// get selection list as element or radio/checkbox list as array
function ew_GetElements(name) {
	var ar = document.getElementsByName(name);
	if (ar.length == 1) {
		var el = ar[0];
		if (el.type && el.type != "checkbox" && el.type != "radio") 
			return ar[0];
	}	
	return ar;
}

// update multiple selection lists
function ew_UpdateOpts_2(ar) {
	if (ewLang.isArray(ar)) { 
		var u;
		var cnt = ar.length; 
		for (i = 0; i < cnt; i++) {
			u = ar[i];
			if (ewLang.isBoolean(u[2]) && !u[2]) { // Ajax and sync
				u[0] = {id: u[0], values: ew_GetOptValues(ew_GetElements(u[0]))};
				u[1] = {id: u[1], values: ew_GetOptValues(ew_GetElements(u[1]))};
			} else {				
				ew_UpdateOpt_2(u[0], u[1], u[2]);
			}   	
		}
		for (i = 0; i < cnt; i++) {
			u = ar[i];
			if (ewLang.isBoolean(u[2]) && !u[2]) {
				ew_UpdateOpt_2(u[0], u[1], true);			
			}   	
		}
	}
}

// update child element options
function ew_UpdateOpt_2(id, parent_id, ds) {
	var iff = -1;
	var oid, obj, ar, parentObj, arp; 		
	if (ewLang.isString(id)) {
		oid = id;
		obj = ew_GetElements(id);
		ar = ew_GetOptValues(obj);		
	} else if (ewLang.isObject(id)) {
		oid = id.id;
		obj = ew_GetElements(id.id);
		ar = id.values;		
	}
	if (ewLang.isString(parent_id)) {
		parentObj = ew_GetElements(parent_id);
		arp = ew_GetOptValues(parentObj);	
	} else if (ewLang.isObject(parent_id)) {
		parentObj = ew_GetElements(parent_id.id);
		arp = parent_id.values;
		parent_id = parent_id.id;	
	}	
	var id = ew_GetId(obj);
	ew_ClearOpt(obj);
	var addOpt = function(aResults) {
		var cnt = aResults.length;		
		for (var i=0; i<cnt; i++) {
			if (iff == 3) {
				for (var j=0; j<arp.length; j++) {
					if (aResults[i][3].toUpperCase() == arp[j].toUpperCase()) {
						ew_NewOpt(obj, aResults[i][0], aResults[i][1], aResults[i][2]);
						break; 
					}
				}
			} else {
				ew_NewOpt(obj, aResults[i][0], aResults[i][1], aResults[i][2]);
			}					
		}
		if (obj.length) // radio/checkbox list
			ew_RenderOpt(obj);
		ew_SelectOpt(obj, ar);	
	} 
	if (ewLang.isArray(ds)) { // array => non-Ajax
		iff = 3;
		addOpt(ds);
	} else if (ewLang.isBoolean(ds)) { // async => Ajax
		var async = ds;
		var f = ewDom.getAncestorByTagName(ewDom.get(oid), "FORM");
		if (!f)
			return;
		var s = f.elements["s_" + id];	
		var lft = f.elements["lft_" + id];		
		if (!s || s.value == "")
			return;		
		var cb = {			
			success: function(oResponse) {
				var txt = oResponse.responseText; 
				if (txt.length > 0) {          
					var newLength = txt.length - EW_RECORD_DELIMITER.length;
					if (txt.substr(newLength) == EW_RECORD_DELIMITER)
						txt = txt.substr(0, newLength);
					var aResults = [];					
					var aRecords = txt.split(EW_RECORD_DELIMITER);					
					for (var n = aRecords.length-1; n >= 0; n--)
						aResults[n] = aRecords[n].split(EW_FIELD_DELIMITER);
					addOpt(aResults);				
				}
			},
			failure: function(oResponse) {						
			},			
			scope: this,
			argument: null
		}
		var o = ewConnect.getConnectionObject(false);
		if (o) {		
			var url = "ewlookup6.php?s=" + s.value + "&f=" + encodeURIComponent(arp.join(",")) +
				"&lft=" + encodeURIComponent(lft.value);			
			o.conn.open("get", url, async);
			if (async)
				ewConnect.handleReadyState(o, cb);
			o.conn.send(null);
			if (!async)
				ewConnect.handleTransactionResponse(o, cb); 
		}
	}		
}

// Render repeat column table (rowcnt is zero based row count)
function ew_RepeatColumnTable(totcnt, rowcnt, repeatcnt, rendertype) {
	var sWrk = "";
	if (rendertype == 1) { // render start
		if (rowcnt == 0)
			sWrk += "<table class=\"" + EW_ITEM_TABLE_CLASSNAME + "\">";
		if (rowcnt % repeatcnt == 0)
			sWrk += "<tr>";
		sWrk += "<td>";
	} else if (rendertype == 2) { // render end
		sWrk += "</td>";
		if (rowcnt % repeatcnt == repeatcnt - 1) {
			sWrk += "</tr>";
		} else if (rowcnt == totcnt - 1) {
			for (i = (rowcnt % repeatcnt) + 1; i < repeatcnt; i++)
				sWrk += "<td>&nbsp;</td>";
			sWrk += "</tr>";
		}
		if (rowcnt == totcnt - 1) sWrk += "</table>";
	}
	return sWrk;
}

// Get existing selected values
function ew_GetOptValues(obj) {
	var ar = [];
	if (obj.options) { // selection list
		for (i=0; i<obj.options.length; i++) {
			if (obj.options[i].selected)
				ar.push(obj.options[i].value);
		}
	} else if (obj.length) { // radio/checkbox list
		var i, el;		
		var cnt = obj.length;		
		for (i=0; i<cnt; i++) {
			el = obj[i];
			if (el.checked)
				ar.push(el.value);
		}	
	} else if (obj) { // radio/checkbox/text/hidden
		ar.push(obj.value);
	}
	return ar;
}

// Clear existing options
function ew_ClearOpt(obj) {
	if (obj.options) { // selection list
		var lo = (obj.type == "select-multiple") ? 0 : 1;
		for (var i=obj.length-1; i>=lo; i--)
			obj.options[i] = null;
	} else if (obj.length) { // radio/checkbox list
		var id = ew_GetId(obj); 
		var p = document.getElementById("dsl_" + id); // parent element
		if (p) {
			var els = ewDom.getChildrenBy(p, function(node) {
				return (node.tagName == "TABLE" && node.className == EW_ITEM_TABLE_CLASSNAME);
			});			
			for (var i=0; i<els.length; i++)
				p.removeChild(els[i]);
			p._options = [];
		}
	}
}

// Get the id or name of an element
function ew_GetId(obj) {
	var id = "";
	if (!obj.options && obj.length)
		obj = obj[0];
	if (obj.id && obj.id != "") {
		id = obj.id;
	} else if (obj.name && obj.name != "") {
		id = obj.name;
	}
	if (id.substr(id.length-2, 2) == "[]")
		id = id.substr(0, id.length-2); 	
	return id;
}

// Render the options
function ew_RenderOpt(obj) {
	var id = ew_GetId(obj); 
	var p = document.getElementById("dsl_" + id); // parent element
	var t = document.getElementById("tp_" + id); // get the item template	
	if (!p || !p._options || !t)
		return;
	var cnt = p._options.length;
	var cols = p.getAttribute("repeatcolumn");
	if (!cols || cols == NaN || cols < 1)
		cols = 5;
	var tpl = t.innerHTML;		 
	var html = "";
	var ihtml;
	for (var i=0; i<cnt; i++) {
		html += ew_RepeatColumnTable(cnt, i, cols, 1);
		ihtml = tpl;
		ihtml = ihtml.replace(/{value}/g, ew_HtmlEncode(p._options[i].val)); // replace value		
		html += "<label>" + ihtml + p._options[i].lbl + "</label>";		
		html += ew_RepeatColumnTable(cnt, i, cols, 2);		
	} 
	p.innerHTML += html;
	p._options = [];		
}