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Frontend 101
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Sebastiaan Deckers
April 15, 2013
Programming
4
550
Frontend 101
Sebastiaan Deckers
April 15, 2013
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Transcript
101 Web Standards URL, HTTP, HTML, CSS, JavaScript
URL uniform resource locator Purpose: Make data addressable
http://www.google.com /search?q=flowers#foot
http:// protocol scheme http, https, file, mailto, ...
http:// root double slash
bob:s3cr3t@www. example.com:8080
bob:s3cr3t@www. example.com:8080 domain required
bob:s3cr3t@www. example.com:8080 port optional default is 80 range: 1-65,535
bob:s3cr3t@www. example.com:8080 authentication credentials optional rarely used, legacy not how
modern web apps handle logins
reddit.com/r/IAmA/top path convention to omit “index.html” slashes “/” denote hierarchy
leading slash is the root directory reference current level with single dot “.” can be relative by using double dot “..”
Current page: reddit.com/r/IAmA/top Link: ./new Result: reddit.com/r/IAmA/new
Current page: reddit.com/r/IAmA/top Link: new Result: reddit.com/r/IAmA/new
Current page: reddit.com/r/IAmA/top Link: ../pics/new Result: reddit.com/r/pics/new
Current page: reddit.com/r/IAmA/top Link: / Result: reddit.com/
http://www.google.com /search?q=flowers#foot query string after the question mark “?” key=value
pairs used to pass information to the web server
http://www.google.com /search?q=flowers#foot fragment identifier after the hash sign points to
specific content in the page
HTTP hyper-text transfer protocol Purpose: Transfer content from a web
server to a web browser
Demo https://gist.github.com/cbas/5378704 Syntax request/response method, URI, version headers body
hyper-text markup language Purpose: Structures content of the document semantically
User agent: Browsers, crawlers, screen scrapers, file converters HTML
Demo https://gist.github.com/cbas/5379047 Syntax doctype elements attributes text comments
doctype describes HTML version the document uses HTML5 simplified it
to “<!DOCTYPE html>”
elements opening and closing tags: <p>some text</p> self closing tags:
<img /> equals <img>
must wrap values in double or single quotes if they
contains spaces, so just always do it <img src='house.jpg' alt="Seb's House"> attributes
attributes white space separated <img src="logo.png" alt="My Logo">
attributes names case insensitive, but lowercase looks better <img SRC="logo.png">
equals <img src="logo.png">
text escape special characters < “<” or > “>” &
or “&” white space collapses into single space “Hi there!” becomes “Hi there!”
comments begin with “<!--” and end with “-->” useful to
hide a section, or describe it to other developers (ie. future self) contains any HTML except comments
CSS cascading style sheets Purpose: Presentation of the data, typically
through visual layout and design Targets: Screen, print, or assistive technology (eg. screen readers)
Demo https://gist.github.com/cbas/5379150 Syntax selectors blocks properties values
selectors universal selector asterisk “*”
selectors type element name
selectors class space separated list re-usable on any elements
selectors id single value unique in the page
selectors attributes element has attribute “img[title]” attribute value equals “input[type=’password’]”
selectors pseudo classes :first-child, :last-child, :nth-child() :hover, :active, :focus :visited
:not()
selectors pseudo elements ::first-line, ::first-letter ::before, ::after
selectors combinators child of “>” preceded by “~“ immediately preceded
by “+”
blocks wrapped in curly braces “{ }”
blocks required: one block per selector h1 { } optional:
multiple selectors per block h1, h2, h3, h4, h5, h6 { }
properties examples: font-family, color, background, padding, ... vendor prefixes -webkit-*,
-moz-*, -ms-*, -o-*
values amount + unit
amount integer 5, number 4.5
units percentage 5%, length 5px, time 5ms, colour #5030bf, string
"Arial", url url(me.jpg), angle 90deg, ...
JavaScript Purpose: Interactive behaviour on a web page Examples: Popup
dialogs, visual effects, in- place data loading, ...
JavaScript is a programming language outside the scope of this
course. We can however use code snippets to achieve many useful behaviours.
Demo https://gist.github.com/cbas/5379212 Syntax Embedded: <script>... source code ...</script> Linked: <script
src=”... link to code file...”></script>