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