// JavaScript Document

// checks entire form
function validateformonsubmit(f1) {
var reason = "";

  reason += validateVisitor(f1.visitor);
  reason += validateCompany(f1.company);
  reason += validateTelephone(f1.telephone);
  reason += validateEmail(f1.visitormail);
  reason += validateNotes(f1.notes);
  
  
  
  
  
      
  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  }

  return true;
}


// colours form areas which have not yet been filled
function validateVisitor(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please type in your name.\n"
    } else if (fld.value.length > 40) {
		fld.style.background = 'Yellow';
		error = "Please use less than 40 Characters for your name.\n"
	} else {
        fld.style.background = 'White';
    }
    return error;  
}

// Validates Company Name
function validateCompany(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Company name required.\n"
    } else if (fld.value.length > 50) {
		fld.style.background = 'Yellow';
		error = "Please use less than 50 Characters for your name.\n"
	} else {
        fld.style.background = 'White';
    }
    return error;  
}

// Validates Phone
function validateTelephone(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Telephone number required.\n"
    } else if (fld.value.length > 15) {
		fld.style.background = 'Yellow';
		error = "Please use less than 15 Characters for your telephone number.\n"
	} else {
        fld.style.background = 'White';
    }
    return error;  
}

// Validates Phone
function validateNotes(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Comments are required.\n"
   	} else {
        fld.style.background = 'White';
    }
    return error;  
}




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


// Validates email address
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 = 'Yellow';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}