html and css advanced
Post on 23-Feb-2016
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HTML AND CSS ADVANCED
Neal Stublennstublen@jccc.edu
Course Road Map Create web page layouts using CSS Manage CSS Test website validity Create navigation menus using CSS Incorporate meta content and
multimedia
CHAPTER 5:INCORPORATING
META-CONTENT AND MULTIMEDIA
Refresh and redirect pages Link media to a web page Embed media in a web page
What’s Ahead?
Refresh to Update Content If your site’s content may change…
Stock prices, sports scores, traffic information
You can try to reload the page every 30 seconds…
<meta http-equiv=“refresh” content=“30” />
Redirect to New Content If your site’s content has moved…
Site redesign, newer information
You can redirect to another page…
<meta http-equiv=“refresh” content=“5;url=http://site.com/page.html” />
Any Gotchas? What should you consider when
refreshing and redirecting pages?
Some Gotchas! Browsers may allow the user to disable
refreshes and redirects that are specified in meta tagsRedirects should include a message to
indicate what’s happening along with a link to the new page
You may refresh the page and interrupt the user (this could be annoying)
Practice Activity Refresh a page, Activity 1
Specify a page refresh (p.118) Redirect a page, Activity 2
Specify a page redirect (p.120)
Refresh Alternative Use JavaScript and AJAX to update only
portions of the page that may have changedFaster, less obtrusiveConsider Gmail when you delete a message(Evening class scheduled for October)
Refresh and redirect pages Link media to a web page Embed media in a web page
What’s Ahead?
Practice Activity Refresh a page, Activity 3
Specify a page refresh (p.124)
Refresh and redirect pages Link media to a web page Embed media in a web page
What’s Ahead?
Alternative to Linking Embedding media in a web page allows
the user to play the media without leaving the pageYouTubeAdobe Flash
Object Elements <object> elements can be used to
embed media files on a page Media playback occurs within the
browser The attributes of the <object> element
help the browser locate the media content
<param> elements also help control media playback
<object> Example<object standby=“Loading audio…” type=“application/x-mplayer2” data=“media/coffee.mp3” width=“320” height=“45”><param name=“src” value=“media/coffee.mp3” /><param name=“autostart” value=“true” /></object>
MIME Types The type attribute identifies the media
type for the embedded content It helps the browser locate the
appropriate plug-in for playback Not always necessary; it will depend on
the media and the browser
Sample MIME Typesaudio/x-ms-wma (Windows Media)audio/x-wav (WAV audio files)audio/mpeg (MP3 audio files)video/x-ms-wmv (Windows Media)video/quicktime (Quicktime Media)application/x-shockwave-flash (Flash)application/x-mplayer2 (Windows Media)
Practice Activity Activity 5-4 (p.131)
Embedding a WMV file Activity 5-5 (p.134)
Embedding an MP3 file Activity 5-6 (p.137)
Embedding an MOV file Activity 5-67 (p.144)
Embedding an SWF file
Practice Activity Most importantly…YouTube
We’ll go back and modify Activity 5-4 to embed a YouTube video instead of a WMV file.
HTML5 Media Additions The newest version of the HTML
specification includes <audio> and <video> elements for embedding media
These would be preferable to using <object> elements
(Evening classes scheduled for June and September)
Refresh and redirect pages Link media to a web page Embed media in a web page
What’s Behind?
BONUS CONTENT:TRACKING SITE CHANGES
Oops! That’s Bad… Your site is published online You want to make changes What if you mess up and need to start
over? What if you can’t get back to where you
started?
A Simple Solution Archive the folder for the current version
of your sitesite_folder site_folder.v01
Begin making changes to a copy of that original version
Compare Versions Tools allow you to compare one folder’s
content with another folder’s contentMicrosoft Code Compare (free)Beyond Compare (not free)Araxis Merge (even less free, but supports
OSX) I’m certain there are others; these are
just the ones I’ve used.
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