Four Cool Ajax Plugins for WordPress
WordPress and all other popular blogging packages have many features specifically designed to make conversations between authors and readers as easy as possible. If you are used to instant messaging, however, you may think nothing is better than instant messaging for a quick on-line conversation. Don't worry; there's no need to leave your beloved WordPress home page to have such conversations. The Ajax-based Wordspew/Shoutbox plugin adds real-time chat functionality to any WordPress Web site. Installation is possibly the simplest one of all the plugins described in this article: unpack the tarball in the WordPress plugins directory, and call Shoutbox with this line of code in the piece of the theme where you want it to appear:
<?php jal_get_shoutbox(); ?>
Figure 4 shows the result. Whenever anyone writes some text in the Message input field, everyone else who is visiting the home page at that moment will see it, without doing anything, the next time the Shoutbox area refreshes itself, and everyone will be able to answer in the same way. Shoutbox users also can add their name and home URL, if they choose, as well as use emoticons or links in the message text.
The scrollbar on the right allows newcomers to follow the whole conversation (Figure 5). The refresh interval is programmable. When it expires, new posts appear highlighted in a different color, which then fades away in the background after an equally programmable interval.
Almost everything else in the Shoutbox is configurable. You can set all the options from the Manage→Live Shoutbox page. The screenshots here show the vanilla version, but you can change the colors of user names, text and background of all comments. Even the one-line input area can be replaced with a larger field, but this obviously uses more space and may ruin the overall layout of your pages. One Shoutbox feature you might want to disable as soon as possible is the sound alert when new messages are loaded. You don't want your coworkers to know when you're chatting in your browser, do you?
Security-conscious readers will immediately spot the potential for abuse here, but Shoutbox has two configurable mechanisms to prevent spammers from filling it with garbage. One is a place (Options→Discussion→Comments moderation) where you can enter a list of banned words, URLs and sentences. The package includes a sample word list; to add new ones, simply type them in the right place on the list. People trying to use banned words will see the alert box shown in Figure 6. The drawback in using the banned word list is that it requires continuous monitoring and maintenance. To avoid this burden, it is much better, without giving up the list itself, to set Shoutbox to accept comments only from registered users. Anonymous visitors still will be able to see the chat in progress.
Besides English, the Wordspew Shoutbox is also available in about ten other European languages. If your language is already supported, simply download the corresponding PO-MO files from the plugin home page, and place them in the Wordspew folder on the server. Otherwise, the author welcomes localizations in other languages.
Ajax still is a relatively new technology. Depending on which WordPress version you run, how you configured it and which theme you chose, you may experience messed-up internal links, misaligned blocks or similar problems if you download everything described in this article and simply drop it in your WordPress installation.
One reason for these issues is the simple fact that all these plugins are still under active development. In the Calendar version (0.8.3) we tested, for example, one php tag was missing (surely due to a typing mistake before packaging) from the source file called ajaxcalendarscript.php. To make it work, we had to replace <? with <?php on line 89 of that file. Surely all the plugins will have more stable interfaces by the time you read this article.
Articles about Digital Rights and more at http://stop.zona-m.net CV, talks and bio at http://mfioretti.com
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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- SUSE LLC's SUSE Manager
- My +1 Sword of Productivity
- Tech Tip: Really Simple HTTP Server with Python
- Managing Linux Using Puppet
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Non-Linux FOSS: Caffeine!
- Returning Values from Bash Functions
- Rogue Wave Software's Zend Server
- Doing for User Space What We Did for Kernel Space
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide