/* XMLHTTP状态显示字符 */
var xml_http_building_link = '建立连接';
var xml_http_sending = '发送命令';
var xml_http_loading = '接收回传';
var xml_http_data_in_processed = '处理数据';
var xml_http_load_failed = '服务器响应错,错误代码:[err:errcode]';

/* 浏览器判断 */
var userAgent = navigator.userAgent.toLowerCase();
var is_webtv = userAgent.indexOf('webtv') != -1;
var is_kon = userAgent.indexOf('konqueror') != -1;
var is_mac = userAgent.indexOf('mac') != -1;
var is_saf = userAgent.indexOf('applewebkit') != -1 || navigator.vendor == 'Apple Computer, Inc.';
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_moz = (navigator.product == 'Gecko' && !is_saf) && userAgent.substr(userAgent.indexOf('firefox') + 8, 3);
var is_ns = userAgent.indexOf('compatible') == -1 && userAgent.indexOf('mozilla') != -1 && !is_opera && !is_webtv && !is_saf;
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera && !is_saf && !is_webtv) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);

/* 基础函数 */
function $(id) {
    return document.getElementById(id);
}

function in_array(targetstr, sourcearry) {
    if (typeof sourcearry == 'string') {
        for (var i in sourcearry) {
            if (sourcearry[i] == targetstr)
            { return true; }
        }
    }
    return false;
}

function add2array(targetarry, newstr) {
    targetarry[targetarry.length] = newstr;
    return targetarry.length;
}

function del4array(targetarry, newstr) {
    for (i in targetarry) {
        if (targetarry[i] == newstr) {
            targetarry[i] = null;
        }
    }
    return targetarry;
}

var Ajaxs = new Array();
function AjaxRequest(recvType, targetId) {
    var ajax = new Object();
    ajax.targetId = targetId ? document.getElementById(targetId) : null;
    ajax.targetUrl = '';
    ajax.para = '';
    ajax.paratype = '';
    ajax.recvType = recvType ? recvType : 'XML';
    ajax.resultHandle = null;
    ajax.labelname = '';
    ajax.currentpage = '';
    ajax.sourcename = '';
    ajax.total = '';
    ajax.pagesize = '';

    ajax.createXMLHttpRequest = function () {
        var oXmlHttp = false;
        if (window.XMLHttpRequest) {
            oXmlHttp = new XMLHttpRequest();
            if (oXmlHttp.overrideMimeType) {
                oXmlHttp.overrideMimeType('text/xml');
            }
        } else if (window.ActiveXObject) {
            var xmlobjectarry = ["Microsoft.XMLHTTP", "MSXML.XMLHTTP", "Msxml2.XMLHTTP.7.0", "Msxml2.XMLHTTP.6.0", "Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP"];
            for (var i = 0; i < xmlobjectarry.length; i++) {
                try {
                    oXmlHttp = new ActiveXObject(xmlobjectarry[i]);
                    if (oXmlHttp) {
                        return oXmlHttpt;
                    }
                } catch (oError) { }
            }
        }
        return oXmlHttp;
    }
    ajax.XMLHttpRequest = ajax.createXMLHttpRequest();

    ajax.processHandle = function () {
        if (ajax.targetId) {
            ajax.targetId.style.display = '';
        }
        if (ajax.XMLHttpRequest.readyState == 1 && ajax.targetId) {
            ajax.targetId.innerHTML = xml_http_building_link;
        } else if (ajax.XMLHttpRequest.readyState == 2 && ajax.targetId) {
            ajax.targetId.innerHTML = xml_http_sending;
        } else if (ajax.XMLHttpRequest.readyState == 3 && ajax.targetId) {
            ajax.targetId.innerHTML = xml_http_loading;
        } else if (ajax.XMLHttpRequest.readyState == 4) {
            if (ajax.XMLHttpRequest.status == 200) {
                Ajaxs = del4array(Ajaxs, ajax.targetUrl);
                if (ajax.recvType == 'HTML') {
                    ajax.resultHandle(ajax.XMLHttpRequest.responseText);
                } else if (ajax.recvType == 'XML') {
                    if (window.XMLHttpRequest) {
                        ajax.resultHandle(ajax.XMLHttpRequest.responseText);
                    }
                    else {
                        ajax.resultHandle(ajax.XMLHttpRequest.responseXML);
                    }
                }
            } else {
                if (ajax.targetId) {
                    ajax.targetId.innerHTML = xml_http_load_failed.replace('[err:errcode]', ajax.XMLHttpRequest.status);
                }
            }
        }
    }

    ajax.createXmlDom = function (xmlstry) {
        var oXmlDom = false;
        if (is_ie) {
            var aVersions = ["Microsoft.XMLDOM", "MSXML2.DOMDocument.6.0", "MSXML2.DOMDocument.5.0", "Msxml2.DOMDocument.4.0", "MSXML2.DOMDocument.3.0", "MSXML2.DOMDocument"];
            for (var i = 0; i < aVersions.length; i++) {
                try {
                    oXmlDom = new ActiveXObject(aVersions[i]);
                    if (oXmlDom) {
                        break;
                    }
                }
                catch (oError) { }
            }
        }
        else {
            oXmlDom = document.implementation.createDocument("", "", null);
        }

        if (xmlstry != null) {
            oXmlDom.async = false;
            if (!is_ie) {
                var oParser = new DOMParser();
                oXmlDom = oParser.parseFromString(xmlstry, "text/xml");
            }
            else {
                if (is_ie == '7.0') {
                    oXmlDom.loadXML(xmlstry);
                }
                else {
                    if (window.XMLHttpRequest) {
                        oXmlDom.loadXML(xmlstry);
                    } else {
                        oXmlDom.load(xmlstry);
                    }
                }
            }
        }

        return oXmlDom;
    }

    ajax.get = function (targetUrl, resultHandle) {
        if (in_array(targetUrl, Ajaxs)) {
            return false;
        } else {
            add2array(Ajaxs, targetUrl);
        }
        ajax.targetUrl = targetUrl;
        ajax.XMLHttpRequest.onreadystatechange = ajax.processHandle;
        ajax.resultHandle = resultHandle;
        if (window.XMLHttpRequest) {
            ajax.XMLHttpRequest.open('GET', ajax.targetUrl);
            ajax.XMLHttpRequest.send(null);
        } else {
            ajax.XMLHttpRequest.open("GET", targetUrl, true);
            ajax.XMLHttpRequest.send();
        }
    }

    ajax.post = function (usemethod, targetUrl, resultHandle) {
        if (in_array(targetUrl, Ajaxs)) {
            return false;
        } else {
            add2array(Ajaxs, targetUrl);
        }
        ajax.targetUrl = targetUrl;

        var xml_dom = ajax.createXmlDom();
        xml_dom.async = false;

        if (!is_opera) /* opera不需要声明这一段 */
        {
            var xmlproperty = xml_dom.createProcessingInstruction("xml", "version=\"1.0\" encoding=\"utf-8\"");
            xml_dom.appendChild(xmlproperty);
        }

        var objRoot = xml_dom.createElement("root");

        var objField = xml_dom.createElement("type");
        var oText = xml_dom.createTextNode(usemethod);
        objField.appendChild(oText);
        objRoot.appendChild(objField);

        switch (usemethod) {
            case 'updatelabel':
                objField = xml_dom.createElement("labelname");
                oText = xml_dom.createTextNode(ajax.labelname);
                objField.appendChild(oText);
                objRoot.appendChild(objField);

                objField = xml_dom.createElement("currentpage");
                oText = xml_dom.createTextNode(ajax.currentpage);
                objField.appendChild(oText);
                objRoot.appendChild(objField);

                var objattrib;

                for (var i = 0; i < ajax.para.length; i++) {
                    objField = xml_dom.createElement("attrib");
                    if (i < ajax.paratype.length) {
                        switch (ajax.paratype[i]) {
                            case 'innerhtml':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode($(ajax.para[i]).innerHTML);
                                break;
                            case 'innertext':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode($(ajax.para[i]).innerText);
                                break;
                            case 'value':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode($(ajax.para[i]).value);
                                break;
                            case 'text':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode($(ajax.para[i]).Text);
                                break;
                            case 'select':
                                var optionCount = $(ajax.para[i]).length;
                                for (var m = 0; m < optionCount; m++) {
                                    var option = $(ajax.para[i]).options[m];
                                    if (option.selected) {
                                        oText = xml_dom.createTextNode(option.value);
                                    }
                                }
                                break;
                            case 'innerhtml.nohtml':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).innerHTML));
                                break;
                            case 'innertext.nohtml':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).innerText));
                                break;
                            case 'value.nohtml':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).value));
                                break;
                            case 'text.nohtml':
                                objattrib = xml_dom.createElement(ajax.para[i]);
                                oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).Text));
                                break;
                            default:
                                objattrib = xml_dom.createElement(ajax.para[i].split('=')[0]);
                                oText = xml_dom.createTextNode(ajax.para[i].split('=')[1]);
                                break;
                        }
                    }
                    else {
                        objattrib = xml_dom.createElement(ajax.para[i].split('=')[0]);
                        oText = xml_dom.createTextNode(ajax.para[i].split('=')[1]);
                    }

                    objattrib.appendChild(oText);
                    objField.appendChild(objattrib);
                    objRoot.appendChild(objField);
                }
                break;
            case 'updatepage':
                objField = xml_dom.createElement("labelname");
                oText = xml_dom.createTextNode(ajax.labelname);
                objField.appendChild(oText);
                objRoot.appendChild(objField);

                objField = xml_dom.createElement("sourcename");
                oText = xml_dom.createTextNode(ajax.sourcename);
                objField.appendChild(oText);
                objRoot.appendChild(objField);

                objField = xml_dom.createElement("currentpage");
                oText = xml_dom.createTextNode(ajax.currentpage);
                objField.appendChild(oText);
                objRoot.appendChild(objField);

                objField = xml_dom.createElement("total");
                oText = xml_dom.createTextNode(ajax.total);
                objField.appendChild(oText);
                objRoot.appendChild(objField);

                objField = xml_dom.createElement("pagesize");
                oText = xml_dom.createTextNode(ajax.pagesize);
                objField.appendChild(oText);
                objRoot.appendChild(objField);
                break;
            default:
                for (var i = 0; i < ajax.para.length; i++) {

                    if (ajax.para[i].indexOf('=') >= 0) {
                        objField = xml_dom.createElement(ajax.para[i].split('=')[0]);
                        oText = xml_dom.createTextNode(ajax.para[i].split('=')[1]);
                        objField.appendChild(oText);
                        objRoot.appendChild(objField);
                    }
                    else {
                        objField = xml_dom.createElement(ajax.para[i]);
                        if (i < ajax.paratype.length) {
                            if ($(ajax.para[i]) != null) {
                                switch (ajax.paratype[i]) {
                                    case 'innerhtml':
                                        oText = xml_dom.createTextNode($(ajax.para[i]).innerHTML);
                                        break;
                                    case 'innertext':
                                        oText = xml_dom.createTextNode($(ajax.para[i]).innerText);
                                        break;
                                    case 'text':
                                        oText = xml_dom.createTextNode($(ajax.para[i]).Text);
                                        break;
                                    case 'select':
                                        var optionCount = $(ajax.para[i]).length;
                                        for (var m = 0; m < optionCount; m++) {
                                            var option = $(ajax.para[i]).options[m];
                                            if (option.selected) {
                                                oText = xml_dom.createTextNode(option.value);
                                            }
                                        }
                                        break;
                                    case 'innerhtml.nohtml':
                                        oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).innerHTML));
                                        break;
                                    case 'innertext.nohtml':
                                        oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).innerText));
                                        break;
                                    case 'nohtml':
                                        oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).value));
                                        break;
                                    case 'text.nohtml':
                                        oText = xml_dom.createTextNode(removehtml($(ajax.para[i]).Text));
                                        break;
                                    default:
                                        oText = xml_dom.createTextNode($(ajax.para[i]).value);
                                        break;
                                }
                                objField.appendChild(oText);
                            }
                        }
                        else {
                            if ($(ajax.para[i]) != null) {
                                oText = xml_dom.createTextNode($(ajax.para[i]).value);
                                objField.appendChild(oText);
                            }
                        }
                        objRoot.appendChild(objField);
                    }

                }
                break;
        }
        xml_dom.appendChild(objRoot);

        ajax.XMLHttpRequest.onreadystatechange = ajax.processHandle;
        ajax.resultHandle = resultHandle;
        ajax.XMLHttpRequest.open('POST', targetUrl);
        ajax.XMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        ajax.XMLHttpRequest.send(xml_dom);
    }
    return ajax;
}