experiments/spdemo/pz2.js

   1 /*
   2  * $Id: 3a9980787bb5d0fe966140b243a4a5eb6768913e $
   3 ** pz2.js - pazpar2's javascript client library.
   4 */
   5
   6 //since explorer is flawed
   7 if (!window['Node']) {
   8     window.Node = new Object();
   9     Node.ELEMENT_NODE = 1;
  10     Node.ATTRIBUTE_NODE = 2;
  11     Node.TEXT_NODE = 3;
  12     Node.CDATA_SECTION_NODE = 4;
  13     Node.ENTITY_REFERENCE_NODE = 5;
  14     Node.ENTITY_NODE = 6;
  15     Node.PROCESSING_INSTRUCTION_NODE = 7;
  16     Node.COMMENT_NODE = 8;
  17     Node.DOCUMENT_NODE = 9;
  18     Node.DOCUMENT_TYPE_NODE = 10;
  19     Node.DOCUMENT_FRAGMENT_NODE = 11;
  20     Node.NOTATION_NODE = 12;
  21 }
  22
  23 // prevent execution of more than once
  24 if(typeof window.pz2 == "undefined") {
  25 window.undefined = window.undefined;
  26
  27 var pz2 = function ( paramArray )
  28 {
  29
  30     // at least one callback required
  31     if ( !paramArray )
  32         throw new Error("Pz2.js: Array with parameters has to be supplied.");
  33
  34     //supported pazpar2's protocol version
  35     this.suppProtoVer = '1';
  36     if (typeof paramArray.pazpar2path != "undefined")
  37         this.pz2String = paramArray.pazpar2path;
  38     else
  39         this.pz2String = "/pazpar2/search.pz2";
  40     this.useSessions = true;
  41
  42     this.stylesheet = paramArray.detailstylesheet || null;
  43     //load stylesheet if required in async mode
  44     if( this.stylesheet ) {
  45         var context = this;
  46         var request = new pzHttpRequest( this.stylesheet );
  47         request.get( {}, function ( doc ) { context.xslDoc = doc; } );
  48     }
  49
  50     this.errorHandler = paramArray.errorhandler || null;
  51     this.showResponseType = paramArray.showResponseType || "xml";
  52
  53     // function callbacks
  54     this.initCallback = paramArray.oninit || null;
  55     this.statCallback = paramArray.onstat || null;
  56     this.showCallback = paramArray.onshow || null;
  57     this.termlistCallback = paramArray.onterm || null;
  58     this.recordCallback = paramArray.onrecord || null;
  59     this.bytargetCallback = paramArray.onbytarget || null;
  60     this.resetCallback = paramArray.onreset || null;
  61
  62     // termlist keys
  63     this.termKeys = paramArray.termlist || "subject";
  64
  65     // some configurational stuff
  66     this.keepAlive = 50000;
  67
  68     if ( paramArray.keepAlive < this.keepAlive )
  69         this.keepAlive = paramArray.keepAlive;
  70
  71     this.sessionID = null;
  72     this.serviceId = paramArray.serviceId || null;
  73     this.initStatusOK = false;
  74     this.pingStatusOK = false;
  75     this.searchStatusOK = false;
  76
  77     // for sorting
  78     this.currentSort = "relevance";
  79
  80     // where are we?
  81     this.currentStart = 0;
  82     // currentNum can be overwritten in show
  83     this.currentNum = 20;
  84
  85     // last full record retrieved
  86     this.currRecID = null;
  87
  88     // current query
  89     this.currQuery = null;
  90
  91     //current raw record offset
  92     this.currRecOffset = null;
  93
  94     //timers
  95     this.pingTimer = null;
  96     this.statTime = paramArray.stattime || 1000;
  97     this.statTimer = null;
  98     this.termTime = paramArray.termtime || 1000;
  99     this.termTimer = null;
 100     this.showTime = paramArray.showtime || 1000;
 101     this.showTimer = null;
 102     this.showFastCount = 4;
 103     this.bytargetTime = paramArray.bytargettime || 1000;
 104     this.bytargetTimer = null;
 105     this.recordTime = paramArray.recordtime || 500;
 106     this.recordTimer = null;
 107
 108     // counters for each command and applied delay
 109     this.dumpFactor = 500;
 110     this.showCounter = 0;
 111     this.termCounter = 0;
 112     this.statCounter = 0;
 113     this.bytargetCounter = 0;
 114     this.recordCounter = 0;
 115
 116     // active clients, updated by stat and show
 117     // might be an issue since bytarget will poll accordingly
 118     this.activeClients = 1;
 119
 120     // if in proxy mode no need to init
 121     if (paramArray.usesessions != undefined) {
 122          this.useSessions = paramArray.usesessions;
 123         this.initStatusOK = true;
 124     }
 125     // else, auto init session or wait for a user init?
 126     if (this.useSessions && paramArray.autoInit !== false) {
 127         this.init(this.sessionID, this.serviceId);
 128     }
 129     // Version parameter
 130     this.version = paramArray.version || null;
 131 };
 132
 133 pz2.prototype =
 134 {
 135     //error handler for async error throws
 136    throwError: function (errMsg, errCode)
 137    {
 138         var err = new Error(errMsg);
 139         if (errCode) err.code = errCode;
 140
 141         if (this.errorHandler) {
 142             this.errorHandler(err);
 143         }
 144         else {
 145             throw err;
 146         }
 147    },
 148
 149     // stop activity by clearing tiemouts
 150    stop: function ()
 151    {
 152        clearTimeout(this.statTimer);
 153        clearTimeout(this.showTimer);
 154        clearTimeout(this.termTimer);
 155        clearTimeout(this.bytargetTimer);
 156     },
 157
 158     // reset status variables
 159     reset: function ()
 160     {
 161         if ( this.useSessions ) {
 162             this.sessionID = null;
 163             this.initStatusOK = false;
 164             this.pingStatusOK = false;
 165             clearTimeout(this.pingTimer);
 166         }
 167         this.searchStatusOK = false;
 168         this.stop();
 169
 170         if ( this.resetCallback )
 171                 this.resetCallback();
 172     },
 173
 174     init: function (sessionId, serviceId)
 175     {
 176         this.reset();
 177
 178         // session id as a param
 179         if (sessionId && this.useSessions ) {
 180             this.initStatusOK = true;
 181             this.sessionID = sessionId;
 182             this.ping();
 183         // old school direct pazpar2 init
 184         } else if (this.useSessions) {
 185             var context = this;
 186             var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 187             var opts = {'command' : 'init'};
 188             if (serviceId) opts.service = serviceId;
 189             request.safeGet(
 190                 opts,
 191                 function(data) {
 192                     if ( data.getElementsByTagName("status")[0]
 193                             .childNodes[0].nodeValue == "OK" ) {
 194                         if ( data.getElementsByTagName("protocol")[0]
 195                                 .childNodes[0].nodeValue
 196                             != context.suppProtoVer )
 197                             throw new Error(
 198                                 "Server's protocol not supported by the client"
 199                             );
 200                         context.initStatusOK = true;
 201                         context.sessionID =
 202                             data.getElementsByTagName("session")[0]
 203                                 .childNodes[0].nodeValue;
 204                         if (data.getElementsByTagName("keepAlive").length > 0) {
 205                             context.keepAlive = data.getElementsByTagName("keepAlive")[0].childNodes[0].nodeValue;
 206                         }
 207                         context.pingTimer =
 208                             setTimeout(
 209                                 function () {
 210                                     context.ping();
 211                                 },
 212                                 context.keepAlive
 213                             );
 214                         if ( context.initCallback )
 215                             context.initCallback();
 216                     }
 217                     else
 218                         context.throwError('Init failed. Malformed WS resonse.',
 219                                             110);
 220                 }
 221             );
 222         // when through proxy no need to init
 223         } else {
 224             this.initStatusOK = true;
 225         }
 226     },
 227     // no need to ping explicitly
 228     ping: function ()
 229     {
 230         // pinging only makes sense when using pazpar2 directly
 231         if( !this.initStatusOK || !this.useSessions )
 232             throw new Error(
 233             'Pz2.js: Ping not allowed (proxy mode) or session not initialized.'
 234             );
 235         var context = this;
 236
 237         clearTimeout(context.pingTimer);
 238
 239         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 240         request.safeGet(
 241             { "command": "ping", "session": this.sessionID, "windowid" : window.name },
 242             function(data) {
 243                 if ( data.getElementsByTagName("status")[0]
 244                         .childNodes[0].nodeValue == "OK" ) {
 245                     context.pingStatusOK = true;
 246                     context.pingTimer =
 247                         setTimeout(
 248                             function () {
 249                                 context.ping();
 250                             },
 251                             context.keepAlive
 252                         );
 253                 }
 254                 else
 255                     context.throwError('Ping failed. Malformed WS resonse.',
 256                                         111);
 257             }
 258         );
 259     },
 260     search: function (query, num, sort, filter, showfrom, addParamsArr)
 261     {
 262         clearTimeout(this.statTimer);
 263         clearTimeout(this.showTimer);
 264         clearTimeout(this.termTimer);
 265         clearTimeout(this.bytargetTimer);
 266
 267         this.showCounter = 0;
 268         this.termCounter = 0;
 269         this.bytargetCounter = 0;
 270         this.statCounter = 0;
 271         this.activeClients = 1;
 272
 273         // no proxy mode
 274         if( !this.initStatusOK )
 275             throw new Error('Pz2.js: session not initialized.');
 276
 277         if( query !== undefined )
 278             this.currQuery = query;
 279         else
 280             throw new Error("Pz2.js: no query supplied to the search command.");
 281
 282         if ( showfrom !== undefined )
 283             var start = showfrom;
 284         else
 285             var start = 0;
 286
 287         var searchParams = {
 288           "command": "search",
 289           "query": this.currQuery,
 290           "session": this.sessionID,
 291           "windowid" : window.name
 292         };
 293
 294         if( sort !== undefined ) {
 295             this.currentSort = sort;
 296             searchParams["sort"] = sort;
 297         }
 298         if (filter !== undefined)
 299                 searchParams["filter"] = filter;
 300
 301         // copy additional parmeters, do not overwrite
 302         if (addParamsArr != undefined) {
 303             for (var prop in addParamsArr) {
 304                 if (!searchParams.hasOwnProperty(prop))
 305                     searchParams[prop] = addParamsArr[prop];
 306             }
 307         }
 308
 309         var context = this;
 310         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 311         request.safeGet(
 312             searchParams,
 313             function(data) {
 314                 if ( data.getElementsByTagName("status")[0]
 315                         .childNodes[0].nodeValue == "OK" ) {
 316                     context.searchStatusOK = true;
 317                     //piggyback search
 318                     context.show(start, num, sort);
 319                     if (context.statCallback)
 320                         context.stat();
 321                     if (context.termlistCallback)
 322                         context.termlist();
 323                     if (context.bytargetCallback)
 324                         context.bytarget();
 325                 }
 326                 else
 327                     context.throwError('Search failed. Malformed WS resonse.',
 328                                         112);
 329             }
 330         );
 331     },
 332     stat: function()
 333     {
 334         if( !this.initStatusOK )
 335             throw new Error('Pz2.js: session not initialized.');
 336
 337         // if called explicitly takes precedence
 338         clearTimeout(this.statTimer);
 339
 340         var context = this;
 341         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 342         request.safeGet(
 343             { "command": "stat", "session": this.sessionID, "windowid" : window.name },
 344             function(data) {
 345                 if ( data.getElementsByTagName("stat") ) {
 346                     var activeClients =
 347                         Number( data.getElementsByTagName("activeclients")[0]
 348                                     .childNodes[0].nodeValue );
 349                     context.activeClients = activeClients;
 350
 351                     var stat = Element_parseChildNodes(data.documentElement);
 352
 353                     context.statCounter++;
 354                     var delay = context.statTime
 355                         + context.statCounter * context.dumpFactor;
 356
 357                     if ( activeClients > 0 )
 358                         context.statTimer =
 359                             setTimeout(
 360                                 function () {
 361                                     context.stat();
 362                                 },
 363                                 delay
 364                             );
 365                     context.statCallback(stat);
 366                 }
 367                 else
 368                     context.throwError('Stat failed. Malformed WS resonse.',
 369                                         113);
 370             }
 371         );
 372     },
 373     show: function(start, num, sort, query_state)
 374     {
 375         if( !this.searchStatusOK && this.useSessions )
 376             throw new Error(
 377                 'Pz2.js: show command has to be preceded with a search command.'
 378             );
 379
 380         // if called explicitly takes precedence
 381         clearTimeout(this.showTimer);
 382
 383         if( sort !== undefined )
 384             this.currentSort = sort;
 385         if( start !== undefined )
 386             this.currentStart = Number( start );
 387         if( num !== undefined )
 388             this.currentNum = Number( num );
 389
 390         var context = this;
 391         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 392         var requestParameters =
 393           {
 394               "command": "show",
 395               "session": this.sessionID,
 396               "start": this.currentStart,
 397               "num": this.currentNum,
 398               "sort": this.currentSort,
 399               "block": 1,
 400               "type": this.showResponseType,
 401               "windowid" : window.name
 402           };
 403         if (query_state)
 404           requestParameters["query-state"] = query_state;
 405         if (this.version && this.version > 0)
 406             requestParameters["version"] = this.version;
 407         request.safeGet(
 408           requestParameters,
 409           function(data, type) {
 410             var show = null;
 411             var activeClients = 0;
 412             if (type === "json") {
 413               show = {};
 414               activeClients = Number(data.activeclients[0]);
 415               show.activeclients = activeClients;
 416               show.merged = Number(data.merged[0]);
 417               show.total = Number(data.total[0]);
 418               show.start = Number(data.start[0]);
 419               show.num = Number(data.num[0]);
 420               show.hits = data.hit;
 421             } else if (data.getElementsByTagName("status")[0]
 422                   .childNodes[0].nodeValue == "OK") {
 423                 // first parse the status data send along with records
 424                 // this is strictly bound to the format
 425                 activeClients =
 426                   Number(data.getElementsByTagName("activeclients")[0]
 427                       .childNodes[0].nodeValue);
 428                 show = {
 429                   "activeclients": activeClients,
 430                   "merged":
 431                     Number( data.getElementsByTagName("merged")[0]
 432                         .childNodes[0].nodeValue ),
 433                   "total":
 434                     Number( data.getElementsByTagName("total")[0]
 435                         .childNodes[0].nodeValue ),
 436                   "start":
 437                     Number( data.getElementsByTagName("start")[0]
 438                         .childNodes[0].nodeValue ),
 439                   "num":
 440                     Number( data.getElementsByTagName("num")[0]
 441                         .childNodes[0].nodeValue ),
 442                   "hits": []
 443                 };
 444                 // parse all the first-level nodes for all <hit> tags
 445                 var hits = data.getElementsByTagName("hit");
 446                 for (i = 0; i < hits.length; i++)
 447                   show.hits[i] = Element_parseChildNodes(hits[i]);
 448             } else {
 449               context.throwError('Show failed. Malformed WS resonse.',
 450                   114);
 451             };
 452
 453             var approxNode = data.getElementsByTagName("approximation");
 454             if (approxNode && approxNode[0] && approxNode[0].childNodes[0] && approxNode[0].childNodes[0].nodeValue)
 455                 show['approximation'] =
 456                   Number( approxNode[0].childNodes[0].nodeValue);
 457
 458
 459               data.getElementsByTagName("")
 460             context.activeClients = activeClients;
 461             context.showCounter++;
 462             var delay = context.showTime;
 463             if (context.showCounter > context.showFastCount)
 464               delay += context.showCounter * context.dumpFactor;
 465             if ( activeClients > 0 )
 466               context.showTimer = setTimeout(
 467                 function () {
 468                   context.show();
 469                 },
 470                 delay);
 471             context.showCallback(show);
 472           }
 473         );
 474     },
 475     record: function(id, offset, syntax, handler)
 476     {
 477         // we may call record with no previous search if in proxy mode
 478         if(!this.searchStatusOK && this.useSessions)
 479            throw new Error(
 480             'Pz2.js: record command has to be preceded with a search command.'
 481             );
 482
 483         if( id !== undefined )
 484             this.currRecID = id;
 485
 486         var recordParams = {
 487             "command": "record",
 488             "session": this.sessionID,
 489             "id": this.currRecID,
 490             "windowid" : window.name
 491         };
 492
 493         this.currRecOffset = null;
 494         if (offset != undefined) {
 495             recordParams["offset"] = offset;
 496             this.currRecOffset = offset;
 497         }
 498
 499         if (syntax != undefined)
 500             recordParams['syntax'] = syntax;
 501
 502         //overwrite default callback id needed
 503         var callback = this.recordCallback;
 504         var args = undefined;
 505         if (handler != undefined) {
 506             callback = handler['callback'];
 507             args = handler['args'];
 508         }
 509
 510         var context = this;
 511         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 512
 513         request.safeGet(
 514             recordParams,
 515             function(data) {
 516                 var recordNode;
 517                 var record;
 518                 //raw record
 519                 if (context.currRecOffset !== null) {
 520                     record = new Array();
 521                     record['xmlDoc'] = data;
 522                     record['offset'] = context.currRecOffset;
 523                     callback(record, args);
 524                 //pz2 record
 525                 } else if ( recordNode =
 526                     data.getElementsByTagName("record")[0] ) {
 527                     // if stylesheet was fetched do not parse the response
 528                     if ( context.xslDoc ) {
 529                         record = new Array();
 530                         record['xmlDoc'] = data;
 531                         record['xslDoc'] = context.xslDoc;
 532                         record['recid'] =
 533                             recordNode.getElementsByTagName("recid")[0]
 534                                 .firstChild.nodeValue;
 535                     //parse record
 536                     } else {
 537                         record = Element_parseChildNodes(recordNode);
 538                     }
 539                     var activeClients =
 540                        Number( data.getElementsByTagName("activeclients")[0]
 541                                 .childNodes[0].nodeValue );
 542                     context.activeClients = activeClients;
 543                     context.recordCounter++;
 544                     var delay = context.recordTime + context.recordCounter * context.dumpFactor;
 545                     if ( activeClients > 0 )
 546                         context.recordTimer =
 547                            setTimeout (
 548                                function() {
 549                                   context.record(id, offset, syntax, handler);
 550                                   },
 551                                   delay
 552                                );
 553                     callback(record, args);
 554                 }
 555                 else
 556                     context.throwError('Record failed. Malformed WS resonse.',
 557                                         115);
 558             }
 559         );
 560     },
 561
 562     termlist: function()
 563     {
 564         if( !this.searchStatusOK && this.useSessions )
 565             throw new Error(
 566             'Pz2.js: termlist command has to be preceded with a search command.'
 567             );
 568
 569         // if called explicitly takes precedence
 570         clearTimeout(this.termTimer);
 571
 572         var context = this;
 573         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 574         request.safeGet(
 575             {
 576                 "command": "termlist",
 577                 "session": this.sessionID,
 578                 "name": this.termKeys,
 579                 "windowid" : window.name,
 580                 "version" : this.version
 581
 582             },
 583             function(data) {
 584                 if ( data.getElementsByTagName("termlist") ) {
 585                     var activeClients =
 586                         Number( data.getElementsByTagName("activeclients")[0]
 587                                     .childNodes[0].nodeValue );
 588                     context.activeClients = activeClients;
 589                     var termList = { "activeclients":  activeClients };
 590                     var termLists = data.getElementsByTagName("list");
 591                     //for each termlist
 592                     for (i = 0; i < termLists.length; i++) {
 593                         var listName = termLists[i].getAttribute('name');
 594                         termList[listName] = new Array();
 595                         var terms = termLists[i].getElementsByTagName('term');
 596                         //for each term in the list
 597                         for (j = 0; j < terms.length; j++) {
 598                             var term = {
 599                                 "name":
 600                                     (terms[j].getElementsByTagName("name")[0]
 601                                         .childNodes.length
 602                                     ? terms[j].getElementsByTagName("name")[0]
 603                                         .childNodes[0].nodeValue
 604                                     : 'ERROR'),
 605                                 "freq":
 606                                     terms[j]
 607                                     .getElementsByTagName("frequency")[0]
 608                                     .childNodes[0].nodeValue || 'ERROR'
 609                             };
 610
 611                             // Only for xtargets: id, records, filtered
 612                             var termIdNode =
 613                                 terms[j].getElementsByTagName("id");
 614                             if(terms[j].getElementsByTagName("id").length)
 615                                 term["id"] =
 616                                     termIdNode[0].childNodes[0].nodeValue;
 617                             termList[listName][j] = term;
 618
 619                             var recordsNode  = terms[j].getElementsByTagName("records");
 620                             if (recordsNode && recordsNode.length)
 621                                 term["records"] = recordsNode[0].childNodes[0].nodeValue;
 622
 623                             var filteredNode  = terms[j].getElementsByTagName("filtered");
 624                             if (filteredNode && filteredNode.length)
 625                                 term["filtered"] = filteredNode[0].childNodes[0].nodeValue;
 626
 627                         }
 628                     }
 629
 630                     context.termCounter++;
 631                     var delay = context.termTime
 632                         + context.termCounter * context.dumpFactor;
 633                     if ( activeClients > 0 )
 634                         context.termTimer =
 635                             setTimeout(
 636                                 function () {
 637                                     context.termlist();
 638                                 },
 639                                 delay
 640                             );
 641
 642                    context.termlistCallback(termList);
 643                 }
 644                 else
 645                     context.throwError('Termlist failed. Malformed WS resonse.',
 646                                         116);
 647             }
 648         );
 649
 650     },
 651     bytarget: function()
 652     {
 653         if( !this.initStatusOK && this.useSessions )
 654             throw new Error(
 655             'Pz2.js: bytarget command has to be preceded with a search command.'
 656             );
 657
 658         // no need to continue
 659         if( !this.searchStatusOK )
 660             return;
 661
 662         // if called explicitly takes precedence
 663         clearTimeout(this.bytargetTimer);
 664
 665         var context = this;
 666         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 667         request.safeGet(
 668             {
 669                 "command": "bytarget",
 670                 "session": this.sessionID,
 671                 "block": 1,
 672                 "windowid" : window.name,
 673                 "version" : this.version
 674             },
 675             function(data) {
 676                 if ( data.getElementsByTagName("status")[0]
 677                         .childNodes[0].nodeValue == "OK" ) {
 678                     var targetNodes = data.getElementsByTagName("target");
 679                     var bytarget = new Array();
 680                     for ( i = 0; i < targetNodes.length; i++) {
 681                         bytarget[i] = new Array();
 682                         for( j = 0; j < targetNodes[i].childNodes.length; j++ ) {
 683                             if ( targetNodes[i].childNodes[j].nodeType
 684                                 == Node.ELEMENT_NODE ) {
 685                                 var nodeName =
 686                                     targetNodes[i].childNodes[j].nodeName;
 687                                 if (targetNodes[i].childNodes[j].firstChild != null)
 688                                 {
 689                                     var nodeText = targetNodes[i].childNodes[j]
 690                                         .firstChild.nodeValue;
 691                                     bytarget[i][nodeName] = nodeText;
 692                                 }
 693                                 else {
 694                                     bytarget[i][nodeName] = "";
 695                                 }
 696
 697
 698                             }
 699                         }
 700                         if (bytarget[i]["state"]=="Client_Disconnected") {
 701                           bytarget[i]["hits"] = "Error";
 702                         } else if (bytarget[i]["state"]=="Client_Error") {
 703                           bytarget[i]["hits"] = "Error";
 704                         } else if (bytarget[i]["state"]=="Client_Working") {
 705                           bytarget[i]["hits"] = "...";
 706                         }
 707                         if (bytarget[i].diagnostic == "1") {
 708                           bytarget[i].diagnostic = "Permanent system error";
 709                         } else if (bytarget[i].diagnostic == "2") {
 710                           bytarget[i].diagnostic = "Temporary system error";
 711                         }
 712                         var targetsSuggestions = targetNodes[i].getElementsByTagName("suggestions");
 713                         if (targetsSuggestions != undefined && targetsSuggestions.length>0) {
 714                           var suggestions = targetsSuggestions[0];
 715                           bytarget[i]["suggestions"] = Element_parseChildNodes(suggestions);
 716                         }
 717                     }
 718
 719                     context.bytargetCounter++;
 720                     var delay = context.bytargetTime
 721                         + context.bytargetCounter * context.dumpFactor;
 722                     if ( context.activeClients > 0 )
 723                         context.bytargetTimer =
 724                             setTimeout(
 725                                 function () {
 726                                     context.bytarget();
 727                                 },
 728                                 delay
 729                             );
 730
 731                     context.bytargetCallback(bytarget);
 732                 }
 733                 else
 734                     context.throwError('Bytarget failed. Malformed WS resonse.',
 735                                         117);
 736             }
 737         );
 738     },
 739
 740     // just for testing, probably shouldn't be here
 741     showNext: function(page)
 742     {
 743         var step = page || 1;
 744         this.show( ( step * this.currentNum ) + this.currentStart );
 745     },
 746
 747     showPrev: function(page)
 748     {
 749         if (this.currentStart == 0 )
 750             return false;
 751         var step = page || 1;
 752         var newStart = this.currentStart - (step * this.currentNum );
 753         this.show( newStart > 0 ? newStart : 0 );
 754     },
 755
 756     showPage: function(pageNum)
 757     {
 758         //var page = pageNum || 1;
 759         this.show(pageNum * this.currentNum);
 760     }
 761 };
 762
 763 /*
 764 ********************************************************************************
 765 ** AJAX HELPER CLASS ***********************************************************
 766 ********************************************************************************
 767 */
 768 var pzHttpRequest = function ( url, errorHandler ) {
 769         this.maxUrlLength = 2048;
 770         this.request = null;
 771         this.url = url;
 772         this.errorHandler = errorHandler || null;
 773         this.async = true;
 774         this.requestHeaders = {};
 775
 776         if ( window.XMLHttpRequest ) {
 777             this.request = new XMLHttpRequest();
 778         } else if ( window.ActiveXObject ) {
 779             try {
 780                 this.request = new ActiveXObject( 'Msxml2.XMLHTTP' );
 781             } catch (err) {
 782                 this.request = new ActiveXObject( 'Microsoft.XMLHTTP' );
 783             }
 784         }
 785 };
 786
 787
 788 pzHttpRequest.prototype =
 789 {
 790     safeGet: function ( params, callback )
 791     {
 792         var encodedParams =  this.encodeParams(params);
 793         var url = this._urlAppendParams(encodedParams);
 794         if (url.length >= this.maxUrlLength) {
 795             this.requestHeaders["Content-Type"]
 796                 = "application/x-www-form-urlencoded";
 797             this._send( 'POST', this.url, encodedParams, callback );
 798         } else {
 799             this._send( 'GET', url, '', callback );
 800         }
 801     },
 802
 803     get: function ( params, callback )
 804     {
 805         this._send( 'GET', this._urlAppendParams(this.encodeParams(params)),
 806             '', callback );
 807     },
 808
 809     post: function ( params, data, callback )
 810     {
 811         this._send( 'POST', this._urlAppendParams(this.encodeParams(params)),
 812             data, callback );
 813     },
 814
 815     load: function ()
 816     {
 817         this.async = false;
 818         this.request.open( 'GET', this.url, this.async );
 819         this.request.send('');
 820         if ( this.request.status == 200 )
 821             return this.request.responseXML;
 822     },
 823
 824     encodeParams: function (params)
 825     {
 826         var sep = "";
 827         var encoded = "";
 828         for (var key in params) {
 829             if (params[key] != null) {
 830                 encoded += sep + key + '=' + encodeURIComponent(params[key]);
 831                 sep = '&';
 832             }
 833         }
 834         return encoded;
 835     },
 836
 837     _send: function ( type, url, data, callback)
 838     {
 839         var context = this;
 840         this.callback = callback;
 841         this.async = true;
 842         this.request.open( type, url, this.async );
 843         for (var key in this.requestHeaders)
 844             this.request.setRequestHeader(key, this.requestHeaders[key]);
 845         this.request.onreadystatechange = function () {
 846             context._handleResponse(url); /// url used ONLY for error reporting
 847         }
 848         this.request.send(data);
 849     },
 850
 851     _urlAppendParams: function (encodedParams)
 852     {
 853         if (encodedParams)
 854             return this.url + "?" + encodedParams;
 855         else
 856             return this.url;
 857     },
 858
 859     _handleResponse: function (savedUrlForErrorReporting)
 860     {
 861         if ( this.request.readyState == 4 ) {
 862             // pick up appplication errors first
 863             var errNode = null;
 864             if (this.request.responseXML &&
 865                 (errNode = this.request.responseXML.documentElement)
 866                 && errNode.nodeName == 'error') {
 867                 var errMsg = errNode.getAttribute("msg");
 868                 var errCode = errNode.getAttribute("code");
 869                 var errAddInfo = '';
 870                 if (errNode.childNodes.length)
 871                     errAddInfo = ': ' + errNode.childNodes[0].nodeValue;
 872
 873                 var err = new Error(errMsg + errAddInfo);
 874                 err.code = errCode;
 875
 876                 if (this.errorHandler) {
 877                     this.errorHandler(err);
 878                 }
 879                 else {
 880                     throw err;
 881                 }
 882             } else if (this.request.status == 200 &&
 883                        this.request.responseXML == null) {
 884               if (this.request.responseText != null) {
 885                 //assume JSON
 886
 887                 var json = null;
 888                 var text = this.request.responseText;
 889                 if (typeof window.JSON == "undefined")
 890                     json = eval("(" + text + ")");
 891                 else {
 892                     try {
 893                         json = JSON.parse(text);
 894                     }
 895                     catch (e) {
 896                         // Safari: eval will fail as well. Considering trying JSON2 (non-native implementation) instead
 897                         /* DEBUG only works in mk2-mobile
 898                         if (document.getElementById("log"))
 899                             document.getElementById("log").innerHTML = "" + e + " " + length + ": " + text;
 900                         */
 901                         try {
 902                             json = eval("(" + text + ")");
 903                         }
 904                         catch (e) {
 905                             /* DEBUG only works in mk2-mobile
 906                             if (document.getElementById("log"))
 907                                 document.getElementById("log").innerHTML = "" + e + " " + length + ": " + text;
 908                             */
 909                         }
 910                     }
 911                 }
 912                 this.callback(json, "json");
 913               } else {
 914                 var err = new Error("XML response is empty but no error " +
 915                                     "for " + savedUrlForErrorReporting);
 916                 err.code = -1;
 917                 if (this.errorHandler) {
 918                     this.errorHandler(err);
 919                 } else {
 920                     throw err;
 921                 }
 922               }
 923             } else if (this.request.status == 200) {
 924                 this.callback(this.request.responseXML);
 925             } else {
 926                 var err = new Error("HTTP response not OK: "
 927                             + this.request.status + " - "
 928                             + this.request.statusText );
 929                 err.code = '00' + this.request.status;
 930                 if (this.errorHandler) {
 931                     this.errorHandler(err);
 932                 }
 933                 else {
 934                     throw err;
 935                 }
 936             }
 937         }
 938     }
 939 };
 940
 941 /*
 942 ********************************************************************************
 943 ** XML HELPER FUNCTIONS ********************************************************
 944 ********************************************************************************
 945 */
 946
 947 // DOMDocument
 948
 949 if ( window.ActiveXObject) {
 950     var DOMDoc = document;
 951 } else {
 952     var DOMDoc = Document.prototype;
 953 }
 954
 955 DOMDoc.newXmlDoc = function ( root )
 956 {
 957     var doc;
 958
 959     if (document.implementation && document.implementation.createDocument) {
 960         doc = document.implementation.createDocument('', root, null);
 961     } else if ( window.ActiveXObject ) {
 962         doc = new ActiveXObject("MSXML2.DOMDocument");
 963         doc.loadXML('<' + root + '/>');
 964     } else {
 965         throw new Error ('No XML support in this browser');
 966     }
 967
 968     return doc;
 969 }
 970
 971
 972 DOMDoc.parseXmlFromString = function ( xmlString )
 973 {
 974     var doc;
 975
 976     if ( window.DOMParser ) {
 977         var parser = new DOMParser();
 978         doc = parser.parseFromString( xmlString, "text/xml");
 979     } else if ( window.ActiveXObject ) {
 980         doc = new ActiveXObject("MSXML2.DOMDocument");
 981         doc.loadXML( xmlString );
 982     } else {
 983         throw new Error ("No XML parsing support in this browser.");
 984     }
 985
 986     return doc;
 987 }
 988
 989 DOMDoc.transformToDoc = function (xmlDoc, xslDoc)
 990 {
 991     if ( window.XSLTProcessor ) {
 992         var proc = new XSLTProcessor();
 993         proc.importStylesheet( xslDoc );
 994         return proc.transformToDocument(xmlDoc);
 995     } else if ( window.ActiveXObject ) {
 996         return document.parseXmlFromString(xmlDoc.transformNode(xslDoc));
 997     } else {
 998         alert( 'Unable to perform XSLT transformation in this browser' );
 999     }
1000 }
1001
1002 // DOMElement
1003
1004 Element_removeFromDoc = function (DOM_Element)
1005 {
1006     DOM_Element.parentNode.removeChild(DOM_Element);
1007 }
1008
1009 Element_emptyChildren = function (DOM_Element)
1010 {
1011     while( DOM_Element.firstChild ) {
1012         DOM_Element.removeChild( DOM_Element.firstChild )
1013     }
1014 }
1015
1016 Element_appendTransformResult = function ( DOM_Element, xmlDoc, xslDoc )
1017 {
1018     if ( window.XSLTProcessor ) {
1019         var proc = new XSLTProcessor();
1020         proc.importStylesheet( xslDoc );
1021         var docFrag = false;
1022         docFrag = proc.transformToFragment( xmlDoc, DOM_Element.ownerDocument );
1023         DOM_Element.appendChild(docFrag);
1024     } else if ( window.ActiveXObject ) {
1025         DOM_Element.innerHTML = xmlDoc.transformNode( xslDoc );
1026     } else {
1027         alert( 'Unable to perform XSLT transformation in this browser' );
1028     }
1029 }
1030
1031 Element_appendTextNode = function (DOM_Element, tagName, textContent )
1032 {
1033     var node = DOM_Element.ownerDocument.createElement(tagName);
1034     var text = DOM_Element.ownerDocument.createTextNode(textContent);
1035
1036     DOM_Element.appendChild(node);
1037     node.appendChild(text);
1038
1039     return node;
1040 }
1041
1042 Element_setTextContent = function ( DOM_Element, textContent )
1043 {
1044     if (typeof DOM_Element.textContent !== "undefined") {
1045         DOM_Element.textContent = textContent;
1046     } else if (typeof DOM_Element.innerText !== "undefined" ) {
1047         DOM_Element.innerText = textContent;
1048     } else {
1049         throw new Error("Cannot set text content of the node, no such method.");
1050     }
1051 }
1052
1053 Element_getTextContent = function (DOM_Element)
1054 {
1055     if ( typeof DOM_Element.textContent != 'undefined' ) {
1056         return DOM_Element.textContent;
1057     } else if (typeof DOM_Element.text != 'undefined') {
1058         return DOM_Element.text;
1059     } else {
1060         throw new Error("Cannot get text content of the node, no such method.");
1061     }
1062 }
1063
1064 Element_parseChildNodes = function (node)
1065 {
1066     var parsed = {};
1067     var hasChildElems = false;
1068     var textContent = '';
1069
1070     if (node.hasChildNodes()) {
1071         var children = node.childNodes;
1072         for (var i = 0; i < children.length; i++) {
1073             var child = children[i];
1074             switch (child.nodeType) {
1075               case Node.ELEMENT_NODE:
1076                 hasChildElems = true;
1077                 var nodeName = child.nodeName;
1078                 if (!(nodeName in parsed))
1079                     parsed[nodeName] = [];
1080                 parsed[nodeName].push(Element_parseChildNodes(child));
1081                 break;
1082               case Node.TEXT_NODE:
1083                 textContent += child.nodeValue;
1084                 break;
1085               case Node.CDATA_SECTION_NODE:
1086                 textContent += child.nodeValue;
1087                 break;
1088             }
1089         }
1090     }
1091
1092     var attrs = node.attributes;
1093     for (var i = 0; i < attrs.length; i++) {
1094         hasChildElems = true;
1095         var attrName = '@' + attrs[i].nodeName;
1096         var attrValue = attrs[i].nodeValue;
1097         parsed[attrName] = attrValue;
1098     }
1099
1100     // if no nested elements/attrs set value to text
1101     if (hasChildElems)
1102       parsed['#text'] = textContent;
1103     else
1104       parsed = textContent;
1105
1106     return parsed;
1107 }
1108
1109 /* do not remove trailing bracket */
1110 }