AJAX, jQuery & how to bypass the same-origin policy

Posted by Raffael on 09/08/202109/08/2021 Posted in HTML, JavaScript, PHP, Programming, Tutorials, Wiki Tagged ajax, cors, jQuery, same origin policy, sop, sop bypass

AJAX und Cross-Domain Today’s post is intended to give a brief introduction to the topic of AJAX with jQuery, as well as to cover the topic of cross domain (policy) and to show how you can use small tricks to send AJAX requests across multiple domains. Before we start, however, we will give you a quick introduction to the topic. If you are already familiar with the topic and are only interested in the AJAX cross-domain workaround, you can safely skip the first part of the article.
What is AJAX and how does it work in jQuery?
AJAX is an abbreviation and stands for “Asynchronous JavaScript And XML”. Contrary to the opinion of some people on the Internet, it is not a programming language, but rather a pattern, i.e. a way of programming something. By means of AJAX web content can be retrieved via Javascript, […]

Open SAP GUI from HTML out of your webbrowser

Posted by Raffael on 11/12/201511/12/2015 Posted in HTML, JavaScript, SAP Tagged open SAP from browser, open SAP GUI from html, SAP, SAP GUI

SAP aus Browser aufrufen Some time ago I got into a discussion about whether it is possible to open transactions in the SAP GUI out of the browser. The opinion of the colleagues was unanimous – start SAP GUI from browser is something not be done.
However I have maintained and created a small proof-of-concept. Because it works. Ok, it’s not pretty, but it works. And that’s how to call the SAP GUI from the browser.
sapshcut.exe and what you can do with it
The solution works (among other things) using the sapshcut.exe (short for SAP Shortcut). This .exe file allows to start the SAP GUI parameterized. The possible parameters ranging from user via logon language up to the executed transaction. A complete list of possible parameters can be obtained by calling the sapshcut.exe with the parameter -?. (See screenshots below.)
sapshcut.exe - help from cmd

How to implement your own social media buttons

Posted by Raffael on 12/14/201305/08/2014 Posted in HTML, JavaScript, PHP, Tutorials, Wordpress Tagged Custom Like button, Gravatar, jQuery, JSON, Like-Button, Like-Counter, Share-Button

Nowadays you will hardly find a website without it. What is it what I’m taling about? Did you already guess it? I mean Like buttons, Share buttons, Like counter, avatars, etc. – if you look at today’s network landscape, it’s hard to imagine that there was a time before all that fancy stuff.
And that’s why I want to show you today how to install functionalities like Facebook’s share button, Twitter’s tweet button and counter, as well as Gravatar’s user-image service. In the following tutorial you will learn how to implement these functionalities into your website.
I deliberately say “functionality” because I do not want to show you how to use the finished and standardised components, but how to address the core functionality, so you can afterwards operate quite freely, for example in the design of […]

RadioduinoWRT – a do it yourself webradio

Posted by Raffael on 11/05/201303/21/2015 Posted in Arduino, Hardware Hacks, HTML, OpenWrt, Personal stuff, PHP, Tutorials Tagged Arduino radio, Arduino web radio, MPC, MPD, OpenWrt, OpenWRT MPD, OpenWRT web radio, RadioduinoWRT, TP-Link WR703N, WR703N hacks, WR703N lighthttpd, WR703N lighttpd, WR703N web radio

RadioduinoWRT Today I want to present you one of my larger craft projects. This time it is not just about software, but also about the associated hardware. What is it? A web radio!
I like to listen to internet radio stations, but I didn’t want to run my pc only for listening to webradios. Connecting my phone to my stereo either wasn’t a solution, since I’d rather wear this with me, because I don’t want to run for each SMS / Whatsapp message to the music system. And because I always like to tinker, it was obvious to build a web radio as a standalone device myself.
As this article has become a bit longer, there is a brief overview of the following sections of the article, so that everyone can quickly find what he looks for.

What is the RadioduinoWRT?
Considerations before […]

How to pixelate images using Javascript

Posted by Raffael on 10/30/2013 Posted in HTML, JavaScript, Tutorials Tagged Close Pixelate, how to pixelate images with javascript, JavaScript, JS, JS Canvas, pixelated images with javascript, use js to pixelate

Today there is again a bit of Javascript code. The exact topic is about how you can pixelate images via Javascript. This has both advantages and drawbacks, which I would like to briefly point out once below.
Advantages:

Pixelation can be done dynamically (Manual effort in your graphics program falls away. Graphics must not be known beforehand.)
The computational power required is outsourced to the client side. In contrast to a server-side solutions (eg using PHP & Imagick), the computational load is distributed to the users. This helps to keep the server load low, if you have a lot of visitors.

Disadvantages:

The pixelation should be used rather as design or graphic effect, since the data is only sent not pixelated to the client. So if you really want to hide faces and picture information the pixelation still needs to be done before delivery […]