118 lines
3.6 KiB
JavaScript
118 lines
3.6 KiB
JavaScript
// Backbone.Model File Upload v0.1
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// by Joe Vu - joe.vu@homeslicesolutions.com
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// For all details and documentation:
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// https://github.com/homeslicesolutions/backbone-model-file-upload
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!function(_, Backbone){
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// Clone the original Backbone.Model.prototype
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var backboneModelClone = _.clone( Backbone.Model.prototype );
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// Extending out
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_.extend(Backbone.Model.prototype, {
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// ! Default file attribute - can be overwritten
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fileAttribute: 'file',
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// @ Save - overwritten
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save: function(key, val, options) {
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// Variables
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var attrs, attributes = this.attributes;
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// Signature parsing - taken directly from original Backbone.Model.save
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// and it states: 'Handle both "key", value and {key: value} -style arguments.'
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if (key == null || typeof key === 'object') {
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attrs = key;
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options = val;
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} else {
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(attrs = {})[key] = val;
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}
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// Validate & wait options - taken directly from original Backbone.Model.save
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options = _.extend({validate: true}, options);
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if (attrs && !options.wait) {
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if (!this.set(attrs, options)) return false;
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} else {
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if (!this._validate(attrs, options)) return false;
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}
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if (attrs && options.wait) {
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this.attributes = _.extend({}, attributes, attrs);
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}
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// Check for "formData" flag and check for if file exist.
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if ( options.formData === true
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|| options.formData !== false
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&& this.attributes[ this.fileAttribute ]
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&& this.attributes[ this.fileAttribute ] instanceof File ) {
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// Flatten Attributes reapplying File Object
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var formAttrs = _.clone( this.attributes ),
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fileAttr = this.attributes[ this.fileAttribute ];
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formAttrs = this._flatten( formAttrs );
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formAttrs[ this.fileAttribute ] = fileAttr;
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// Converting Attributes to Form Data
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var formData = new FormData();
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_.each( formAttrs, function( value, key ){
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formData.append( key, value );
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});
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// Set options for AJAX call
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options = options || {};
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options.data = formData;
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options.processData = false;
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options.contentType = false;
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// Apply custom XHR for processing status & listen to "progress"
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var that = this;
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options.xhr = function() {
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var xhr = $.ajaxSettings.xhr();
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xhr.upload.addEventListener('progress', function(){
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that._progressHandler.apply(that, arguments);
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}, false);
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return xhr;
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}
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}
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// Resume back to original state
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if (attrs && options.wait) this.attributes = attributes;
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// Continue to call the existing "save" method
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return backboneModelClone.save.call(this, attrs, options);
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},
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// _ FlattenObject gist by "penguinboy". Thank You!
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// https://gist.github.com/penguinboy/762197
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_flatten: function( obj ) {
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var output = {};
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for (var i in obj) {
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if (!obj.hasOwnProperty(i)) continue;
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if (typeof obj[i] == 'object') {
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var flatObject = this._flatten(obj[i]);
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for (var x in flatObject) {
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if (!flatObject.hasOwnProperty(x)) continue;
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output[i + '.' + x] = flatObject[x];
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}
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} else {
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output[i] = obj[i];
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}
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}
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return output;
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},
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// _ Get the Progress of the uploading file
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_progressHandler: function( event ) {
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if (event.lengthComputable) {
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var percentComplete = event.loaded / event.total;
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this.trigger( 'progress', percentComplete );
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}
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}
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});
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}(_, Backbone);
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