1 // This file is part of Moodle - http://moodle.org/
3 // Moodle is free software: you can redistribute it and/or modify
4 // it under the terms of the GNU General Public License as published by
5 // the Free Software Foundation, either version 3 of the License, or
6 // (at your option) any later version.
8 // Moodle is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 // GNU General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
17 * Javascript library for enableing a drag and drop upload interface
21 * @copyright 2011 Davo Smith
22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
27 M.form_dndupload.init = function(Y, options) {
28 var dnduploadhelper = {
31 // URL for upload requests
32 url: M.cfg.wwwroot + '/repository/repository_ajax.php?action=upload',
33 // options may include: itemid, acceptedtypes, maxfiles, maxbytes, clientid, repositoryid, author, contextid
35 // itemid used for repository upload
37 // accepted filetypes accepted by this form passed to repository
39 // maximum size of files allowed in this form
41 // Maximum combined size of files allowed in this form. {@link FILE_AREA_MAX_BYTES_UNLIMITED}
43 // unqiue id of this form field used for html elements
45 // upload repository id, used for upload
47 // container which holds the node which recieves drag events
49 // filemanager element we are working with
51 // callback to filepicker element to refesh when uploaded
53 // Nasty hack to distinguish between dragenter(first entry),
54 // dragenter+dragleave(moving between child elements) and dragleave (leaving element)
57 // Holds the progress bar elements for each file.
61 * Initalise the drag and drop upload interface
62 * Note: one and only one of options.filemanager and options.formcallback must be defined
64 * @param Y the YUI object
65 * @param object options {
66 * itemid: itemid used for repository upload in this form
67 * acceptdtypes: accepted filetypes by this form
68 * maxfiles: maximum number of files this form allows
69 * maxbytes: maximum size of files allowed in this form
70 * areamaxbytes: maximum combined size of files allowed in this form
71 * clientid: unqiue id of this form field used for html elements
72 * contextid: id of the current cotnext
73 * containerid: htmlid of container
74 * repositories: array of repository objects passed from filepicker
75 * filemanager: filemanager element we are working with
76 * formcallback: callback to filepicker element to refesh when uploaded
79 init: function(Y, options) {
82 if (!this.browser_supported()) {
83 Y.one('body').addClass('dndnotsupported');
84 return; // Browser does not support the required functionality
87 // try and retrieve enabled upload repository
88 this.repositoryid = this.get_upload_repositoryid(options.repositories);
90 if (!this.repositoryid) {
91 Y.one('body').addClass('dndnotsupported');
92 return; // no upload repository is enabled to upload to
95 Y.one('body').addClass('dndsupported');
97 this.options = options;
98 this.acceptedtypes = options.acceptedtypes;
99 this.clientid = options.clientid;
100 this.maxbytes = options.maxbytes;
101 this.areamaxbytes = options.areamaxbytes;
102 this.itemid = options.itemid;
103 this.author = options.author;
104 this.container = this.Y.one('#'+options.containerid);
106 if (options.filemanager) {
107 // Needed to tell the filemanager to redraw when files uploaded
108 // and to check how many files are already uploaded
109 this.filemanager = options.filemanager;
110 } else if (options.formcallback) {
112 // Needed to tell the filepicker to update when a new
114 this.callback = options.formcallback;
116 if (M.cfg.developerdebug) {
117 alert('dndupload: Need to define either options.filemanager or options.formcallback');
123 this.init_page_events();
127 * Check the browser has the required functionality
128 * @return true if browser supports drag/drop upload
130 browser_supported: function() {
132 if (typeof FileReader == 'undefined') {
135 if (typeof FormData == 'undefined') {
142 * Get upload repoistory from array of enabled repositories
144 * @param array repositories repository objects passed from filepicker
145 * @param returns int id of upload repository or false if not found
147 get_upload_repositoryid: function(repositories) {
148 for (var i in repositories) {
149 if (repositories[i].type == "upload") {
150 return repositories[i].id;
158 * Initialise drag events on node container, all events need
159 * to be processed for drag and drop to work
161 init_events: function() {
162 this.Y.on('dragenter', this.drag_enter, this.container, this);
163 this.Y.on('dragleave', this.drag_leave, this.container, this);
164 this.Y.on('dragover', this.drag_over, this.container, this);
165 this.Y.on('drop', this.drop, this.container, this);
169 * Initialise whole-page events (to show / hide the 'drop files here'
172 init_page_events: function() {
173 this.Y.on('dragenter', this.drag_enter_page, 'body', this);
174 this.Y.on('dragleave', this.drag_leave_page, 'body', this);
178 * Check if the filemanager / filepicker is disabled
179 * @return bool - true if disabled
181 is_disabled: function() {
182 return (this.container.ancestor('.fitem.disabled') != null);
186 * Show the 'drop files here' message when file(s) are dragged
189 drag_enter_page: function(e) {
190 if (this.is_disabled()) {
193 if (!this.has_files(e)) {
197 this.pageentercount++;
198 if (this.pageentercount >= 2) {
199 this.pageentercount = 2;
203 this.show_drop_target();
209 * Hide the 'drop files here' message when file(s) are dragged off
212 drag_leave_page: function(e) {
213 this.pageentercount--;
214 if (this.pageentercount == 1) {
217 this.pageentercount = 0;
219 this.hide_drop_target();
225 * Check if the drag contents are valid and then call
226 * preventdefault / stoppropagation to let the browser know
227 * we will handle this drag/drop
229 * @param e event object
230 * @return boolean true if a valid file drag event
232 check_drag: function(e) {
233 if (this.is_disabled()) {
236 if (!this.has_files(e)) {
247 * Handle a dragenter event, highlight the destination node
248 * when a suitable drag event occurs
250 drag_enter: function(e) {
251 if (!this.check_drag(e)) {
256 if (this.entercount >= 2) {
257 this.entercount = 2; // Just moved over a child element - nothing to do
261 // These lines are needed if the user has dragged something directly
262 // from application onto the 'fileupload' box, without crossing another
263 // part of the page first
264 this.pageentercount = 2;
265 this.show_drop_target();
267 this.show_upload_ready();
272 * Handle a dragleave event, Remove the highlight if dragged from
275 drag_leave: function(e) {
276 if (!this.check_drag(e)) {
281 if (this.entercount == 1) {
282 return false; // Just moved over a child element - nothing to do
286 this.hide_upload_ready();
291 * Handle a dragover event. Required to intercept to prevent the browser from
292 * handling the drag and drop event as normal
294 drag_over: function(e) {
295 if (!this.check_drag(e)) {
303 * Handle a drop event. Remove the highlight and then upload each
304 * of the files (until we reach the file limit, or run out of files)
307 if (!this.check_drag(e, true)) {
312 this.pageentercount = 0;
313 this.hide_upload_ready();
314 this.hide_drop_target();
316 var files = e._event.dataTransfer.files;
317 if (this.filemanager) {
320 options: this.options,
321 repositoryid: this.repositoryid,
322 currentfilecount: this.filemanager.filecount, // All files uploaded.
323 currentfiles: this.filemanager.options.list, // Only the current folder.
324 callback: Y.bind('update_filemanager', this),
325 callbackprogress: Y.bind('update_progress', this),
326 callbackcancel:Y.bind('hide_progress', this)
328 this.clear_progress();
329 this.show_progress();
330 var uploader = new dnduploader(options);
331 uploader.start_upload();
333 if (files.length >= 1) {
336 options: this.options,
337 repositoryid: this.repositoryid,
340 callback: Y.bind('update_filemanager', this),
341 callbackprogress: Y.bind('update_progress', this),
342 callbackcancel:Y.bind('hide_progress', this)
344 this.clear_progress();
345 this.show_progress();
346 uploader = new dnduploader(options);
347 uploader.start_upload();
355 * Check to see if the drag event has any files in it
357 * @param e event object
358 * @return boolean true if event has files
360 has_files: function(e) {
361 // In some browsers, dataTransfer.types may be null for a
362 // 'dragover' event, so ensure a valid Array is always
364 var types = e._event.dataTransfer.types || [];
365 for (var i=0; i<types.length; i++) {
366 if (types[i] == 'Files') {
374 * Highlight the area where files could be dropped
376 show_drop_target: function() {
377 this.container.addClass('dndupload-ready');
380 hide_drop_target: function() {
381 this.container.removeClass('dndupload-ready');
385 * Highlight the destination node (ready to drop)
387 show_upload_ready: function() {
388 this.container.addClass('dndupload-over');
392 * Remove highlight on destination node
394 hide_upload_ready: function() {
395 this.container.removeClass('dndupload-over');
399 * Show the element showing the upload in progress
401 show_progress: function() {
402 this.container.addClass('dndupload-inprogress');
406 * Hide the element showing upload in progress
408 hide_progress: function() {
409 this.container.removeClass('dndupload-inprogress');
413 * Tell the attached filemanager element (if any) to refresh on file
416 update_filemanager: function(params) {
417 this.hide_progress();
418 if (this.filemanager) {
419 // update the filemanager that we've uploaded the files
420 this.filemanager.filepicker_callback();
421 } else if (this.callback) {
422 this.callback(params);
427 * Clear the current progress bars
429 clear_progress: function() {
431 for (filename in this.progressbars) {
432 if (this.progressbars.hasOwnProperty(filename)) {
433 this.progressbars[filename].progressouter.remove(true);
434 delete this.progressbars[filename];
440 * Show the current progress of the uploaded file
442 update_progress: function(filename, percent) {
443 if (this.progressbars[filename] === undefined) {
444 var dispfilename = filename;
445 if (dispfilename.length > 50) {
446 dispfilename = dispfilename.substr(0, 49)+'…';
448 var progressouter = this.container.create('<span>'+dispfilename+': <span class="dndupload-progress-outer"><span class="dndupload-progress-inner"> </span></span><br /></span>');
449 var progressinner = progressouter.one('.dndupload-progress-inner');
450 var progresscontainer = this.container.one('.dndupload-progressbars');
451 progresscontainer.appendChild(progressouter);
453 this.progressbars[filename] = {
454 progressouter: progressouter,
455 progressinner: progressinner
459 this.progressbars[filename].progressinner.setStyle('width', percent + '%');
463 var dnduploader = function(options) {
464 dnduploader.superclass.constructor.apply(this, arguments);
467 Y.extend(dnduploader, Y.Base, {
468 // The URL to send the upload data to.
469 api: M.cfg.wwwroot+'/repository/repository_ajax.php',
470 // Options passed into the filemanager/filepicker element.
472 // The function to call when all uploads complete.
474 // The function to call as the upload progresses
475 callbackprogress: null,
476 // The function to call if the upload is cancelled
477 callbackcancel: null,
478 // The list of files dropped onto the element.
480 // The ID of the 'upload' repository.
482 // Array of files already in the current folder (to check for name clashes).
484 // Total number of files already uploaded (to check for exceeding limits).
486 // Total size of the files present in the area.
488 // The list of files to upload.
490 // This list of files with name clashes.
492 // Size of the current queue.
494 // Set to true if the user has clicked on 'overwrite all'.
496 // Set to true if the user has clicked on 'rename all'.
498 // Original onbeforeunload event.
499 originalUnloadEvent: null,
502 * Initialise the settings for the dnduploader
503 * @param object params - includes:
504 * options (copied from the filepicker / filemanager)
505 * repositoryid - ID of the upload repository
506 * callback - the function to call when uploads are complete
507 * currentfiles - the list of files already in the current folder in the filemanager
508 * currentfilecount - the total files already in the filemanager
509 * files - the list of files to upload
512 initializer: function(params) {
513 this.options = params.options;
514 this.repositoryid = params.repositoryid;
515 this.callback = params.callback;
516 this.callbackprogress = params.callbackprogress;
517 this.callbackcancel = params.callbackcancel;
518 this.currentfiles = params.currentfiles;
519 this.currentfilecount = params.currentfilecount;
520 this.currentareasize = 0;
522 // Retrieve the current size of the area.
523 for (var i = 0; i < this.currentfiles.length; i++) {
524 this.currentareasize += this.currentfiles[i].size;
527 if (!this.initialise_queue(params.files)) {
528 if (this.callbackcancel) {
529 this.callbackcancel();
532 this.originalUnloadEvent = window.onbeforeunload;
533 this.reportUploadDirtyState(true);
537 * Entry point for starting the upload process (starts by processing any
540 start_upload: function() {
541 this.process_renames(); // Automatically calls 'do_upload' once renames complete.
545 * Display a message in a popup
546 * @param string msg - the message to display
547 * @param string type - 'error' or 'info'
549 print_msg: function(msg, type) {
550 var header = M.util.get_string('error', 'moodle');
551 if (type != 'error') {
552 type = 'info'; // one of only two types excepted
553 header = M.util.get_string('info', 'moodle');
556 this.msg_dlg_node = Y.Node.create(M.core_filepicker.templates.message);
557 this.msg_dlg_node.generateID();
559 this.msg_dlg = new M.core.dialogue({
560 bodyContent: this.msg_dlg_node,
565 this.msg_dlg.plug(Y.Plugin.Drag,{handles:['#'+this.msg_dlg_node.get('id')+' .yui3-widget-hd']});
566 this.msg_dlg_node.one('.fp-msg-butok').on('click', function(e) {
572 this.msg_dlg.set('headerContent', header);
573 this.msg_dlg_node.removeClass('fp-msg-info').removeClass('fp-msg-error').addClass('fp-msg-'+type)
574 this.msg_dlg_node.one('.fp-msg-text').setContent(msg);
579 * Check the size of each file and add to either the uploadqueue or, if there
580 * is a name clash, the renamequeue
581 * @param FileList files - the files to upload
584 initialise_queue: function(files) {
585 this.uploadqueue = [];
586 this.renamequeue = [];
589 // Loop through the files and find any name clashes with existing files.
591 for (i=0; i<files.length; i++) {
592 if (this.options.maxbytes > 0 && files[i].size > this.options.maxbytes) {
593 // Check filesize before attempting to upload.
594 var maxbytesdisplay = this.display_size(this.options.maxbytes);
595 this.print_msg(M.util.get_string('maxbytesfile', 'error', {
597 size: maxbytesdisplay
599 this.uploadqueue = []; // No uploads if one file is too big.
603 if (this.has_name_clash(files[i].name)) {
604 this.renamequeue.push(files[i]);
606 if (!this.add_to_upload_queue(files[i], files[i].name, false)) {
610 this.queuesize += files[i].size;
616 * Generate the display for file size
617 * @param int size The size to convert to human readable form
620 display_size: function(size) {
621 // This is snippet of code (with some changes) is from the display_size function in moodlelib.
622 var gb = M.util.get_string('sizegb', 'moodle'),
623 mb = M.util.get_string('sizemb', 'moodle'),
624 kb = M.util.get_string('sizekb', 'moodle'),
625 b = M.util.get_string('sizeb', 'moodle');
627 if (size >= 1073741824) {
628 size = Math.round(size / 1073741824 * 10) / 10 + gb;
629 } else if (size >= 1048576) {
630 size = Math.round(size / 1048576 * 10) / 10 + mb;
631 } else if (size >= 1024) {
632 size = Math.round(size / 1024 * 10) / 10 + kb;
634 size = parseInt(size, 10) + ' ' + b;
641 * Add a single file to the uploadqueue, whilst checking the maxfiles limit
642 * @param File file - the file to add
643 * @param string filename - the name to give the file on upload
644 * @param bool overwrite - true to overwrite the existing file
645 * @return bool true if added successfully
647 add_to_upload_queue: function(file, filename, overwrite) {
649 this.currentfilecount++;
651 // The value for "unlimited files" is -1, so 0 should mean 0.
652 if (this.options.maxfiles >= 0 && this.currentfilecount > this.options.maxfiles) {
653 // Too many files - abort entire upload.
654 this.uploadqueue = [];
655 this.renamequeue = [];
656 this.print_msg(M.util.get_string('maxfilesreached', 'moodle', this.options.maxfiles), 'error');
659 // The new file will cause the area to reach its limit, we cancel the upload of all files.
660 // -1 is the value defined by FILE_AREA_MAX_BYTES_UNLIMITED.
661 if (this.options.areamaxbytes > -1) {
662 var sizereached = this.currentareasize + this.queuesize + file.size;
663 if (sizereached > this.options.areamaxbytes) {
664 this.uploadqueue = [];
665 this.renamequeue = [];
666 this.print_msg(M.util.get_string('maxareabytesreached', 'moodle'), 'error');
670 this.uploadqueue.push({file:file, filename:filename, overwrite:overwrite});
675 * Take the next file from the renamequeue and ask the user what to do with
676 * it. Called recursively until the queue is empty, then calls do_upload.
679 process_renames: function() {
680 if (this.renamequeue.length == 0) {
681 // All rename processing complete - start the actual upload.
685 var multiplefiles = (this.renamequeue.length > 1);
687 // Get the next file from the rename queue.
688 var file = this.renamequeue.shift();
689 // Generate a non-conflicting name for it.
690 var newname = this.generate_unique_name(file.name);
692 // If the user has clicked on overwrite/rename ALL then process
693 // this file, as appropriate, then process the rest of the queue.
694 if (this.overwriteall) {
695 this.add_to_upload_queue(file, file.name, true);
696 this.process_renames();
699 if (this.renameall) {
700 this.add_to_upload_queue(file, newname, false);
701 this.process_renames();
705 // Ask the user what to do with this file.
708 var process_dlg_node;
710 process_dlg_node = Y.Node.create(M.core_filepicker.templates.processexistingfilemultiple);
712 process_dlg_node = Y.Node.create(M.core_filepicker.templates.processexistingfile);
714 var node = process_dlg_node;
716 var process_dlg = new M.core.dialogue({
718 headerContent: M.util.get_string('fileexistsdialogheader', 'repository'),
723 process_dlg.plug(Y.Plugin.Drag,{handles:['#'+node.get('id')+' .yui3-widget-hd']});
725 // Overwrite original.
726 node.one('.fp-dlg-butoverwrite').on('click', function(e) {
729 self.add_to_upload_queue(file, file.name, true);
730 self.process_renames();
733 // Rename uploaded file.
734 node.one('.fp-dlg-butrename').on('click', function(e) {
737 self.add_to_upload_queue(file, newname, false);
738 self.process_renames();
741 // Cancel all uploads.
742 node.one('.fp-dlg-butcancel').on('click', function(e) {
745 if (self.callbackcancel) {
746 self.callbackcancel();
750 // When we are at the file limit, only allow 'overwrite', not rename.
751 if (this.currentfilecount == this.options.maxfiles) {
752 node.one('.fp-dlg-butrename').setStyle('display', 'none');
754 node.one('.fp-dlg-butrenameall').setStyle('display', 'none');
758 // If there are more files still to go, offer the 'overwrite/rename all' options.
760 // Overwrite all original files.
761 node.one('.fp-dlg-butoverwriteall').on('click', function(e) {
764 this.overwriteall = true;
765 self.add_to_upload_queue(file, file.name, true);
766 self.process_renames();
769 // Rename all new files.
770 node.one('.fp-dlg-butrenameall').on('click', function(e) {
773 this.renameall = true;
774 self.add_to_upload_queue(file, newname, false);
775 self.process_renames();
778 node.one('.fp-dlg-text').setContent(M.util.get_string('fileexists', 'moodle', file.name));
779 process_dlg_node.one('.fp-dlg-butrename').setContent(M.util.get_string('renameto', 'repository', newname));
781 // Destroy the dialog once it has been hidden.
782 process_dlg.after('visibleChange', function(e) {
783 if (!process_dlg.get('visible')) {
784 process_dlg.destroy(true);
792 * Checks if there is already a file with the given name in the current folder
793 * or in the list of already uploading files
794 * @param string filename - the name to test
795 * @return bool true if the name already exists
797 has_name_clash: function(filename) {
798 // Check against the already uploaded files
800 for (i=0; i<this.currentfiles.length; i++) {
801 if (filename == this.currentfiles[i].filename) {
805 // Check against the uploading files that have already been processed
806 for (i=0; i<this.uploadqueue.length; i++) {
807 if (filename == this.uploadqueue[i].filename) {
815 * Gets a unique file name
817 * @param string filename
818 * @return string the unique filename generated
820 generate_unique_name: function(filename) {
821 // Loop through increating numbers until a unique name is found.
822 while (this.has_name_clash(filename)) {
823 filename = increment_filename(filename);
829 * Upload the next file from the uploadqueue - called recursively after each
830 * upload is complete, then handles the callback to the filemanager/filepicker
831 * @param lastresult - the last result from the server
833 do_upload: function(lastresult) {
834 if (this.uploadqueue.length > 0) {
835 var filedetails = this.uploadqueue.shift();
836 this.upload_file(filedetails.file, filedetails.filename, filedetails.overwrite);
838 this.uploadfinished(lastresult);
843 * Run the callback to the filemanager/filepicker
845 uploadfinished: function(lastresult) {
846 this.reportUploadDirtyState(false);
847 this.callback(lastresult);
851 * Upload a single file via an AJAX call to the 'upload' repository. Automatically
852 * calls do_upload as each upload completes.
853 * @param File file - the file to upload
854 * @param string filename - the name to give the file
855 * @param bool overwrite - true if the existing file should be overwritten
857 upload_file: function(file, filename, overwrite) {
859 // This would be an ideal place to use the Y.io function
860 // however, this does not support data encoded using the
861 // FormData object, which is needed to transfer data from
862 // the DataTransfer object into an XMLHTTPRequest
863 // This can be converted when the YUI issue has been integrated:
864 // http://yuilibrary.com/projects/yui3/ticket/2531274
865 var xhr = new XMLHttpRequest();
868 // Update the progress bar
869 xhr.upload.addEventListener('progress', function(e) {
870 if (e.lengthComputable && self.callbackprogress) {
871 var percentage = Math.round((e.loaded * 100) / e.total);
872 self.callbackprogress(filename, percentage);
876 xhr.onreadystatechange = function() { // Process the server response
877 if (xhr.readyState == 4) {
878 if (xhr.status == 200) {
879 var result = JSON.parse(xhr.responseText);
882 self.print_msg(result.error, 'error'); // TODO add filename?
883 self.uploadfinished();
885 // Only update the filepicker if there were no errors
886 if (result.event == 'fileexists') {
887 // Do not worry about this, as we only care about the last
888 // file uploaded, with the filepicker
889 result.file = result.newfile.filename;
890 result.url = result.newfile.url;
892 result.client_id = self.options.clientid;
893 if (self.callbackprogress) {
894 self.callbackprogress(filename, 100);
898 self.do_upload(result); // continue uploading
900 self.print_msg(M.util.get_string('serverconnection', 'error'), 'error');
901 self.uploadfinished();
906 // Prepare the data to send
907 var formdata = new FormData();
908 formdata.append('repo_upload_file', file); // The FormData class allows us to attach a file
909 formdata.append('sesskey', M.cfg.sesskey);
910 formdata.append('repo_id', this.repositoryid);
911 formdata.append('itemid', this.options.itemid);
912 if (this.options.author) {
913 formdata.append('author', this.options.author);
915 if (this.options.filemanager) { // Filepickers do not have folders
916 formdata.append('savepath', this.options.filemanager.currentpath);
918 formdata.append('title', filename);
920 formdata.append('overwrite', 1);
922 if (this.options.contextid) {
923 formdata.append('ctx_id', this.options.contextid);
926 // Accepted types can be either a string or an array, but an array is
927 // expected in the processing script, so make sure we are sending an array
928 if (this.options.acceptedtypes.constructor == Array) {
929 for (var i=0; i<this.options.acceptedtypes.length; i++) {
930 formdata.append('accepted_types[]', this.options.acceptedtypes[i]);
933 formdata.append('accepted_types[]', this.options.acceptedtypes);
936 // Send the file & required details.
937 var uploadUrl = this.api;
938 if (uploadUrl.indexOf('?') !== -1) {
939 uploadUrl += '&action=upload';
941 uploadUrl += '?action=upload';
943 xhr.open("POST", uploadUrl, true);
949 * Set the event to prevent user navigate away when upload progress still running.
951 * @param {bool} enable true if upload progress is running, false otherwise
953 reportUploadDirtyState: function(enable) {
955 window.onbeforeunload = this.originalUnloadEvent;
957 window.onbeforeunload = function(e) {
958 var warningMessage = M.util.get_string('changesmadereallygoaway', 'moodle');
960 e.returnValue = warningMessage;
962 return warningMessage;
968 dnduploadhelper.init(Y, options);