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function BinaryFileUploader(o) {
this.options = null;
this._defaultOptions = {
element: null, // HTML file element
onFileLoad: function(file) {
console.log(file.toString());
}
};
this._init = function(o) {
if (!this.hasFileUploaderSupport()) return;
this._verifyDependencies();
this.options = this._mergeObjects(this._defaultOptions, o);
this._verifyOptions();
this.addFileChangeListener();
}
this.hasFileUploaderSupport = function() {
return !!(window.File && window.FileReader && window.FileList && window.Blob);
}
this.addFileChangeListener = function() {
this.options.element.addEventListener(
'change',
this._bind(this, this.onFileChange)
);
}
this.onFileChange = function(e) {
// TODO accept multiple files
var file = e.target.files[0],
reader = new FileReader();
reader.onload = this._bind(this, this.onFileLoad);
reader.readAsBinaryString(file);
}
this.onFileLoad = function(e) {
var content = e.target.result,
string = new BinaryString(content);
this.options.onFileLoad(string);
}
this._mergeObjects = function(starting, override) {
var merged = starting;
for (key in override) merged[key] = override[key];
return merged;
}
this._verifyOptions = function() {
if (!(this.options.element && this.options.element.type && this.options.element.type === 'file')) {
throw 'Invalid element param in options. Must be a file upload DOM element';
}
if (typeof this.options.onFileLoad !== 'function') {
throw 'Invalid onFileLoad param in options. Must be a function';
}
}
this._verifyDependencies = function() {
if (!window.BinaryString) throw 'BinaryString is missing. Check that you\'ve correctly included it';
}
// helper function for binding methods to objects
this._bind = function(object, method) {
return function() {return method.apply(object, arguments);};
}
this._init(o);
}