The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Web Development’ Category

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ls colour codes on OpenSuSE tumbleweed when accessed from Mac OS X ssh

Posted by jpluimers on 2019/06/07

`ls` colour codes

`ls` colour codes

I got confused as I thought red text would mean an error.

But they’re not: greenish yellow on a read background means error (a symbolic link to a place that’s no longer there).

It’s the output of https://github.com/gkotian/gautam_linux/blob/master/scripts/colours.sh as the one at

Actually the script is here https://raw.githubusercontent.com/gkotian/gautam_linux/master/scripts/colours.sh as the one at [WayBack] command line – What do the different colors mean in the terminal? – Ask Ubuntu failed with errors like this one:

-bash: *.xbm: bad substitution

The full script output is below.

Since various terminals have a different mapping from colours in the ANSI escape code colour table, I used the standard HTML colours using (which slightly differs from the Terminal.app screenshot on the right):

References:

Note that the shell on Mac OS X uses a different way of configuring colours CLICOLOR as described in [WayBack] settings – CLICOLOR and LS_COLORS in bash – Unix & Linux Stack Exchange. I might cover that another day.

Script output:

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Posted in *nix, *nix-tools, ANSI escape code, bash, CSS, Development, Encoding, HTML, HTML5, Linux, openSuSE, Power User, Software Development, SuSE Linux, Tumbleweed, Web Development | Leave a Comment »

Firefox 29 and up: “The connection has timed out”

Posted by jpluimers on 2019/04/24

A few years ago, Firefox changed the default “network.http.response.timeout” value from zero to 300 seconds (5 minutes).

Display style systems that show refreshing web pages, this can be a problem as when the connection to the web-server is unavailable for more than 5 minutes, then the page will show “The connection has timed out” and stop refreshing.

The solution – apart from fixing each and every connection problem – is to either restore the value or make it very long:

  • network.http.response.timeout=0
  • network.http.response.timeout=30000

Changing this works similarly like in A way to skip the Firefox “Well, this is embarrassing” during a sudden reboot « The Wiert Corner – irregular stream of stuff:

  • Open Firefox
  • Type about:config in the addressbar
  • Confirm the
    This might void your warranty!
    by clicking
    I accept the risk!
  • Search for network.http.response.timeout
  • Double click it so the value changes from the default value 0 to the user set value 0

–jeroen

Via:

Posted in Development, Firefox, Power User, Scripting, Software Development, Web Browsers, Web Development | Leave a Comment »

Lesson learned: do not copy/paste code from the `Visual` WordPress.com editor…

Posted by jpluimers on 2019/04/16

[WayBack] Lesson learned: do not copy/paste code from the Visual WordPress.com editor; copy from the Text editor or the Preview… – Jeroen Wiert Pluimers – Google+.

Note: likely the HTML below got rendered badly by WordPress.com, so the gist below has the same text as a MarkDown file.

Ever wonder why copy-pasting code from your WordPress.com post fails?

The first statement fails, but the second works:

[root@linux:/etc] # useradd --create-home --shell /bin/false autossh24
useradd: unrecognized option '--shell /bin/false'
...
[root@linux:/etc] # useradd --create-home --shell /bin/false autossh24
[root@linux:/etc] #

The reason is that the first is copied from the Visual WordPress.com editor that renders this HTML inserting   which is a different unicode characer (0x00A0) than a normal space (0x0020):

<blockquote><p><code data-mce-selected="1"># <strong>useradd --create-home --shell&nbsp;/bin/false autossh24</strong></code></p></blockquote>

However, the the second copied from the Text WordPress.com editor succeeds because it has all regular spaces:

<blockquote><code># <strong>useradd --create-home --shell /bin/false autossh24</strong></code></blockquote>

Luckily the Preview render is correct:

<blockquote><p><code># <strong>useradd --create-home --shell /bin/false autossh24</strong></code></p></blockquote>

Lesson learned: do not copy/paste code from the Visual WordPress.com editor; copy from the Text editor or the Preview.

–jeroen

[WayBack] Ever wonder why copy-pasting code from your WordPress.com post fails?

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Posted in Development, PHP, Scripting, SocialMedia, Software Development, Web Development, WordPress, WordPress | Leave a Comment »

debugging – Find what javascript changes the DOM? – Stack Overflow

Posted by jpluimers on 2019/04/01

I know I’m going to need this one day: [WayBack] debugging – Find what javascript changes the DOM? – Stack Overflow

Via: [WayBack] Javascript “Why”: Wenn ich eine fertig geladene Webseite sehe und wissen möchte, warum “dieses Element da” (Bild, Script, div) geladen worden ist, wie… – Kristian Köhntopp – Google+

–jeroen

Posted in Chrome, Development, JavaScript/ECMAScript, Power User, Scripting, Software Development, Web Browsers, Web Development | Leave a Comment »

GitHub – sdsalyer/gplus-archiver: A tool for exporting content from Google+

Posted by jpluimers on 2019/02/27

[WayBack] GitHub – sdsalyer/gplus-archiver: A tool for exporting content from Google+

Example saves: [WayBack] gplus-archiver

Via:

–jeroen

Posted in Development, G+: GooglePlus, PHP, Power User, Scripting, SocialMedia, Software Development, Web Development | Leave a Comment »

CDATA inside JavaScript or style section of HTML? They are for backward compatibility. Sometimes compatibility with ancient browsers.

Posted by jpluimers on 2019/01/23

As a back-end person, sometimes I wondered about CDATA in front-end HTML code was for, especially in JavaScript and CSS style elements.

[WayBack] HTML vs. XHTML – WHATWG Wiki explains how to be compatible with XHTML, HTML, XML based tools and older browsers:

The following code with escaping can ensure script and style elements will work in both XHTML and HTML, including older browsers.

In both cases, XML ignores the first comment and then uses the CDATA section to avoid the need for escaping special characters < and & within the rest of the contents (with subsequent JavaScript comments added within to ensure the HTML-oriented code is ignored by JavaScript).

In HTML, older browsers might display the content without the content being within a comment, so comments are used to hide this from them (while modern HTML browsers will run code inside the comments). The subsequent JavaScript comment is added to negate the text added for the sake of XHTML.

The <style> requires the /**/ comments since CSS does not support the single line ones.

   <!---->
       ...
   //-->

   <style type="text/css"><!--/*--><![CDATA[/*><!--*/
       ...
   /*]]>*/--></style>

If not concerned about much older browsers (from which one is hiding the HTML) one can use the simpler:

   //

   <style>/*<![CDATA[*/
   
   /*]]>*/</style>

Also note that the sequence “]]>” is not allowed within a CDATA section, so it cannot be used in true XHTML-embedded JavaScript without escaping.

–jeroen

via:

Posted in CSS, Development, HTML, HTML5, JavaScript/ECMAScript, Scripting, Software Development, Web Development | Leave a Comment »

some links that helped me fiddle with iframe elements

Posted by jpluimers on 2019/01/16

I need to document this properly later, but here are some links I used when fiddling with iframe elements:

A few things I learned:

  • You can either put the iframe elements in different divs then arrange the divs, or put a different ID on each iframe and arrange the iframe. In either case you will need a float: left; in your style and a width: 100vw in the div around all your frames.
  • Be aware that 100% isn’t 100% out of the box: default browser styles have a margin around your page and a border around an iframe.
    So you will need to fiddle with margin and border-width inside your styles for body and iframe. Easiest is to set them to none or 0.
  • Viewport width/height works easier for me than raw %.
  • For one-off situations, I like the good old meta refresh over fiddling with JavaScript.

–jeroen

Posted in CSS, Development, HTML, Web Development | Leave a Comment »

Life after Google+ – Lars Fosdal: Friends+Me Google+ Export tool.

Posted by jpluimers on 2019/01/11

A little while ago, I blogged about Life after Google+ – Lars Fosdal. In the mean time, Lars has made a lot of progress exporting the community [WayBack] Delphi Developers – Google+ (which has moved to en.delphipraxis.net !).

He is a heavy user of the Friends+Me Google+ Export tool, which basically is an actively maintained web scraper with standard output targets:

[WayBack] Google Plus Exporter – Medium: Export your Google+ feeds to WordPress, Blogger, and JSON.

It does not depend on the G+ REST API: “the app is using web scraping and will keep working until the bitter end”.

Quite a bit of that information and the feedback he has is in this thread: [WayBack1/WayBack2] Hi Everyone, We’ve just released Google+ Exporter, an application that helps you to export your Google+ feeds (profile, pages, collections, communities… – Friends+Me – Google+

Of course G+ does not save the whole thread in the WayBack machine, so here it is copy-pasted (unformatted; maybe I will format it later):

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Posted in Development, G+: GooglePlus, Gutenberg editor, LifeHacker, Power User, SocialMedia, Software Development, Web Development, WordPress, WordPress | Leave a Comment »

About Blocks – bl.ocks.org

Posted by jpluimers on 2018/12/20

[WayBack] About Blocks – bl.ocks.org is so cool:

Bl.ocks (pronounced “Blocks”) is a simple viewer for sharing code examples hosted on GitHub Gist.

…

The main source for your example is in index.html. This file can contain relative links to other files in your Gist, such as images, scripts or stylesheets. And of course you can use absolute links, such as CDN-hosted D3, jQuery or Leaflet. To explain your example, add a README.md written in Markdown. (You can omit the index.html if you just want to write, too.)

[WayBack] Code-only-Blocks are cool too:

When your Gist is missing an index.html file, will hide the example iframe but continue to display everything else.

Just compare these:

–jeroen

Posted in Development, DVCS - Distributed Version Control, gist, GitHub, jQuery, Scripting, Software Development, Source Code Management, Web Development | Leave a Comment »

UptimeRobot is written in PHP and runs on IIS

Posted by jpluimers on 2018/11/28

In [WayBack] Jeroen Pluimers‏ @jpluimers: Every now and then editing @uptimerobot entries failed. Just “HTTP Error 503.4 – Service Unavailable The FastCGI pool queue is full” 1/2 I found out that UptimeRobot:

There is also a maintenance page at uptimerobot.com/maintenance.php#tvMode [Archive.is] and uptimerobot.com/maintenance.php?c-e [Archive.is]. If you get to those, then retry in ~10 minutes as sometimes it takes that long for an update to be processed.

Sometimes setting up multiple Android devices for the same uptimerobot account can be a bit of a hassle: [WayBack] Uptime Robot on Twitter: “Once logged in to the account from another Andriod device, that device will be added as an alert contact too.… “.

All in all it is still a nice tool (:

–jeroen

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Posted in *nix, Development, IIS, Monitoring, PHP, Power User, Scripting, Software Development, Uptimerobot, Web Development | Leave a Comment »

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