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COS 125
DAY 20
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Agenda Assignment 5 corrected
3 A’s, 4 B’s, 1 D and 1 F’s 4 late turn-ins @ -20 points per day Time of submission is the later of the time when
assignment file is uploaded in blackboard or the last time the file on the web server is modified
Assignment 6 is posted Due April 15 @ 2PM (Next Class)
Left to do 2 Assignments (8 total)
One per week 1 Quiz Capstone projects
Lecture/Discuss Layout with Styles
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Tips for Assignment #6 For assignment #6 I gave you a xHTML page with
lots of text and various elements You cannot modify the xHTML page other than
associating with different style sheets You will have create several different style sheets
to format this page Style sheets will be IAW formatting rules I give you
You will have to produce a menu that shows the same pages formatted with each different style sheet
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Layout with Styles Allows for more possibilities than xHTML
layout Can create Liquid layouts that expand or
contract with browser window Separate layout from Content allowing you
to change layout without re-coding WebPage
Examples of everything in this lecture available at http://perleybrook.umfk.maine.edu/samples/StyleLayout.htm
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Structuring Your Pages Divide your page in logical sections using
the <div> element Name each division using the id attribute
id=“daName” Put the sections in order in your XHTML
page Use headers (h1, h2, h3 etc ) in a
consistent fashion
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The Box Model For CSS, every element is in an invisible
Box that has the following Content (middle) Padding (between Content & Border) Border (around element) Margin (Between element border and next
element) Boxes are either block level (new
paragraph) or inline (on same line) xHTML flow from top to bottom with line
breaks around block level elements
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Box Model (inline)
Margin
Border
Padding
Content
Margin
Border
Padding
Content
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Box Model (block)Margin
Border
Padding
Content
Margin
Border
Padding
Content
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Changing backgrounds Every element including the page itself can have its own background To set background color
selector{background-color:”blue” or “#336677” or rgb(200,100,34) or transparent}
To use a background image selector{background-image:url(image.gif)} If you use both color and image the color will be used until the image is loaded
and will be seen through any transparent parts of the image To repeat background image
background-repeat:repeat or repeat-x or repeat-y or no-repeat To fix background relative to element
background-attachment:fixed or scroll To specify position of background
background-position: x y To do all at once
background:url(image.gif) repeat-x fixed bottom left; Default setting
background:transparent none repeat scroll top left
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Changing the foreground color selector{color:colorname or #rrggbb or
rgb(r,g,b) or rgb(r%, g%, b%) Foreground doesn’t work on image (img)
element
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Setting the height and width of elements You can set the height and width as a
absolute values or relative to parent element
Selector{width:w;height:h} Setting width or height to auto allows the
browser to calculate Exampes
#banner{width:100%; height:auto} img{width:200px, height:auto} a:link{width:100px height:50px}
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Setting margins Margins are outside of the border Selector{margin:x}
X = size in px (10px) or relative (2em) or percentage (10%)
Can also set margin by side margin-top:x margin-left:x
If two elements with margins touch, the space between their borders is the larger of the two margins and not the sum of the two margins
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Adding padding From inside out of an element
Content, padding, border, margin Selector{padding:x}
X = size in px (10px) or relative (2em) or percentage (10%)
Can also set padding by side padding-top:x padding-left:x
Margin
Border
Padding
Content
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Setting the Border Every element can have a border Border-style: type
Type can be dotted, dashed, solid, double, groove, ridge, inset, or outset
Border-width: Npx If you give 4 values one value you can modify each side Border-width: 2px 3px 4px 5px Top = 2, right= 3, bottom = 4 , left = 5
Border-color: colorname or #rrggbb or rgb(r,g,b) or rgb(r%,g%,b%)
Can also just effect one side using border-top-style:
Shorthand border-side-property: value(s)
Border-top-color:blue; Border-right-style:groove;
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Controlling the flow (position) 4 ways to position an element box
Static – with the flow Absolute – in a fixed position relative to parent
element Fixed – in a fixed position relative to browser Relative – with respect to default position in
the flow If boxes overlap you can control which
goes over which using z-index
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Offsetting Elements in the Natural flow Every element as a “natural” location
based on page flow You can moved the an element relative to
its natural position Does not effect any other element in page
Selector{Postion:relative; top:v; left:v; bottom:v; left:v}
V is desired distance you want offset from natural location in absolute (12px) or relative values (1em, 1.5em) Can cause overlaps
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Positioning Elements Absolutely Elements in a xHTML web page flow in the order
they appear in the xHTML You can take them out of the flow and position
them wherever you want with respect to their parent Selector{postion:absolute; top:v or bottom:v; left:v or
right:v} Generally you use
top or bottom left or right
V is desired distance you want offset from parent in absolute (12px) or relative values (1em, 1.5em) or as a percentage of parent (10%)
Can cause overlaps Percentages create “liquid” layouts
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Fixing an Element in the Browser Windows Cause an element to fixed..doesn’t move
when the page is scrolled Works in IE7, FireFox and Opera
Selector{Postion:fixed; top:v; left:v; bottom:v; left:v}
V is desired distance you want offset from browser in specific (12px) or relative to parent values (1em, 1.5em) or as a percentage of browser (10%)
Can (and most likely will) cause overlaps
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Making elements float You can make elements “float” in a “sea”
of text This property has buggy results Selector{float:left or right)
Elements “float” in the direction selected If more than one element is floated in the
same direction they will stack in the order they appear in xHTML
Float left
Float right
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Controlling whether or not elements can floats next to another If you don’t want anything float to the left
right or both of a particular element Selector{clear:left or right or both}
Example #banner{clear:both} #blockhouse{clear:left}
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Positioning elements in 3D You can effect in which “layer” each
element appears Very important when you have overlap selector{z-index:n}
The highest n goes on top The lowest n goes to the bottom Think of n as the elevation of the element
Children will assume the z-index of parent first then will be in “Z” order versus their siblings
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Changing the cursor You can set how the cursor looks in each element
Browser and O/S dependant Selector{cursor:value}
Value can be Pointer default crosshair move wait help text x-resize
X can be n, s e or w or combinations
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Determining Overflow What happens when the content of an element is
larger than the “box” you have created for it?? Condition can be controlled via overflow property Selector{overflow:value}
Value can Hidden (what ever doen’t fit becomes invisible) Visible (makes the box fit the contents) Scroll (forces scroll bars) Auto (scroll bars only when necessary)
Problems with IE 6 works in IE7
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Aligning Elements Vertically Selector{vertical-align:value} Value can be
baseline -- bottom of element lines up with bottom of parent
middle -– middle of element lines up with middle of parent
sub – lines up below parent super –lines up above parent text-top – top of element aligns to top of parent text-bottom – align the bottom of element to bottom of
parent top –aligns top of element to top of tallest element in
the same line bottom- aligns bottom of element to bottom of lowest
element in the same line
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Displaying and Hiding Elements You can control how the browser display
an element using the property display: h1{display:”value”}
Values can be none hides the element block displays element as block level inline displays the element as inline list-item displays the element as though you
has used <li> tag (covered later)
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Cool CSS effects Rollover buttons
http://perleybrook.umfk.maine.edu/classes/cos125/HTML6ed_examples/css-effects/rolloverbuttons.html
image “pop-ups” http://perleybrook.umfk.maine.edu/classes/cos125/HTML6ed_e
xamples/css-effects/popups.html
Drop down menus http://perleybrook.umfk.maine.edu/classes/cos125/HTML6ed_e
xamples/css-effects/dropdownmenus-noformat.html
http://perleybrook.umfk.maine.edu/classes/cos125/HTML6ed_examples/css-effects/dropdownmenus.html
Replacing headers with Images (not for IE) http://perleybrook.umfk.maine.edu/classes/cos125/HTML6ed_e
xamples/css-effects/imagereplacement.html
More effects http://www.dynamicdrive.com/style/
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Learning Objectives Use Media-specific style sheets Understand the difference between
screen and print styles Specify when pages will break in a style
sheet for printing Identify print-specific properties using the
@page rule.
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Media-Specific Style Sheets You can designate a stylesheets to be used only for
printing, for screen display or for both. Use attribute “media=“print” or “screen” or “all” in the
open link or style tag You can also import using
@import “print.css” print; Example
<link rel=”stylesheet” media=“print” type=“text/css” href=“print.css”>
<link rel=”stylesheet” media=“screen” type=“text/css” href=“screen.css”>
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How Print Style Sheets Differ Can be the same or very different from screen
version Some suggestions
Use points instead of pixels for sizing 12points instead of 15px
Hide sections like sidebars, banners or ads display:none
Remove background colors and images Adjust margins Set page breaks Let viewers know that printouts are different than
viewed pages Test the print out (print preview) and adjust if
necessary
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Controlling Page Breaks WebPages can be very long Use CSS to control where the contents are printed relative
to printer page Where page breaks occur
Page-break-before:values Page-break-after:values Page-break-inside:values Values are “auto” “always” or “avoid”
Examples p{page-break-inside:avoid} h1,h2,h3{page-break-before:always}
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Other print Specific CSS properties These do not work in IE or Netscape (yet!) You can predefine printing pages
@page :left or :right or :first “name”{ stuff } Stuff can be
Size:w h w=width of page h=height of page Margin:x Marks:kind Any other property:value pairs
Example @print :first{size 8.5in 11in; margin:1in marks:none} @print legal{size 8.5in 14in; margin 1in 0.5in 1in 0.5in}
Use predefined rule Selector{page:legal;}
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Widows and Orphans Orphan is a term used to describe a single word appearing
at the bottom of a paragraph or column. A widow is a single word or short phrase appearing alone
at the top of column. To modify using css
Selector{orphans:n} Selector{widows:n} N is minimum number of lines to appear at the top (widow) or
bottom (orphan) of a page p{orphans:4;widows:4}