Ralph's Blog about this and that (RSS | Atom)

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Adding speech recognition to an Ionic App

Published: December 18, 2017  •  Updated: July 16, 2019  •  ionic, javascript, java, spring

In this blog post I present three different way how to integrate a speech recognition functionality into an Ionic app. With a Cordova plugin, the Web Speech API and with RecordRTC and the Google Cloud Speech API.

Workbox with Ionic 3 and Lazy Loaded Modules

Published: December 17, 2017  •  Updated: April 17, 2018  •  ionic3, pwa

How to integrate the service worker library Workbox into an Ionic 3 app with lazy loaded modules

Developing a self-hosted location tracker

Published: November 07, 2017  •  Updated: December 05, 2018  •  ionic, java, spring, javascript

In this blog post, we create a self-hosted location tracker that consists of three parts. An Ionic/Cordova application that continuously sends the current location to a Spring Boot application from where the locations are broadcasted to a website and visualized on Google Maps.

Ionic 3 with Workbox Service Worker

Published: November 05, 2017  •  Updated: April 22, 2018  •  pwa, ionic3, javascript

Creating Service Workers with Workbox for Ionic 3 applications

Dynamically loading position data with Ionic and Spring Boot

Published: November 05, 2017  •  Updated: December 03, 2018  •  ionic, java, spring, javascript

In this blog post we create an Ionic app that dynamically requests location data points from a Spring Boot server and displays them on an OpenStreetMap map. The data points are stored in a MongoDB database, and we take advantage of the geospatial query support to read the data points only for a certain area.

JCE policy changes in Java SE 8u151, 8u152 and 8u162

Published: October 21, 2017  •  Updated: January 17, 2018  •  java

The latest Java update changed the way how you enable unlimited cryptography in your Java application.

Upload files from Ionic to Spring Boot with Flow.js

Published: September 26, 2017  •  Updated: December 04, 2018  •  java, ionic, javascript, spring

A closer look at the Flow.js JavaScript library that helps upload files from a browser to the server. Flow.js is a JavaScript library providing multiple simultaneous, stable, fault-tolerant, and resumable/restartable file uploads via the HTML5 File API.

A closer look at the Web Cryptography API

Published: September 25, 2017  •  Updated: December 04, 2018  •  javascript, cryptography, ionic

Creating a trivial password manager with the Web Cryptography API and the Ionic framework.

Spring Boot and Ionic application development with OpenAPI

Published: September 21, 2017  •  Updated: December 04, 2018  •  spring, java, javascript, ionic

In this blog, we create REST services in Spring Boot and consume them in an Ionic app. We use the OpenAPI specification for generating API documentation and the client TypeScript code.

Pluggable file systems in Java

Published: September 17, 2017  •  Updated: February 16, 2018  •  java

How to use pluggable file systems in Java and a look at implementations outside the standard library

Do it yourself Multi Value Map with Java 8

Published: September 16, 2017  •  Updated: October 25, 2017  •  java

How to create a simple MultiValue Map with Java 8

Offline capable Ionic Web App with IndexedDB

Published: September 15, 2017  •  Updated: December 03, 2018  •  database, javascript, ionic

Example of an Ionic web application that stores data in an IndexedDB and works offline.

A closer look at IndexedDB

Published: September 12, 2017  •  Updated: October 30, 2017  •  database, javascript

IndexedDB, the database in the browser. How does it work and what can you do with it.

Server-Sent Events with Spring

Published: March 05, 2017  •  Updated: February 16, 2018  •  java, spring

What are Server-Sent Events and how can you send them from a Spring Boot application

Lovefield, a SQL database engine for the web

Published: February 27, 2017  •  Updated: November 29, 2018  •  database, ionic, javascript

A short introduction to Lovefield, a JavaScript SQL database engine. And how to build an Ionic app that uses Lovefield as database access layer.

Sending push messages from Spring Boot to Ionic over FCM

Published: February 26, 2017  •  Updated: March 31, 2020  •  ionic, spring, javascript, java

This post describes how a Spring Boot can send messages over FCM to an Ionic / Cordova app

Integrate ECharts into an Ionic app

Published: February 22, 2017  •  Updated: September 29, 2018  •  ionic, javascript

In this post, we look at a way to display charts from the ECharts library in an Ionic app

Secure Todo app with Ionic

Published: February 18, 2017  •  Updated: December 06, 2018  •  ionic, cryptography

In this post, we create a Todo application with Ionic that stores the data encrypted in the client storage. asmcrypto.js is used as the cryptographic library and we have a look at the Web Crypto API

Uploading files from Ionic / Cordova to Minio / S3

Published: February 16, 2017  •  Updated: December 06, 2018  •  ionic, cordova, spring, s3, javascript, java

How to upload files from an Ionic / Cordova app directly to a Minio server or Amazon S3 with pre-signed URLs.

Upload files from Java to a Minio server

Published: February 15, 2017  •  Updated: February 16, 2018  •  java, s3

In this article, we take a closer look at Minio, a self-hosted S3 compatible server, and how to connect a Java application to it.

Uploading pictures from Ionic / Cordova to Spring Boot

Published: February 12, 2017  •  Updated: December 06, 2018  •  ionic, cordova, spring, javascript, java

In this article, we create an Ionic application where the user can take a picture, and the app uploads it to a Spring Boot application.

JWT Authentication with Ionic/Angular and Spring Boot

Published: February 05, 2017  •  Updated: December 07, 2018  •  ionic, spring, java, javascript

How to implement a JWT authentication system with Ionic/Angular and Spring Boot.

Form validation with Angular and Spring Boot

Published: January 26, 2017  •  Updated: December 04, 2018  •  angular, ionic, spring, java, javascript

Example of form validation in an Ionic application. How to create custom synchronous and asynchronous validators and how to validate data on the server with the Java Bean Validation framework.

Produce RSS and Atom feeds with Spring framework

Published: January 24, 2017  •  Updated: February 16, 2018  •  spring, java

How to create RSS and Atom feeds with the Spring Framework and the ROME library

A look at Angular's ngFor directive

Published: January 22, 2017  •  Updated: December 05, 2017  •  angular, javascript

Storing data with localStorage and Lockr

Published: January 20, 2017  •  Updated: June 19, 2017  •  database, javascript

Hot deploy updates with the cordova-hot-code-push plugin

Published: January 18, 2017  •  Updated: May 18, 2017  •  ionic3, cordova

Hot deploy updates to Ionic / Cordova apps with CodePush

Published: January 16, 2017  •  Updated: December 07, 2017  •  ionic, cordova

Consume Protocol Buffer messages with Ionic

Published: January 14, 2017  •  Updated: December 01, 2018  •  ionic, spring, java, javascript

Hot deploy updates to Ionic / Cordova apps with Ionic Appflow Live Deploy

Published: January 13, 2017  •  Updated: December 07, 2018  •  ionic, cordova

Protocol Buffers with Spring Integration

Published: January 08, 2017  •  Updated: December 23, 2017  •  java, spring

Upgrade Font Awesome in an Ext JS 6 application

Published: January 04, 2017  •  extjs

JavaScript Date and moment.js

Published: January 04, 2017  •  Updated: October 25, 2017  •  javascript