// Vérifie qu'une checkbox est cochée
function isChecked(cb) {
  if (cb.checked == true) {
    return true;  
  }
  alert("Pour envoyer votre message, veuillez cocher la case \"J'accepte que les informations données ci-dessus soient traitées électroniquement\"");
  return false;
}

// Boucle de validation
function validateForm(form) {
  if (isChecked(form.acceptation_contact)) {
  	if (isNotEmpty(form.nom_contact)) {
  		if (isNotEmpty(form.prenom_contact)) {
  			if (isNotEmpty(form.email_contact)) {
                  if (isEMailAddr(form.email_contact)) {
  					return true;
                  }
  			}
  		}
  	}
  }	
  return false;
}

// Vérifie si un champ a bien été renseigné
function isNotEmpty(elem) {
	var str = elem.value;
    var re = /.+/;
    if(!str.match(re)) {
        alert("Merci de renseigner les champs obligatoires.");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    } else {
        return true;
    }
}

// Vérifie si l'adresse e-mail est valide
function isEMailAddr(elem) {
	var str = elem.value;
    var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
    if (!str.match(re)) {
        alert("Veuillez vérifier le format de votre adresse e-mail.");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    } else {
        return true;
    }
}

//Vérifie si un champ ne contient que des chiffres
function isNumber(elem) {
	var str = elem.value;
    var re = /^[-]?\d*\.?\d*$/;
    str = str.toString();
    if (!str.match(re)) {
        alert("");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    }
    return true;
}

// Vérifie si un champ contient 8 caractères
function isLen8(elem) {
	var str = elem.value;
    var re = /\b.{8}\b/;
    if (!str.match(re)) {
        alert("");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    } else {
        return true;
    }
}

// Positionne le curseur dans un champ donné
function focusElement(formName, elemName) {
    var elem = document.forms[formName].elements[elemName];
    elem.focus();
    elem.select();
}

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