root/js/componentload.js

   1 // Global state variables
   2 var selectedTextID;
   3 var selectedTextInfo;
   4 var selectedTextEditable;
   5 var selectedStemmaID = -1;
   6 var stemmata = [];
   7
   8 // Load the names of the appropriate traditions into the directory div.
   9 function refreshDirectory () {
  10         var lmesg = $('#loading_message').clone();
  11         $('#directory').empty().append( lmesg.contents() );
  12     $('#directory').load( _get_url(["directory"]),
  13         function(response, status, xhr) {
  14                         if (status == "error") {
  15                                 var msg = "An error occurred: ";
  16                                 $("#directory").html(msg + xhr.status + " " + xhr.statusText);
  17                         } else {
  18                                 if( textOnLoad != "" ) {
  19                                         // Call the click callback for the relevant text, if it is
  20                                         // in the page.
  21                                         $('#'+textOnLoad).click();
  22                                         textOnLoad = "";
  23                                 }
  24                         }
  25                 }
  26         );
  27 }
  28
  29 // Load a tradition with its information and stemmata into the tradition
  30 // view pane. Calls load_textinfo.
  31 function loadTradition( textid, textname, editable ) {
  32         selectedTextID = textid;
  33         selectedTextEditable = editable;
  34     // First insert the placeholder image and register an error handler
  35     $('#textinfo_load_status').empty();
  36     $('#stemma_graph').empty();
  37     $('#textinfo_waitbox').show();
  38     $('#textinfo_container').hide().ajaxError(
  39         function(event, jqXHR, ajaxSettings, thrownError) {
  40         if( ajaxSettings.url.indexOf( 'textinfo' ) > -1 && ajaxSettings.type == 'GET'  ) {
  41                         $('#textinfo_waitbox').hide();
  42                         $('#textinfo_container').show();
  43                         display_error( jqXHR, $("#textinfo_load_status") );
  44         }
  45     });
  46
  47     // Hide the functionality that is irrelevant
  48     if( editable ) {
  49         $('#open_stemma_add').show();
  50         $('#open_textinfo_edit').show();
  51         $('#relatebutton_label').text('View collation and edit relationships');
  52     } else {
  53         $('#open_stemma_add').hide();
  54         $('#open_stemweb_ui').hide();
  55         $('#query_stemweb_ui').hide();
  56         $('#open_textinfo_edit').hide();
  57         $('#relatebutton_label').text('View collation and relationships');
  58     }
  59
  60     // Then get and load the actual content.
  61     // TODO: scale #stemma_graph both horizontally and vertically
  62     // TODO: load svgs from SVG.Jquery (to make scaling react in Safari)
  63     $.getJSON( _get_url([ "textinfo", textid ]), function (textdata) {
  64         // Add the scalar data
  65         selectedTextInfo = textdata;
  66         load_textinfo();
  67         // Add the stemma(ta)
  68         stemmata = textdata.stemmata;
  69         if( stemmata.length ) {
  70                 selectedStemmaID = 0;
  71         } else {
  72                 selectedStemmaID = -1;
  73                 }
  74                 load_stemma( selectedStemmaID );
  75         // Set up the relationship mapper button
  76                 $('#run_relater').attr( 'action', _get_url([ "relation", textid ]) );
  77                 // Set up the download button
  78                 $('#dl_tradition').attr( 'href', _get_url([ "download", textid ]) );
  79                 $('#dl_tradition').attr( 'download', selectedTextInfo.name + '.xml' );
  80         });
  81 }
  82
  83 // Load the metadata about a tradition into the appropriate div.
  84 function load_textinfo() {
  85         $('#textinfo_waitbox').hide();
  86         $('#textinfo_load_status').empty();
  87         $('#textinfo_container').show();
  88         // The tradition name should appear here and should be identical in the
  89         // corresponding directory span. In case the name was just changed...
  90         $('.texttitle').empty().append( selectedTextInfo.name );
  91         $('#' + selectedTextID).empty().append( selectedTextInfo.name );
  92         // Witnesses
  93         $('#witness_num').empty().append( selectedTextInfo.witnesses.size );
  94         $('#witness_list').empty().append( selectedTextInfo.witnesses.join( ', ' ) );
  95         // Who the owner is
  96         $('#owner_id').empty().append('no one');
  97         if( selectedTextInfo.owner ) {
  98                 var owneremail = selectedTextInfo.owner;
  99                 var chop = owneremail.indexOf( '@' );
 100                 if( chop > -1 ) {
 101                         owneremail = owneremail.substr( 0, chop + 1 ) + '...';
 102                 }
 103                 $('#owner_id').empty().append( owneremail );
 104         }
 105         // Whether or not it is public
 106         $('#not_public').empty();
 107         if( selectedTextInfo['public'] == false ) {
 108                 $('#not_public').append('NOT ');
 109         }
 110         // What language setting it has, if any
 111         $('#marked_language').empty().append('no language set');
 112         if( selectedTextInfo.language && selectedTextInfo.language != 'Default' ) {
 113                 $('#marked_language').empty().append( selectedTextInfo.language );
 114         }
 115 }
 116
 117 // Enable / disable the appropriate buttons for paging through the stemma.
 118 function show_stemmapager () {
 119       $('.pager_left_button').unbind('click').addClass( 'greyed_out' );
 120       $('.pager_right_button').unbind('click').addClass( 'greyed_out' );
 121       if( selectedStemmaID > 0 ) {
 122               $('.pager_left_button').click( function () {
 123                       load_stemma( selectedStemmaID - 1, selectedTextEditable );
 124               }).removeClass( 'greyed_out' );
 125       }
 126       if( selectedStemmaID + 1 < stemmata.length ) {
 127               $('.pager_right_button').click( function () {
 128                       load_stemma( selectedStemmaID + 1, selectedTextEditable );
 129               }).removeClass( 'greyed_out' );
 130       }
 131 }
 132
 133 // Load a given stemma SVG into the stemmagraph box.
 134 function load_stemma( idx ) {
 135         // Load the stemma at idx
 136         selectedStemmaID = idx;
 137         show_stemmapager( selectedTextEditable );
 138         $('#open_stemma_edit').hide();
 139         $('#run_stexaminer').hide();
 140         $('#stemma_identifier').empty();
 141         // Add the relevant Stemweb functionality
 142         if( selectedTextEditable ) {
 143                 switch_stemweb_ui();
 144         }
 145         if( idx > -1 ) {
 146                 // Load the stemma and its properties
 147                 var stemmadata = stemmata[idx];
 148                 if( selectedTextEditable ) {
 149                         $('#open_stemma_edit').show();
 150                 }
 151                 if( stemmadata.directed ) {
 152                         // Stexaminer submit action
 153                         var stexpath = _get_url([ "stexaminer", selectedTextID, idx ]);
 154                         $('#run_stexaminer').attr( 'action', stexpath );
 155                         $('#run_stexaminer').show();
 156                 }
 157                 loadSVG( stemmadata.svg );
 158                 $('#stemma_identifier').text( stemmadata.name );
 159         setTimeout( 'start_element_height = $("#stemma_graph .node")[0].getBBox().height;', 500 );
 160         }
 161 }
 162
 163 function switch_stemweb_ui() {
 164         if( selectedTextInfo.stemweb_jobid == 0 ) {
 165                 // We want to run Stemweb.
 166                 $('#open_stemweb_ui').show();
 167                 $('#query_stemweb_ui').hide();
 168                 if( ! $('#stemweb-ui-dialog').dialog('isOpen') ) {
 169                         $('#call_stemweb').show()
 170                         $('#stemweb_run_button').show();
 171                 }
 172         } else {
 173                 $('#query_stemweb_ui').show();
 174                 $('#open_stemweb_ui').hide();
 175                 $('#call_stemweb').hide();
 176                 $('#stemweb_run_button').hide();
 177         }
 178 }
 179
 180 function query_stemweb_progress() {
 181         var requrl = _get_url([ "stemweb", "query", selectedTextInfo.stemweb_jobid ]);
 182         $('#stemweb-ui-dialog').dialog('open');
 183         $('#stemweb_run_status').empty().append(
 184                                 _make_message( 'notification', 'Querying Stemweb for calculation progress...') );
 185         $.getJSON( requrl, function (data) {
 186                 process_stemweb_result( data );
 187         });
 188 }
 189
 190 function process_stemweb_result(data) {
 191         // Look for a status message, either success, running, or notfound.
 192         if( data.status === 'success' ) {
 193                 // Add the new stemmata to the textinfo and tell the user.
 194                 selectedTextInfo.stemweb_jobid = 0;
 195                 if( data.stemmata.length > 0 ) {
 196                         stemmata = stemmata.concat( data.stemmata );
 197                         if( selectedStemmaID == -1 ) {
 198                                 // We have a stemma for the first time; load the first one.
 199                                 load_stemma( 0, true );
 200                         } else {
 201                                 // Move to the index of the first added stemma.
 202                                 var newIdx = stemmata.length - data.stemmata.length;
 203                                 load_stemma( newIdx, true );
 204                         }
 205                         // Hide the call dialog no matter how we got here
 206                         $('#call_stemweb').hide()
 207                         $('#stemweb_run_button').hide();
 208                         $('#stemweb_run_status').empty().append(
 209                                 _make_message( 'notification', 'You have one or more new stemmata!' ) );
 210                 } else {
 211                         $('#stemweb_run_status').empty().append(
 212                                 _make_message( 'warning', 'Stemweb run finished with no stemmata...huh?!' ) );
 213                 }
 214         } else if( data.status === 'running' ) {
 215                 // Just tell the user.
 216                 $('#stemweb_run_status').empty().append(
 217                                 _make_message( 'warning', 'Your Stemweb query is still running!' ) );
 218         } else if( data.status === 'notfound' ) {
 219                 // Ask the user to refresh, for now.
 220                 $('#stemweb_run_status').empty().append(
 221                                 _make_message( 'warning', 'Your Stemweb query probably finished and reported back. Please reload to check.' ) );
 222         } else if( data.status === 'failed' ) {
 223                 selectedTextInfo.stemweb_jobid = 0;
 224                 failureMsg = 'Your stemweb query failed';
 225                 if( data.message ) {
 226                         failureMsg = failureMsg + ' with the following message: ' + data.message
 227                 } else {
 228                         failureMsg = failureMsg + ' without telling us why.'
 229                 }
 230                 $('#stemweb_run_status').empty().append(
 231                                 _make_message( 'error', failureMsg ) );
 232         }
 233 }
 234
 235 function _make_message( type, msg ) {
 236         theMessage = $('<span>').attr( 'class', type );
 237         theMessage.append( msg );
 238         return theMessage;
 239 }
 240
 241 // Load the SVG we are given
 242 function loadSVG(svgData) {
 243         var svgElement = $('#stemma_graph');
 244
 245         $(svgElement).svg('destroy');
 246
 247         $(svgElement).svg({
 248                 loadURL: svgData,
 249                 onLoad : function () {
 250                         var theSVG = svgElement.find('svg');
 251                         var svgoffset = theSVG.offset();
 252                         var browseroffset = 1;
 253                         // Firefox needs a different offset, stupidly enough
 254                         if( navigator.userAgent.indexOf('Firefox') > -1 ) {
 255                                 browseroffset = 3; // works for tall images
 256                                 // ...but if the SVG is wider than it is tall, Firefox treats
 257                                 // the top as being the top of the graph, loaded into the middle
 258                                 // of the canvas, but then the margin at the top of the canvas
 259                                 // extends upward. So we have to find the actual top of the canvas
 260                                 // and correct for *that* instead.
 261                                 var vbdim = svgElement.svg().svg('get').root().viewBox.baseVal;
 262                                 if( vbdim.height < vbdim.width ) {
 263                                         var vbscale = svgElement.width() / vbdim.width;
 264                                         var vbrealheight = vbdim.height * vbscale;
 265                                         browseroffset = 3 + ( svgElement.height() - vbrealheight ) / 2;
 266                                 }
 267                         }
 268                         var topoffset = theSVG.position().top - svgElement.position().top - browseroffset;
 269                         theSVG.offset({ top: svgoffset.top - topoffset, left: svgoffset.left });
 270                         set_stemma_interactive( theSVG );
 271                 }
 272         });
 273 }
 274
 275 function set_stemma_interactive( svg_element ) {
 276         if( selectedTextEditable ) {
 277           // unbind is needed as this set_stemma_interactive is called each time
 278           // the stemma is re-rooted, and each time jquery adds an
 279           // onclick handler to the root_tree_dialog_button_ok
 280           // that all re-root the stemma, that all add an onclick, etc..
 281           $( "#root_tree_dialog_button_ok" ).unbind();
 282                 $( "#root_tree_dialog_button_ok" ).click( function() {
 283                         var requrl = _get_url([ "stemmaroot", selectedTextID, selectedStemmaID ]);
 284                         var targetnode = $('#root_tree_dialog').data( 'selectedNode' );
 285                         $.post( requrl, { root: targetnode }, function (data) {
 286                                 // Reload the new stemma
 287                                 stemmata[selectedStemmaID] = data;
 288                                 load_stemma( selectedStemmaID );
 289                                 // Put away the dialog
 290                                 $('#root_tree_dialog').data( 'selectedNode', null ).hide();
 291                         } );
 292                 } ).ajaxError( function(event, jqXHR, ajaxSettings, thrownError) {
 293                         if( ajaxSettings.url.indexOf( 'stemmaroot' ) > -1
 294                                 && ajaxSettings.type == 'POST' ) {
 295                                 display_error( jqXHR, $("#stemma_load_status") );
 296                         }
 297                 } );
 298                 // TODO Clear error at some appropriate point
 299                 $.each( $( 'ellipse', svg_element ), function(index) {
 300                         var ellipse = $(this);
 301                         var g = ellipse.parent( 'g' );
 302                         g.click( function(evt) {
 303                                 if( typeof root_tree_dialog_timeout !== 'undefined' ) { clearTimeout( root_tree_dialog_timeout ) };
 304                                 g.unbind( 'mouseleave' );
 305                                 var dialog = $( '#root_tree_dialog' );
 306                                 // Note which node triggered the dialog
 307                                 dialog.data( 'selectedNode', g.attr('id') );
 308                                 // Position the dialog
 309                                 dialog.hide();
 310                                 dialog.css( 'top', evt.pageY + 3 );
 311                                 dialog.css( 'left', evt.pageX + 3 );
 312                                 dialog.show();
 313                                 root_tree_dialog_timeout = setTimeout( function() {
 314                                         $( '#root_tree_dialog' ).data( 'selectedNode', null ).hide();
 315                                         ellipse.removeClass( 'stemma_node_highlight' );
 316                                         g.mouseleave( function() { ellipse.removeClass( 'stemma_node_highlight' ) } );
 317                                 }, 3000 );
 318                         } );
 319                         g.mouseenter( function() {
 320                                 $( 'ellipse.stemma_node_highlight' ).removeClass( 'stemma_node_highlight' );
 321                                 ellipse.addClass( 'stemma_node_highlight' )
 322                         } );
 323                         g.mouseleave( function() { ellipse.removeClass( 'stemma_node_highlight' ) } );
 324                 } );
 325         }
 326 }
 327
 328 // General-purpose error-handling function.
 329 // TODO make sure this gets used throughout, where appropriate.
 330 function display_error( jqXHR, el ) {
 331         var errmsg;
 332         if( jqXHR.responseText == "" ) {
 333                 errmsg = "perhaps the server went down?"
 334         } else {
 335                 var errobj;
 336                 try {
 337                         errobj = jQuery.parseJSON( jqXHR.responseText );
 338                         errmsg = errobj.error;
 339                 } catch ( parse_err ) {
 340                         errmsg = "something went wrong on the server."
 341                 }
 342         }
 343         var msghtml = $('<span>').attr('class', 'error').text( "An error occurred: " + errmsg );
 344         $(el).empty().append( msghtml ).show();
 345 }
 346
 347 // Event to enable the upload button when a file has been selected
 348 function file_selected( e ) {
 349         if( e.files.length == 1 ) {
 350                 $('#upload_button').button('enable');
 351                 $('#new_file_name_container').html( '<span id="new_file_name">' + e.files[0].name + '</span>' );
 352         } else {
 353                 $('#upload_button').button('disable');
 354                 $('#new_file_name_container').html( '(Use \'pick file\' to select a tradition file to upload.)' );
 355         }
 356 }
 357
 358 // Implement our own AJAX method that uses the features of XMLHttpRequest2
 359 // but try to let it have a similar interface to jquery.post
 360 // The data var needs to be a FormData() object.
 361 // The callback will be given a single argument, which is the response data
 362 // of the given type.
 363
 364 function post_xhr2( url, data, cb, type ) {
 365         if( !type ) {
 366                 type = 'json';
 367         }
 368         var xhr = new XMLHttpRequest();
 369         // Set the expected response type
 370         if( type === 'data' ) {
 371                 xhr.responseType = 'blob';
 372         } else if( type === 'xml' ) {
 373                 xhr.responseType = 'document';
 374         }
 375         // Post the form
 376         // Gin up an AJAX settings object
 377         $.ajaxSetup({ url: url, type: 'POST' });
 378         xhr.open( 'POST', url, true );
 379         // Handle the results
 380         xhr.onload = function( e ) {
 381                 // Get the response and parse it
 382                 // Call the callback with the response, whatever it was
 383                 var xhrs = e.target;
 384                 if( xhrs.status > 199 && xhrs.status < 300  ) { // Success
 385                         var resp;
 386                         if( type === 'json' ) {
 387                                 resp = $.parseJSON( xhrs.responseText );
 388                         } else if ( type === 'xml' ) {
 389                                 resp = xhrs.responseXML;
 390                         } else if ( type === 'text' ) {
 391                                 resp = xhrs.responseText;
 392                         } else {
 393                                 resp = xhrs.response;
 394                         }
 395                         cb( resp );
 396                 } else {
 397                         // Trigger the ajaxError...
 398                         _trigger_ajaxerror( e );
 399                 }
 400         };
 401         xhr.onerror = _trigger_ajaxerror;
 402         xhr.onabort = _trigger_ajaxerror;
 403         xhr.send( data );
 404 }
 405
 406 function _trigger_ajaxerror( e ) {
 407         var xhr = e.target;
 408         var thrown = xhr.statusText || 'Request error';
 409         jQuery.event.trigger( 'ajaxError', [ xhr, $.ajaxSettings, thrown ]);
 410 }
 411
 412 function upload_new () {
 413         // Serialize the upload form, get the file and attach it to the request,
 414         // POST the lot and handle the response.
 415         var newfile = $('#new_file').get(0).files[0];
 416         var reader = new FileReader();
 417         reader.onload = function( evt ) {
 418                 var data = new FormData();
 419                 $.each( $('#new_tradition').serializeArray(), function( i, o ) {
 420                                 data.append( o.name, o.value );
 421                         });
 422                 data.append( 'file', newfile );
 423                 var upload_url = _get_url([ 'newtradition' ]);
 424                 post_xhr2( upload_url, data, function( ret ) {
 425                         if( ret.id ) {
 426                                 $('#upload-collation-dialog').dialog('close');
 427                                 refreshDirectory();
 428                                 loadTradition( ret.id, ret.name, 1 );
 429                         } else if( ret.error ) {
 430                                 $('#upload_status').empty().append(
 431                                         $('<span>').attr('class', 'error').append( ret.error ) );
 432                         }
 433                 }, 'json' );
 434         };
 435         reader.onerror = function( evt ) {
 436                 var err_resp = 'File read error';
 437                 if( e.name == 'NotFoundError' ) {
 438                         err_resp = 'File not found';
 439                 } else if ( e.name == 'NotReadableError' ) {
 440                         err_resp == 'File unreadable - is it yours?';
 441                 } else if ( e.name == 'EncodingError' ) {
 442                         err_resp == 'File cannot be encoded - is it too long?';
 443                 } else if ( e.name == 'SecurityError' ) {
 444                         err_resp == 'File read security error';
 445                 }
 446                 // Fake a jqXHR object that we can pass to our generic error handler.
 447                 var jqxhr = { responseText: '{error:"' + err_resp + '"}' };
 448                 display_error( jqxhr, $('#upload_status') );
 449                 $('#upload_button').button('disable');
 450         }
 451
 452         reader.readAsBinaryString( newfile );
 453 }
 454
 455 // Utility function to neatly construct an application URL
 456 function _get_url( els ) {
 457         return basepath + els.join('/');
 458 }
 459
 460 // TODO Attach unified ajaxError handler to document
 461 $(document).ready( function() {
 462         // See if we have the browser functionality we need
 463         // TODO Also think of a test for SVG readiness
 464         if( !!window.FileReader && !!window.File ) {
 465                 $('#compatibility_check').empty();
 466         }
 467
 468     // hide dialog not yet in use
 469     $('#root_tree_dialog').hide();
 470
 471     // call out to load the directory div
 472     $('#textinfo_container').hide();
 473     $('#textinfo_waitbox').hide();
 474         refreshDirectory();
 475
 476         // Set up the textinfo edit dialog
 477         $('#textinfo-edit-dialog').dialog({
 478                 autoOpen: false,
 479                 height: 200,
 480                 width: 300,
 481                 modal: true,
 482                 buttons: {
 483                         Save: function (evt) {
 484                                 $("#edit_textinfo_status").empty();
 485                                 var mybuttons = $(evt.target).closest('button').parent().find('button');
 486                                 mybuttons.button( 'disable' );
 487                                 var requrl = _get_url([ "textinfo", selectedTextID ]);
 488                                 var reqparam = $('#edit_textinfo').serialize();
 489                                 $.post( requrl, reqparam, function (data) {
 490                                         // Reload the selected text fields
 491                                         selectedTextInfo = data;
 492                                         load_textinfo();
 493                                         // Reenable the button and close the form
 494                                         mybuttons.button("enable");
 495                                         $('#textinfo-edit-dialog').dialog('close');
 496                                 }, 'json' );
 497                         },
 498                         Cancel: function() {
 499                                 $('#textinfo-edit-dialog').dialog('close');
 500                         }
 501                 },
 502                 open: function() {
 503                         $("#edit_textinfo_status").empty();
 504                         // Populate the form fields with the current values
 505                         // edit_(name, language, public, owner)
 506                         $.each([ 'name', 'language', 'owner' ], function( idx, k ) {
 507                                 var fname = '#edit_' + k;
 508                                 // Special case: language Default is basically language null
 509                                 if( k == 'language' && selectedTextInfo[k] == 'Default' ) {
 510                                         $(fname).val( "" );
 511                                 } else {
 512                                         $(fname).val( selectedTextInfo[k] );
 513                                 }
 514                         });
 515                         if( selectedTextInfo['public'] == true ) {
 516                                 $('#edit_public').attr('checked','true');
 517                         } else {
 518                                 $('#edit_public').removeAttr('checked');
 519                         }
 520                 },
 521         }).ajaxError( function(event, jqXHR, ajaxSettings, thrownError) {
 522                 $(event.target).parent().find('.ui-button').button("enable");
 523         if( ajaxSettings.url.indexOf( 'textinfo' ) > -1
 524                 && ajaxSettings.type == 'POST' ) {
 525                         display_error( jqXHR, $("#edit_textinfo_status") );
 526         }
 527         });
 528
 529
 530         // Set up the stemma editor dialog
 531         $('#stemma-edit-dialog').dialog({
 532                 autoOpen: false,
 533                 height: 700,
 534                 width: 600,
 535                 modal: true,
 536                 buttons: {
 537                         Save: function (evt) {
 538                                 $("#edit_stemma_status").empty();
 539                                 var mybuttons = $(evt.target).closest('button').parent().find('button');
 540                                 mybuttons.button( 'disable' );
 541                                 var stemmaseq = $('#stemmaseq').val();
 542                                 var requrl = _get_url([ "stemma", selectedTextID, stemmaseq ]);
 543                                 var reqparam = { 'dot': $('#dot_field').val() };
 544                                 // TODO We need to stash the literal SVG string in stemmata
 545                                 // somehow. Implement accept header on server side to decide
 546                                 // whether to send application/json or application/xml?
 547                                 $.post( requrl, reqparam, function (data) {
 548                                         // We received a stemma SVG string in return.
 549                                         // Update the current stemma sequence number
 550                                         selectedStemmaID = data.stemmaid;
 551                                         delete data.stemmaid;
 552                                         // Stash the answer in the appropriate spot in our stemma array
 553                                         stemmata[selectedStemmaID] = data;
 554                                         // Display the new stemma
 555                                         load_stemma( selectedStemmaID, true );
 556                                         // Reenable the button and close the form
 557                                         mybuttons.button("enable");
 558                                         $('#stemma-edit-dialog').dialog('close');
 559                                 }, 'json' );
 560                         },
 561                         Cancel: function() {
 562                                 $('#stemma-edit-dialog').dialog('close');
 563                         }
 564                 },
 565                 open: function(evt) {
 566                         $("#edit_stemma_status").empty();
 567                         var stemmaseq = $('#stemmaseq').val();
 568                         if( stemmaseq == 'n' ) {
 569                                 // If we are creating a new stemma, populate the textarea with a
 570                                 // bare digraph.
 571                                 $(evt.target).dialog('option', 'title', 'Add a new stemma')
 572                                 $('#dot_field').val( "digraph \"NAME STEMMA HERE\" {\n\n}" );
 573                         } else {
 574                                 // If we are editing a stemma, grab its stemmadot and populate the
 575                                 // textarea with that.
 576                                 $(evt.target).dialog('option', 'title', 'Edit selected stemma')
 577                                 $('#dot_field').val( 'Loading, please wait...' );
 578                                 var doturl = _get_url([ "stemmadot", selectedTextID, stemmaseq ]);
 579                                 $.getJSON( doturl, function (data) {
 580                                         // Re-insert the line breaks
 581                                         var dotstring = data.dot.replace(/\|n/gm, "\n");
 582                                         $('#dot_field').val( dotstring );
 583                                 });
 584                         }
 585                 },
 586         }).ajaxError( function(event, jqXHR, ajaxSettings, thrownError) {
 587                 $(event.target).parent().find('.ui-button').button("enable");
 588         if( ajaxSettings.url.indexOf( 'stemma' ) > -1
 589                 && ajaxSettings.type == 'POST' ) {
 590                         display_error( jqXHR, $("#edit_stemma_status") );
 591         }
 592         });
 593
 594         $('#stemweb-ui-dialog').dialog({
 595                 autoOpen: false,
 596                 height: 'auto',
 597                 width: 520,
 598                 modal: true,
 599                 buttons: {
 600                         Run: {
 601                                 id: 'stemweb_run_button',
 602                                 text: 'Run',
 603                                 click: function (evt) {
 604                                 $("#stemweb_run_status").empty();
 605                                 var mybuttons = $(evt.target).closest('button').parent().find('button');
 606                                 mybuttons.button( 'disable' );
 607                                 var requrl = _get_url([ "stemweb", "request" ]);
 608                                 var reqparam = $('#call_stemweb').serialize();
 609                                 // TODO We need to stash the literal SVG string in stemmata
 610                                 // somehow. Implement accept header on server side to decide
 611                                 // whether to send application/json or application/xml?
 612                                 $.getJSON( requrl, reqparam, function (data) {
 613                                         mybuttons.button("enable");
 614                                         if( 'jobid' in data ) {
 615                                                 // There is a pending job.
 616                                                 selectedTextInfo.stemweb_jobid = data.jobid;
 617                                                 $('#stemweb_run_status').empty().append(
 618                                                         _make_message( 'notification', "Your request has been submitted to Stemweb.\nThe resulting tree will appear in due course." ) );
 619                                                 // Reload the current stemma to rejigger the buttons
 620                                                 switch_stemweb_ui();
 621                                         } else {
 622                                                 // We appear to have an answer; process it.
 623                                                 process_stemweb_result( data );
 624                                         }
 625                                 }, 'json' );
 626                                 },
 627                         },
 628                         Close: {
 629                                 id: 'stemweb_close_button',
 630                                 text: 'Close',
 631                                 click: function() {
 632                                         $('#stemweb-ui-dialog').dialog('close');
 633                                         switch_stemweb_ui();
 634                                 },
 635                         },
 636                 },
 637                 create: function(evt) {
 638                         // Call out to Stemweb to get the algorithm options, with which we
 639                         // populate the form.
 640                         var algorithmTypes = {};
 641                         var algorithmArgs = {};
 642                         var requrl = _get_url([ "stemweb", "available" ]);
 643                         $.getJSON( requrl, function( data ) {
 644                                 $.each( data, function( i, o ) {
 645                                         if( o.model === 'algorithms.algorithm' ) {
 646                                                 // it's an algorithm.
 647                                                 algorithmTypes[ o.pk ] = o.fields;
 648                                         } else if( o.model == 'algorithms.algorithmarg' && o.fields.external ) {
 649                                                 // it's an option for an algorithm that we should display.
 650                                                 algorithmArgs[ o.pk ] = o.fields;
 651                                         }
 652                                 });
 653                                 // TODO if it is an empty object, disable Stemweb entirely.
 654                                 if( !jQuery.isEmptyObject( algorithmTypes ) ) {
 655                                         $.each( algorithmTypes, function( pk, fields ) {
 656                                                 var algopt = $('<option>').attr( 'value', pk ).append( fields.name );
 657                                                 $('#stemweb_algorithm').append( algopt );
 658                                         });
 659                                         // Set up the relevant options for whichever algorithm is chosen.
 660                                         // "key" -> form name, option ID "stemweb_$key_opt"
 661                                         // "name" -> form label
 662                                         $('#stemweb_algorithm_help').click( function() {
 663                                                 $('#stemweb_algorithm_desc_text').toggle( 'blind' );
 664                                                 });
 665                                         $('#stemweb_algorithm').change( function() {
 666                                                 var pk = $(this).val();
 667                                                 // Display a link to the popup description, and fill in
 668                                                 // the description itself, if we have one.
 669                                                 if( 'desc' in algorithmTypes[pk] ) {
 670                                                         $('#stemweb_algorithm_desc_text').empty().append( algorithmTypes[pk].desc );
 671                                                         $('#stemweb_algorithm_desc').show();
 672                                                 } else {
 673                                                         $('#stemweb_algorithm_desc').hide();
 674                                                 }
 675                                                 $('#stemweb_runtime_options').empty();
 676                                                 $.each( algorithmTypes[pk].args, function( i, apk ) {
 677                                                         var argInfo = algorithmArgs[apk];
 678                                                         if( argInfo ) {
 679                                                                 // Make the element ID
 680                                                                 var optId = 'stemweb_' + argInfo.key + '_opt';
 681                                                                 // Make the label
 682                                                                 var optLabel = $('<label>').attr( 'for', optId )
 683                                                                         .append( argInfo.name + ": " );
 684                                                                 var optCtrl;
 685                                                                 var argType = argInfo.value;
 686                                                                 if( argType === 'positive_integer' ) {
 687                                                                         // Make it an input field of smallish size.
 688                                                                         optCtrl = $('<input>').attr( 'size', 4 );
 689                                                                 } else if ( argType === 'boolean' ) {
 690                                                                         // Make it a checkbox.
 691                                                                         optCtrl = $('<checkbox>');
 692                                                                 }
 693                                                                 // Add the name and element ID
 694                                                                 optCtrl.attr( 'name', argInfo.key ).attr( 'id', optId );
 695                                                                 // Append the label and the option itself to the form.
 696                                                                 $('#stemweb_runtime_options').append( optLabel )
 697                                                                         .append( optCtrl ).append( $('<br>') );
 698                                                         }
 699                                                 });
 700                                         });
 701                                         $('#stemweb_algorithm').change();
 702                                 }
 703                         });
 704                         // Prime the initial options
 705                 },
 706                 open: function(evt) {
 707                         $('#stemweb_run_status').empty();
 708                         $('#stemweb_tradition').attr('value', selectedTextID );
 709                         if( selectedTextInfo.stemweb_jobid == 0 ) {
 710                                 $('#stemweb_merge_reltypes').empty();
 711                                 $.each( selectedTextInfo.reltypes, function( i, r ) {
 712                                         var relation_opt = $('<option>').attr( 'value', r ).append( r );
 713                                         $('#stemweb_merge_reltypes').append( relation_opt );
 714                                 });
 715                                 $('#stemweb_merge_reltypes').multiselect({
 716                                         header: false,
 717                                         selectedList: 3
 718                                 });
 719                         }
 720                 },
 721         }).ajaxError( function(event, jqXHR, ajaxSettings, thrownError) {
 722                 $(event.target).parent().find('.ui-button').button("enable");
 723         if( ajaxSettings.url.indexOf( 'stemweb/' ) > -1 ) {
 724                         display_error( jqXHR, $("#stemweb_run_status") );
 725         }
 726         });
 727
 728         // Set up the download dialog
 729         $('#download-dialog').dialog({
 730                 autoOpen: false,
 731                 height: 150,
 732                 width: 300,
 733                 modal: true,
 734                 buttons: {
 735                         Download: function (evt) {
 736                                 var dlurl = _get_url([ "download", $('#download_tradition').val(), $('#download_format').val() ]);
 737                                 window.location = dlurl;
 738                         },
 739                         Done: function() {
 740                                 $('#download-dialog').dialog('close');
 741                         }
 742                 },
 743                 open: function() {
 744                         $('#download_tradition').attr('value', selectedTextID );
 745                 },
 746         }).ajaxError( function(event, jqXHR, ajaxSettings, thrownError) {
 747                 $(event.target).parent().find('.ui-button').button("enable");
 748         if( ajaxSettings.url.indexOf( 'download' ) > -1
 749                 && ajaxSettings.type == 'POST' ) {
 750                         display_error( jqXHR, $("#download_status") );
 751         }
 752         });
 753
 754         $('#upload-collation-dialog').dialog({
 755                 autoOpen: false,
 756                 height: 360,
 757                 width: 480,
 758                 modal: true,
 759                 buttons: {
 760                   upload: {
 761                     text: 'Upload',
 762                     id: 'upload_button',
 763                     click: function() {
 764                             $('#upload_status').empty();
 765                             $('#upload_button').button("disable");
 766                 upload_new();
 767             }
 768                   },
 769                   pick_file: {
 770                     text: 'Pick File',
 771                     id: 'pick_file_button',
 772                     click: function() {
 773                 $('#new_file').click();
 774             }
 775                   },
 776                   Cancel: function() {
 777                     $('#upload-collation-dialog').dialog('close');
 778                   }
 779                 },
 780                 open: function() {
 781                         // Set the upload button to its correct state based on
 782                         // whether a file is loaded
 783                         file_selected( $('#new_file').get(0) );
 784                         $('#upload_status').empty();
 785                 }
 786         }).ajaxError( function(event, jqXHR, ajaxSettings, thrownError) {
 787                 // Reset button state
 788                 file_selected( $('#new_file').get(0) );
 789                 // Display error message if applicable
 790         if( ajaxSettings.url.indexOf( 'newtradition' ) > -1
 791                 && ajaxSettings.type == 'POST' ) {
 792                         display_error( jqXHR, $("#upload_status") );
 793         }
 794         });;
 795
 796         $('#stemma_graph').mousedown( function(evt) {
 797         evt.stopPropagation();
 798         $('#stemma_graph').data( 'mousedown_xy', [evt.clientX, evt.clientY] );
 799         $('body').mousemove( function(evt) {
 800             mouse_scale = 1; // for now, was:  mouse_scale = svg_root_element.getScreenCTM().a;
 801             dx = (evt.clientX - $('#stemma_graph').data( 'mousedown_xy' )[0]) / mouse_scale;
 802             dy = (evt.clientY - $('#stemma_graph').data( 'mousedown_xy' )[1]) / mouse_scale;
 803             $('#stemma_graph').data( 'mousedown_xy', [evt.clientX, evt.clientY] );
 804             var svg_root = $('#stemma_graph svg').svg().svg('get').root();
 805             var g = $('g.graph', svg_root).get(0);
 806             current_translate = g.getAttribute( 'transform' ).split(/translate\(/)[1].split(')',1)[0].split(' ');
 807             new_transform = g.getAttribute( 'transform' ).replace( /translate\([^\)]*\)/, 'translate(' + (parseFloat(current_translate[0]) + dx) + ' ' + (parseFloat(current_translate[1]) + dy) + ')' );
 808             g.setAttribute( 'transform', new_transform );
 809             evt.returnValue = false;
 810             evt.preventDefault();
 811             return false;
 812         });
 813         $('body').mouseup( function(evt) {
 814             $('body').unbind('mousemove');
 815             $('body').unbind('mouseup');
 816         });
 817         });
 818
 819         $('#stemma_graph').mousewheel(function (event, delta) {
 820         event.returnValue = false;
 821         event.preventDefault();
 822         if (!delta || delta == null || delta == 0) delta = event.originalEvent.wheelDelta;
 823         if (!delta || delta == null || delta == 0) delta = -1 * event.originalEvent.detail;
 824         if( delta < -9 ) { delta = -9 };
 825         var z = 1 + delta/10;
 826         z = delta > 0 ? 1 : -1;
 827         var svg_root = $('#stemma_graph svg').svg().svg('get').root();
 828         var g = $('g.graph', svg_root).get(0);
 829         if (g && ((z<1 && (g.getScreenCTM().a * start_element_height) > 4.0) || (z>=1 && (g.getScreenCTM().a * start_element_height) < 1000))) {
 830             var scaleLevel = z/10;
 831             current_scale = parseFloat( g.getAttribute( 'transform' ).split(/scale\(/)[1].split(')',1)[0].split(' ')[0] );
 832             new_transform = g.getAttribute( 'transform' ).replace( /scale\([^\)]*\)/, 'scale(' + (current_scale + scaleLevel) + ')' );
 833             g.setAttribute( 'transform', new_transform );
 834         }
 835     });
 836
 837 });