/*
// +----------------------------------------------------------------------+
// | Inspired by Code that is Copyright (c) 2004 Bitflux GmbH             |
// |     http://blog.bitflux.ch/p1735.html                                |
// | And heavily modified by Jeff Minard                                  |
// |     http://www.creatimation.net                                      |
// +----------------------------------------------------------------------+
// | Dependent on SACK which is Copyright (c) 2005 Gregory Wild-Smith     |
// |     http://twilightuniverse.com/resources/code/sack/                 |
// +----------------------------------------------------------------------+
// | Author: Michael D. Adams                                             |
// |     http://blogwaffe.com/                                            |
// +----------------------------------------------------------------------+
// | Version:  0.8.0                                                      |
// +----------------------------------------------------------------------+
// | License: GPL2                                                        |
// |     http://www.gnu.org/copyleft/gpl.html                             |
// +----------------------------------------------------------------------+
*/

var commentPreview;
var commentPreviewLast = '';

var inputElement;
var outputElement;
var doitElement;
var authorElement;
var urlElement;

function commentPreviewInit() {
	inputElement  = document.getElementById(inputId);
	outputElement = document.getElementById(outputId);
	doitElement   = document.getElementById(doitId);
	authorElement = document.getElementById(authorId);
	urlElement    = document.getElementById(urlId);
	
	if ( inputElement == null || outputElement == null || doitElement == null ) 
		return;

	doitElement.onclick = commentPreviewAJAX;
	
	// set the result field to hidden, or to default string
	if ( '' == emptyString ) outputElement.style.display = 'none';
	else outputElement.innerHTML = emptyString;
}

addLoadEvent(commentPreviewInit);

function commentPreviewAJAX() {
	var req = '';

	commentPreview = new sack(processURI);
	commentPreview.method = 'POST';
	commentPreview.encodeURIString = false;
	commentPreview.onLoading = function() { outputElement.innerHTML = 'Loading.'; };
	commentPreview.onLoaded = function() { outputElement.innerHTML += '.'; };
	commentPreview.onInteractive = function() { outputElement.innerHTML += '.'; };
	commentPreview.onCompletion = function() { outputElement.innerHTML = commentPreview.response; };

	req = commentPreview.encVar('text', inputElement.value);
	req += authorElement ? '&' + commentPreview.encVar('author', authorElement.value) + '&' + commentPreview.encVar('url', urlElement.value) : '';

	if ( req != commentPreviewLast && '' != inputElement.value ) {
		commentPreview.runAJAX(req);
	} else if ( '' == inputElement.value ) {
		if( '' == emptyString ) {
			outputElement.innerHTML = '';
			outputElement.style.display = "none";
		} else {
			outputElement.innerHTML = emptyString;
		}
	}
	commentPreviewLast = req;
}

//Simon Willison http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}