1 /* 2 Copyright 2008-2022 3 Matthias Ehmann, 4 Michael Gerhaeuser, 5 Carsten Miller, 6 Bianca Valentin, 7 Alfred Wassermann, 8 Peter Wilfahrt 9 10 This file is part of JSXGraph. 11 12 JSXGraph is free software dual licensed under the GNU LGPL or MIT License. 13 14 You can redistribute it and/or modify it under the terms of the 15 16 * GNU Lesser General Public License as published by 17 the Free Software Foundation, either version 3 of the License, or 18 (at your option) any later version 19 OR 20 * MIT License: https://github.com/jsxgraph/jsxgraph/blob/master/LICENSE.MIT 21 22 JSXGraph is distributed in the hope that it will be useful, 23 but WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 GNU Lesser General Public License for more details. 26 27 You should have received a copy of the GNU Lesser General Public License and 28 the MIT License along with JSXGraph. If not, see <http://www.gnu.org/licenses/> 29 and <http://opensource.org/licenses/MIT/>. 30 */ 31 32 33 /*global JXG: true, document:true, jQuery:true, define: true, window: true*/ 34 /*jslint nomen: true, plusplus: true*/ 35 36 /* depends: 37 jxg 38 utils/env 39 utils/type 40 base/board 41 reader/file 42 options 43 renderer/svg 44 renderer/vml 45 renderer/canvas 46 renderer/no 47 */ 48 49 /** 50 * @fileoverview The JSXGraph object is defined in this file. JXG.JSXGraph controls all boards. 51 * It has methods to create, save, load and free boards. Additionally some helper functions are 52 * defined in this file directly in the JXG namespace. 53 * @version 0.99 54 */ 55 56 define([ 57 'jxg', 'utils/env', 'utils/type', 'base/board', 'reader/file', 'options', 58 'renderer/svg', 'renderer/vml', 'renderer/canvas', 'renderer/no' 59 ], function (JXG, Env, Type, Board, FileReader, Options, SVGRenderer, VMLRenderer, CanvasRenderer, NoRenderer) { 60 61 "use strict"; 62 63 /** 64 * Constructs a new JSXGraph singleton object. 65 * @class The JXG.JSXGraph singleton stores all properties required 66 * to load, save, create and free a board. 67 */ 68 JXG.JSXGraph = { 69 /** 70 * Stores the renderer that is used to draw the boards. 71 * @type String 72 */ 73 rendererType: (function () { 74 Options.board.renderer = 'no'; 75 76 if (Env.supportsVML()) { 77 Options.board.renderer = 'vml'; 78 // Ok, this is some real magic going on here. IE/VML always was so 79 // terribly slow, except in one place: Examples placed in a moodle course 80 // was almost as fast as in other browsers. So i grabbed all the css and 81 // lib scripts from our moodle, added them to a jsxgraph example and it 82 // worked. next step was to strip all the css/lib code which didn't affect 83 // the VML update speed. The following five lines are what was left after 84 // the last step and yes - it basically does nothing but reads two 85 // properties of document.body on every mouse move. why? we don't know. if 86 // you know, please let us know. 87 // 88 // If we want to use the strict mode we have to refactor this a little bit. Let's 89 // hope the magic isn't gone now. Anywho... it's only useful in old versions of IE 90 // which should not be used anymore. 91 document.onmousemove = function () { 92 var t; 93 94 if (document.body) { 95 t = document.body.scrollLeft; 96 t += document.body.scrollTop; 97 } 98 99 return t; 100 }; 101 } 102 103 if (Env.supportsCanvas()) { 104 Options.board.renderer = 'canvas'; 105 } 106 107 if (Env.supportsSVG()) { 108 Options.board.renderer = 'svg'; 109 } 110 111 // we are inside node 112 if (Env.isNode() && Env.supportsCanvas()) { 113 Options.board.renderer = 'canvas'; 114 } 115 116 if (Env.isNode() || Options.renderer === 'no') { 117 Options.text.display = 'internal'; 118 Options.infobox.display = 'internal'; 119 } 120 121 return Options.board.renderer; 122 }()), 123 124 /** 125 * Initialize the rendering engine 126 * 127 * @param {String} box HTML id of the div-element which hosts the JSXGraph construction 128 * @param {Object} dim The dimensions of the board 129 * @param {Object} doc Usually, this is document object of the browser window. If false or null, this defaults 130 * to the document object of the browser. 131 * @param {Object} attrRenderer Attribute 'renderer', speficies the rendering engine. Possible values are 'auto', 'svg', 132 * 'canvas', 'no', and 'vml'. 133 * @returns {Object} Reference to the rendering engine object. 134 * @private 135 */ 136 initRenderer: function (box, dim, doc, attrRenderer) { 137 var boxid, renderer; 138 139 // Former version: 140 // doc = doc || document 141 if ((!Type.exists(doc) || doc === false) && typeof document === 'object') { 142 doc = document; 143 } 144 145 if (typeof doc === 'object' && box !== null) { 146 boxid = doc.getElementById(box); 147 148 // Remove everything from the container before initializing the renderer and the board 149 while (boxid.firstChild) { 150 boxid.removeChild(boxid.firstChild); 151 } 152 } else { 153 boxid = box; 154 } 155 156 // If attrRenderer is not supplied take the first available renderer 157 if (attrRenderer === undefined || attrRenderer === 'auto') { 158 attrRenderer = this.rendererType; 159 } 160 // create the renderer 161 if (attrRenderer === 'svg') { 162 renderer = new SVGRenderer(boxid, dim); 163 } else if (attrRenderer === 'vml') { 164 renderer = new VMLRenderer(boxid); 165 } else if (attrRenderer === 'canvas') { 166 renderer = new CanvasRenderer(boxid, dim); 167 } else { 168 renderer = new NoRenderer(); 169 } 170 171 return renderer; 172 }, 173 174 /** 175 * Merge the user supplied attributes with the attributes in options.js 176 * 177 * @param {Object} attributes User supplied attributes 178 * @returns {Object} Merged attributes for the board 179 * 180 * @private 181 */ 182 _setAttributes: function(attributes) { 183 // merge attributes 184 var attr = Type.copyAttributes(attributes, Options, 'board'); 185 186 // The attributes which are objects have to be copied separately 187 attr.zoom = Type.copyAttributes(attr, Options, 'board', 'zoom'); 188 attr.pan = Type.copyAttributes(attr, Options, 'board', 'pan'); 189 attr.drag = Type.copyAttributes(attr, Options, 'board', 'drag'); 190 attr.keyboard = Type.copyAttributes(attr, Options, 'board', 'keyboard'); 191 attr.selection = Type.copyAttributes(attr, Options, 'board', 'selection'); 192 attr.navbar = Type.copyAttributes(attr.navbar, Options, 'navbar'); 193 attr.screenshot = Type.copyAttributes(attr, Options, 'board', 'screenshot'); 194 attr.resize = Type.copyAttributes(attr, Options, 'board', 'resize'); 195 attr.fullscreen = Type.copyAttributes(attr, Options, 'board', 'fullscreen'); 196 197 // Treat moveTarget separately, because deepCopy will not work here. 198 // Reason: moveTarget will be an HTML node and it is prevented that Type.deepCopy will copy it. 199 attr.movetarget = attributes.moveTarget || attributes.movetarget || Options.board.moveTarget; 200 201 return attr; 202 }, 203 204 /** 205 * Further initialization of the board. Set some properties from attribute values. 206 * 207 * @param {JXG.Board} board 208 * @param {Object} attr attributes object 209 * @param {Object} dimensions Object containing dimensions of the canvas 210 * 211 * @private 212 */ 213 _fillBoard: function(board, attr, dimensions) { 214 board.initInfobox(); 215 board.maxboundingbox = attr.maxboundingbox; 216 board.resizeContainer(dimensions.width, dimensions.height, true, true); 217 board._createSelectionPolygon(attr); 218 board.renderer.drawZoomBar(board, attr.navbar); 219 JXG.boards[board.id] = board; 220 }, 221 222 /** 223 * 224 * @param {String} container HTML-ID to the HTML-element in which the board is painted. 225 * @param {*} attr An object that sets some of the board properties. 226 * 227 * @private 228 */ 229 _setARIA: function(container, attr) { 230 var doc = attr.document || document, 231 node_jsx, newNode, parent, 232 id_label, id_description; 233 234 if (typeof doc !== 'object') { 235 return; 236 } 237 238 node_jsx = doc.getElementById(container); 239 parent = node_jsx.parentNode; 240 241 id_label = container + '_ARIAlabel'; 242 id_description = container + '_ARIAdescription'; 243 244 newNode = doc.createElement('div'); 245 newNode.innerHTML = attr.title; 246 newNode.setAttribute('id', id_label); 247 newNode.style.display = 'none'; 248 parent.insertBefore(newNode, node_jsx); 249 250 newNode = doc.createElement('div'); 251 newNode.innerHTML = attr.description; 252 newNode.setAttribute('id', id_description); 253 newNode.style.display = 'none'; 254 parent.insertBefore(newNode, node_jsx); 255 256 node_jsx.setAttribute('aria-labelledby', id_label); 257 node_jsx.setAttribute('aria-describedby', id_description); 258 }, 259 260 /** 261 * Remove the two corresponding ARIA divs when freeing a board 262 * 263 * @param {JXG.Board} board 264 * 265 * @private 266 */ 267 _removeARIANodes: function(board) { 268 var node, id, doc; 269 270 doc = board.document || document; 271 if (typeof doc !== 'object') { 272 return; 273 } 274 275 id = board.containerObj.getAttribute('aria-labelledby'); 276 node = document.getElementById(id); 277 if (node && node.parentNode) { 278 node.parentNode.removeChild(node); 279 } 280 id = board.containerObj.getAttribute('aria-describedby'); 281 node = document.getElementById(id); 282 if (node && node.parentNode) { 283 node.parentNode.removeChild(node); 284 } 285 }, 286 287 /** 288 * Initialise a new board. 289 * @param {String} box HTML-ID to the HTML-element in which the board is painted. 290 * @param {Object} attributes An object that sets some of the board properties. Most of these properties can be set via JXG.Options. 291 * @param {Array} [attributes.boundingbox=[-5, 5, 5, -5]] An array containing four numbers describing the left, top, right and bottom boundary of the board in user coordinates 292 * @param {Boolean} [attributes.keepaspectratio=false] If <tt>true</tt>, the bounding box is adjusted to the same aspect ratio as the aspect ratio of the div containing the board. 293 * @param {Boolean} [attributes.showCopyright=false] Show the copyright string in the top left corner. 294 * @param {Boolean} [attributes.showNavigation=false] Show the navigation buttons in the bottom right corner. 295 * @param {Object} [attributes.zoom] Allow the user to zoom with the mouse wheel or the two-fingers-zoom gesture. 296 * @param {Object} [attributes.pan] Allow the user to pan with shift+drag mouse or two-fingers-pan gesture. 297 * @param {Object} [attributes.drag] Allow the user to drag objects with a pointer device. 298 * @param {Object} [attributes.keyboard] Allow the user to drag objects with arrow keys on keyboard. 299 * @param {Boolean} [attributes.axis=false] If set to true, show the axis. Can also be set to an object that is given to both axes as an attribute object. 300 * @param {Boolean|Object} [attributes.grid] If set to true, shows the grid. Can also be set to an object that is given to the grid as its attribute object. 301 * @param {Boolean} [attributes.registerEvents=true] Register mouse / touch events. 302 * @returns {JXG.Board} Reference to the created board. 303 */ 304 initBoard: function (box, attributes) { 305 var originX, originY, unitX, unitY, 306 renderer, 307 offX = 0, 308 offY = 0, 309 w, h, dimensions, 310 bbox, attr, axattr, axattr_x, axattr_y, 311 board; 312 313 attributes = attributes || {}; 314 attr = this._setAttributes(attributes); 315 316 dimensions = Env.getDimensions(box, attr.document); 317 318 if (attr.unitx || attr.unity) { 319 originX = Type.def(attr.originx, 150); 320 originY = Type.def(attr.originy, 150); 321 unitX = Type.def(attr.unitx, 50); 322 unitY = Type.def(attr.unity, 50); 323 } else { 324 bbox = attr.boundingbox; 325 if (bbox[0] < attr.maxboundingbox[0]) { bbox[0] = attr.maxboundingbox[0]; } 326 if (bbox[1] > attr.maxboundingbox[1]) { bbox[1] = attr.maxboundingbox[1]; } 327 if (bbox[2] > attr.maxboundingbox[2]) { bbox[2] = attr.maxboundingbox[2]; } 328 if (bbox[3] < attr.maxboundingbox[3]) { bbox[3] = attr.maxboundingbox[3]; } 329 330 w = parseInt(dimensions.width, 10); 331 h = parseInt(dimensions.height, 10); 332 333 if (Type.exists(bbox) && attr.keepaspectratio) { 334 /* 335 * If the boundingbox attribute is given and the ratio of height and width of the 336 * sides defined by the bounding box and the ratio of the dimensions of the div tag 337 * which contains the board do not coincide, then the smaller side is chosen. 338 */ 339 unitX = w / (bbox[2] - bbox[0]); 340 unitY = h / (bbox[1] - bbox[3]); 341 342 if (Math.abs(unitX) < Math.abs(unitY)) { 343 unitY = Math.abs(unitX) * unitY / Math.abs(unitY); 344 // Add the additional units in equal portions above and below 345 offY = (h / unitY - (bbox[1] - bbox[3])) * 0.5; 346 } else { 347 unitX = Math.abs(unitY) * unitX / Math.abs(unitX); 348 // Add the additional units in equal portions left and right 349 offX = (w / unitX - (bbox[2] - bbox[0])) * 0.5; 350 } 351 } else { 352 unitX = w / (bbox[2] - bbox[0]); 353 unitY = h / (bbox[1] - bbox[3]); 354 } 355 originX = -unitX * (bbox[0] - offX); 356 originY = unitY * (bbox[1] + offY); 357 } 358 359 renderer = this.initRenderer(box, dimensions, attr.document, attr.renderer); 360 this._setARIA(box, attr); 361 362 // create the board 363 board = new Board(box, renderer, attr.id, [originX, originY], 364 attr.zoomfactor * attr.zoomx, 365 attr.zoomfactor * attr.zoomy, 366 unitX, unitY, 367 dimensions.width, dimensions.height, 368 attr); 369 370 board.keepaspectratio = attr.keepaspectratio; 371 372 this._fillBoard(board, attr, dimensions); 373 374 // create elements like axes, grid, navigation, ... 375 board.suspendUpdate(); 376 if (attr.axis) { 377 axattr = typeof attr.axis === 'object' ? attr.axis : {}; 378 379 // The defaultAxes attributes are overwritten by user supplied axis object. 380 axattr_x = Type.deepCopy(Options.board.defaultAxes.x, axattr); 381 axattr_y = Type.deepCopy(Options.board.defaultAxes.y, axattr); 382 // The user supplied defaultAxes attributes are merged in. 383 if (attr.defaultaxes.x) { 384 axattr_x = Type.deepCopy(axattr_x, attr.defaultaxes.x); 385 } 386 if (attr.defaultaxes.y) { 387 axattr_y = Type.deepCopy(axattr_y, attr.defaultaxes.y); 388 } 389 390 board.defaultAxes = {}; 391 board.defaultAxes.x = board.create('axis', [[0, 0], [1, 0]], axattr_x); 392 board.defaultAxes.y = board.create('axis', [[0, 0], [0, 1]], axattr_y); 393 } 394 if (attr.grid) { 395 board.create('grid', [], (typeof attr.grid === 'object' ? attr.grid : {})); 396 } 397 board.unsuspendUpdate(); 398 399 return board; 400 }, 401 402 /** 403 * Load a board from a file containing a construction made with either GEONExT, 404 * Intergeo, Geogebra, or Cinderella. 405 * @param {String} box HTML-ID to the HTML-element in which the board is painted. 406 * @param {String} file base64 encoded string. 407 * @param {String} format containing the file format: 'Geonext' or 'Intergeo'. 408 * @param {Object} attributes Attributes for the board and 'encoding'. 409 * Compressed files need encoding 'iso-8859-1'. Otherwise it probably is 'utf-8'. 410 * @param {Function} callback 411 * @returns {JXG.Board} Reference to the created board. 412 * @see JXG.FileReader 413 * @see JXG.GeonextReader 414 * @see JXG.GeogebraReader 415 * @see JXG.IntergeoReader 416 * @see JXG.CinderellaReader 417 * 418 * @example 419 * // Uncompressed file 420 * var board = JXG.JSXGraph.loadBoardFromFile('jxgbox', 'filename', 'geonext', 421 * {encoding: 'utf-8'}, 422 * function (board) { console.log("Done loading"); } 423 * ); 424 * // Compressed file 425 * var board = JXG.JSXGraph.loadBoardFromFile('jxgbox', 'filename', 'geonext', 426 * {encoding: 'iso-8859-1'}, 427 * function (board) { console.log("Done loading"); } 428 * ); 429 * 430 * @example 431 * // From <input type="file" id="localfile" /> 432 * var file = document.getElementById('localfile').files[0]; 433 * JXG.JSXGraph.loadBoardFromFile('jxgbox', file, 'geonext', 434 * {encoding: 'utf-8'}, 435 * function (board) { console.log("Done loading"); } 436 * ); 437 */ 438 loadBoardFromFile: function (box, file, format, attributes, callback) { 439 var attr, renderer, board, dimensions, encoding; 440 441 attributes = attributes || {}; 442 attr = this._setAttributes(attributes); 443 444 dimensions = Env.getDimensions(box, attr.document); 445 renderer = this.initRenderer(box, dimensions, attr.document, attr.renderer); 446 this._setARIA(box, attr); 447 448 /* User default parameters, in parse* the values in the gxt files are submitted to board */ 449 board = new Board(box, renderer, '', [150, 150], 1, 1, 50, 50, dimensions.width, dimensions.height, attr); 450 this._fillBoard(board, attr, dimensions); 451 encoding = attr.encoding || 'iso-8859-1'; 452 FileReader.parseFileContent(file, board, format, true, encoding, callback); 453 454 return board; 455 }, 456 457 /** 458 * Load a board from a base64 encoded string containing a construction made with either GEONExT, 459 * Intergeo, Geogebra, or Cinderella. 460 * @param {String} box HTML-ID to the HTML-element in which the board is painted. 461 * @param {String} string base64 encoded string. 462 * @param {String} format containing the file format: 'Geonext', 'Intergeo', 'Geogebra'. 463 * @param {Object} attributes Attributes for the board and 'encoding'. 464 * Compressed files need encoding 'iso-8859-1'. Otherwise it probably is 'utf-8'. 465 * @param {Function} callback 466 * @returns {JXG.Board} Reference to the created board. 467 * @see JXG.FileReader 468 * @see JXG.GeonextReader 469 * @see JXG.GeogebraReader 470 * @see JXG.IntergeoReader 471 * @see JXG.CinderellaReader 472 */ 473 loadBoardFromString: function (box, string, format, attributes, callback) { 474 var attr, renderer, board, dimensions; 475 476 attributes = attributes || {}; 477 attr = this._setAttributes(attributes); 478 479 dimensions = Env.getDimensions(box, attr.document); 480 renderer = this.initRenderer(box, dimensions, attr.document); 481 this._setARIA(box, attr); 482 483 /* User default parameters, in parse* the values in the gxt files are submitted to board */ 484 board = new Board(box, renderer, '', [150, 150], 1.0, 1.0, 50, 50, dimensions.width, dimensions.height, attr); 485 this._fillBoard(board, attr, dimensions); 486 FileReader.parseString(string, board, format, true, callback); 487 488 return board; 489 }, 490 491 /** 492 * Delete a board and all its contents. 493 * @param {JXG.Board,String} board HTML-ID to the DOM-element in which the board is drawn. 494 */ 495 freeBoard: function (board) { 496 var el; 497 498 if (typeof board === 'string') { 499 board = JXG.boards[board]; 500 } 501 502 this._removeARIANodes(board); 503 board.removeEventHandlers(); 504 board.suspendUpdate(); 505 506 // Remove all objects from the board. 507 for (el in board.objects) { 508 if (board.objects.hasOwnProperty(el)) { 509 board.objects[el].remove(); 510 } 511 } 512 513 // Remove all the other things, left on the board, XHTML save 514 while (board.containerObj.firstChild) { 515 board.containerObj.removeChild(board.containerObj.firstChild); 516 } 517 518 // Tell the browser the objects aren't needed anymore 519 for (el in board.objects) { 520 if (board.objects.hasOwnProperty(el)) { 521 delete board.objects[el]; 522 } 523 } 524 525 // Free the renderer and the algebra object 526 delete board.renderer; 527 528 // clear the creator cache 529 board.jc.creator.clearCache(); 530 delete board.jc; 531 532 // Finally remove the board itself from the boards array 533 delete JXG.boards[board.id]; 534 }, 535 536 /** 537 * @deprecated Use JXG#registerElement 538 * @param element 539 * @param creator 540 */ 541 registerElement: function (element, creator) { 542 JXG.deprecated('JXG.JSXGraph.registerElement()', 'JXG.registerElement()'); 543 JXG.registerElement(element, creator); 544 } 545 }; 546 547 // JessieScript/JessieCode startup: Search for script tags of type text/jessiescript and interprete them. 548 if (Env.isBrowser && typeof window === 'object' && typeof document === 'object') { 549 Env.addEvent(window, 'load', function () { 550 var type, i, j, div, 551 id, board, txt, 552 width, height, maxWidth, aspectRatio, cssClasses, 553 bbox, axis, grid, code, 554 src, request, postpone = false, 555 scripts = document.getElementsByTagName('script'), 556 init = function (code, type, bbox) { 557 var board = JXG.JSXGraph.initBoard(id, {boundingbox: bbox, keepaspectratio: true, grid: grid, axis: axis, showReload: true}); 558 559 if (type.toLowerCase().indexOf('script') > -1) { 560 board.construct(code); 561 } else { 562 try { 563 board.jc.parse(code); 564 } catch (e2) { 565 JXG.debug(e2); 566 } 567 } 568 569 return board; 570 }, 571 makeReload = function (board, code, type, bbox) { 572 return function () { 573 var newBoard; 574 575 JXG.JSXGraph.freeBoard(board); 576 newBoard = init(code, type, bbox); 577 newBoard.reload = makeReload(newBoard, code, type, bbox); 578 }; 579 }; 580 581 for (i = 0; i < scripts.length; i++) { 582 type = scripts[i].getAttribute('type', false); 583 584 if (Type.exists(type) && 585 (type.toLowerCase() === 'text/jessiescript' || type.toLowerCase() === 'jessiescript' || 586 type.toLowerCase() === 'text/jessiecode' || type.toLowerCase() === 'jessiecode')) { 587 cssClasses = scripts[i].getAttribute('class', false) || ''; 588 width = scripts[i].getAttribute('width', false) || ''; 589 height = scripts[i].getAttribute('height', false) || ''; 590 maxWidth = scripts[i].getAttribute('maxwidth', false) || '100%'; 591 aspectRatio = scripts[i].getAttribute('aspectratio', false) || '1/1'; 592 bbox = scripts[i].getAttribute('boundingbox', false) || '-5, 5, 5, -5'; 593 id = scripts[i].getAttribute('container', false); 594 src = scripts[i].getAttribute('src', false); 595 596 bbox = bbox.split(','); 597 if (bbox.length !== 4) { 598 bbox = [-5, 5, 5, -5]; 599 } else { 600 for (j = 0; j < bbox.length; j++) { 601 bbox[j] = parseFloat(bbox[j]); 602 } 603 } 604 axis = Type.str2Bool(scripts[i].getAttribute('axis', false) || 'false'); 605 grid = Type.str2Bool(scripts[i].getAttribute('grid', false) || 'false'); 606 607 if (!Type.exists(id)) { 608 id = 'jessiescript_autgen_jxg_' + i; 609 div = document.createElement('div'); 610 div.setAttribute('id', id); 611 612 txt = (width !== '') ? ('width:' + width + ';') : ''; 613 txt += (height !== '') ? ('height:' + height + ';') : ''; 614 txt += (maxWidth !== '') ? ('max-width:' + maxWidth + ';') : ''; 615 txt += (aspectRatio !== '') ? ('aspect-ratio:' + aspectRatio + ';') : ''; 616 617 div.setAttribute('style', txt); 618 div.setAttribute('class', 'jxgbox ' + cssClasses); 619 try { 620 document.body.insertBefore(div, scripts[i]); 621 } catch (e) { 622 // there's probably jquery involved... 623 if (typeof jQuery === 'object') { 624 jQuery(div).insertBefore(scripts[i]); 625 } 626 } 627 } else { 628 div = document.getElementById(id); 629 } 630 631 code = ''; 632 633 if (Type.exists(src)) { 634 postpone = true; 635 request = new XMLHttpRequest(); 636 request.open("GET", src); 637 request.overrideMimeType("text/plain; charset=x-user-defined"); 638 /* jshint ignore:start */ 639 request.addEventListener("load", function() { 640 if (this.status < 400) { 641 code = this.responseText + '\n' + code; 642 board = init(code, type, bbox); 643 board.reload = makeReload(board, code, type, bbox); 644 } else { 645 throw new Error("\nJSXGraph: failed to load file", src, ":", this.responseText); 646 } 647 }); 648 request.addEventListener("error", function(e) { 649 throw new Error("\nJSXGraph: failed to load file", src, ":", e); 650 }); 651 /* jshint ignore:end */ 652 request.send(); 653 } else { 654 postpone = false; 655 } 656 657 if (document.getElementById(id)) { 658 code = scripts[i].innerHTML; 659 code = code.replace(/<!\[CDATA\[/g, '').replace(/\]\]>/g, ''); 660 scripts[i].innerHTML = code; 661 662 if (!postpone) { 663 // Do no wait for data from "src" attribute 664 board = init(code, type, bbox); 665 board.reload = makeReload(board, code, type, bbox); 666 } 667 } else { 668 JXG.debug('JSXGraph: Apparently the div injection failed. Can\'t create a board, sorry.'); 669 } 670 } 671 } 672 }, window); 673 } 674 675 return JXG.JSXGraph; 676 }); 677