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{"version":3,"file":"ddwtos.min.js","sources":["../src/ddwtos.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * JavaScript to make drag-drop into text questions work.\n *\n * Some vocabulary to help understand this code:\n *\n * The question text contains 'drops' - blanks into which the 'drags', the missing\n * words, can be put.\n *\n * The thing that can be moved into the drops are called 'drags'. There may be\n * multiple copies of the 'same' drag which does not really cause problems.\n * Each drag has a 'choice' number which is the value set on the drop's hidden\n * input when this drag is placed in a drop.\n *\n * These may be in separate 'groups', distinguished by colour.\n * Things can only interact with other things in the same group.\n * The groups are numbered from 1.\n *\n * The place where a given drag started from is called its 'home'.\n *\n * @module qtype_ddwtos/ddwtos\n * @copyright 2018 The Open University\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n * @since 3.6\n */\ndefine([\n 'jquery',\n 'core/dragdrop',\n 'core/key_codes',\n 'core_form/changechecker'\n], function(\n $,\n dragDrop,\n keys,\n FormChangeChecker\n) {\n\n \"use strict\";\n\n /**\n * Object to handle one drag-drop into text question.\n *\n * @param {String} containerId id of the outer div for this question.\n * @param {boolean} readOnly whether the question is being displayed read-only.\n * @constructor\n */\n function DragDropToTextQuestion(containerId, readOnly) {\n this.containerId = containerId;\n this.questionAnswer = {};\n if (readOnly) {\n this.getRoot().addClass('qtype_ddwtos-readonly');\n }\n this.resizeAllDragsAndDrops();\n this.cloneDrags();\n this.positionDrags();\n }\n\n /**\n * In each group, resize all the items to be the same size.\n */\n DragDropToTextQuestion.prototype.resizeAllDragsAndDrops = function() {\n var thisQ = this;\n this.getRoot().find('.answercontainer > div').each(function(i, node) {\n thisQ.resizeAllDragsAndDropsInGroup(\n thisQ.getClassnameNumericSuffix($(node), 'draggrouphomes'));\n });\n };\n\n /**\n * In a given group, set all the drags and drops to be the same size.\n *\n * @param {int} groupthe group number.\n */\n DragDropToTextQuestion.prototype.resizeAllDragsAndDropsInGroup = function(group) {\n var thisQ = this,\n dragHomes = this.getRoot().find('.draggrouphomes' + group + ' span.draghome'),\n maxWidth = 0,\n maxHeight = 0;\n\n // Find the maximum size of any drag in this groups.\n dragHomes.each(function(i, drag) {\n maxWidth = Math.max(maxWidth, Math.ceil(drag.offsetWidth));\n maxHeight = Math.max(maxHeight, Math.ceil(0 + drag.offsetHeight));\n });\n\n // The size we will want to set is a bit bigger than this.\n maxWidth += 8;\n maxHeight += 2;\n\n // Set each drag home to that size.\n dragHomes.each(function(i, drag) {\n thisQ.setElementSize(drag, maxWidth, maxHeight);\n });\n\n // Set each drop to that size.\n this.getRoot().find('span.drop.group' + group).each(function(i, drop) {\n thisQ.setElementSize(drop, maxWidth, maxHeight);\n });\n };\n\n /**\n * Set a given DOM element to be a particular size.\n *\n * @param {HTMLElement} element\n * @param {int} width\n * @param {int} height\n */\n DragDropToTextQuestion.prototype.setElementSize = function(element, width, height) {\n $(element).width(width).height(height).css('lineHeight', height + 'px');\n };\n\n /**\n * Invisible 'drag homes' are output by the renderer. These have the same properties\n * as the drag items but are invisible. We clone these invisible elements to make the\n * actual drag items.\n */\n DragDropToTextQuestion.prototype.cloneDrags = function() {\n var thisQ = this;\n thisQ.getRoot().find('span.draghome').each(function(index, draghome) {\n var drag = $(draghome);\n var placeHolder = drag.clone();\n placeHolder.removeClass();\n placeHolder.addClass('draghome choice' +\n thisQ.getChoice(drag) + ' group' +\nthisQ.getGroup(drag) + ' dragplaceholder');\n drag.before(placeHolder);\n });\n };\n\n /**\n * Update the position of drags.\n */\n DragDropToTextQuestion.prototype.positionDrags = function() {\n var thisQ = this,\n root = this.getRoot();\n\n // First move all items back home.\n root.find('span.draghome').not('.dragplaceholder').each(function(i, dragNode) {\n var drag = $(dragNode),\n currentPlace = thisQ.getClassnameNumericSuffix(drag, 'inplace');\n drag.addClass('unplaced')\n .removeClass('placed');\n drag.removeAttr('tabindex');\n if (currentPlace !== null) {\n drag.removeClass('inplace' + currentPlace);\n }\n });\n\n // Then place the once that should be placed.\n root.find('input.placeinput').each(function(i, inputNode) {\n var input = $(inputNode),\n choice = input.val(),\nplace = thisQ.getPlace(input);\n\n // Record the last known position of the drop.\n var drop = root.find('.drop.place' + place),\n dropPosition = drop.offset();\n drop.data('prev-top', dropPosition.top).data('prev-left', dropPosition.left);\n\n if (choice === '0') {\n // No item in this place.\n return;\n }\n\n // Get the unplaced drag.\n var unplacedDrag = thisQ.getUnplacedChoice(thisQ.getGroup(input), choice);\n // Get the clone of the drag.\n var hiddenDrag = thisQ.getDragClone(unplacedDrag);\n if (hiddenDrag.length) {\n if (unplacedDrag.hasClass('infinite')) {\n var noOfDrags = thisQ.noOfDropsInGroup(thisQ.getGroup(unplacedDrag));\n var cloneDrags = thisQ.getInfiniteDragClones(unplacedDrag, false);\n if (cloneDrags.length < noOfDrags) {\n var cloneDrag= unplacedDrag.clone();\n hiddenDrag.after(cloneDrag);\n questionManager.addEventHandlersToDrag(cloneDrag);\n } else {\n hiddenDrag.addClass('active');\n }\n } else {\n hiddenDrag.addClass('active');\n }\n }\n // Send the drag to drop.\n thisQ.sendDragToDrop(thisQ.getUnplacedChoice(thisQ.getGroup(input), choice), drop);\n });\n\n // Save the question answer.\n thisQ.questionAnswer = thisQ.getQuestionAnsweredValues();\n };\n\n /**\n * Get the question answered values.\n *\n * @return {Object} Contain key-value with key is the input id and value is the input value.\n */\n DragDropToTextQuestion.prototype.getQuestionAnsweredValues = function() {\n let result = {};\n this.getRoot().find('input.placeinput').each((i, inputNode) => {\n result[inputNode.id] =inputNode.value;\n });\n\n return result;\n };\n\n /**\n * Check if the question is being interacted or not.\n *\n * @return {boolean} Return true if the user has changed the question-answer.\n */\n DragDropToTextQuestion.prototype.isQuestionInteracted = function() {\n const oldAnswer = this.questionAnswer;\n const newAnswer = this.getQuestionAnsweredValues();\n let isInteracted = false;\n\n // First, check both answers have the same structure or not.\n if (JSON.stringify(newAnswer) !== JSON.stringify(oldAnswer)) {\n isInteracted = true;\n return isInteracted;\n }\n // Check the values.\n Object.keys(newAnswer).forEach(key => {\n if (newAnswer[key] !== oldAnswer[key]) {\n isInteracted = true;\n }\n });\n\n return isInteracted;\n };\n\n /**\n * Handles the start of dragging an item.\n *\n * @param {Event} e the touch start ormouse down event.\n */\n DragDropToTextQuestion.prototype.handleDragStart = function(e) {\n var thisQ = this,\n drag = $(e.target).closest('.draghome');\n\n var info = dragDrop.prepare(e);\n if (!info.start || drag.hasClass('beingdragged')) {\n return;\n }\n\n drag.addClass('beingdragged');\n var currentPlace = this.getClassnameNumericSuffix(drag, 'inplace');\n if (currentPlace !== null) {\n this.setInputValue(currentPlace, 0);\n drag.removeClass('inplace' + currentPlace);\n var hiddenDrop = thisQ.getDrop(drag, currentPlace);\n if (hiddenDrop.length) {\n hiddenDrop.addClass('active');\n drag.offset(hiddenDrop.offset());\n }\n } else {\n var hiddenDrag = thisQ.getDragClone(drag);\n if (hiddenDrag.length) {\n if (drag.hasClass('infinite')) {\n var noOfDrags = this.noOfDropsInGroup(this.getGroup(drag));\n var cloneDrags = this.getInfiniteDragClones(drag, false);\n if (cloneDrags.length < noOfDrags) {\n var cloneDrag = drag.clone();\n cloneDrag.removeClass('beingdragged');\n hiddenDrag.after(cloneDrag);\n questionManager.addEventHandlersToDrag(cloneDrag);\n drag.offset(cloneDrag.offset());\n } else {\n hiddenDrag.addClass('active');\n drag.offset(hiddenDrag.offset());\n }\n } else {\n hiddenDrag.addClass('active');\n drag.offset(hiddenDrag.offset());\n }\n }\n }\n\n dragDrop.start(e, drag, function(x, y, drag) {\n thisQ.dragMove(x, y, drag);\n }, function(x, y, drag) {\n thisQ.dragEnd(x, y, drag);\n });\n };\n\n /**\n * Called whenever the currently dragged items moves.\n *\n * @param {Number} pageX the x position.\n * @param {Number} pageY the y position.\n * @param {jQuery} drag the item being moved.\n */\n DragDropToTextQuestion.prototype.dragMove = function(pageX, pageY, drag) {\n var thisQ = this;\n this.getRoot().find('span.group' + this.getGroup(drag)).not('.beingdragged').each(function(i, dropNode) {\n var drop = $(dropNode);\n if (thisQ.isPointInDrop(pageX, pageY, drop)) {\n drop.addClass('valid-drag-over-drop');\n } else {\n drop.removeClass('valid-drag-over-drop');\n }\n });\n };\n\n /**\n * Called when user drops a drag item.\n *\n * @param {Number} pageX the x position.\n * @param {Number} pageY the y position.\n * @param {jQuery} drag the item being moved.\n */\n DragDropToTextQuestion.prototype.dragEnd = function(pageX, pageY, drag) {\n var thisQ = this,\nroot = this.getRoot(),\n placed = false;\n root.find('span.group' + this.getGroup(drag)).not('.beingdragged').each(function(i, dropNode) {\n if (placed) {\n return false;\n }\n const dropZone = $(dropNode);\n if (!thisQ.isPointInDrop(pageX, pageY, dropZone)) {\n // Not this drop zone.\n return true;\n }\n let drop = null;\n if (dropZone.hasClass('placed')) {\n // This is an placed drag item in a drop.\n dropZone.removeClass('valid-drag-over-drop');\n // Get the correct drop.\n drop = thisQ.getDrop(drag, thisQ.getClassnameNumericSuffix(dropZone, 'inplace'));\n } else {\n // Empty drop.\n drop = dropZone;\n }\n // Now put this drag into the drop.\n drop.removeClass('valid-drag-over-drop');\n thisQ.sendDragToDrop(drag, drop);\n placed = true;\n return false; // Stop the each() here.\n });\n if (!placed) {\n this.sendDragHome(drag);\n }\n };\n\n /**\n * Animate a drag item into a given place (or back home).\n *\n * @param {jQuery|null} drag the item to place. If null, clear the place.\n * @param {jQuery} drop the place to put it.\n */\n DragDropToTextQuestion.prototype.sendDragToDrop = function(drag, drop) {\n // Send drag home if there is no place in drop.\n if (this.getPlace(drop) === null) {\n this.sendDragHome(drag);\n return;\n }\n\n // Is there already a drag in this drop? if so, evict it.\n var oldDrag = this.getCurrentDragInPlace(this.getPlace(drop));\n if (oldDrag.length !== 0) {\n var currentPlace = this.getClassnameNumericSuffix(oldDrag, 'inplace');\n // When infinite group and there is already a drag in a drop, reject the exact clone in the same drop.\n if (this.hasDropSameDrag(currentPlace, drop, oldDrag, drag)) {\n this.sendDragHome(drag);\n return;\n }\n var hiddenDrop = this.getDrop(oldDrag, currentPlace);\n hiddenDrop.addClass('active');\n oldDrag.addClass('beingdragged');\n oldDrag.offset(hiddenDrop.offset());\n this.sendDragHome(oldDrag);\n }\n\n if (drag.length === 0) {\n this.setInputValue(this.getPlace(drop), 0);\n if (drop.data('isfocus')) {\n drop.focus();\n }\n } else {\n // Prevent the drag item drop into two drop-zone.\n if (this.getClassnameNumericSuffix(drag, 'inplace')) {\n return;\n }\n\n this.setInputValue(this.getPlace(drop), this.getChoice(drag));\n drag.removeClass('unplaced')\n .addClass('placed inplace' + this.getPlace(drop));\n drag.attr('tabindex', 0);\nthis.animateTo(drag, drop);\n }\n };\n\n /**\n * When infinite group and there is already a drag in a drop, reject the exact clone in the same drop.\n *\n * @param {int} currentPlace the position of the current drop.\n * @param {jQuery} drop the drop containing a drag.\n * @param {jQuery} oldDrag the drag already placed in drop.\n * @param {jQuery} drag the new drag which is exactly the same (clone) as oldDrag .\n * @returns {boolean}\n */\n DragDropToTextQuestion.prototype.hasDropSameDrag = function(currentPlace, drop, oldDrag, drag) {\n if (drag.hasClass('infinite')) {\n return drop.hasClass('place' + currentPlace) &&\n this.getGroup(drag) === this.getGroup(drop) &&\n this.getChoice(drag) === this.getChoice(oldDrag) &&\n this.getGroup(drag) === this.getGroup(oldDrag);\n }\n return false;\n };\n\n /**\n * Animate a drag back to its home.\n *\n * @param {jQuery} drag the item being moved.\n */\n DragDropToTextQuestion.prototype.sendDragHome = function(drag) {\n var currentPlace = this.getClassnameNumericSuffix(drag, 'inplace');\n if (currentPlace !== null) {\n drag.removeClass('inplace' + currentPlace);\n }\n drag.data('unplaced', true);\n\n this.animateTo(drag, this.getDragHome(this.getGroup(drag), this.getChoice(drag)));\n };\n\n /**\n * Handles keyboard events on drops.\n *\n * Drops are focusable. Once focused, right/down/space switches to the next choice, and\n * left/up switches to the previous. Escape clear.\n *\n * @param {KeyboardEvent} e\n */\n DragDropToTextQuestion.prototype.handleKeyPress = function(e) {\n var drop = $(e.target).closest('.drop');\n if (drop.length === 0) {\n var placedDrag = $(e.target);\n var currentPlace = this.getClassnameNumericSuffix(placedDrag, 'inplace');\n if (currentPlace !== null) {\ndrop = this.getDrop(placedDrag, currentPlace);\n }\n }\n var currentDrag = this.getCurrentDragInPlace(this.getPlace(drop)),\n nextDrag = $();\n\n switch (e.keyCode) {\n case keys.space:\n case keys.arrowRight:\n case keys.arrowDown:\n nextDrag = this.getNextDrag(this.getGroup(drop), currentDrag);\n break;\n\n case keys.arrowLeft:\n case keys.arrowUp:\n nextDrag = this.getPreviousDrag(this.getGroup(drop), currentDrag);\n break;\n\n case keys.escape:\n break;\n\n default:\n questionManager.isKeyboardNavigation = false;\n return; // To avoid the preventDefault below.\n }\n\n if (nextDrag.length) {\n nextDrag.data('isfocus', true);\n nextDrag.addClass('beingdragged');\n var hiddenDrag = this.getDragClone(nextDrag);\n if (hiddenDrag.length) {\n if (nextDrag.hasClass('infinite')) {\n var noOfDrags = this.noOfDropsInGroup(this.getGroup(nextDrag));\n var cloneDrags = this.getInfiniteDragClones(nextDrag, false);\n if (cloneDrags.length < noOfDrags) {\n var cloneDrag = nextDrag.clone();\n cloneDrag.removeClass('beingdragged');\n cloneDrag.removeAttr('tabindex');\n hiddenDrag.after(cloneDrag);\n questionManager.addEventHandlersToDrag(cloneDrag);\n nextDrag.offset(cloneDrag.offset());\n } else {\n hiddenDrag.addClass('active');\n nextDrag.offset(hiddenDrag.offset());\n }\n } else {\n hiddenDrag.addClass('active');\n nextDrag.offset(hiddenDrag.offset());\n }\n }\n} else {\n drop.data('isfocus', true);\n }\n\n e.preventDefault();\n this.sendDragToDrop(nextDrag, drop);\n };\n\n /**\n * Choose the next drag in a group.\n *\n * @param {int} group which group.\n * @param {jQuery} drag current choice (empty jQuery if there isn't one).\n * @return {jQuery} the next drag in that group, or null if there wasn't one.\n */\n DragDropToTextQuestion.prototype.getNextDrag = function(group, drag) {\n var choice,\n numChoices = this.noOfChoicesInGroup(group);\n\n if (drag.length === 0) {\n choice = 1; // Was empty, so we want to select the first choice.\n } else {\n choice = this.getChoice(drag) + 1;\n }\n\n var next = this.getUnplacedChoice(group, choice);\n while (next.length === 0 && choice < numChoices) {\n choice++;\n next = this.getUnplacedChoice(group, choice);\n }\n\n return next;\n };\n\n /**\n * Choose the previous drag in a group.\n *\n * @param {int} group which group.\n * @param {jQuery} drag current choice (empty jQuery if there isn't one).\n * @return {jQuery} the next drag in that group, or null if there wasn't one.\n */\n DragDropToTextQuestion.prototype.getPreviousDrag = function(group, drag) {\n var choice;\n\n if (drag.length === 0) {\n choice = this.noOfChoicesInGroup(group);\n } else {\n choice = this.getChoice(drag) - 1;\n }\n\n var previous = this.getUnplacedChoice(group, choice);\n while (previous.length === 0 && choice > 1) {\n choice--;\n previous = this.getUnplacedChoice(group, choice);\n }\n\n // Does this choice exist?\n return previous;\n };\n\n /**\n * Animate an object to the given destination.\n *\n * @param {jQuery} drag the element to be animated.\n * @param {jQuery} target element marking the place to move it to.\n*/\n DragDropToTextQuestion.prototype.animateTo = function(drag, target) {\n var currentPos = drag.offset(),\n targetPos = target.offset(),\n thisQ = this;\n\n M.util.js_pending('qtype_ddwtos-animate-' + thisQ.containerId);\n // Animate works in terms of CSS position, whereas locating an object\n // on the page works best with jQuery offset() function. So, to get\n // the right target position, we work out the required change in\n // offset() and then add that to the current CSS position.\n drag.animate(\n {\n left: parseInt(drag.css('left')) + targetPos.left - currentPos.left,\n top: parseInt(drag.css('top')) + targetPos.top - currentPos.top\n },\n {\n duration: 'fast',\n done: function() {\n $('body').trigger('qtype_ddwtos-dragmoved', [drag, target, thisQ]);\n M.util.js_complete('qtype_ddwtos-animate-' + thisQ.containerId);\n }\n }\n );\n };\n\n /**\n * Detect if a point is inside a given DOM node.\n *\n * @param {Number} pageX the x position.\n * @param {Number} pageY the y position.\n * @param {jQuery} drop the node to check (typically a drop).\n * @return {boolean} whether the point is inside the node.\n */\n DragDropToTextQuestion.prototype.isPointInDrop = function(pageX, pageY, drop) {\n var position = drop.offset();\n return pageX >= position.left && pageX < position.left + drop.width()\n && pageY >= position.top && pageY < position.top + drop.height();\n };\n\n /**\n * Set the value of the hidden input for a place, to record what is currently there.\n *\n * @param {int} place which place to set the input value for.\n * @param {int} choice the value to set.\n */\n DragDropToTextQuestion.prototype.setInputValue = function(place, choice) {\n this.getRoot().find('input.placeinput.place' + place).val(choice);\n };\n\n /**\n * Get the outer div for this question.\n *\n * @returns {jQuery} containing that div.\n */\n DragDropToTextQuestion.prototype.getRoot = function() {\n return $(document.getElementById(this.containerId));\n };\n\n /**\n * Get drag home for a given choice.\n *\n * @param {int} group the group.\n * @param {int} choice the choice number.\n * @returns {jQuery} containing that div.\n */\n DragDropToTextQuestion.prototype.getDragHome = function(group, choice) {\n if (!this.getRoot().find('.draghome.dragplaceholder.group' + group + '.choice' + choice).is(':visible')) {\n return this.getRoot().find('.draggrouphomes' + group +\n ' span.draghome.infinite' +\n '.choice' + choice +\n '.group' + group);\n }\n return this.getRoot().find('.draghome.dragplaceholder.group' + group + '.choice' + choice);\n };\n\n /**\n * Get an unplaced choice for a particular group.\n *\n * @param {int} group the group.\n * @param {int} choice the choice number.\n * @returns {jQuery} jQuery wrapping the unplaced choice. If there isn't one, the jQuery will be empty.\n */\n DragDropToTextQuestion.prototype.getUnplacedChoice = function(group, choice) {\n return this.getRoot().find('.draghome.group' + group + '.choice' + choice + '.unplaced').slice(0, 1);\n };\n\n /**\n * Get the drag that is currently in a given place.\n *\n * @param {int} place the place number.\n * @return {jQuery} the current drag (or an empty jQuery if none).\n */\n DragDropToTextQuestion.prototype.getCurrentDragInPlace = function(place) {\n return this.getRoot().find('span.draghome.inplace' + place);\n };\n\n /**\n * Return the number of blanks in a given group.\n *\n * @param {int} group the group number.\n * @returns {int} the number of drops.\n */\n DragDropToTextQuestion.prototype.noOfDropsInGroup = function(group) {\n return this.getRoot().find('.drop.group' + group).length;\n };\n\n /**\n * Return the number of choices in a given group.\n *\n * @param {int} group the group number.\n * @returns {int} the number of choices.\n */\n DragDropToTextQuestion.prototype.noOfChoicesInGroup = function(group) {\n return this.getRoot().find('.draghome.group' + group).length;\n };\n\n /**\n * Return the number at the end of the CSS class name with the given prefix.\n *\n * @param {jQuery} node\n * @param {String} prefix name prefix\n * @returns {Number|null} the suffix if found, else null.\n */\n DragDropToTextQuestion.prototype.getClassnameNumericSuffix = function(node, prefix) {\n var classes = node.attr('class');\n if (classes !== undefined && classes !== '') {\n var classesArr = classes.split(' ');\n for (var index = 0; index < classesArr.length; index++) {\n var patt1 = new RegExp('^' + prefix + '([0-9])+$');\n if (patt1.test(classesArr[index])) {\n var patt2 = new RegExp('([0-9])+$');\n var match = patt2.exec(classesArr[index]);\n return Number(match[0]);\n }\n }\n }\n return null;\n };\n\n /**\n * Get the choice number of a drag.\n *\n * @param {jQuery} drag the drag.\n * @returns {Number} the choice number.\n */\n DragDropToTextQuestion.prototype.getChoice = function(drag) {\n return this.getClassnameNumericSuffix(drag, 'choice');\n };\n\n /**\n * Given a DOM node that is significant to this question\n * (drag, drop, ...) get the group it belongs to.\n *\n * @param {jQuery} node a DOM node.\n * @returns {Number} the group it belongs to.\n */\n DragDropToTextQuestion.prototype.getGroup = function(node) {\n return this.getClassnameNumericSuffix(node, 'group');\n };\n\n /**\n * Get the place number of a drop, or its corresponding hidden input.\n *\n * @param {jQuery} node the DOM node.\n * @returns {Number} the place number.\n */\n DragDropToTextQuestion.prototype.getPlace = function(node) {\n return this.getClassnameNumericSuffix(node, 'place');\n };\n\n /**\n * Get drag clone for a given drag.\n *\n * @param {jQuery} drag the drag.\n * @returns {jQuery} the drag's clone.\n */\n DragDropToTextQuestion.prototype.getDragClone = function(drag) {\n return this.getRoot().find('.draggrouphomes' +\n this.getGroup(drag) +\n ' span.draghome' +\n '.choice' + this.getChoice(drag) +\n '.group' + this.getGroup(drag) +\n '.dragplaceholder');\n };\n\n /**\n * Get infinite drag clones for given drag.\n *\n * @param {jQuery} drag the drag.\n * @param {Boolean} inHome in the home area or not.\n * @returns {jQuery} the drag's clones.\n */\n DragDropToTextQuestion.prototype.getInfiniteDragClones = function(drag, inHome) {\n if (inHome) {\n return this.getRoot().find('.draggrouphomes' +\n this.getGroup(drag) +\n ' span.draghome' +\n '.choice' + this.getChoice(drag) +\n '.group' + this.getGroup(drag) +\n '.infinite').not('.dragplaceholder');\n }\n return this.getRoot().find('span.draghome' +\n '.choice' + this.getChoice(drag) +\n '.group' + this.getGroup(drag) +\n '.infinite').not('.dragplaceholder');\n };\n\n /**\n * Get drop for a given drag and place.\n *\n * @param {jQuery} drag the drag.\n * @param {Integer} currentPlace the current place of drag.\n * @returns {jQuery} the drop's clone.\n */\n DragDropToTextQuestion.prototype.getDrop = function(drag, currentPlace) {\n return this.getRoot().find('.drop.group' + this.getGroup(drag) + '.place' + currentPlace);\n };\n\n /**\n * Singleton that tracks all the DragDropToTextQuestions on this page, and deals\n * with event dispatching.\n *\n * @type {Object}\n */\n var questionManager = {\n /**\n * {boolean} used to ensure the event handlers are only initialised once per page.\n */\n eventHandlersInitialised: false,\n\n /**\n * {Object} ensures that the drag event handlers are only initialised once per question,\n * indexed by containerId (id on the .que div).\n */\n dragEventHandlersInitialised: {},\n\n /**\n * {boolean} is keyboard navigation or not.\n */\n isKeyboardNavigation: false,\n\n /**\n * {DragDropToTextQuestion[]} all the questions on this page, indexed by containerId (id on the .que div).\n */\n questions: {},\n\n /**\n * Initialise questions.\n *\n * @param {String} containerId id of the outer div for this question.\n * @param {boolean} readOnly whether the question is being displayed read-only.\n */\n init: function(containerId, readOnly) {\n questionManager.questions[containerId] = new DragDropToTextQuestion(containerId, readOnly);\n if (!questionManager.eventHandlersInitialised) {\n questionManager.setupEventHandlers();\n questionManager.eventHandlersInitialised = true;\n }\n if (!questionManager.dragEventHandlersInitialised.hasOwnProperty(containerId)) {\n questionManager.dragEventHandlersInitialised[containerId] = true;\n // We do not use the body event here to prevent the other event on Mobile device, such as scroll event.\n var questionContainer = document.getElementById(containerId);\n if (questionContainer.classList.contains('ddwtos') &&\n !questionContainer.classList.contains('qtype_ddwtos-readonly')) {\n // TODO: Convert all the jQuery selectors and events to native Javascript.\n questionManager.addEventHandlersToDrag($(questionContainer).find('span.draghome'));\n }\n }\n },\n\n /**\n * Set up the event handlers that make this question type work. 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