// -------------------------------------------------------------------
// selectUnselectMatchingOptions(select_object,regex,select/unselect,true/false)
//  This is a general function used by the select functions below, to
//  avoid code duplication
// -------------------------------------------------------------------
function selectUnselectMatchingOptions(obj,regex,which,only) {
	if (window.RegExp) {
		var selected1, selected2;
		if (which == "select") {
			selected1=true;
			selected2=false;
		} else if (which == "unselect") {
			selected1=false;
			selected2=true;
		} else {
			return;
		}
		var re = new RegExp(regex);
		for (var i=0; i<obj.options.length; i++) {
			if (re.test(obj.options[i].text)) {
				obj.options[i].selected = selected1;
			} else {
				if (only) {
					obj.options[i].selected = selected2;
				}
			}
		}
	}
}
		
// -------------------------------------------------------------------
// selectMatchingOptions(select_object,regex)
//  This function selects all options that match the regular expression
//  passed in. Currently-selected options will not be changed.
// -------------------------------------------------------------------
function selectMatchingOptions(obj,regex) {
	selectUnselectMatchingOptions(obj,regex,"select",false);
}
// -------------------------------------------------------------------
// selectOnlyMatchingOptions(select_object,regex)
//  This function selects all options that match the regular expression
//  passed in. Selected options that don't match will be un-selected.
// -------------------------------------------------------------------
function selectOnlyMatchingOptions(obj,regex) {
	selectUnselectMatchingOptions(obj,regex,"select",true);
}
// -------------------------------------------------------------------
// unSelectMatchingOptions(select_object,regex)
//  This function Unselects all options that match the regular expression
//  passed in. 
// -------------------------------------------------------------------
function unSelectMatchingOptions(obj,regex) {
	selectUnselectMatchingOptions(obj,regex,"unselect",false);
}
	
// -------------------------------------------------------------------
// sortSelect(select_object)
//   Pass this function a SELECT object and the options will be sorted
//   by their text (display) values
// -------------------------------------------------------------------
function sortSelect(obj) {
	var o = [];
	if (obj.options === null) {
		return;
	}
	for (var i=0; i<obj.options.length; i++) {
		o[o.length] = new Option( obj.options[i].text, obj.options[i].value, obj.options[i].defaultSelected, obj.options[i].selected) ;
	}
	if (o.length === 0) {
		return;
	}
	o = o.sort(function(a,b) { 
		if ((a.text+"") < (b.text+"")) {
			return -1;
		}
		if ((a.text+"") > (b.text+"")) {
			return 1;
		}
		return 0;
	});
	for (i=0; i<o.length; i++) {
		obj.options[i] = new Option(o[i].text, o[i].value, o[i].defaultSelected, o[i].selected);
	}
}

// -------------------------------------------------------------------
// selectAllOptions(select_object)
//  This function takes a select box and selects all options (in a 
//  multiple select object). This is used when passing values between
//  two select boxes. Select all options in the right box before 
//  submitting the form so the values will be sent to the server.
// -------------------------------------------------------------------
function selectAllOptions(obj) {
	for (var i=0; i<obj.options.length; i++) {
		obj.options[i].selected = true;
	}
}
	
// -------------------------------------------------------------------
// moveSelectedOptions(select_object,select_object[,autosort(true/false)[,regex]])
//  This function moves options between select boxes. Works best with
//  multi-select boxes to create the common Windows control effect.
//  Passes all selected values from the first object to the second
//  object and re-sorts each box.
//  If a third argument of 'false' is passed, then the lists are not
//  sorted after the move.
//  If a fourth string argument is passed, this will function as a
//  Regular Expression to match against the TEXT or the options. If 
//  the text of an option matches the pattern, it will NOT be moved.
//  It will be treated as an unmoveable option.
//  You can also put this into the <SELECT> object as follows:
//    onDblClick="moveSelectedOptions(this,this.form.target)
//  This way, when the user double-clicks on a value in one box, it
//  will be transferred to the other (in browsers that support the 
//  onDblClick() event handler).
// -------------------------------------------------------------------
function moveSelectedOptions(from,to) {
	// Unselect matching options, if required
	if (arguments.length>3) {
		var regex = arguments[3];
		if (regex != "") {
			unSelectMatchingOptions(from,regex);
		}
	}
	// Move them over
	var o;
	for (var i=0; i<from.options.length; i++) {
		o = from.options[i];
		if (o.selected) {
			var newOption  = new Option( o.text, o.value, false, false);
			newOption.className = o.className;
			to.options[to.options.length] = newOption;
		}
	}
	// Delete them from original
	for (i=(from.options.length-1); i>=0; i--) {
		o = from.options[i];
		if (o.selected) {
			from.options[i] = null;
		}
	}
	//	if ((arguments.length<3) || (arguments[2]==true)) {
	//		sortSelect(from);
	//		sortSelect(to);
	//		}
	from.selectedIndex = -1;
	to.selectedIndex = -1;
}

// -------------------------------------------------------------------
// copySelectedOptions(select_object,select_object[,autosort(true/false)])
//  This function copies options between select boxes instead of 
//  moving items. Duplicates in the target list are not allowed.
// -------------------------------------------------------------------
function copySelectedOptions(from,to) {
	var options = {};
	for (var i=0; i<to.options.length; i++) {
		options[to.options[i].value] = to.options[i].text;
	}
	for (i=0; i<from.options.length; i++) {
		var o = from.options[i];
		if (o.selected) {
			if (options[o.value] === null || options[o.value] === undefined || options[o.value] != o.text) {
				to.options[to.options.length] = new Option( o.text, o.value, false, false);
			}
		}
	}
	if ((arguments.length<3) || (arguments[2])) {
		sortSelect(to);
	}
	from.selectedIndex = -1;
	to.selectedIndex = -1;
}

// -------------------------------------------------------------------
// moveAllOptions(select_object,select_object[,autosort(true/false)[,regex]])
//  Move all options from one select box to another.
// -------------------------------------------------------------------
function moveAllOptions(from,to) {
	selectAllOptions(from);
	if (arguments.length==2) {
		moveSelectedOptions(from,to);
	} else if (arguments.length==3) {
		moveSelectedOptions(from,to,arguments[2]);
	} else if (arguments.length==4) {
		moveSelectedOptions(from,to,arguments[2],arguments[3]);
	}
}

// -------------------------------------------------------------------
// copyAllOptions(select_object,select_object[,autosort(true/false)])
//  Copy all options from one select box to another, instead of
//  removing items. Duplicates in the target list are not allowed.
// -------------------------------------------------------------------
function copyAllOptions(from,to) {
	selectAllOptions(from);
	if (arguments.length==2) {
		copySelectedOptions(from,to);
	} else if (arguments.length==3) {
		copySelectedOptions(from,to,arguments[2]);
	}
}

// -------------------------------------------------------------------
// swapOptions(select_object,option1,option2)
//  Swap positions of two options in a select list
// -------------------------------------------------------------------
function swapOptions(obj,i,j) {
	var o = obj.options;
	var i_selected = o[i].selected;
	var j_selected = o[j].selected;
	var temp = new Option(o[i].text, o[i].value, o[i].defaultSelected, o[i].selected);
	var temp2= new Option(o[j].text, o[j].value, o[j].defaultSelected, o[j].selected);
	o[i] = temp2;
	o[j] = temp;
	o[i].selected = j_selected;
	o[j].selected = i_selected;
}
	
// -------------------------------------------------------------------
// moveOptionUp(select_object)
//  Move selected option in a select list up one
// -------------------------------------------------------------------
function moveOptionUp(obj) {
	// If > 1 option selected, do nothing
	var selectedCount=0;
	for (var i=0; i<obj.options.length; i++) {
		if (obj.options[i].selected) {
			selectedCount++;
		}
	}
	if (selectedCount!=1) {
		return;
	}
	// If this is the first item in the list, do nothing
	i = obj.selectedIndex;
	if (i === 0) {
		return;
	}
	swapOptions(obj,i,i-1);
	obj.options[i-1].selected = true;
}

// -------------------------------------------------------------------
// moveOptionDown(select_object)
//  Move selected option in a select list down one
// -------------------------------------------------------------------
function moveOptionDown(obj) {
	// If > 1 option selected, do nothing
	var selectedCount=0;
	for (var i=0; i<obj.options.length; i++) {
		if (obj.options[i].selected) {
			selectedCount++;
		}
	}
	if (selectedCount != 1) {
		return;
	}
	// If this is the last item in the list, do nothing
	i = obj.selectedIndex;
	if (i == (obj.options.length-1)) {
		return;
	}
	swapOptions(obj,i,i+1);
	obj.options[i+1].selected = true;
}

// -------------------------------------------------------------------
// removeSelectedOptions(select_object)
//  Remove all selected options from a list
//  (Thanks to Gene Ninestein)
// -------------------------------------------------------------------
function removeSelectedOptions(from) { 
	for (var i=(from.options.length-1); i>=0; i--) { 
		var o=from.options[i]; 
		if (o.selected) { 
			from.options[i] = null; 
		} 
	} 
	from.selectedIndex = -1; 
} 

// -------------------------------------------------------------------
// removeAllOptions(select_object)
//  Remove all options from a list
// -------------------------------------------------------------------
function removeAllOptions(from) { 
	for (var i=(from.options.length-1); i>=0; i--) { 
		from.options[i] = null; 
	} 
	from.selectedIndex = -1; 
}
