Computerhilfen tech-tips

Javascript can be used to quickly count the length of a string: This works similar to the strlen() function in PHP. So you know if a string contains 2, 3 or 255 characters.var string = 'this is a string';var strlength = string.length;The function to determine the length of a string with Javascript is called "length": To determine the length of the string, simply append the function to the string variable. The variable "strlength" in the examp... Read more...

PHP comes with the "striptags" function, with which you can easily remove all HTML commands from a text. In Javascript there is no command for this, but you can do the same with a little trick! This is important, for example, to process a text further, or just to count words and letters. Javascript: Remove HTML commandsJavascript does not have its own function to delete HTML commands from a value or variable. But that doesn't matter, you ... Read more...

Print out the paper template and put it onto your Raspberry's GPIO ports: This way you'll always know what each pin does!Download: GPIO Pin templateThis sketch gives an overview of the GPIO pins (General Purpose in / Out) of the Raspberry Pi: While some of the pins supply 3.3V or 5V current, others can be controlled by software: Here the status can be queried with a program or current can be sent on request: for example, a connected LED can set... Read more...

Google games are interactive Google doodles that are displayed on special occasions and only for one day. Here we show you the best of the hidden games on the Google website: Google made a lot of effort with it's Pac-Man game for the 30th birthday of Pacman, but also the Pony Express or the celebration of the Brazilian Valentine's Day are great and fun! Google Games and interactive doodles:.spiele { font-size:15px;}@media screen and (max... Read more...

With SSH (Secure Shell) you can control your Raspberry Pi remotely over the network without a monitor and keyboard attached: Just open your SSH application on your computer and connect with the Raspberry (click here to learn how to connect with the Raspberry via SSH!). For safety reasons, SSH is disabled by default but there are two easy ways to enable it! Enable SSH on a Raspberry Pi without a monitorYou can simply copy an empty text-file o... Read more...

If you up- or downloaded something onto the Raspberry or changed some files and don't see your changes after a reboot, there might be a problem which requires immediate action: Otherwise you could risk to loose your data on the mini computer!One symptom of a failing SD card (or a micro SD card) is that it could become read-only: While still appearing normal to you and the Raspberry's operating system, all changes are only made in the Raspberry's ca... Read more...

If your linux computer (a Raspberry Pi running Raspbian but also a desktop pc with Ubuntu or Debian) has problems to reboot or shutdown, this tip might help! You also should make sure to backup your data: In our case it was a sign that the Raspberry's SD card was dying!» Deutsche Version hier! This is how it looks like: If you want to restart the computer with a "sudo rebo... Read more...

The newest version of Microsoft's Edge browser uses the Chromium engine (just like Google Chrome). It now also comes with a Dark Mode, that is available in the new Canary Version. But: Before you can use it, it has to be activated in a hidden settings menu.Download new Edge Browser (Beta)!After downloading and installing you can change the settings by typing "edge://flags" in the address bar. After that, search for "themes": Here you can enable... Read more...

Since May the 4th., Firefox disabled many of the installed add-ons: This was caused by an outdated security certificate that the add-ons relied on. Until the Firefox developers offer a patch for the problem, we have here a quick fix to make the add-ons work again! Activate Firefox Add-ons again!To make the add-ons work again, you can change a setting in the advanced setting tab of the Firefox browser. Therefore, start the Firefox and enter t... Read more...

GIF animations can loop for ever or play only a given amount of times: It is possible to play the animation only once without looping. Every frame can have it's own color palette and duration time: This makes the GIF animation a nice tool to animate elements on a web page. With a modern browser there are some flaws, though: The browser will cache the GIF file. If you reload the page, it will only show the last frame and not the entire animation again!&... Read more...