Limiti di WordPress.com

under costruction

Per chi non volesse installare e configurare un webserver e poi aggiungerci wordpress, e non avesse le disponibilità di acquistare spazio hosting che fornisca l’estensione a questo famoso CMS, si può optare per una soluzione gratuita, ma comunque molto valida, aprire un account gratutito (volendo un domani upgradable a pagamento con molte funzioni aggiuntive) su wordpress.com [scelta che il gruppo ha sposato con 4 siti hcklug, hckretro, papidream e nino360]. Bisogna, però, ricordare che questa ultima soluzione ha delle restrizioni, che in certi contesti o per certe esigenze possono risultare limitanti. Con un po’ di fantasia e di programmazione in HTML e CSS, comunque si riescono ad ottenere risultati apprezzabili senza che i vincoli imposti dal provider pesino troppo sull’aspetto finale.

wordpress.com: Ottimo hosting di siti, però con alcuni limiti, dettati da ragioni di sicurezza (con i quali spesso concordo in pieno), che se noti, stimolano lo sviluppatore a seguire strade non convenzionali, ma altrettanto valide per ottenere comunque il risultato voluto…

WordPress.com Benefits

  • It’s free and super easy to set up
  • All of the technical maintenance work is taken care of — Setup, upgrades, spam, backups, security, etc.
  • Your blog is on hundreds of servers, so it’ll always remain available, even under high traffic
  • Your content is backed up automatically
  • You’ll get extra traffic from being a part of the WordPress.com community
  • You can find like-minded bloggers using search and the reader
  • Your dashboard is secure (SSL) making it even safer to log in on shared networks

WordPress.com Cons

  • We provide 200+ themes (and adding more every day) which you can customize, but you cannot upload a custom theme
  • You can’t modify the PHP code behind your blog
  • You can’t upload plugins

WordPress.com is different. You don’t have to download software, pay for hosting, or manage a web server to use WordPress.com. Instead, you can focus on creating awesome content!

When you sign up for a WordPress.com blog, you’ll get a URL like andy.wordpress.com, or you can map a domain like myblog.com.

You don’t control the software or the database, so FTP and shell access are not included. For security and performance reasons, custom themes or plugins can’t be uploaded to WordPress.com.

50MB upload limit

WordPress.com limits the space available for uploads to 50MB. They would really like it if you just paid for an “upgrade” to access more drive space – it’s not expensive, but there are other options.

  • pay WordPress.com $20US per year to get 1GB of upload space
  • use separate file upload services, including (but not limited to):
    • DivShare.com (all file types)
    • OurMedia.org (all media file types)
    • Flickr.com (free or subscription-based – photos and images only)
    • YouTube.com (free, video only, up to 10 minutes in length)
    • Google Video (free, video only, any length)

No Custom CSS

You aren’t able to modify the CSS to change things like fonts, colours, or images used by the theme. This is generally not an issue, but if that level of customizability becomes necessary, a WordPress.com upgrade is available which allows custom CSS for $15US per year.


Limited filetypes allowed for uploading

For security reasons, WordPress.com only allows uploading of files using the following extensions (and there is no workaround, except for using an alternate file hosting service for those files).

  • .jpg
  • .jpeg
  • .png
  • .gif
  • .pdf
  • .doc
  • .ppt

Limited media embedding

WordPress.com will remove the object and embed HTML elements from content, meaning you can’t just paste a media service’s “embed this” code to place a video or other piece of media within a page or blog post on WordPress.com. Both YouTube and Google Video are supported via a custom embed format, as well as some other services via VodPod.


nel dettaglio le limitazioni sono le seguenti:

Audio e Video: non è possibile integrare, per ragioni di sicurezza, filmati ed animazioni Flash, questo comprende anche youtube, file mp3, file flv…

HTML: non è possibile impostare liberamente dimensioni, caratteri, colori ed immagini del BODY, alternativamente si possono gestire i Tag

,, ,

per ottenere comunque soluzioni accettabili

I comandi HTML utilizzabili sono:

Per i CSS a parte alcune piccole differenze di sintassi, quasi tutti i comandi sono disponibili.

No Custom Themes

Users are not allowed to edit their themes, nor may they add a new custom theme to the service. There is no workaround, while using the WordPress.com service.


No Custom Modules

See above. No workaround.


Portability

Even if you get started using WordPress.com and outgrow its limitations, it’s not the end of the world. Your website is completely portable! WordPress offers an export/import function, meaning you can pack up your stuff, move to your own server, and import it there. There’s no lock-in, aside from the URL used to access the site.

Non si possono installare plugin

Meta che possono essere inseriti nelle pagine

address, a, abbr, acronym, area, article, aside, b, big, blockquote, br, caption, cite, class, code, col, del, details, dd, div, dl, dt, em, figure, figcaption, footer, font, h1, h2, h3, h4, h5, h6, header, hgroup, hr, i, img, ins, kbd, li, map, ol, p, pre, q, s, section, small, span, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, var

If you are familiar with HTML, you’ll notice that codes such as embed, frame, iframe, form, input, object, textarea and others are missing from the above list. Those codes are not allowed on WordPress.com for security reasons.

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JavaScript

Users are not allowed to post JavaScript on WordPress.com blogs. JavaScript can be used for malicious purposes. As an example, JavaScript has taken sites such as MySpace.com and LiveJournal offline in the past. The security of all WordPress.com blogs is a top priority for us, and until we can guarantee scripting languages will not be harmful, they will not be permitted.

JavaScript from trusted partners, such as YouTube and Google Video, is converted into a WordPress shortcode when a post is saved.

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Flash and Other Embeds

Flash and all other embeds are not allowed in WordPress.com posts, pages, or text widgets. For security reasons, we remove the tags needed for these to work. Your intentions may be innocent, but someone somewhere might try to use such embeds to damage the site, affecting all of our users.

There are several safe ways to post Videos, Audio, and other items to your WordPress.com blog.

E’ anche possibile inserire del codice da visualizzare secondo delle direttive specifiche

While WordPress.com doesn’t allow you to use potentially dangerous code on your blog, there is a way to post source code for viewing. We have created a shortcode you can wrap around source code that preserves its formatting and even provides syntax highlighting for certain languages,

Gallery Shortcode

LanguagesEnglish • 日本語 • Português do Brasil • (Add your language)

In WordPress 2.5, the Gallery feature allows the option to add an image gallery to a Post or Page on your WordPress blog.

The  shortcode is used in a Post or Page to display a thumbnail gallery of images attached to that post. It can be used in its simplest form like this:


There are several options that may be specified using this syntax:


You can also print a gallery directly in a template like so:

 <?php echo do_shortcode(''); ?>

This works too:

 <?php
    $gallery_shortcode = '
';
    print apply_filters( 'the_content', $gallery_shortcode );
 ?>

Options

The following basic options are supported:

orderby 
specify how to sort the display thumbnails. The default is “menu_order”. Options:
  • menu_order – you can reorder the images in the Gallery tab of the Add Media pop-up
  • title – order by the title of the image in Media
  • post_date – sort by date/time
  • rand – order randomly
  • ID
order 
specify the sort order used to display thumbnails. ASC or DESC. For example, to sort by ID, DESC:
 
columns 
specify the number of columns. The gallery will include a break tag at the end of each row, and calculate the column width as appropriate. The default value is 3. If columns is set to 0, no row breaks will be included. For example, to display a 4 column gallery:

id 
specify the post ID. The gallery will display images which are attached to that post. The default behavior if no ID is specified is to display images attached to the current post. For example, to display images attached to post 123:

size 
specify the image size to use for the thumbnail display. Valid values include “thumbnail”, “medium”, “large”, “full” and any other additional image size that was registered with add_image_size(). The default value is “thumbnail”. The size of the images for “thumbnail”, “medium” and “large” can be configured in WordPress admin panel under Settings > Media. For example, to display a gallery of medium sized images:

Some advanced options are available:

itemtag 
the name of the XHTML tag used to enclose each item in the gallery. The default is “dl”.
icontag 
the name of the XHTML tag used to enclose each thumbnail icon in the gallery. The default is “dt”.
captiontag
the name of the XHTML tag used to enclose each caption. The default is “dd”. For example, to change the gallery markup to use div, span and p tags:

link
you can set it to “file” so each image will link to the image file. The default value links to the attachment’s permalink.

include
comma separated attachment IDs to show only the images from these attachments.

exclude
comma separated attachment IDs excludes the images from these attachments. Please note that include and exclude cannot be used together.

 

 

 

fonti:

http://en.support.wordpress.com/plugins/
http://en.support.wordpress.com/com-vs-org/
http://opencontentdiy.wordpress.com/documentation/limitations-with-wordpresscom/
http://en.support.wordpress.com/code/
http://en.support.wordpress.com/code/posting-source-code/
http://codex.wordpress.org/Gallery_Shortcode

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