/*
 * Form validation:
 * http://www.webcheatsheet.com/javascript/form_validation.php
 */
function validateFormOnSubmit(theForm) {
var reason = "";

  reason += validateEmpty(theForm.fullname,'名前を入力してください');
  reason += validateEmpty(theForm.company,'勤務先の名前を入力してください');
  reason += validatePhone(theForm.phone);
  reason += validateEmail(theForm.email);
      
  if (reason != "") {
    alert("一部のフィールドに修正が必要です:\n" + reason);
    return false;
  }

  return true;
}

function validateEmpty(fld,txt) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = '#FFEB94'; 
        error = txt+".\n"						// "Please enter your "+
    } else {
        fld.style.background = '#ffffff';
    }
    return error;   
}

function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
} 

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
        fld.style.background = '#FFEB94';
        error = "有効な電子メールアドレスを入力してください.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = '#FFEB94';
        error = "有効な電子メールアドレスを入力してください.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = '#FFEB94';
        error = "有効な電子メールアドレスを入力してください.\n";
    } else {
        fld.style.background = '#ffffff';
    }
    return error;
}

function validatePhone(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "電話番号を入力してください.\n";
        fld.style.background = '#FFEB94';
    } else if (isNaN(parseInt(stripped))) {
        error = "電話番号に無効な文字が含まれています。.\n";
        fld.style.background = '#FFEB94';
    } else {
        fld.style.background = '#ffffff';
    }
    return error;
}