var mySearchBaseURL = 'http://www.avui.cat' + '/client/avui_cat/components/cercador/behaviour/';

function getCategories(idSelectPublicacio, idSelectCategoria, indexPublicacioSelect) {

	var publicacio = getSelectedValue(idSelectPublicacio, indexPublicacioSelect);
	var mySearchEncoding = 'iso-8859-1';
	var myParams = 'publicacio=' + publicacio;
	var myURL = mySearchBaseURL + 'categoriaCerca.php';

	var myAjax = new Ajax.Request(myURL, {
		method :'get',
		encoding :mySearchEncoding,
		parameters :myParams,
		onComplete : function(transport) {
			if (200 == transport.status) {
				changeCategoriaContent(transport.responseXML,
						idSelectCategoria, publicacio);
			}
		}
	});
}

function changeCategoriaContent(xml, idSelectCategoria, publicacio) {
	var xmlDoc = xml.documentElement;
	var xmlOptions = xmlDoc.getElementsByTagName("option");

	removeEverythingSelect(idSelectCategoria);

	for (i = 0; i < xmlOptions.length; i++) {
		var selectValue = xmlOptions[i].attributes[0].nodeValue; // id
																	// categoria
		var selectText = xmlOptions[i].childNodes[0].nodeValue; // Nom categoria
		addSelect(idSelectCategoria, selectValue, selectText);
	}

	enableDisableCategoria(idSelectCategoria, publicacio);
}

function getSelectedValue(idSelect, indexSelect) {
	var mySelect = $(idSelect);
	return mySelect.getElementsByTagName("option")[indexSelect].value;
}

function removeEverythingSelect(idSelect) {
	var mySelect = $(idSelect);
	while (mySelect.length != 0) {
		for (i = 0; i < mySelect.length; i++) {
			mySelect.remove(mySelect[i]);
		}
	}
}

function addSelect(idSelect, valueSelect, textSelect) {

	var option = new Element('option', {
		value :valueSelect
	}).update(textSelect);

	try {
		$(idSelect).add(option, null);
	}

	catch (ex) // IE
	{
		var IEoption = document.createElement('option');
		IEoption.value = valueSelect;
		IEoption.text = textSelect;
		$(idSelect).add(IEoption);
	}
}

function enableDisableCategoria(idSelectCategoria, publicacio) {

	if (publicacio == 'publicacions')
		$(idSelectCategoria).disabled = true;
	else
		$(idSelectCategoria).disabled = false;
}