function cancelEvent(e)
{
	if(!e)
		e = window.event;
	if(!e)
		return false;
	if(e.stopPropagation)
		e.stopPropagation();
	if(e.preventDefault)
		e.preventDefault();
	e.cancelBubble = true;
	e.cancel = true;
	e.returnValue = false;
	return false;
}



var element_counter = 4;



function add_another_element(button, load_options)
{
	var parent_box;
	if (button == null)
	{
		all_boxes = $('.search_element');
		parent_box = $(all_boxes[all_boxes.length-1]);
		//parent_box = $($('.search_element')[0]);
	}
	else
		parent_box = $(button).parents('.search_element');
	var new_box = parent_box.clone();
	new_box.find('.add_all_query_elements_button').remove();
	new_box.find('.remove_query_element_button').show();
	new_box.find('.search_element_options_pre, .search_element_options_post').hide();
	
	var s_op = new_box.find('.operator_menu');
	s_op.show();
	s_op.attr('name', "q_"+(element_counter));	
	s_op.attr('id', "q_"+(element_counter++));	
	var s_menu = new_box.find('.search_field_menu');
	s_menu.css('margin-left','0px');
	s_menu.attr('name', "q_"+(element_counter));	
	s_menu.attr('id', "q_"+(element_counter++));	
	var s_val_box = new_box.find('.search_elem_value_box');
	s_val_box.val("");
	s_val_box.attr('name', "q_"+(element_counter));	
		
	var s_val = new_box.find('.search_value');
	s_val.val("");
	s_val.attr('name', "q_"+(element_counter));	
	s_val.attr('id', "q_"+(element_counter++));	
	
	
	
	$(parent_box).after(new_box);
	if (load_options == true)
		load_search_element_options(new_box.find('.search_field_menu'), null, "");
	new_box.show();	
	install_livesearch_listener(new_box);

	return new_box;
}


function add_all_elements(button)
{
	// first find all the existing menu choices
	var all_elems = $('.search_element');
	var used_choices = new Array();
	all_elems.each(function(i)
	{
		var e = $(all_elems[i]);
		var c = e.find('.search_field_menu').val();
		used_choices[used_choices.length] = c;
	});
	
	var submitbutton = $('#submit_button');
	var only_new = $('#only_new');
	if (only_new.length > 0)
		insert_before = only_new;
	else
		insert_before = submitbutton;
		
	var parent_box = $(button).parents('.search_element');
	var menu_choices = parent_box.find('.search_field_menu')[0].options;
	for (i=0;i<menu_choices.length;i++)
	{
//	alert(i);
		var o = $(menu_choices[menu_choices.length - i - 1]);
		var c = o.text();
		var found = false;
		for (j=0;j<used_choices.length;j++)
		{
			if (used_choices[j] == c)
				found=true;
		}
		if (found == false) // used_choices.indexOf(c) == -1)
		{
			var new_box = parent_box.clone();
			new_box.find('.add_all_query_elements_button').remove();
			new_box.find('.remove_query_element_button').show();
			new_box.find('.search_element_options_pre, .search_element_options_post').hide();
			
			var s_op = new_box.find('.operator_menu');
			s_op.show();
			s_op.attr('name', "q_"+(element_counter));	
			s_op.attr('id', "q_"+(element_counter++));	
			var s_menu = new_box.find('.search_field_menu');
			s_menu.css('margin-left','0px');
			s_menu.selectOptions(c);
			s_menu.attr('name', "q_"+(element_counter));	
			s_menu.attr('id', "q_"+(element_counter++));	
			var s_val = new_box.find('.search_value');
			s_val.val("");
			s_val.attr('name', "q_"+(element_counter));	
			s_val.attr('id', "q_"+(element_counter++));	

			insert_before.before(new_box);
			load_search_element_options(new_box.find('.search_field_menu'), null, "");
			install_livesearch_listener(new_box);
		}
	}
}


function remove_element(button)
{
	var parent_box = $(button).parents('.search_element');
	parent_box.fadeOut("normal",function()	
	{
		parent_box.remove();
	});
}


function load_search_element_options(fieldmenu, opt, val)
{
	var parent_box = $(fieldmenu).parent('.search_element');
	var choice = $(fieldmenu).val();
	var options,hide_options;
	if (choice == 'Publication date')
	{
		options = parent_box.find('.search_element_options_pre');
		hide_options = parent_box.find('.search_element_options_post');
	}
	else
	{
		options = parent_box.find('.search_element_options_post');
		hide_options = parent_box.find('.search_element_options_pre');
	}
	
	// this part will load the options for the search. Stuff like "before/after/..." for date fields, or sub-choices like "all literature"
	var url = "searchfield_options.php?field="+choice+"&values="+opt+"&bib=IPBfull";
	$.get(url, function(xml)
	{
		if (xml != "no options")
		{	
			options.html(xml);
			options.show();
			hide_options.html("");
			hide_options.hide();
		}
		else
		{
			options.html("");
			options.hide();
			hide_options.html("");
			hide_options.hide();
		}
	});
	
	// this part loads the input value for the search : a popupmenu or a text input
	var box = parent_box.find('.search_elem_value_box');
	var box_id = box.attr('name');
	var url = "searchfield_inputvalue.php?field="+choice+"&val="+val+"&id="+box_id+"&bib=IPBfull";
	$.get(url, function(xml)
	{
		if (xml != "no options")
		{
			box[0].innerHTML = xml;
			var q = $('#'+box_id, box.parent());
			q.autocomplete("livesearch.php", {
						   		resultsClass:'livesearch_results',
						   		postUrl:attach_searchfield_choice,
						   		onFocus:searchfield_focus,
						   		cacheLength:0,
						   		quote_wrap:true
						   	});
		}
	});
}

function clear_form()
{
	var elems = $('#box_body').find('.search_element');
	for (i=1;i<elems.length;i++)
	{
		var elem = $(elems[i]);
		elem.slideUp("fast",function()
		{
			$(this).remove();
		});
	}
	
	var firstbox = $(elems.get(0));
	firstbox.find('input').val("");
	var m = $(firstbox.find('.search_field_menu')[0]);
	m.attr('selectedIndex',0);
	load_search_element_options(m, "", "");
}
	
function install_livesearch_listener(box)
{
	return "";
}

var current_livesearch_input = null;
function attach_livesearch(the_input)
{
	
	
/*
	current_livesearch_input = the_input;
	var live_div = $('#livesearch_div');
	if (current_livesearch_input == null)
		live_div.hide();
	else
	{	
		var o = current_livesearch_input.offset();
		var h = current_livesearch_input.outerHeight(); // this will need some finetuning
		$('#livesearch_div').css('left', o.left);
		$('#livesearch_div').css('top', o.top+h);
		live_div.show();
	}
	*/
}
	

$(window).resize(function()
{
	attach_livesearch(current_livesearch_input);
})