function ValidateAndSubmit() { var msg = ""; if (document.form1.nom.value == "") msg += "- Il manque le nom\n"; if (document.form1.mail.value == "") msg += "- Il manque l'adresse mail\n"; else if (!isEmail(document.form1.mail.value)) msg += "- Le format d'adresse mail est invalide ("+document.form1.mail.value+")\n" if (document.form1.message.value == "") msg += "- Il manque le message\n"; if (msg != "") alert(msg); else document.form1.submit(); } var whitespace = " \t\n\r"; function isEmpty(s) { return ((s == null) || (s.length == 0)) } function isWhitespace (s) { var i; // Is s empty? if (isEmpty(s)) return true; // Search through string's characters one by one // until we find a non-whitespace character. // When we do, return false; if we don't, return true. for (i = 0; i < s.length; i++) { // Check that current character isn't whitespace. var c = s.charAt(i); if (whitespace.indexOf(c) == -1) return false; } // All characters are whitespace. return true; } function isEmail (s) { if (isEmpty(s)) return false; // is s whitespace? if (isWhitespace(s)) return false; // there must be >= 1 character before @, so we // start looking at character position 1 // (i.e. second character) var i = 1; var sLength = s.length; // look for @ while ((i < sLength) && (s.charAt(i) != "@")) { i++ } if ((i >= sLength) || (s.charAt(i) != "@")) return false; else i += 2; // look for . while ((i < sLength) && (s.charAt(i) != ".")) { i++ } // there must be at least one character after the . if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false; else return true; }