Base64 conversion of selected file in SAPUI5

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I have made example of base64 conversion of any selected file,below I have shown Application Structure,View Part,Controller Part and Result.Go through it and please let me know in case of any issue/doubt.

Application Structure 

View Part

<mvc:View controllerName="Base64.controller.S1" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:mvc="sap.ui.core.mvc" displayBlock="true"

xmlns="sap.m" xmlns:u="sap.ui.unified" xmlns:l="sap.ui.layout">

<App id="idAppControl">

<pages>

<Page title="{i18n>title}">

<content>

<l:VerticalLayout>

<u:FileUploader name="myFileUpload" tooltip="Upload your file to the local server" change="handleSelectFile"/>

</l:VerticalLayout>

</content>

</Page>

</pages>

</App>

</mvc:View>

Controller Part

sap.ui.define([

"sap/ui/core/mvc/Controller"

], function (Controller) {

"use strict";

return Controller.extend("Base64.controller.S1", {

      

      // When user select the file then this method will call....

handleSelectFile: function (oEvent) {

var fileDetails = oEvent.getParameters("file").files[0];

sap.ui.getCore().fileUploadArr = [];

if (fileDetails) {

var mimeDet = fileDetails.type,

fileName = fileDetails.name;

// Calling method....

this.base64coonversionMethod(mimeDet, fileName, fileDetails, "001");

} else {

sap.ui.getCore().fileUploadArr = [];

}

},

// Base64 conversion of selected file(Called method)....

base64coonversionMethod: function (fileMime, fileName, fileDetails, DocNum) {

var that = this;

if (!FileReader.prototype.readAsBinaryString) {

FileReader.prototype.readAsBinaryString = function (fileData) {

var binary = "";

var reader = new FileReader();

reader.onload = function (e) {

var bytes = new Uint8Array(reader.result);

var length = bytes.byteLength;

for (var i = 0; i < length; i++) {

binary += String.fromCharCode(bytes[i]);

}

that.base64ConversionRes = btoa(binary);

sap.ui.getCore().fileUploadArr.push({

"DocumentType": DocNum,

"MimeType": fileMime,

"FileName": fileName,

"Content": that.base64ConversionRes,

});

};

reader.readAsArrayBuffer(fileData);

};

}

var reader = new FileReader();

reader.onload = function (readerEvt) {

var binaryString = readerEvt.target.result;

that.base64ConversionRes = btoa(binaryString);

sap.ui.getCore().fileUploadArr.push({

"DocumentType": DocNum,

"MimeType": fileMime,

"FileName": fileName,

"Content": that.base64ConversionRes,

});

};

reader.readAsBinaryString(fileDetails);

},

});

});

Result

See the property name 'Content' in console(developer tool),That is the Base64 converted string.