// JavaScript Document
//AJAX
//Cristian Medina


function getxmlHttpRequest(obj) {
    if (window.XMLHttpRequest) {
        obj = new XMLHttpRequest();
        if (obj.overrideMimeType) {
            obj.overrideMimeType("text/xml");
        }
    }
    else if (window.ActiveXObject) {
        try {
            obj = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            try {
                obj = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e) { }
        }
    }
    return obj;
}


function executaAjax(xmlHttp, url, metodo, parametros, acao) {

    if ((xmlHttp != null) || (xmlHttp != undefined)) {
        xmlHttp.onreadystatechange = function() {
            if (xmlHttp.readyState == 4) {
                if (xmlHttp.status == 200) {
                    acao();
                }
                else {
                    alert('Ocorreu um erro.');
                }
            }
        }

        xmlHttp.open(metodo, url, true);
        if (metodo == 'POST') {
            xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=ISO-8859-1");
            xmlHttp.setRequestHeader("Content-length", parametros.length);
            //				xmlHttp.setRequestHeader("Connection", "close");			
        }
        xmlHttp.send(parametros);
    }
}

function execAjax(xmlHttp, url, metodo, parametros, callback) {

    if ((xmlHttp != null) || (xmlHttp != undefined)) {
        xmlHttp.onreadystatechange = function() {
            if (xmlHttp.readyState == 4) {
                if (xmlHttp.status == 200) {
                    callback(xmlHttp);
                }
                else {
                    alert('Ocorreu um erro.');
                }
            }
        }

        xmlHttp.open(metodo, url, true);
        if (metodo == 'POST') {
            xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            xmlHttp.setRequestHeader("Content-length", parametros.length);
        }
        xmlHttp.send(parametros);
    }
}

function createXMLHTTP() {
    var ajax;
    try {
        ajax = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (e) {
        try {
            ajax = new ActiveXObject("Msxml2.XMLHTTP");
            alert(ajax);
        }
        catch (ex) {
            try {
                ajax = new XMLHttpRequest();
            }
            catch (exc) {
                alert("Esse browser não tem recursos para uso do Ajax");
                ajax = null;
            }
        }
        return ajax;
    }

    var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
           "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
           "Microsoft.XMLHTTP"];
    for (var i = 0; i < arrSignatures.length; i++) {
        try {
            var oRequest = new ActiveXObject(arrSignatures[i]);
            return oRequest;
        }
        catch (oError) {
        }
    }

    throw new Error("MSXML is not installed on your system.");
}



function serializeForm(form) {

    // Return value
    var retVal = '';

    // Getting ALL elements inside of form element
    var els = form.getElementsByTagName('*');

    // Looping through all elements inside of form and checking to see if they're "form elements"
    for (var idx = 0; idx < els.length; idx++) {
        var el = els[idx];

        // According to the HTTP/HTML specs we shouldn't serialize disabled controls
        // Notice also that according to the HTTP/HTML standards we should also serialize the
        // name/value pair meaning that the name attribute are being used as the ID of the control
        // Though for Ra controls the name attribute will have the same value as the ID attribute
        if (!el.disabled && el.name && el.name.length > 0) {
            switch (el.tagName.toLowerCase()) {
                case 'input':
                    switch (el.type) {
                        // Note we SKIP Buttons and Submits since there are no reasons as to why we    
                        // should submit those anyway   
                        case 'checkbox':
                        case 'radio':
                            if (el.checked) {
                                if (retVal.length > 0) {
                                    retVal += '&';
                                }
                                retVal += el.name + '=' + escape(el.value);
                            }
                            break;
                        case 'hidden':
                        case 'password':
                        case 'text':
                            if (retVal.length > 0) {
                                retVal += '&';
                            }
                            retVal += el.name + '=' + escape(el.value);
                            break;
                    }
                    break;
                case 'select':
                case 'textarea':
                    if (retVal.length > 0) {
                        retVal += '&';
                    }
                    retVal += el.name + '=' + escape(el.value);
                    break;
            }
        }
    }
    return retVal;
}

/* standard small functions */
function $m(quem) {
    return document.getElementById(quem)
}
function remove(quem) {
    quem.parentNode.removeChild(quem);
}
function addEvent(obj, evType, fn) {
    // elcio.com.br/crossbrowser
    if (obj.addEventListener)
        obj.addEventListener(evType, fn, true)
    if (obj.attachEvent)
        obj.attachEvent("on" + evType, fn)
}
function removeEvent(obj, type, fn) {
    if (obj.detachEvent) {
        obj.detachEvent('on' + type, fn);
    } else {
        obj.removeEventListener(type, fn, false);
    }
}


function ajaxUpload(form, url_action, callback) {
    //testing if 'form' is a html object or a id string
    form = typeof (form) == "string" ? $m(form) : form;

    var erro = "";
    if (form == null || typeof (form) == "undefined") { erro += "The form of 1st parameter does not exists.\n"; }
    else if (form.nodeName.toLowerCase() != "form") { erro += "The form of 1st parameter its not a form.\n"; }

    if (erro.length > 0) {
        alert("Error in call ajaxUpload:\n" + erro);
        return;
    }

    //Criando o Iframe
    var iframe = document.createElement("iframe");
    iframe.setAttribute("id", "ajax-temp");
    iframe.setAttribute("name", "ajax-temp");
    iframe.setAttribute("width", "0");
    iframe.setAttribute("height", "0");
    iframe.setAttribute("border", "0");
    iframe.setAttribute("style", "width: 0; height: 0; border: none;");

    //Adiciona ao documento
    form.parentNode.appendChild(iframe);
    window.frames['ajax-temp'].name = "ajax-temp"; //ie sucks

    //add Eventos
    var carregou = function() {
        removeEvent($m('ajax-temp'), "load", carregou);
        var cross = "javascript: ";
        cross += "window.parent." + callback + "(document.body.innerHTML); void(0); ";

        $m('ajax-temp').src = cross;
        //deleta o iframe
        setTimeout(function() { remove($m('ajax-temp')) }, 250);
    }
    addEvent($m('ajax-temp'), "load", carregou)

    //propriedades do form
    form.setAttribute("target", "ajax-temp");
    form.setAttribute("action", url_action);
    form.setAttribute("method", "post");
    form.setAttribute("enctype", "multipart/form-data");
    form.setAttribute("encoding", "multipart/form-data");
    //submit
    form.submit();

}