Removing mk related classes.
[pazpar2-moved-to-github.git] / js / pz2.js
index 0b2560b..cb19e78 100644 (file)
--- a/js/pz2.js
+++ b/js/pz2.js
@@ -1,5 +1,5 @@
 /*
-** $Id: pz2.js,v 1.33 2007-06-05 15:19:25 jakub Exp $
+** $Id: pz2.js,v 1.60 2007-10-02 10:33:18 jakub Exp $
 ** pz2.js - pazpar2's javascript client library.
 */
 
@@ -24,29 +24,30 @@ if (!window['Node']) {
 if(typeof window.pz2 == "undefined") {
 window.undefined = window.undefined;
 
-var pz2 = function(paramArray) {
+var pz2 = function ( paramArray )
+{
+    
+    // at least one callback required
+    if ( !paramArray )
+        throw new Error("Pz2.js: An array with parameters has to be suplied when instantiating a class");
+    
     //for convenience
     __myself = this;
 
     //supported pazpar2's protocol version
     __myself.suppProtoVer = '1';
-    __myself.pz2String = "search.pz2";
+    if (typeof paramArray.pazpar2path != "undefined")
+        __myself.pz2String = paramArray.pazpar2path;
+    else
+        __myself.pz2String = "/pazpar2/search.pz2";
+    __myself.useSessions = true;
+    
     __myself.stylesheet = paramArray.detailstylesheet || null;
-
     //load stylesheet if required in async mode
     if( __myself.stylesheet ) {
         var request = new pzHttpRequest( __myself.stylesheet );
-        request.get(
-                {},
-                function ( doc ) {
-                    __myself.xslDoc = doc;
-                }
-        );
+        request.get( {}, function ( doc ) { __myself.xslDoc = doc; } );
     }
-
-    // at least one callback required
-    if ( !paramArray )
-        throw new Error("An array with parameters has to be suplied when instantiating a class");
     
     __myself.errorHandler = paramArray.errorhandler || null;
     
@@ -63,23 +64,25 @@ var pz2 = function(paramArray) {
     
     // some configurational stuff
     __myself.keepAlive = 50000;
+    
+    if ( paramArray.keepAlive < __myself.keepAlive )
+        __myself.keepAlive = paramArray.keepAlive;
 
     __myself.sessionID = null;
     __myself.initStatusOK = false;
     __myself.pingStatusOK = false;
     __myself.searchStatusOK = false;
-
-    if ( paramArray.keepAlive < __myself.keepAlive )
-        __myself.keepAlive = paramArray.keepAlive;
-
+    
     // for sorting
     __myself.currentSort = "relevance";
+
     // where are we?
     __myself.currentStart = 0;
     __myself.currentNum = 20;
 
     // last full record retrieved
     __myself.currRecID = null;
+    
     // current query
     __myself.currQuery = null;
 
@@ -104,46 +107,76 @@ var pz2 = function(paramArray) {
     // active clients, updated by stat and show
     // might be an issue since bytarget will poll accordingly
     __myself.activeClients = 1;
-    
-    // auto init session?
-    if (paramArray.autoInit !== false)
+
+    // if in proxy mode no need to init
+    if (paramArray.usesessions != undefined) {
+         __myself.useSessions = paramArray.usesessions;
+        __myself.initStatusOK = true;
+    }
+    // else, auto init session or wait for a user init?
+    if (__myself.useSessions && paramArray.autoInit !== false) {
         __myself.init();
+    }
 };
-pz2.prototype = {
-    stop: function ()
-    {
-        clearTimeout(__myself.statTimer);
-        clearTimeout(__myself.showTimer);
-        clearTimeout(__myself.termTimer);
-        clearTimeout(__myself.bytargetTimer);
+
+pz2.prototype = 
+{
+    //error handler for async error throws
+   throwError: function (errMsg, errCode)
+   {
+        var err = new Error(errMsg);
+        if (errCode) err.code = errCode;
+                
+        if (__myself.errorHandler) {
+            __myself.errorHandler(err);
+        }
+        else {
+            throw err;
+        }
+   },
+
+    // stop activity by clearing tiemouts 
+   stop: function ()
+   {
+       clearTimeout(__myself.statTimer);
+       clearTimeout(__myself.showTimer);
+       clearTimeout(__myself.termTimer);
+       clearTimeout(__myself.bytargetTimer);
     },
+    
+    // reset status variables
     reset: function ()
-    {
-        __myself.sessionID = null;
-        __myself.initStatusOK = false;
-        __myself.pingStatusOK = false;
+    {   
+        if ( __myself.useSessions ) {
+            __myself.sessionID = null;
+            __myself.initStatusOK = false;
+            __myself.pingStatusOK = false;
+        }
         __myself.searchStatusOK = false;
-        
         __myself.stop();
-               
+            
         if ( __myself.resetCallback )
                 __myself.resetCallback();
     },
+
     init: function ( sessionId ) 
     {
         __myself.reset();
-        if ( sessionId != undefined ) {
+        
+        // session id as a param
+        if ( sessionId != undefined && __myself.useSessions ) {
             __myself.initStatusOK = true;
             __myself.sessionID = sessionId;
             __myself.ping();
-
-        } else {
+        // old school direct pazpar2 init
+        } else if (__myself.useSessions) {
             var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
             request.get(
                 { "command": "init" },
                 function(data) {
                     if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
-                        if ( data.getElementsByTagName("protocol")[0].childNodes[0].nodeValue != __myself.suppProtoVer )
+                        if ( data.getElementsByTagName("protocol")[0].childNodes[0].nodeValue 
+                            != __myself.suppProtoVer )
                             throw new Error("Server's protocol not supported by the client");
                         __myself.initStatusOK = true;
                         __myself.sessionID = data.getElementsByTagName("session")[0].childNodes[0].nodeValue;
@@ -152,17 +185,23 @@ pz2.prototype = {
                     else
                         // if it gets here the http return code was 200 (pz2 errors are 417)
                         // but the response was invalid, it should never occur
-                        setTimeout("__myself.init()", 1000);
+                        // setTimeout("__myself.init()", 1000);
+                        __myself.throwError('Init failed. Malformed WS resonse.', 110);
                 }
             );
-        }
+        // when through proxy no need to init
+        } else {
+            __myself.initStatusOK = true;
+       }
     },
     // no need to ping explicitly
     ping: function () 
     {
-        if( !__myself.initStatusOK )
-            return;
+        // pinging only makes sense when using pazpar2 directly
+        if( !__myself.initStatusOK || !__myself.useSessions )
+            throw new Error('Pz2.js: Ping not allowed (proxy mode) or session not initialized.');
             // session is not initialized code here
+        
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
         request.get(
             { "command": "ping", "session": __myself.sessionID },
@@ -174,11 +213,12 @@ pz2.prototype = {
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    setTimeout("__myself.ping()", 1000);
+                    // setTimeout("__myself.ping()", 1000);
+                    __myself.throwError('Ping failed. Malformed WS resonse.', 111);
             }
         );
     },
-    search: function (query, num, sort, filter)
+    search: function (query, num, sort, filter, showfrom)
     {
         clearTimeout(__myself.statTimer);
         clearTimeout(__myself.showTimer);
@@ -190,18 +230,25 @@ pz2.prototype = {
         __myself.bytargetCounter = 0;
         __myself.statCounter = 0;
         
+        // no proxy mode
         if( !__myself.initStatusOK )
-            return;
+            throw new Error('Pz2.js: session not initialized.');
         
         if( query !== undefined )
             __myself.currQuery = query;
         else
-            throw new Error("You need to supply query to the search command");
-
-        if( filter !== undefined )
-            var searchParams = { "command": "search", "session": __myself.sessionID, "query": __myself.currQuery, "filter": filter };
+            throw new Error("Pz2.js: no query supplied to the search command.");
+        
+        if ( showfrom !== undefined )
+            var start = showfrom;
         else
-            var searchParams = { "command": "search", "session": __myself.sessionID, "query": __myself.currQuery };
+            var start = 0;
+
+       var searchParams = { "command": "search", "query": __myself.currQuery, "session": __myself.sessionID };
+       
+        if (filter !== undefined)
+           searchParams["filter"] = filter;
+        
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
         request.get(
             searchParams,
@@ -209,7 +256,7 @@ pz2.prototype = {
                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
                     __myself.searchStatusOK = true;
                     //piggyback search
-                    __myself.show(0, num, sort);
+                    __myself.show(start, num, sort);
                     if ( __myself.statCallback )
                         __myself.stat();
                         //__myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
@@ -223,16 +270,19 @@ pz2.prototype = {
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    setTimeout("__myself.search(__myself.currQuery)", 500);
+                    // setTimeout("__myself.search(__myself.currQuery)", 500);
+                    __myself.throwError('Search failed. Malformed WS resonse.', 112);
             }
         );
     },
     stat: function()
     {
         if( !__myself.initStatusOK )
-            return;
+            throw new Error('Pz2.js: session not initialized.');
+        
         // if called explicitly takes precedence
         clearTimeout(__myself.statTimer);
+        
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
         request.get(
             { "command": "stat", "session": __myself.sessionID },
@@ -257,20 +307,21 @@ pz2.prototype = {
                    var delay = __myself.statTime + __myself.statCounter * __myself.dumpFactor;
                     if ( activeClients > 0 )
                         __myself.statTimer = setTimeout("__myself.stat()", delay);
-                    
                     __myself.statCallback(stat);
                 }
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    __myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
+                    //__myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
+                    __myself.throwError('Stat failed. Malformed WS resonse.', 113);
             }
         );
     },
     show: function(start, num, sort)
     {
-        if( !__myself.searchStatusOK )
-            return;
+        if( !__myself.searchStatusOK && __myself.useSessions )
+            throw new Error('Pz2.js: show command has to be preceded with a search command.');
+        
         // if called explicitly takes precedence
         clearTimeout(__myself.showTimer);
         
@@ -280,6 +331,7 @@ pz2.prototype = {
             __myself.currentStart = Number( start );
         if( num !== undefined )
             __myself.currentNum = Number( num );
+
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
         var context = this;
         request.get(
@@ -338,28 +390,64 @@ pz2.prototype = {
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    __myself.showTimer = setTimeout("__myself.show()", __myself.showTime / 4);
+                    // __myself.showTimer = setTimeout("__myself.show()", __myself.showTime / 4);
+                    __myself.throwError('Show failed. Malformed WS resonse.', 114);
             }
         );
     },
-    record: function(id)
+    record: function(id, offset, params)
     {
-        if( !__myself.searchStatusOK )
-            return;
+        // we may call record with no previous search if in proxy mode
+        if( !__myself.searchStatusOK && __myself.useSessions)
+           throw new Error('Pz2.js: record command has to be preceded with a search command.'); 
+
+        if ( params == undefined )
+            params = {};
+
+        if ( params.callback != undefined ) {
+            callback = params.callback;
+        } else {
+            callback = __myself.recordCallback;
+        }
+        
+        // what is that?
+        if ( params['handle'] == undefined )
+            handle = {};
+        else
+            handle = params['handle'];
 
         if( id !== undefined )
             __myself.currRecID = id;
+        
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
+
+       var recordParams = { "command": "record", 
+                            "session": __myself.sessionID,
+                            "id": __myself.currRecID };
+       
+        if (offset !== undefined) {
+           recordParams["offset"] = offset;
+       }
+
+        if (params.syntax != undefined) {
+            recordParams['syntax'] = params.syntax;
+        }
+
+       __myself.currRecOffset = offset;
+
         request.get(
-            { "command": "record", "session": __myself.sessionID, "id": __myself.currRecID },
+           recordParams,
             function(data) {
                 var recordNode;
                 var record = new Array();
-                if ( recordNode = data.getElementsByTagName("record")[0] ) {
+                record['xmlDoc'] = data;
+               if (__myself.currRecOffset !== undefined) {
+                    record['offset'] = __myself.currRecOffset;
+                    callback(record, handle);
+                } else if ( recordNode = data.getElementsByTagName("record")[0] ) {
                     // if stylesheet was fetched do not parse the response
                     if ( __myself.xslDoc ) {
                         record['recid'] = recordNode.getElementsByTagName("recid")[0].firstChild.nodeValue;
-                        record['xmlDoc'] = data;
                         record['xslDoc'] = __myself.xslDoc;
                     } else {
                         for ( i = 0; i < recordNode.childNodes.length; i++) {
@@ -391,24 +479,28 @@ pz2.prototype = {
                         }
                     }
                     
-                    __myself.recordCallback(record);
+                    callback(record, handle);
                 }
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    setTimeout("__myself.record(__myself.currRecID)", 500);
+                    // setTimeout("__myself.record(__myself.currRecID)", 500);
+                    __myself.throwError('Record failed. Malformed WS resonse.', 115);
             }
         );
     },
+
     termlist: function()
     {
-        if( !__myself.searchStatusOK )
-            return;
+        if( !__myself.searchStatusOK && __myself.useSessions )
+            throw new Error('Pz2.js: termlist command has to be preceded with a search command.');
+
         // if called explicitly takes precedence
         clearTimeout(__myself.termTimer);
+        
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
         request.get(
-            { "command": "termlist", "session": __myself.sessionID, "name": __myself.termKeys, "block": "1" },
+            { "command": "termlist", "session": __myself.sessionID, "name": __myself.termKeys },
             function(data) {
                 if ( data.getElementsByTagName("termlist") ) {
                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
@@ -447,17 +539,24 @@ pz2.prototype = {
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    __myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4); 
+                    // __myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4); 
+                    __myself.throwError('Termlist failed. Malformed WS resonse.', 116);
             }
         );
 
     },
     bytarget: function()
     {
+        if( !__myself.initStatusOK && __myself.useSessions )
+            throw new Error('Pz2.js: bytarget command has to be preceded with a search command.');
+        
+        // no need to continue
         if( !__myself.searchStatusOK )
             return;
+
         // if called explicitly takes precedence
         clearTimeout(__myself.bytargetTimer);
+        
         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
         request.get(
             { "command": "bytarget", "session": __myself.sessionID },
@@ -486,16 +585,19 @@ pz2.prototype = {
                 else
                     // if it gets here the http return code was 200 (pz2 errors are 417)
                     // but the response was invalid, it should never occur
-                    __myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
+                    // __myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
+                    __myself.throwError('Bytarget failed. Malformed WS resonse.', 117);
             }
         );
     },
+    
     // just for testing, probably shouldn't be here
     showNext: function(page)
     {
         var step = page || 1;
         __myself.show( ( step * __myself.currentNum ) + __myself.currentStart );     
     },
+
     showPrev: function(page)
     {
         if (__myself.currentStart == 0 )
@@ -504,6 +606,7 @@ pz2.prototype = {
         var newStart = __myself.currentStart - (step * __myself.currentNum );
         __myself.show( newStart > 0 ? newStart : 0 );
     },
+
     showPage: function(pageNum)
     {
         //var page = pageNum || 1;
@@ -520,6 +623,7 @@ var pzHttpRequest = function ( url, errorHandler ) {
         this.request = null;
         this.url = url;
         this.errorHandler = errorHandler || null;
+        this.async = true;
         
         if ( window.XMLHttpRequest ) {
             this.request = new XMLHttpRequest();
@@ -536,40 +640,64 @@ pzHttpRequest.prototype =
 {
     get: function ( params, callback ) 
     {
-        this.callback = callback;
-        
-        var getUrl = this.url;
-        var paramArr = new Array();
+        this._send( 'GET', params, '', callback );
+    },
 
-        for ( var key in params ) {
-            paramArr.push(key + '=' + encodeURI(params[key]) );
-        }
+    post: function ( params, data, callback )
+    {
+        this._send( 'POST', params, data, callback );
+    },
 
-        if ( paramArr.length )
-            getUrl += '?' + paramArr.join('&');
+    load: function ()
+    {
+        this.async = false;
+        this.request.open( 'GET', this.url, this.async );
+        this.request.send('');
+        if ( this.request.status == 200 )
+            return this.request.responseXML;
+    },
 
+    _send: function ( type, params, data, callback )
+    {
+        this.callback = callback;
         var context = this;
-        this.request.open( 'GET', getUrl, true );
-        this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
-        //this.request.setRequestHeader('Accept-Charset', 'UTF-8');
+        this.async = true;
+        this.request.open( type, this._urlAppendParams(params), this.async );
         this.request.onreadystatechange = function () {
             context._handleResponse();
         }
-        this.request.send(null);
+        this.request.send(data);
     },
 
-    _handleResponse: function ()
+    _urlAppendParams: function (params)
     {
-        if ( this.request.readyState == 4 ) {
-            if ( this.request.status == 200 ) {
-                this.callback( this.request.responseXML );
+        var getUrl = this.url;
+
+       var sep = '?';
+        var el = params;
+        for (var key in el) {
+            if (el[key] != null) {
+                getUrl += sep + key + '=' + encodeURIComponent(el[key]);
+                sep = '&';
             }
-            // pz errors
-            else if ( this.request.status == 417 ) {
-                var errMsg = this.request.responseXML.getElementsByTagName("error")[0].childNodes[0].nodeValue;
+        }
+        return getUrl;
+    },
+
+    _handleResponse: function ()
+    {
+        if ( this.request.readyState == 4 ) { 
+            // pick up pazpr2 errors first
+            if ( this.request.responseXML 
+                && this.request.responseXML.documentElement.nodeName == 'error'
+                && this.request.responseXML.getElementsByTagName("error").length ) {
+                var errAddInfo = '';
+                if ( this.request.responseXML.getElementsByTagName("error")[0].childNodes.length )
+                    errAddInfo = ': ' + this.request.responseXML.getElementsByTagName("error")[0].childNodes[0].nodeValue;
+                var errMsg = this.request.responseXML.getElementsByTagName("error")[0].getAttribute("msg");
                 var errCode = this.request.responseXML.getElementsByTagName("error")[0].getAttribute("code");
             
-                var err = new Error(errMsg);
+                var err = new Error(errMsg + errAddInfo);
                 err.code = errCode;
            
                 if (this.errorHandler) {
@@ -578,10 +706,11 @@ pzHttpRequest.prototype =
                 else {
                     throw err;
                 }
-            }
-            else {
-                var err = new Error("XMLHttpRequest error. STATUS: " 
-                            + this.request.status + " STATUS TEXT: " 
+            } else if ( this.request.status == 200 ) {
+                this.callback( this.request.responseXML );
+            } else {
+                var err = new Error("Pz2.js: HTTP request error (AJAX). Code: " 
+                            + this.request.status + " Info: " 
                             + this.request.statusText );
                 err.code = 'HTTP';
                 
@@ -598,148 +727,124 @@ pzHttpRequest.prototype =
 
 /*
 *********************************************************************************
-** QUERY CLASS ******************************************************************
+** XML HELPER CLASS ************************************************************
 *********************************************************************************
 */
-var pzQuery = function()
+
+// DOMDocument
+
+if ( window.ActiveXObject) {
+    var DOMDoc = document;
+} else {
+    var DOMDoc = Document.prototype;
+}
+
+DOMDoc.newXmlDoc = function ( root )
 {
-    this.simpleQuery = '';
-    this.singleFilter = null;
-    this.advTerms = new Array();
-    this.filterHash = new Array();
-    this.numTerms = 0;
-    this.filterNums = 0;
-};
-pzQuery.prototype = {
-    clearSimpleQuery: function()
-    {
-        this.simpleQuery = '';
-    },
-    reset: function()
-    {
-        this.simpleQuery = '';
-        this.advTerms = new Array();
-        this.simpleFilter = null;
-        this.numTerms = 0;
-    },
-    addTerm: function(field, value)
-    {
-        var term = {"field": field, "value": value};
-        this.advTerms[this.numTerms] = term;
-        this.numTerms++;
-    },
-    getTermValueByIdx: function(index)
-    {
-        return this.advTerms[index].value;
-    },
-    getTermFieldByIdx: function(index)
-    {
-        return this.advTerms[index].field;
-    },
-    /* semicolon separated list of terms for given field*/
-    getTermsByField: function(field)
-    {
-        var terms = '';
-        for(var i = 0; i < this.advTerms.length; i++)
-        {
-            if( this.advTerms[i].field == field )
-                terms = terms + this.queryHas[i].value + ';';
-        }
-        return terms;
-    },
-    addTermsFromList: function(inputString, field)
-    {
-        var inputArr = inputString.split(';');
-        for(var i=0; i < inputArr.length; i++)
-        {
-            if(inputArr[i].length < 3) continue;
-            this.advTerms[this.numTerms] = {"field": field, "value": inputArr[i] };
-            this.numTerms++;
-        }
-    },
-    removeTermByIdx: function(index)
-    {
-        this.advTerms.splice(index, 1);
-        this.numTerms--;
-    },
-    toCCL: function()
-    {   
-        var ccl = '';
-        if( this.simpleQuery != '')
-            ccl = this.simpleQuery;
-        for(var i = 0; i < this.advTerms.length; i++)
-        {
-            if (ccl != '') ccl = ccl + ' and ';
-            ccl = ccl + this.advTerms[i].field+'="'+this.advTerms[i].value+'"';
-        }
-        return ccl;
-    },
-    addFilter: function(name, value)
-    {
-        var filter = {"name": name, "id": value };
-        this.filterHash[this.filterHash.length] = filter;
-        this.filterNums++
-        return  this.filterHash.length - 1;
-    },
-    setFilter: function(name, value)
-    {
-        this.filterHash = new Array();
-        this.filterNums = 0;
-        this.addFilter(name, value);
-    },
-    getFilter: function(index)
-    {
-        return this.filterHash[index].id;
-    },
-    getFilterName: function(index)
-    {
-        return this.filterHash[index].name;
-    },
-    removeFilter: function(index)
-    {
-        delete this.filterHash[index];
-        this.filterNums--;
-    },
-    clearFilter: function()
-    {
-        this.filterHash = new Array();
-        this.filterNums = 0;
-    },
-    getFilterString: function()
-    {
-        //temporary
-        if( this.singleFilter != null ) {
-            return 'pz:id='+this.singleFilter.id;
-        } 
-        else if( this.filterNums <= 0 ) {
-            return undefined;
-        }
+    var doc;
+
+    if (document.implementation && document.implementation.createDocument) {
+        doc = document.implementation.createDocument('', root, null);
+    } else if ( window.ActiveXObject ) {
+        doc = new ActiveXObject("MSXML2.DOMDocument");
+        doc.loadXML('<' + root + '/>');
+    } else {
+        throw new Error ('No XML support in this browser');
+    }
 
-        var filter = 'pz:id=';
-        for(var i = 0; i < this.filterHash.length; i++)
-        {
-            if (this.filterHash[i] == undefined) continue;
-            if (filter > 'pz:id=') filter = filter + '|';            
-            filter += this.filterHash[i].id; 
-        }
-        return filter;
-    },
-    totalLength: function()
-    {
-        var simpleLength = this.simpleQuery != '' ? 1 : 0;
-        return this.advTerms.length + simpleLength;
-    },
-    clearSingleFilter: function()
-    {
-        this.singleFilter = null;
-    },
-    setSingleFilter: function(name, value)
-    {
-        this.singleFilter = {"name": name, "id": value };
-    },
-    getSingleFilterName: function()
-    {
-        return this.singleFilter.name;
+    return doc;
+}
+
+   
+DOMDoc.parseXmlFromString = function ( xmlString ) 
+{
+    var doc;
+
+    if ( window.DOMParser ) {
+        var parser = new DOMParser();
+        doc = parser.parseFromString( xmlString, "text/xml");
+    } else if ( window.ActiveXObject ) {
+        doc = new ActiveXObject("MSXML2.DOMDocument");
+        doc.loadXML( xmlString );
+    } else {
+        throw new Error ("No XML parsing support in this browser.");
+    }
+
+    return doc;
+}
+
+DOMDoc.transformToDoc = function (xmlDoc, xslDoc)
+{
+    if ( window.XSLTProcessor ) {
+        var proc = new XSLTProcessor();
+        proc.importStylesheet( xslDoc );
+        return proc.transformToDocument(xmlDoc);
+    } else if ( window.ActiveXObject ) {
+        return document.parseXmlFromString(xmlDoc.transformNode(xslDoc));
+    } else {
+        alert( 'Unable to perform XSLT transformation in this browser' );
+    }
+}
+// DOMElement
+
+Element_removeFromDoc = function (DOM_Element)
+{
+    DOM_Element.parentNode.removeChild(DOM_Element);
+}
+
+Element_emptyChildren = function (DOM_Element)
+{
+    while( DOM_Element.firstChild ) {
+        DOM_Element.removeChild( DOM_Element.firstChild )
+    }
+}
+
+Element_appendTransformResult = function ( DOM_Element, xmlDoc, xslDoc )
+{
+    if ( window.XSLTProcessor ) {
+        var proc = new XSLTProcessor();
+        proc.importStylesheet( xslDoc );
+        var docFrag = false;
+        docFrag = proc.transformToFragment( xmlDoc, DOM_Element.ownerDocument );
+        DOM_Element.appendChild(docFrag);
+    } else if ( window.ActiveXObject ) {
+        DOM_Element.innerHTML = xmlDoc.transformNode( xslDoc );
+    } else {
+        alert( 'Unable to perform XSLT transformation in this browser' );
+    }
+}
+Element_appendTextNode = function (DOM_Element, tagName, textContent )
+{
+    var node = DOM_Element.ownerDocument.createElement(tagName);
+    var text = DOM_Element.ownerDocument.createTextNode(textContent);
+
+    DOM_Element.appendChild(node);
+    node.appendChild(text);
+
+    return node;
+}
+
+Element_setTextContent = function ( DOM_Element, textContent )
+{
+    if (typeof DOM_Element.textContent !== "undefined") {
+        DOM_Element.textContent = textContent;
+    } else if (typeof DOM_Element.innerText !== "undefined" ) {
+        DOM_Element.innerText = textContent;
+    } else {
+        throw new Error("Cannot set text content of the node, no such method.");
+    }
+}
+
+Element_getTextContent = function (DOM_Element)
+{
+    if ( typeof DOM_Element.textContent != 'undefined' ) {
+        return DOM_Element.textContent;
+    } else if (typeof DOM_Element.text != 'undefined') {
+        return DOM_Element.text;
+    } else {
+        throw new Error("Cannot get text content of the node, no such method.");
     }
 }