// JavaScript Document

var http_request = false;


//////////////////////////////////////////////////////////////////////////////////


function makePOSTRequest(url, parameters) {
  	http_request = false;
	 	//alert('2');
  
  	if (window.XMLHttpRequest) { 											// Mozilla, Safari,...
	 	http_request = new XMLHttpRequest();
	 	if (http_request.overrideMimeType) {
			// set type accordingly to anticipated content type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
	 	}
  	} 
	else if (window.ActiveXObject) { 										// IE
	 	try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
	 	}
		catch (e) {
			try {
		   		http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e) {}
	 	}
  	}
	if (!http_request) {
	 	alert('Cannot create XMLHTTP instance');
	 	return false;
  	}
  	http_request.onreadystatechange = alertContents;
  	http_request.open('POST', url, true);
  	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  	http_request.setRequestHeader("Content-length", parameters.length);
  	http_request.setRequestHeader("Connection", "close");
  	http_request.send(parameters);
}


//////////////////////////////////////////////////////////////////////////////////


function makeRequest(url, parameters) {										// nieuwsbrief.php?naam=waarde&naam=waarde&.....
	http_request = false;
      
	if (window.XMLHttpRequest) { 											// Mozilla, Safari,...
		http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
			// set type accordingly to anticipated content type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
        }
	}
	else if (window.ActiveXObject) { 										// IE
    	try {
    		http_request = new ActiveXObject("Msxml2.XMLHTTP");
        }
		catch (e) {
        	try {
               	http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } 
			catch (e) {}
    	}
	}
    if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
    }
    http_request.onreadystatechange = alertContents;
    http_request.open('GET', url + parameters, true);
    http_request.send(null);
}


/////////////////////////////////////////////////////////////////////////////////////////


function alertContents() {
  	if (http_request.readyState == 4) {
	 	if (http_request.status == 200) {
			//alert(http_request.responseText);
			result = http_request.responseText;
			document.getElementById('nieuwsbrief').innerHTML = result;            
		} 
	 	else {
			alert('There was a problem with the request.');
		}
  	}
}


/////////////////////////////////////////////////////////////////////////////////////////

function post(obj) {
  	var poststr = "naam=" + encodeURI( document.getElementById("naam").value ) + "&email=" + encodeURI( document.getElementById("email").value );
  	makePOSTRequest('include_nieuwsbrief.php', poststr);
}


/////////////////////////////////////////////////////////////////////////////////////////

 
function get(obj) {
  	var getstr = "?";																		// string opbouwen, het begint met een ?
  
  	for (i=0; i<obj.childNodes.length; i++) {
	 	if (obj.childNodes[i].tagName == "input") {											// alle input velden doorlopen
			if (obj.childNodes[i].type == "text") {											// string opbouwen uit text inputs
		   		getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";		// ...naam=waarde&...  
			}
			if (obj.childNodes[i].type == "checkbox") {										// string opbouwen uit checkboxes
		   		if (obj.childNodes[i].checked) {
			  		getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";	// ...naam=waarde&... 
		   		} 
				else {
			  		getstr += obj.childNodes[i].name + "=&";								// ...naam=&... (lege checkbox)
		   		}
			}
			if (obj.childNodes[i].type == "radio") {
		   		if (obj.childNodes[i].checked) {
			  		getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";	// ...naam=waarde&... (gechecked)
		   		}
			}
	 	}   
	 	if (obj.childNodes[i].tagName == "select") {										// alle select velden doorlopen
			var sel = obj.childNodes[i];
			getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";			// ...naam=waarde&... (gekozen optie)
	 	}
	}
  	makeRequest('include_nieuwsbrief.php', getstr);													// nieuwsbrief.php?naam=waarde&naam=waarde&..... 
}