValidator(email, "Please enter a valid email address")){ if(madeSelection(referer, "Where did you here about us?")){ return true; } } } } return false; } function isEmpty(elem, helperMsg){ if(elem.value.length == 0){ alert(helperMsg); elem.focus(); // set the focus to this input return true; } return false; } function isAlphabet(elem, helperMsg){ var alphaExp = /^[\ \]+\-\[a-zA-Z]+$/; if(elem.value.match(alphaExp)){ return true; }else{ alert(helperMsg); elem.focus(); return false; } } function isAlphanumeric(elem, helperMsg){ var alphaExp = /^[\ \]+\,\n\r\/\-\(\)\!\?\'\.\&[0-9a-zA-Z]+$/; if(elem.value.match(alphaExp)){ return true; }else{ alert(helperMsg); elem.focus(); return false; } } function emailValidator(elem, helperMsg){ var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/; if(elem.value.match(emailExp)){ return true; }else{ alert(helperMsg); elem.focus(); return false; } } function madeSelection(elem, helperMsg){ if(elem.value == "nothing_selected"){ alert(helperMsg); elem.focus(); return false; }else{ return true; } } function isNumeric(elem, helperMsg){ var numericExpression = /^[\ \]+[0-9]+$/; if(elem.value.match(numericExpression)){ return true; }else{ alert(helperMsg); elem.focus(); return false; } }