js/pz2.js

   1 /*
   2  * Mine
   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 suplied.");
  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 (filter !== undefined)
 295                 searchParams["filter"] = filter;
 296
 297         // copy additional parmeters, do not overwrite
 298         if (addParamsArr != undefined) {
 299             for (var prop in addParamsArr) {
 300                 if (!searchParams.hasOwnProperty(prop))
 301                     searchParams[prop] = addParamsArr[prop];
 302             }
 303         }
 304
 305         var context = this;
 306         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 307         request.safeGet(
 308             searchParams,
 309             function(data) {
 310                 if ( data.getElementsByTagName("status")[0]
 311                         .childNodes[0].nodeValue == "OK" ) {
 312                     context.searchStatusOK = true;
 313                     //piggyback search
 314                     context.show(start, num, sort);
 315                     if (context.statCallback)
 316                         context.stat();
 317                     if (context.termlistCallback)
 318                         context.termlist();
 319                     if (context.bytargetCallback)
 320                         context.bytarget();
 321                 }
 322                 else
 323                     context.throwError('Search failed. Malformed WS resonse.',
 324                                         112);
 325             }
 326         );
 327     },
 328     stat: function()
 329     {
 330         if( !this.initStatusOK )
 331             throw new Error('Pz2.js: session not initialized.');
 332
 333         // if called explicitly takes precedence
 334         clearTimeout(this.statTimer);
 335
 336         var context = this;
 337         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 338         request.safeGet(
 339             { "command": "stat", "session": this.sessionID, "windowid" : window.name },
 340             function(data) {
 341                 if ( data.getElementsByTagName("stat") ) {
 342                     var activeClients =
 343                         Number( data.getElementsByTagName("activeclients")[0]
 344                                     .childNodes[0].nodeValue );
 345                     context.activeClients = activeClients;
 346
 347                     var stat = Element_parseChildNodes(data.documentElement);
 348
 349                     context.statCounter++;
 350                     var delay = context.statTime
 351                         + context.statCounter * context.dumpFactor;
 352
 353                     if ( activeClients > 0 )
 354                         context.statTimer =
 355                             setTimeout(
 356                                 function () {
 357                                     context.stat();
 358                                 },
 359                                 delay
 360                             );
 361                     context.statCallback(stat);
 362                 }
 363                 else
 364                     context.throwError('Stat failed. Malformed WS resonse.',
 365                                         113);
 366             }
 367         );
 368     },
 369     show: function(start, num, sort, query_state)
 370     {
 371         if( !this.searchStatusOK && this.useSessions )
 372             throw new Error(
 373                 'Pz2.js: show command has to be preceded with a search command.'
 374             );
 375
 376         // if called explicitly takes precedence
 377         clearTimeout(this.showTimer);
 378
 379         if( sort !== undefined )
 380             this.currentSort = sort;
 381         if( start !== undefined )
 382             this.currentStart = Number( start );
 383         if( num !== undefined )
 384             this.currentNum = Number( num );
 385
 386         var context = this;
 387         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 388         var requestParameters =
 389           {
 390               "command": "show",
 391               "session": this.sessionID,
 392               "start": this.currentStart,
 393               "num": this.currentNum,
 394               "sort": this.currentSort,
 395               "block": 1,
 396               "type": this.showResponseType,
 397               "windowid" : window.name,
 398           };
 399         if (query_state)
 400           requestParameters["query-state"] = query_state;
 401         if (this.version && this.version > 0)
 402             requestParameters["version"] = this.version;
 403         request.safeGet(
 404           requestParameters,
 405           function(data, type) {
 406             var show = null;
 407             var activeClients = 0;
 408             if (type === "json") {
 409               show = {};
 410               activeClients = Number(data.activeclients[0]);
 411               show.activeclients = activeClients;
 412               show.merged = Number(data.merged[0]);
 413               show.total = Number(data.total[0]);
 414               show.start = Number(data.start[0]);
 415               show.num = Number(data.num[0]);
 416               show.hits = data.hit;
 417             } else if (data.getElementsByTagName("status")[0]
 418                   .childNodes[0].nodeValue == "OK") {
 419                 // first parse the status data send along with records
 420                 // this is strictly bound to the format
 421                 activeClients =
 422                   Number(data.getElementsByTagName("activeclients")[0]
 423                       .childNodes[0].nodeValue);
 424                 show = {
 425                   "activeclients": activeClients,
 426                   "merged":
 427                     Number( data.getElementsByTagName("merged")[0]
 428                         .childNodes[0].nodeValue ),
 429                   "total":
 430                     Number( data.getElementsByTagName("total")[0]
 431                         .childNodes[0].nodeValue ),
 432                   "start":
 433                     Number( data.getElementsByTagName("start")[0]
 434                         .childNodes[0].nodeValue ),
 435                   "num":
 436                     Number( data.getElementsByTagName("num")[0]
 437                         .childNodes[0].nodeValue ),
 438                   "hits": []
 439                 };
 440                 // parse all the first-level nodes for all <hit> tags
 441                 var hits = data.getElementsByTagName("hit");
 442                 for (i = 0; i < hits.length; i++)
 443                   show.hits[i] = Element_parseChildNodes(hits[i]);
 444             } else {
 445               context.throwError('Show failed. Malformed WS resonse.',
 446                   114);
 447             };
 448
 449             var approxNode = data.getElementsByTagName("approximation");
 450             if (approxNode && approxNode[0] && approxNode[0].childNodes[0] && approxNode[0].childNodes[0].nodeValue)
 451                 show['approximation'] =
 452                   Number( approxNode[0].childNodes[0].nodeValue);
 453
 454
 455               data.getElementsByTagName("")
 456             context.activeClients = activeClients;
 457             context.showCounter++;
 458             var delay = context.showTime;
 459             if (context.showCounter > context.showFastCount)
 460               delay += context.showCounter * context.dumpFactor;
 461             if ( activeClients > 0 )
 462               context.showTimer = setTimeout(
 463                 function () {
 464                   context.show();
 465                 },
 466                 delay);
 467             context.showCallback(show);
 468           }
 469         );
 470     },
 471     record: function(id, offset, syntax, handler)
 472     {
 473         // we may call record with no previous search if in proxy mode
 474         if(!this.searchStatusOK && this.useSessions)
 475            throw new Error(
 476             'Pz2.js: record command has to be preceded with a search command.'
 477             );
 478
 479         if( id !== undefined )
 480             this.currRecID = id;
 481
 482         var recordParams = {
 483             "command": "record",
 484             "session": this.sessionID,
 485             "id": this.currRecID,
 486             "windowid" : window.name
 487         };
 488
 489         this.currRecOffset = null;
 490         if (offset != undefined) {
 491             recordParams["offset"] = offset;
 492             this.currRecOffset = offset;
 493         }
 494
 495         if (syntax != undefined)
 496             recordParams['syntax'] = syntax;
 497
 498         //overwrite default callback id needed
 499         var callback = this.recordCallback;
 500         var args = undefined;
 501         if (handler != undefined) {
 502             callback = handler['callback'];
 503             args = handler['args'];
 504         }
 505
 506         var context = this;
 507         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 508
 509         request.safeGet(
 510             recordParams,
 511             function(data) {
 512                 var recordNode;
 513                 var record;
 514                 //raw record
 515                 if (context.currRecOffset !== null) {
 516                     record = new Array();
 517                     record['xmlDoc'] = data;
 518                     record['offset'] = context.currRecOffset;
 519                     callback(record, args);
 520                 //pz2 record
 521                 } else if ( recordNode =
 522                     data.getElementsByTagName("record")[0] ) {
 523                     // if stylesheet was fetched do not parse the response
 524                     if ( context.xslDoc ) {
 525                         record = new Array();
 526                         record['xmlDoc'] = data;
 527                         record['xslDoc'] = context.xslDoc;
 528                         record['recid'] =
 529                             recordNode.getElementsByTagName("recid")[0]
 530                                 .firstChild.nodeValue;
 531                     //parse record
 532                     } else {
 533                         record = Element_parseChildNodes(recordNode);
 534                     }
 535                     var activeClients =
 536                        Number( data.getElementsByTagName("activeclients")[0]
 537                                 .childNodes[0].nodeValue );
 538                     context.activeClients = activeClients;
 539                     context.recordCounter++;
 540                     var delay = context.recordTime + context.recordCounter * context.dumpFactor;
 541                     if ( activeClients > 0 )
 542                         context.recordTimer =
 543                            setTimeout (
 544                                function() {
 545                                   context.record(id, offset, syntax, handler);
 546                                   },
 547                                   delay
 548                                );
 549                     callback(record, args);
 550                 }
 551                 else
 552                     context.throwError('Record failed. Malformed WS resonse.',
 553                                         115);
 554             }
 555         );
 556     },
 557
 558     termlist: function()
 559     {
 560         if( !this.searchStatusOK && this.useSessions )
 561             throw new Error(
 562             'Pz2.js: termlist command has to be preceded with a search command.'
 563             );
 564
 565         // if called explicitly takes precedence
 566         clearTimeout(this.termTimer);
 567
 568         var context = this;
 569         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 570         request.safeGet(
 571             {
 572                 "command": "termlist",
 573                 "session": this.sessionID,
 574                 "name": this.termKeys,
 575                 "windowid" : window.name,
 576                 "version" : this.version
 577
 578             },
 579             function(data) {
 580                 if ( data.getElementsByTagName("termlist") ) {
 581                     var activeClients =
 582                         Number( data.getElementsByTagName("activeclients")[0]
 583                                     .childNodes[0].nodeValue );
 584                     context.activeClients = activeClients;
 585                     var termList = { "activeclients":  activeClients };
 586                     var termLists = data.getElementsByTagName("list");
 587                     //for each termlist
 588                     for (i = 0; i < termLists.length; i++) {
 589                         var listName = termLists[i].getAttribute('name');
 590                         termList[listName] = new Array();
 591                         var terms = termLists[i].getElementsByTagName('term');
 592                         //for each term in the list
 593                         for (j = 0; j < terms.length; j++) {
 594                             var term = {
 595                                 "name":
 596                                     (terms[j].getElementsByTagName("name")[0]
 597                                         .childNodes.length
 598                                     ? terms[j].getElementsByTagName("name")[0]
 599                                         .childNodes[0].nodeValue
 600                                     : 'ERROR'),
 601                                 "freq":
 602                                     terms[j]
 603                                     .getElementsByTagName("frequency")[0]
 604                                     .childNodes[0].nodeValue || 'ERROR'
 605                             };
 606
 607                             // Only for xtargets: id, records, filtered
 608                             var termIdNode =
 609                                 terms[j].getElementsByTagName("id");
 610                             if(terms[j].getElementsByTagName("id").length)
 611                                 term["id"] =
 612                                     termIdNode[0].childNodes[0].nodeValue;
 613                             termList[listName][j] = term;
 614
 615                             var recordsNode  = terms[j].getElementsByTagName("records");
 616                             if (recordsNode && recordsNode.length)
 617                                 term["records"] = recordsNode[0].childNodes[0].nodeValue;
 618
 619                             var filteredNode  = terms[j].getElementsByTagName("filtered");
 620                             if (filteredNode && filteredNode.length)
 621                                 term["filtered"] = filteredNode[0].childNodes[0].nodeValue;
 622
 623                         }
 624                     }
 625
 626                     context.termCounter++;
 627                     var delay = context.termTime
 628                         + context.termCounter * context.dumpFactor;
 629                     if ( activeClients > 0 )
 630                         context.termTimer =
 631                             setTimeout(
 632                                 function () {
 633                                     context.termlist();
 634                                 },
 635                                 delay
 636                             );
 637
 638                    context.termlistCallback(termList);
 639                 }
 640                 else
 641                     context.throwError('Termlist failed. Malformed WS resonse.',
 642                                         116);
 643             }
 644         );
 645
 646     },
 647     bytarget: function()
 648     {
 649         if( !this.initStatusOK && this.useSessions )
 650             throw new Error(
 651             'Pz2.js: bytarget command has to be preceded with a search command.'
 652             );
 653
 654         // no need to continue
 655         if( !this.searchStatusOK )
 656             return;
 657
 658         // if called explicitly takes precedence
 659         clearTimeout(this.bytargetTimer);
 660
 661         var context = this;
 662         var request = new pzHttpRequest(this.pz2String, this.errorHandler);
 663         request.safeGet(
 664             {
 665                 "command": "bytarget",
 666                 "session": this.sessionID,
 667                 "block": 1,
 668                 "windowid" : window.name,
 669                 "version" : this.version
 670             },
 671             function(data) {
 672                 if ( data.getElementsByTagName("status")[0]
 673                         .childNodes[0].nodeValue == "OK" ) {
 674                     var targetNodes = data.getElementsByTagName("target");
 675                     var bytarget = new Array();
 676                     for ( i = 0; i < targetNodes.length; i++) {
 677                         bytarget[i] = new Array();
 678                         for( j = 0; j < targetNodes[i].childNodes.length; j++ ) {
 679                             if ( targetNodes[i].childNodes[j].nodeType
 680                                 == Node.ELEMENT_NODE ) {
 681                                 var nodeName =
 682                                     targetNodes[i].childNodes[j].nodeName;
 683                                 if (targetNodes[i].childNodes[j].firstChild != null)
 684                                 {
 685                                     var nodeText = targetNodes[i].childNodes[j]
 686                                         .firstChild.nodeValue;
 687                                     bytarget[i][nodeName] = nodeText;
 688                                 }
 689                                 else {
 690                                     bytarget[i][nodeName] = "";
 691                                 }
 692
 693
 694                             }
 695                         }
 696                         if (bytarget[i]["state"]=="Client_Disconnected") {
 697                           bytarget[i]["hits"] = "Error";
 698                         } else if (bytarget[i]["state"]=="Client_Error") {
 699                           bytarget[i]["hits"] = "Error";
 700                         } else if (bytarget[i]["state"]=="Client_Working") {
 701                           bytarget[i]["hits"] = "...";
 702                         }
 703                         if (bytarget[i].diagnostic == "1") {
 704                           bytarget[i].diagnostic = "Permanent system error";
 705                         } else if (bytarget[i].diagnostic == "2") {
 706                           bytarget[i].diagnostic = "Temporary system error";
 707                         }
 708                         var targetsSuggestions = targetNodes[i].getElementsByTagName("suggestions");
 709                         if (targetsSuggestions != undefined && targetsSuggestions.length>0) {
 710                           var suggestions = targetsSuggestions[0];
 711                           bytarget[i]["suggestions"] = Element_parseChildNodes(suggestions);
 712                         }
 713                     }
 714
 715                     context.bytargetCounter++;
 716                     var delay = context.bytargetTime
 717                         + context.bytargetCounter * context.dumpFactor;
 718                     if ( context.activeClients > 0 )
 719                         context.bytargetTimer =
 720                             setTimeout(
 721                                 function () {
 722                                     context.bytarget();
 723                                 },
 724                                 delay
 725                             );
 726
 727                     context.bytargetCallback(bytarget);
 728                 }
 729                 else
 730                     context.throwError('Bytarget failed. Malformed WS resonse.',
 731                                         117);
 732             }
 733         );
 734     },
 735
 736     // just for testing, probably shouldn't be here
 737     showNext: function(page)
 738     {
 739         var step = page || 1;
 740         this.show( ( step * this.currentNum ) + this.currentStart );
 741     },
 742
 743     showPrev: function(page)
 744     {
 745         if (this.currentStart == 0 )
 746             return false;
 747         var step = page || 1;
 748         var newStart = this.currentStart - (step * this.currentNum );
 749         this.show( newStart > 0 ? newStart : 0 );
 750     },
 751
 752     showPage: function(pageNum)
 753     {
 754         //var page = pageNum || 1;
 755         this.show(pageNum * this.currentNum);
 756     }
 757 };
 758
 759 /*
 760 ********************************************************************************
 761 ** AJAX HELPER CLASS ***********************************************************
 762 ********************************************************************************
 763 */
 764 var pzHttpRequest = function ( url, errorHandler ) {
 765         this.maxUrlLength = 2048;
 766         this.request = null;
 767         this.url = url;
 768         this.errorHandler = errorHandler || null;
 769         this.async = true;
 770         this.requestHeaders = {};
 771
 772         if ( window.XMLHttpRequest ) {
 773             this.request = new XMLHttpRequest();
 774         } else if ( window.ActiveXObject ) {
 775             try {
 776                 this.request = new ActiveXObject( 'Msxml2.XMLHTTP' );
 777             } catch (err) {
 778                 this.request = new ActiveXObject( 'Microsoft.XMLHTTP' );
 779             }
 780         }
 781 };
 782
 783
 784 pzHttpRequest.prototype =
 785 {
 786     safeGet: function ( params, callback )
 787     {
 788         var encodedParams =  this.encodeParams(params);
 789         var url = this._urlAppendParams(encodedParams);
 790         if (url.length >= this.maxUrlLength) {
 791             this.requestHeaders["Content-Type"]
 792                 = "application/x-www-form-urlencoded";
 793             this._send( 'POST', this.url, encodedParams, callback );
 794         } else {
 795             this._send( 'GET', url, '', callback );
 796         }
 797     },
 798
 799     get: function ( params, callback )
 800     {
 801         this._send( 'GET', this._urlAppendParams(this.encodeParams(params)),
 802             '', callback );
 803     },
 804
 805     post: function ( params, data, callback )
 806     {
 807         this._send( 'POST', this._urlAppendParams(this.encodeParams(params)),
 808             data, callback );
 809     },
 810
 811     load: function ()
 812     {
 813         this.async = false;
 814         this.request.open( 'GET', this.url, this.async );
 815         this.request.send('');
 816         if ( this.request.status == 200 )
 817             return this.request.responseXML;
 818     },
 819
 820     encodeParams: function (params)
 821     {
 822         var sep = "";
 823         var encoded = "";
 824         for (var key in params) {
 825             if (params[key] != null) {
 826                 encoded += sep + key + '=' + encodeURIComponent(params[key]);
 827                 sep = '&';
 828             }
 829         }
 830         return encoded;
 831     },
 832
 833     _send: function ( type, url, data, callback)
 834     {
 835         var context = this;
 836         this.callback = callback;
 837         this.async = true;
 838         this.request.open( type, url, this.async );
 839         for (var key in this.requestHeaders)
 840             this.request.setRequestHeader(key, this.requestHeaders[key]);
 841         this.request.onreadystatechange = function () {
 842             context._handleResponse(url); /// url used ONLY for error reporting
 843         }
 844         this.request.send(data);
 845     },
 846
 847     _urlAppendParams: function (encodedParams)
 848     {
 849         if (encodedParams)
 850             return this.url + "?" + encodedParams;
 851         else
 852             return this.url;
 853     },
 854
 855     _handleResponse: function (savedUrlForErrorReporting)
 856     {
 857         if ( this.request.readyState == 4 ) {
 858             // pick up appplication errors first
 859             var errNode = null;
 860             if (this.request.responseXML &&
 861                 (errNode = this.request.responseXML.documentElement)
 862                 && errNode.nodeName == 'error') {
 863                 var errMsg = errNode.getAttribute("msg");
 864                 var errCode = errNode.getAttribute("code");
 865                 var errAddInfo = '';
 866                 if (errNode.childNodes.length)
 867                     errAddInfo = ': ' + errNode.childNodes[0].nodeValue;
 868
 869                 var err = new Error(errMsg + errAddInfo);
 870                 err.code = errCode;
 871
 872                 if (this.errorHandler) {
 873                     this.errorHandler(err);
 874                 }
 875                 else {
 876                     throw err;
 877                 }
 878             } else if (this.request.status == 200 &&
 879                        this.request.responseXML == null) {
 880               if (this.request.responseText != null) {
 881                 //assume JSON
 882
 883                 var json = null;
 884                 var text = this.request.responseText;
 885                 if (typeof window.JSON == "undefined")
 886                     json = eval("(" + text + ")");
 887                 else {
 888                     try {
 889                         json = JSON.parse(text);
 890                     }
 891                     catch (e) {
 892                         // Safari: eval will fail as well. Considering trying JSON2 (non-native implementation) instead
 893                         /* DEBUG only works in mk2-mobile
 894                         if (document.getElementById("log"))
 895                             document.getElementById("log").innerHTML = "" + e + " " + length + ": " + text;
 896                         */
 897                         try {
 898                             json = eval("(" + text + ")");
 899                         }
 900                         catch (e) {
 901                             /* DEBUG only works in mk2-mobile
 902                             if (document.getElementById("log"))
 903                                 document.getElementById("log").innerHTML = "" + e + " " + length + ": " + text;
 904                             */
 905                         }
 906                     }
 907                 }
 908                 this.callback(json, "json");
 909               } else {
 910                 var err = new Error("XML response is empty but no error " +
 911                                     "for " + savedUrlForErrorReporting);
 912                 err.code = -1;
 913                 if (this.errorHandler) {
 914                     this.errorHandler(err);
 915                 } else {
 916                     throw err;
 917                 }
 918               }
 919             } else if (this.request.status == 200) {
 920                 this.callback(this.request.responseXML);
 921             } else {
 922                 var err = new Error("HTTP response not OK: "
 923                             + this.request.status + " - "
 924                             + this.request.statusText );
 925                 err.code = '00' + this.request.status;
 926                 if (this.errorHandler) {
 927                     this.errorHandler(err);
 928                 }
 929                 else {
 930                     throw err;
 931                 }
 932             }
 933         }
 934     }
 935 };
 936
 937 /*
 938 ********************************************************************************
 939 ** XML HELPER FUNCTIONS ********************************************************
 940 ********************************************************************************
 941 */
 942
 943 // DOMDocument
 944
 945 if ( window.ActiveXObject) {
 946     var DOMDoc = document;
 947 } else {
 948     var DOMDoc = Document.prototype;
 949 }
 950
 951 DOMDoc.newXmlDoc = function ( root )
 952 {
 953     var doc;
 954
 955     if (document.implementation && document.implementation.createDocument) {
 956         doc = document.implementation.createDocument('', root, null);
 957     } else if ( window.ActiveXObject ) {
 958         doc = new ActiveXObject("MSXML2.DOMDocument");
 959         doc.loadXML('<' + root + '/>');
 960     } else {
 961         throw new Error ('No XML support in this browser');
 962     }
 963
 964     return doc;
 965 }
 966
 967
 968 DOMDoc.parseXmlFromString = function ( xmlString )
 969 {
 970     var doc;
 971
 972     if ( window.DOMParser ) {
 973         var parser = new DOMParser();
 974         doc = parser.parseFromString( xmlString, "text/xml");
 975     } else if ( window.ActiveXObject ) {
 976         doc = new ActiveXObject("MSXML2.DOMDocument");
 977         doc.loadXML( xmlString );
 978     } else {
 979         throw new Error ("No XML parsing support in this browser.");
 980     }
 981
 982     return doc;
 983 }
 984
 985 DOMDoc.transformToDoc = function (xmlDoc, xslDoc)
 986 {
 987     if ( window.XSLTProcessor ) {
 988         var proc = new XSLTProcessor();
 989         proc.importStylesheet( xslDoc );
 990         return proc.transformToDocument(xmlDoc);
 991     } else if ( window.ActiveXObject ) {
 992         return document.parseXmlFromString(xmlDoc.transformNode(xslDoc));
 993     } else {
 994         alert( 'Unable to perform XSLT transformation in this browser' );
 995     }
 996 }
 997
 998 // DOMElement
 999
1000 Element_removeFromDoc = function (DOM_Element)
1001 {
1002     DOM_Element.parentNode.removeChild(DOM_Element);
1003 }
1004
1005 Element_emptyChildren = function (DOM_Element)
1006 {
1007     while( DOM_Element.firstChild ) {
1008         DOM_Element.removeChild( DOM_Element.firstChild )
1009     }
1010 }
1011
1012 Element_appendTransformResult = function ( DOM_Element, xmlDoc, xslDoc )
1013 {
1014     if ( window.XSLTProcessor ) {
1015         var proc = new XSLTProcessor();
1016         proc.importStylesheet( xslDoc );
1017         var docFrag = false;
1018         docFrag = proc.transformToFragment( xmlDoc, DOM_Element.ownerDocument );
1019         DOM_Element.appendChild(docFrag);
1020     } else if ( window.ActiveXObject ) {
1021         DOM_Element.innerHTML = xmlDoc.transformNode( xslDoc );
1022     } else {
1023         alert( 'Unable to perform XSLT transformation in this browser' );
1024     }
1025 }
1026
1027 Element_appendTextNode = function (DOM_Element, tagName, textContent )
1028 {
1029     var node = DOM_Element.ownerDocument.createElement(tagName);
1030     var text = DOM_Element.ownerDocument.createTextNode(textContent);
1031
1032     DOM_Element.appendChild(node);
1033     node.appendChild(text);
1034
1035     return node;
1036 }
1037
1038 Element_setTextContent = function ( DOM_Element, textContent )
1039 {
1040     if (typeof DOM_Element.textContent !== "undefined") {
1041         DOM_Element.textContent = textContent;
1042     } else if (typeof DOM_Element.innerText !== "undefined" ) {
1043         DOM_Element.innerText = textContent;
1044     } else {
1045         throw new Error("Cannot set text content of the node, no such method.");
1046     }
1047 }
1048
1049 Element_getTextContent = function (DOM_Element)
1050 {
1051     if ( typeof DOM_Element.textContent != 'undefined' ) {
1052         return DOM_Element.textContent;
1053     } else if (typeof DOM_Element.text != 'undefined') {
1054         return DOM_Element.text;
1055     } else {
1056         throw new Error("Cannot get text content of the node, no such method.");
1057     }
1058 }
1059
1060 Element_parseChildNodes = function (node)
1061 {
1062     var parsed = {};
1063     var hasChildElems = false;
1064
1065     if (node.hasChildNodes()) {
1066         var children = node.childNodes;
1067         for (var i = 0; i < children.length; i++) {
1068             var child = children[i];
1069             if (child.nodeType == Node.ELEMENT_NODE) {
1070                 hasChildElems = true;
1071                 var nodeName = child.nodeName;
1072                 if (!(nodeName in parsed))
1073                     parsed[nodeName] = [];
1074                 parsed[nodeName].push(Element_parseChildNodes(child));
1075             }
1076         }
1077     }
1078
1079     var attrs = node.attributes;
1080     for (var i = 0; i < attrs.length; i++) {
1081         var attrName = '@' + attrs[i].nodeName;
1082         var attrValue = attrs[i].nodeValue;
1083         parsed[attrName] = attrValue;
1084     }
1085
1086     // if no nested elements, get text content
1087     if (node.hasChildNodes() && !hasChildElems) {
1088         if (node.attributes.length)
1089             parsed['#text'] = node.firstChild.nodeValue;
1090         else
1091             parsed = node.firstChild.nodeValue;
1092     }
1093
1094     return parsed;
1095 }
1096
1097 /* do not remove trailing bracket */
1098 }