Script d'upload d'image obscure !

Bonsoir,
Je me décide à poster car j'ai un souci de compréhension d'un script trouvé sur github qui se nomme valums file-uploader.

J'ai réussi à le faire fonctionner, mais la plupart du fonctionnement m'échappe et j'aimerais me l'approprier. (voilà le lien officiel http://valums.com/ajax-upload/ et le fork un peu plus récent: https://github.com/bencolon/file-uploader )

Voilà le fichier principal, le fileuploader.js

Code:

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/**  * http://github.com/valums/file-uploader  *  * Multiple file upload component with progress-bar, drag-and-drop.  * © 2010 Andrew Valums ( andrew(at)valums.com )  *  * Licensed under GNU GPL 2 or later and GNU LGPL 2 or later, see license.txt.  */   // // Helper functions //   var qq = qq || {};   /**  * Adds all missing properties from second obj to first obj  */ qq.extend = function(first, second){ for (var prop in second){ first[prop] = second[prop]; } };   /**  * Searches for a given element in the array, returns -1 if it is not present.  * @param {Number} [from] The index at which to begin the search  */ qq.indexOf = function(arr, elt, from){ if (arr.indexOf) return arr.indexOf(elt, from);   from = from || 0; var len = arr.length;   if (from < 0) from += len;   for (; from < len; from++){ if (from in arr && arr[from] === elt){ return from; } } return -1; };   qq.getUniqueId = (function(){ var id = 0; return function(){ return id++; }; })();   // // Browsers and platforms detection   qq.ie = function(){ return navigator.userAgent.indexOf('MSIE') != -1; } qq.safari = function(){ return navigator.vendor != undefined && navigator.vendor.indexOf("Apple") != -1; } qq.chrome = function(){ return navigator.vendor != undefined && navigator.vendor.indexOf('Google') != -1; } qq.firefox = function(){ return (navigator.userAgent.indexOf('Mozilla') != -1 && navigator.vendor != undefined && navigator.vendor == ''); } qq.windows = function(){ return navigator.platform == "Win32"; }   // // Events   qq.attach = function(element, type, fn){ if (element.addEventListener){ element.addEventListener(type, fn, false); } else if (element.attachEvent){ element.attachEvent('on' + type, fn); } }; qq.detach = function(element, type, fn){ if (element.removeEventListener){ element.removeEventListener(type, fn, false); } else if (element.attachEvent){ element.detachEvent('on' + type, fn); } };   qq.preventDefault = function(e){ if (e.preventDefault){ e.preventDefault(); } else{ e.returnValue = false; } };   // // Node manipulations   /**  * Insert node a before node b.  */ qq.insertBefore = function(a, b){ b.parentNode.insertBefore(a, b); }; qq.remove = function(element){ element.parentNode.removeChild(element); };   qq.contains = function(parent, descendant){ // compareposition returns false in this case if (parent == descendant) return true;   if (parent.contains){ return parent.contains(descendant); } else { return !!(descendant.compareDocumentPosition(parent) & 8); } };   /**  * Creates and returns element from html string  * Uses innerHTML to create an element  */ qq.toElement = (function(){ var div = document.createElement('div'); return function(html){ div.innerHTML = html; var element = div.firstChild; div.removeChild(element); return element; }; })();   // // Node properties and attributes   /**  * Sets styles for an element.  * Fixes opacity in IE6-8.  */ qq.css = function(element, styles){ if (styles.opacity != null){ if (typeof element.style.opacity != 'string' && typeof(element.filters) != 'undefined'){ styles.filter = 'alpha(opacity=' + Math.round(100 * styles.opacity) + ')'; } } qq.extend(element.style, styles); }; qq.hasClass = function(element, name){ var re = new RegExp('(^| )' + name + '( |$)'); return re.test(element.className); }; qq.addClass = function(element, name){ if (!qq.hasClass(element, name)){ element.className += ' ' + name; } }; qq.removeClass = function(element, name){ var re = new RegExp('(^| )' + name + '( |$)'); element.className = element.className.replace(re, ' ').replace(/^\s+|\s+$/g, ""); }; qq.setText = function(element, text){ element.innerText = text; element.textContent = text; };   // // Selecting elements   qq.children = function(element){ var children = [], child = element.firstChild;   while (child){ if (child.nodeType == 1){ children.push(child); } child = child.nextSibling; }   return children; };   qq.getByClass = function(element, className){ if (element.querySelectorAll){ return element.querySelectorAll('.' + className); }   var result = []; var candidates = element.getElementsByTagName("*"); var len = candidates.length;   for (var i = 0; i < len; i++){ if (qq.hasClass(candidates[i], className)){ result.push(candidates[i]); } } return result; };   /**  * obj2url() takes a json-object as argument and generates  * a querystring. pretty much like jQuery.param()  *  * how to use:  *  * `qq.obj2url({a:'b',c:'d'},'http://any.url/upload?otherParam=value');`  *  * will result in:  *  * `http://any.url/upload?otherParam=value&a=b&c=d`  *  * @param Object JSON-Object  * @param String current querystring-part  * @return String encoded querystring  */ qq.obj2url = function(obj, temp, prefixDone){ var uristrings = [], prefix = '&', add = function(nextObj, i){ var nextTemp = temp ? (/\[\]$/.test(temp)) // prevent double-encoding ? temp : temp+'['+i+']' : i; if ((nextTemp != 'undefined') && (i != 'undefined')) { uristrings.push( (typeof nextObj === 'object') ? qq.obj2url(nextObj, nextTemp, true) : (Object.prototype.toString.call(nextObj) === '[object Function]') ? encodeURIComponent(nextTemp) + '=' + encodeURIComponent(nextObj()) : encodeURIComponent(nextTemp) + '=' + encodeURIComponent(nextObj) ); } };   if (!prefixDone && temp) { prefix = (/\?/.test(temp)) ? (/\?$/.test(temp)) ? '' : '&' : '?'; uristrings.push(temp); uristrings.push(qq.obj2url(obj)); } else if ((Object.prototype.toString.call(obj) === '[object Array]') && (typeof obj != 'undefined') ) { // we wont use a for-in-loop on an array (performance) for (var i = 0, len = obj.length; i < len; ++i){ add(obj[i], i); } } else if ((typeof obj != 'undefined') && (obj !== null) && (typeof obj === "object")){ // for anything else but a scalar, we will use for-in-loop for (var i in obj){ add(obj[i], i); } } else { uristrings.push(encodeURIComponent(temp) + '=' + encodeURIComponent(obj)); }   return uristrings.join(prefix) .replace(/^&/, '') .replace(/%20/g, '+'); };   // // // Uploader Classes // //   var qq = qq || {};   /**  * Creates upload button, validates upload, but doesn't create file list or dd.  */ qq.FileUploaderBasic = function(o){ this._options = { // set to true to see the server response debug: false, action: '/server/upload', params: {}, button: null, multiple: true, maxConnections: 3, // validation allowedExtensions: [], acceptFiles: null, sizeLimit: 0, minSizeLimit: 0, // events // return false to cancel submit onSubmit: function(id, fileName){}, onProgress: function(id, fileName, loaded, total){}, onComplete: function(id, fileName, responseJSON){}, onCancel: function(id, fileName){}, onUpload: function(id, fileName, xhr){}, // messages messages: { typeError: "{file} n'est pas accepte. Seul les extensions suivantes sont valides {extensions}.", sizeError: "{file} est trop lourd, veuillez redimentionner la photo, poids maximum : {sizeLimit}.", minSizeError: "{file} est trop léger, la photo doit faire au moins {minSizeLimit}.", emptyError: "{file} est vide, merci de selectionner des images .", onLeave: "Les images sont en cours de transfert, si vous quittez la page maintenant le transfert sera annule." }, showMessage: function(message){ alert(message); }, inputName: 'qqfile', extraDropzones : [] }; qq.extend(this._options, o);   // number of files being uploaded this._filesInProgress = 0; this._handler = this._createUploadHandler();   if (this._options.button){ this._button = this._createUploadButton(this._options.button); }   this._preventLeaveInProgress(); };   qq.FileUploaderBasic.prototype = { setParams: function(params){ this._options.params = params; }, getInProgress: function(){ return this._filesInProgress; }, _createUploadButton: function(element){ var self = this;   return new qq.UploadButton({ element: element, multiple: this._options.multiple && qq.UploadHandlerXhr.isSupported(), acceptFiles: this._options.acceptFiles, onChange: function(input){ self._onInputChange(input); } }); }, _createUploadHandler: function(){ var self = this, handlerClass;   if(qq.UploadHandlerXhr.isSupported()){ handlerClass = 'UploadHandlerXhr'; } else { handlerClass = 'UploadHandlerForm'; }   var handler = new qq[handlerClass]({ debug: this._options.debug, action: this._options.action, maxConnections: this._options.maxConnections, inputName: this._options.inputName, extraDropzones: this._options.extraDropzones, onProgress: function(id, fileName, loaded, total){ self._onProgress(id, fileName, loaded, total); self._options.onProgress(id, fileName, loaded, total); }, onComplete: function(id, fileName, result){ self._onComplete(id, fileName, result); self._options.onComplete(id, fileName, result); }, onCancel: function(id, fileName){ self._onCancel(id, fileName); self._options.onCancel(id, fileName); }, onUpload: function(id, fileName, xhr){ self._onUpload(id, fileName, xhr); self._options.onUpload(id, fileName, xhr); } });   return handler; }, _preventLeaveInProgress: function(){ var self = this;   qq.attach(window, 'beforeunload', function(e){ if (!self._filesInProgress){return;}   var e = e || window.event; // for ie, ff e.returnValue = self._options.messages.onLeave; // for webkit return self._options.messages.onLeave; }); }, _onSubmit: function(id, fileName){ this._filesInProgress++; }, _onProgress: function(id, fileName, loaded, total){ }, _onComplete: function(id, fileName, result){ this._filesInProgress--; if (result.error){ this._options.showMessage(result.error); } }, _onCancel: function(id, fileName){ this._filesInProgress--; }, _onUpload: function(id, fileName, xhr){ }, _onInputChange: function(input){ if (this._handler instanceof qq.UploadHandlerXhr){ this._uploadFileList(input.files); } else { if (this._validateFile(input)){ this._uploadFile(input); } } this._button.reset(); }, _uploadFileList: function(files){ for (var i=0; i<files.length; i++){ if ( !this._validateFile(files[i])){ return; } }   for (var i=0; i<files.length; i++){ this._uploadFile(files[i]); } }, _uploadFile: function(fileContainer){ var id = this._handler.add(fileContainer); var fileName = this._handler.getName(id);   if (this._options.onSubmit(id, fileName) !== false){ this._onSubmit(id, fileName); this._handler.upload(id, this._options.params); } }, _validateFile: function(file){ var name, size;   if (file.value){ // it is a file input // get input value and remove path to normalize name = file.value.replace(/.*(\/|\\)/, ""); } else { // fix missing properties in Safari name = file.fileName != null ? file.fileName : file.name; size = file.fileSize != null ? file.fileSize : file.size; }   if (! this._isAllowedExtension(name)){ this._error('typeError', name); return false;   } else if (size === 0){ this._error('emptyError', name); return false;   } else if (size && this._options.sizeLimit && size > this._options.sizeLimit){ this._error('sizeError', name); return false;   } else if (size && size < this._options.minSizeLimit){ this._error('minSizeError', name); return false; }   return true; }, _error: function(code, fileName){ var message = this._options.messages[codexxx]; //<--- j'ai rajouté les x pour les besoin de lecture du forum function r(name, replacement){ message = message.replace(name, replacement); }   r('{file}', this._formatFileName(fileName)); r('{extensions}', this._options.allowedExtensions.join(', ')); r('{sizeLimit}', this._formatSize(this._options.sizeLimit)); r('{minSizeLimit}', this._formatSize(this._options.minSizeLimit));   this._options.showMessage(message); }, _formatFileName: function(name){ if (name.length > 33){ name = name.slice(0, 19) + '...' + name.slice(-13); } return name; }, _isAllowedExtension: function(fileName){ var ext = (-1 !== fileName.indexOf('.')) ? fileName.replace(/.*[.]/, '').toLowerCase() : ''; var allowed = this._options.allowedExtensions;   if (!allowed.length){return true;}   for (var i=0; i<allowed.length; i++){ if (allowed[i].toLowerCase() == ext){ return true;} }   return false; }, _formatSize: function(bytes){ var i = -1; do { bytes = bytes / 1024; i++; } while (bytes > 99);   return Math.max(bytes, 0.1).toFixed(1) + ['kB', 'MB', 'GB', 'TB', 'PB', 'EB'][i]; } };     /**  * Class that creates upload widget with drag-and-drop and file list  * @inherits qq.FileUploaderBasic  */ qq.FileUploader = function(o){ // call parent constructor qq.FileUploaderBasic.apply(this, arguments);   // additional options qq.extend(this._options, { element: null, // if set, will be used instead of qq-upload-list in template listElement: null,   template: '<div class="qq-uploader">' + '<div class="qq-upload-drop-area"><span>Deplacer les photos ici</span></div>' + '<div class="qq-upload-button">Ajouter des photos</div>' + '<ul class="qq-upload-list"></ul>' + '</div>',   // template for one item in file list fileTemplate: '<li>' + '<span class="qq-upload-file"></span>' + '<span class="qq-upload-spinner"></span>' + '<span class="qq-upload-size"></span>' + '<a class="qq-upload-cancel" href="#">Annuler</a>' + '<span class="qq-upload-failed-text">Echec</span>' + '</li>',   classes: { // used to get elements from templates button: 'qq-upload-button', drop: 'qq-upload-drop-area', dropActive: 'qq-upload-drop-area-active', list: 'qq-upload-list',   file: 'qq-upload-file', spinner: 'qq-upload-spinner', size: 'qq-upload-size', cancel: 'qq-upload-cancel',   // added to list item when upload completes // used in css to hide progress spinner success: 'qq-upload-success', fail: 'qq-upload-fail' } }); // overwrite options with user supplied qq.extend(this._options, o);   this._element = this._options.element; this._element.innerHTML = this._options.template; this._listElement = this._options.listElement || this._find(this._element, 'list');   this._classes = this._options.classes;   this._button = this._createUploadButton(this._find(this._element, 'button'));   this._bindCancelEvent(); this._setupDragDrop(); };   // inherit from Basic Uploader qq.extend(qq.FileUploader.prototype, qq.FileUploaderBasic.prototype);   qq.extend(qq.FileUploader.prototype, { addExtraDropzone: function(element){ this._setupExtraDropzone(element); }, removeExtraDropzone: function(element){ var dzs = this._options.extraDropzones; for(var i in dzs) if (dzs[i] === element) return this._options.extraDropzones.splice(i,1); }, _leaving_document_out: function(e){ return ((qq.chrome() || (qq.safari() && qq.windows())) && e.clientX == 0 && e.clientY == 0) // null coords for Chrome and Safari Windows || (qq.firefox() && !e.relatedTarget); // null e.relatedTarget for Firefox }, /**   * Gets one of the elements listed in this._options.classes   **/ _find: function(parent, type){ var element = qq.getByClass(parent, this._options.classes[type])[0]; if (!element){ throw new Error('element not found ' + type); }   return element; }, _setupExtraDropzone: function(element){ this._options.extraDropzones.push(element); this._setupDropzone(element); }, _setupDropzone: function(dropArea){ var self = this;   var dz = new qq.UploadDropZone({ element: dropArea, onEnter: function(e){ qq.addClass(dropArea, self._classes.dropActive); e.stopPropagation(); }, onLeave: function(e){ //e.stopPropagation(); }, onLeaveNotDescendants: function(e){ qq.removeClass(dropArea, self._classes.dropActive); }, onDrop: function(e){ dropArea.style.display = 'none'; qq.removeClass(dropArea, self._classes.dropActive); self._uploadFileList(e.dataTransfer.files); } });   dropArea.style.display = 'none'; }, _setupDragDrop: function(){ var dropArea = this._find(this._element, 'drop'); this._options.extraDropzones.push(dropArea);   var dropzones = this._options.extraDropzones; for (var elem in dropzones){ this._setupDropzone(dropzones[elem]); }   qq.attach(document, 'dragenter', function(e){ if(!qq.ie()) { for (var elem in dropzones){ dropzones[elem].style.display = 'block'; } } }); qq.attach(document, 'dragleave', function(e){ var relatedTarget = document.elementFromPoint(e.clientX, e.clientY); // only fire when leaving document out if (qq.FileUploader.prototype._leaving_document_out(e)) { for (var elem in dropzones){ dropzones[elem].style.display = 'none'; } } }); qq.attach(document, 'drop', function(e){ for (var elem in dropzones){ dropzones[elem].style.display = 'none'; } e.preventDefault(); }); }, _onSubmit: function(id, fileName){ qq.FileUploaderBasic.prototype._onSubmit.apply(this, arguments); this._addToList(id, fileName); }, _onProgress: function(id, fileName, loaded, total){ qq.FileUploaderBasic.prototype._onProgress.apply(this, arguments);   var item = this._getItemByFileId(id); var size = this._find(item, 'size'); size.style.display = 'inline';   var text; if (loaded != total){ text = Math.round(loaded / total * 100) + '% from ' + this._formatSize(total); } else { text = this._formatSize(total); }   qq.setText(size, text); }, _onComplete: function(id, fileName, result){ qq.FileUploaderBasic.prototype._onComplete.apply(this, arguments);   // mark completed var item = this._getItemByFileId(id); qq.remove(this._find(item, 'cancel')); qq.remove(this._find(item, 'spinner'));   if (result.success){ qq.addClass(item, this._classes.success); } else { qq.addClass(item, this._classes.fail); } }, _addToList: function(id, fileName){ var item = qq.toElement(this._options.fileTemplate); item.qqFileId = id;   var fileElement = this._find(item, 'file'); qq.setText(fileElement, this._formatFileName(fileName)); this._find(item, 'size').style.display = 'none';   this._listElement.appendChild(item); }, _getItemByFileId: function(id){ var item = this._listElement.firstChild;   // there can't be txt nodes in dynamically created list // and we can use nextSibling while (item){ if (item.qqFileId == id) return item; item = item.nextSibling; } }, /**   * delegate click event for cancel link   **/ _bindCancelEvent: function(){ var self = this, list = this._listElement;   qq.attach(list, 'click', function(e){ e = e || window.event; var target = e.target || e.srcElement;   if (qq.hasClass(target, self._classes.cancel)){ qq.preventDefault(e);   var item = target.parentNode; self._handler.cancel(item.qqFileId); qq.remove(item); } }); } });   qq.UploadDropZone = function(o){ this._options = { element: null, onEnter: function(e){}, onLeave: function(e){}, // is not fired when leaving element by hovering descendants onLeaveNotDescendants: function(e){}, onDrop: function(e){} }; qq.extend(this._options, o);   this._element = this._options.element;   this._disableDropOutside(); this._attachEvents(); };   qq.UploadDropZone.prototype = { _dragover_should_be_canceled: function(){ return qq.safari() || (qq.firefox() && qq.windows()); }, _disableDropOutside: function(e){ // run only once for all instances if (!qq.UploadDropZone.dropOutsideDisabled ){   // for these cases we need to catch onDrop to reset dropArea if (this._dragover_should_be_canceled){ qq.attach(document, 'dragover', function(e){ e.preventDefault(); }); } else { qq.attach(document, 'dragover', function(e){ if (e.dataTransfer){ e.dataTransfer.dropEffect = 'none'; e.preventDefault(); } }); }   qq.UploadDropZone.dropOutsideDisabled = true; } }, _attachEvents: function(){ var self = this;   qq.attach(self._element, 'dragover', function(e){ if (!self._isValidFileDrag(e)) return;   var effect = qq.ie() ? null : e.dataTransfer.effectAllowed; if (effect == 'move' || effect == 'linkMove'){ e.dataTransfer.dropEffect = 'move'; // for FF (only move allowed) } else { e.dataTransfer.dropEffect = 'copy'; // for Chrome }   e.stopPropagation(); e.preventDefault(); });   qq.attach(self._element, 'dragenter', function(e){ if (!self._isValidFileDrag(e)) return;   self._options.onEnter(e); });   qq.attach(self._element, 'dragleave', function(e){ if (!self._isValidFileDrag(e)) return;   self._options.onLeave(e);   var relatedTarget = document.elementFromPoint(e.clientX, e.clientY); // do not fire when moving a mouse over a descendant if (qq.contains(this, relatedTarget)) return;   self._options.onLeaveNotDescendants(e); });   qq.attach(self._element, 'drop', function(e){ if (!self._isValidFileDrag(e)) return;   e.preventDefault(); self._options.onDrop(e); }); }, _isValidFileDrag: function(e){ var dt = e.dataTransfer, // do not check dt.types.contains in webkit, because it crashes safari 4 isSafari = qq.safari();   // dt.effectAllowed is none in Safari 5 // dt.types.contains check is for firefox return dt && dt.effectAllowed != 'none' && (dt.files || (!isSafari && dt.types.contains && dt.types.contains('Files')));   } };   qq.UploadButton = function(o){ this._options = { element: null, // if set to true adds multiple attribute to file input multiple: false, acceptFiles: null, // name attribute of file input name: 'file', onChange: function(input){}, hoverClass: 'qq-upload-button-hover', focusClass: 'qq-upload-button-focus' };   qq.extend(this._options, o);   this._element = this._options.element;   // make button suitable container for input qq.css(this._element, { position: 'relative', overflow: 'hidden', // Make sure browse button is in the right side // in Internet Explorer direction: 'ltr' });   this._input = this._createInput(); };   qq.UploadButton.prototype = { /* returns file input element */ getInput: function(){ return this._input; }, /* cleans/recreates the file input */ reset: function(){ if (this._input.parentNode){ qq.remove(this._input); }   qq.removeClass(this._element, this._options.focusClass); this._input = this._createInput(); }, _createInput: function(){ var input = document.createElement("input");   if (this._options.multiple){ input.setAttribute("multiple", "multiple"); }   if (this._options.acceptFiles) input.setAttribute("accept", this._options.acceptFiles);   input.setAttribute("type", "file"); input.setAttribute("name", this._options.name);   qq.css(input, { position: 'absolute', // in Opera only 'browse' button // is clickable and it is located at // the right side of the input right: 0, top: 0, fontFamily: 'Arial', // 4 persons reported this, the max values that worked for them were 243, 236, 236, 118 fontSize: '118px', margin: 0, padding: 0, cursor: 'pointer', opacity: 0 });   this._element.appendChild(input);   var self = this; qq.attach(input, 'change', function(){ self._options.onChange(input); });   qq.attach(input, 'mouseover', function(){ qq.addClass(self._element, self._options.hoverClass); }); qq.attach(input, 'mouseout', function(){ qq.removeClass(self._element, self._options.hoverClass); }); qq.attach(input, 'focus', function(){ qq.addClass(self._element, self._options.focusClass); }); qq.attach(input, 'blur', function(){ qq.removeClass(self._element, self._options.focusClass); });   // IE and Opera, unfortunately have 2 tab stops on file input // which is unacceptable in our case, disable keyboard access if (window.attachEvent){ // it is IE or Opera input.setAttribute('tabIndex', "-1"); }   return input; } };   /**  * Class for uploading files, uploading itself is handled by child classes  */ qq.UploadHandlerAbstract = function(o){ this._options = { debug: false, action: '/upload.php', // maximum number of concurrent uploads maxConnections: 3, onProgress: function(id, fileName, loaded, total){}, onComplete: function(id, fileName, response){}, onCancel: function(id, fileName){}, onUpload: function(id, fileName, xhr){} }; qq.extend(this._options, o);   this._queue = []; // params for files in queue this._params = []; }; qq.UploadHandlerAbstract.prototype = { log: function(str){ if (this._options.debug && window.console) console.log('[uploader] ' + str); }, /**   * Adds file or file input to the queue   * @returns id   **/ add: function(file){}, /**   * Sends the file identified by id and additional query params to the server   */ upload: function(id, params){ var len = this._queue.push(id);   var copy = {}; qq.extend(copy, params); this._params[id] = copy;   // if too many active uploads, wait... if (len <= this._options.maxConnections){ this._upload(id, this._params[id]); } }, /**   * Cancels file upload by id   */ cancel: function(id){ this._cancel(id); this._dequeue(id); }, /**   * Cancells all uploads   */ cancelAll: function(){ for (var i=0; i<this._queue.length; i++){ this._cancel(this._queue[i]); } this._queue = []; }, /**   * Returns name of the file identified by id   */ getName: function(id){}, /**   * Returns size of the file identified by id   */ getSize: function(id){}, /**   * Returns id of files being uploaded or   * waiting for their turn   */ getQueue: function(){ return this._queue; }, /**   * Actual upload method   */ _upload: function(id){}, /**   * Actual cancel method   */ _cancel: function(id){}, /**   * Removes element from queue, starts upload of next   */ _dequeue: function(id){ var i = qq.indexOf(this._queue, id); this._queue.splice(i, 1);   var max = this._options.maxConnections;   if (this._queue.length >= max && i < max){ var nextId = this._queue[max-1]; this._upload(nextId, this._params[nextId]); } } };   /**  * Class for uploading files using form and iframe  * @inherits qq.UploadHandlerAbstract  */ qq.UploadHandlerForm = function(o){ qq.UploadHandlerAbstract.apply(this, arguments);   this._inputs = {}; }; // @inherits qq.UploadHandlerAbstract qq.extend(qq.UploadHandlerForm.prototype, qq.UploadHandlerAbstract.prototype);   qq.extend(qq.UploadHandlerForm.prototype, { add: function(fileInput){ fileInput.setAttribute('name', this._options.inputName); var id = 'qq-upload-handler-iframe' + qq.getUniqueId();   this._inputs[id] = fileInput;   // remove file input from DOM if (fileInput.parentNode){ qq.remove(fileInput); }   return id; }, getName: function(id){ // get input value and remove path to normalize return this._inputs[id].value.replace(/.*(\/|\\)/, ""); }, _cancel: function(id){ this._options.onCancel(id, this.getName(id));   delete this._inputs[id];   var iframe = document.getElementById(id); if (iframe){ // to cancel request set src to something else // we use src="javascript:false;" because it doesn't // trigger ie6 prompt on https iframe.setAttribute('src', 'javascript:false;');   qq.remove(iframe); } }, _upload: function(id, params){ this._options.onUpload(id, this.getName(id), false); var input = this._inputs[id];   if (!input){ throw new Error('file with passed id was not added, or already uploaded or cancelled'); }   var fileName = this.getName(id);   var iframe = this._createIframe(id); var form = this._createForm(iframe, params); form.appendChild(input);   var self = this; this._attachLoadEvent(iframe, function(){ self.log('iframe loaded');   var response = self._getIframeContentJSON(iframe);   self._options.onComplete(id, fileName, response); self._dequeue(id);   delete self._inputs[id]; // timeout added to fix busy state in FF3.6 setTimeout(function(){ qq.remove(iframe); }, 1); });   form.submit(); qq.remove(form);   return id; }, _attachLoadEvent: function(iframe, callback){ qq.attach(iframe, 'load', function(){ // when we remove iframe from dom // the request stops, but in IE load // event fires if (!iframe.parentNode){ return; }   // fixing Opera 10.53 if (iframe.contentDocument && iframe.contentDocument.body && iframe.contentDocument.body.innerHTML == "false"){ // In Opera event is fired second time // when body.innerHTML changed from false // to server response approx. after 1 sec // when we upload file with iframe return; }   callback(); }); }, /**   * Returns json object received by iframe from server.   */ _getIframeContentJSON: function(iframe){ // iframe.contentWindow.document - for IE<7 var doc = iframe.contentDocument ? iframe.contentDocument: iframe.contentWindow.document, response;   this.log("converting iframe's innerHTML to JSON"); this.log("innerHTML = " + doc.body.innerHTML);   try { response = eval("(" + doc.body.innerHTML + ")"); } catch(err){ response = {}; }   return response; }, /**   * Creates iframe with unique name   */ _createIframe: function(id){ // We can't use following code as the name attribute // won't be properly registered in IE6, and new window // on form submit will open // var iframe = document.createElement('iframe'); // iframe.setAttribute('name', id);   var iframe = qq.toElement('<iframe src="javascript:false;" name="' + id + '" />'); // src="javascript:false;" removes ie6 prompt on https   iframe.setAttribute('id', id);   iframe.style.display = 'none'; document.body.appendChild(iframe);   return iframe; }, /**   * Creates form, that will be submitted to iframe   */ _createForm: function(iframe, params){ // We can't use the following code in IE6 // var form = document.createElement('form'); // form.setAttribute('method', 'post'); // form.setAttribute('enctype', 'multipart/form-data'); // Because in this case file won't be attached to request var form = qq.toElement('<form method="post" enctype="multipart/form-data"></form>');   var queryString = qq.obj2url(params, this._options.action);   form.setAttribute('action', queryString); form.setAttribute('target', iframe.name); form.style.display = 'none'; document.body.appendChild(form);   return form; } });   /**  * Class for uploading files using xhr  * @inherits qq.UploadHandlerAbstract  */ qq.UploadHandlerXhr = function(o){ qq.UploadHandlerAbstract.apply(this, arguments);   this._files = []; this._xhrs = [];   // current loaded size in bytes for each file this._loaded = []; };   // static method qq.UploadHandlerXhr.isSupported = function(){ var input = document.createElement('input'); input.type = 'file';   return ( 'multiple' in input && typeof File != "undefined" && typeof (new XMLHttpRequest()).upload != "undefined" ); };   // @inherits qq.UploadHandlerAbstract qq.extend(qq.UploadHandlerXhr.prototype, qq.UploadHandlerAbstract.prototype)   qq.extend(qq.UploadHandlerXhr.prototype, { /**   * Adds file to the queue   * Returns id to use with upload, cancel   **/ add: function(file){ if (!(file instanceof File)){ throw new Error('Passed obj in not a File (in qq.UploadHandlerXhr)'); }   return this._files.push(file) - 1; }, getName: function(id){ var file = this._files[id]; // fix missing name in Safari 4 return file.fileName != null ? file.fileName : file.name; }, getSize: function(id){ var file = this._files[id]; return file.fileSize != null ? file.fileSize : file.size; }, /**   * Returns uploaded bytes for file identified by id   */ getLoaded: function(id){ return this._loaded[id] || 0; }, /**   * Sends the file identified by id and additional query params to the server   * @param {Object} params name-value string pairs   */ _upload: function(id, params){ this._options.onUpload(id, this.getName(id), true);   var file = this._files[id], name = this.getName(id), size = this.getSize(id);   this._loaded[id] = 0;   var xhr = this._xhrs[id] = new XMLHttpRequest(); var self = this;   xhr.upload.onprogress = function(e){ if (e.lengthComputable){ self._loaded[id] = e.loaded; self._options.onProgress(id, name, e.loaded, e.total); } };   xhr.onreadystatechange = function(){ if (xhr.readyState == 4){ self._onComplete(id, xhr); } };   // build query string params = params || {}; params[this._options.inputName] = name; var queryString = qq.obj2url(params, this._options.action);   xhr.open("POST", queryString, true); xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest"); xhr.setRequestHeader("X-File-Name", encodeURIComponent(name)); xhr.setRequestHeader("Content-Type", "application/octet-stream"); xhr.send(file); }, _onComplete: function(id, xhr){ // the request was aborted/cancelled if (!this._files[id]) return;   var name = this.getName(id); var size = this.getSize(id);   this._options.onProgress(id, name, size, size);   if (xhr.status == 200){ this.log("xhr - server response received"); this.log("responseText = " + xhr.responseText);   var response;   try { response = eval("(" + xhr.responseText + ")"); } catch(err){ response = {}; }   this._options.onComplete(id, name, response);   } else { this._options.onComplete(id, name, {}); }   this._files[id] = null; this._xhrs[id] = null; this._dequeue(id); }, _cancel: function(id){ this._options.onCancel(id, this.getName(id));   this._files[id] = null;   if (this._xhrs[id]){ this._xhrs[id].abort(); this._xhrs[id] = null; } } });

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Comme vous pouvez le voir, il est dense..! Je fais appel à la fonction qq.FileUploader dans ma page php comme préconisé de la manière suivante, en ajoutant quelques options :

Code:

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<script> var uploader = new qq.FileUploader({ // pass the dom node (ex. $(selector)[0] for jQuery users) element: document.getElementById('file-uploader'), // path to server-side upload script debug:true, action: '/server/upload-image-annonce.php', sizeLimit: 1024*1024*5, //5Mo minsizeLimit: 1024*1 , //1Ko allowedExtensions: ["jpg", "jpeg","bmp", "png", "gif"] }); </script>

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Le script JS fait lui même appel à une page php côté serveur qui se charge de l'upload et du transfert des images. Le voici :

Code:

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<?php   /**  * Handle file uploads via XMLHttpRequest  */ class qqUploadedFileXhr { /**   * Save the file to the specified path   * @return boolean TRUE on success   */ function save($path) { $input = fopen("php://input", "r"); $temp = tmpfile(); $realSize = stream_copy_to_stream($input, $temp); fclose($input);   if ($realSize != $this->getSize()){ return false; }   $target = fopen($path, "w"); fseek($temp, 0, SEEK_SET); stream_copy_to_stream($temp, $target); fclose($target);   return true; } function getName() { return $_GET['qqfile']; } function getSize() { if (isset($_SERVER["CONTENT_LENGTH"])){ return (int)$_SERVER["CONTENT_LENGTH"]; } else { throw new Exception('Getting content length is not supported.'); } } }   /**  * Handle file uploads via regular form post (uses the $_FILES array)  */ class qqUploadedFileForm { /**   * Save the file to the specified path   * @return boolean TRUE on success   */ function save($path) { if(!move_uploaded_file($_FILES['qqfile']['tmp_name'], $path)){ return false; } return true; } function getName() { return $_FILES['qqfile']['name']; } function getSize() { return $_FILES['qqfile']['size']; } }   class qqFileUploader { private $allowedExtensions = array(); private $sizeLimit = 10485760; private $file;   function __construct(array $allowedExtensions = array(), $sizeLimit = 10485760){ $allowedExtensions = array_map("strtolower", $allowedExtensions);   $this->allowedExtensions = $allowedExtensions; $this->sizeLimit = $sizeLimit;   $this->checkServerSettings();   if (isset($_GET['qqfile'])) { $this->file = new qqUploadedFileXhr(); } elseif (isset($_FILES['qqfile'])) { $this->file = new qqUploadedFileForm(); } else { $this->file = false; } }   private function checkServerSettings(){ $postSize = $this->toBytes(ini_get('post_max_size')); $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));   if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){ $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M'; die("{'error':'increase post_max_size and upload_max_filesize to $size'}"); } }   private function toBytes($str){ $val = trim($str); $last = strtolower($str[strlen($str)-1]); switch($last) { case 'g': $val *= 1024; case 'm': $val *= 1024; case 'k': $val *= 1024; } return $val; }   /**   * Returns array('success'=>true) or array('error'=>'error message')   */ function handleUpload($uploadDirectory, $replaceOldFile = FALSE){ if (!is_writable($uploadDirectory)){ return array('error' => "Server error. Upload directory isn't writable."); }   if (!$this->file){ return array('error' => 'No files were uploaded.'); }   $size = $this->file->getSize();   if ($size == 0) { return array('error' => 'File is empty'); }   if ($size > $this->sizeLimit) { return array('error' => 'File is too large'); }   $pathinfo = pathinfo($this->file->getName()); $filename = $pathinfo['filename']; //$filename = md5(uniqid()); $ext = $pathinfo['extension'];   if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){ $these = implode(', ', $this->allowedExtensions); return array('error' => 'File has an invalid extension, it should be one of '. $these . '.'); }   if(!$replaceOldFile){ /// don't overwrite previous files that were uploaded while (file_exists($uploadDirectory . $filename . '.' . $ext)) { $filename .= rand(10, 99); } }   if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){ return array('success'=>true); } else { return array('error'=> 'Could not save uploaded file.' . 'The upload was cancelled, or server error encountered'); } } }   // list of valid extensions, ex. array("jpeg", "xml", "bmp") $allowedExtensions = array("jpeg", "jpg", "gif", "bmp", "png"); // max file size in bytes $sizeLimit = 5 * 1024 * 1024;   $uploader = new qqFileUploader($allowedExtensions, $sizeLimit); $result = $uploader->handleUpload('uploads/'); // to pass data through iframe you will need to encode all html tags echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);

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Alors maintenant mes questions:

Commençons par une question simple, c'est quoi "XMLHttpRequest" et quand est-ce que la fonction php du script server "qqUploadedFileXhr" sera appellée plutôt que "qqUploadedFileForm" qui m'est plus famillière et qui fait la même chose ?

Ensuite, j'aimerais limiter l'upload (en JS et en PHP bien sûr pour plus de sécurité) à 3 images maximum. Le JS est tellement dense,je ne m'y retrouve pas. Comment faire cela ?