// formcheck.inc.js

function JS_trimLeft(s) {
	var whitespaces = " \t\n\r";
	for(n = 0; n < s.length; n++) { 
		if (whitespaces.indexOf(s.charAt(n)) == -1) 
			return (n > 0) ? s.substring(n, s.length) : s; 
	}
	return("");
}
function JS_trimRight(s){
	var whitespaces = " \t\n\r";
	for(n = s.length - 1; n  > -1; n--) { 
		if (whitespaces.indexOf(s.charAt(n)) == -1) 
			return (n < (s.length - 1)) ? s.substring(0, n+1) : s; 
	}
	return("");
}
function JS_trim(s) {
	return ((s == null) ? "" : JS_trimRight(JS_trimLeft(s))); 
}
function JS_isBlank(field, strBodyHeader) {
	strTrimmed = JS_trim(field.value);
	if (strTrimmed.length > 0) return false;
	alert("\"" + strBodyHeader + "\"  is een verplicht veld. Type een waarde aub");
	field.focus();
	return true;
}
function JS_isBadURL(field, strBodyHeader) {
	strTrimmed = JS_trim(field.value);
	if (strTrimmed.length == 0 || strTrimmed.substring(0,7) == 'http://' || strTrimmed.substring(0,6) == 'ftp://') return false;
	alert("\"" + strBodyHeader + "\"  is een ongeldige url.");
	field.focus();
	return true;
}
function JS_isNumber(field, strBodyHeader) {
	var strVal = JS_trim(field.value);
	if (strVal.length == 0 || strVal.length > 999) return false;
	var 	x = 0;
	for (i=0;i < strVal.length; i++) { 
		if (strVal.charAt(i) > '0' && strVal.charAt(i) < '9') x++;
	}
	if (strVal.length > x) {
		alert("Invalid value for field \""+ strBodyHeader + "\". Please type in a valid integer.");
		field.focus();
		return false;
	} else {
		return true;
	}
}
function JS_isEmail(field, strBodyHeader) {
	var strMsg = ""; 
	var chAt  = '@'; 
	var chDot = '.'; 
	var strEmailAddr = JS_trim(field.value);
	   if (strEmailAddr.length == 0) return true;
	   if (strEmailAddr.indexOf(" ") == -1)
	   {
	       var iFirstAtPos = strEmailAddr.indexOf(chAt);
	       var iLastAtPos = strEmailAddr.lastIndexOf(chAt);
	       if (iFirstAtPos > 0 && iFirstAtPos < (strEmailAddr.length - 1) &&iFirstAtPos == iLastAtPos) {
		   // look for '.' there must be at least one char between '@' and '.'
		   var iDotPos = strEmailAddr.indexOf(chDot, iFirstAtPos + 1);
		   if (iDotPos > (iFirstAtPos + 1) && iDotPos < (strEmailAddr.length -1)) return true;
	       }
	   }
	   alert(" ongeldig email adres. Type een goed email adres voor het veld:\"" + strBodyHeader + "\"");
	   field.focus();
	   return false;
}

function JS_makeParent(rid, subject) { 
//        alert(rid);
	document.Com.parentid.value = rid;
   if (subject.substring(0,3)!='Re:') subject = 'Re: '+subject;
   
   document.Com.subject.value = subject;
   
}

var form_submitted = false;

function validateComment() 
{

    if (document.Com.anon && !document.Com.anon.checked) 
    {

	   field = document.Com.author; 
	   if (JS_isBlank(field, "Naam")) return false;

           
	     field = document.Com.authoremail; 
	     if (JS_isBlank(field, "E-Mail")) return false;
	     if (!JS_isEmail(field, "E-Mail")) return false;
            }
     
	field = document.Com.content;
	if (JS_isBlank(field, "Reactie")) return false;
      
   if (form_submitted)
   {
    return false;
   }
   form_submitted = true;
   return true;
}