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Dynamic HTML

Dynamic HTML. Part 1: Cascading Style Sheets. DHTML. DYNAMIC HTML Like HTML, many browser specific variations. CSS JavaScript Accessing/Manipulating the HTML document information through methods such as JavaScript. Generally, other browser multimedia technologies. CSS.

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Dynamic HTML

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  1. Dynamic HTML Part 1: Cascading Style Sheets

  2. DHTML • DYNAMIC HTML • Like HTML, many browser specific variations. • CSS • JavaScript • Accessing/Manipulating the HTML document information through methods such as JavaScript. • Generally, other browser multimedia technologies.

  3. CSS • Style Sheets are generally referred to as “Cascading”. This means that Style information may come from several sources and information from one source may override information from another. • CSS browser compatibility is very poor. • HTML was never intended to have graphic information, such as colors. This was intended to be provided to the browser via CSS.

  4. Uses of Style Sheets • To give the site a uniform look and feel. • To change style information at one source. • To layer elements. • To position elements. • To make textual link rollovers. • To add Boxes and Borders.

  5. Example of Style Information H1 {color:blue} Three parts of a CSS Element • H1 is the selector • Color is the property • Blue is the value

  6. By the way…. • This has parallels in HTML: <font color=“blue”> 3 Parts of an HTML Element Font is the Tag Color is the attribute Blue is the value

  7. Back to our Story… In addition to three parts of a CSS Element, CSS is usually introduced into a page in one or more of three ways: • Linked • Embedded • Inline • Style sheets may also be @import-ed

  8. Method 1Linked Style Sheets • The style sheet needs merely have the STYLE INFORMATION ALONE. • DOES NOT NEED HTML TAGS • File name example: Mystylesheet.css

  9. Three Attributes of a <Link> Tag • <link type=“text/css” href=“css/mystyle.css” rel=“stylesheet”>

  10. Method 2Embedded Style Sheets • In the <head> section <style type=“text/css”> body {backgound-image: “bg.gif”} h1 {font-family: arial, helvetica} </style>

  11. Only One Problem… • The style info would show up in older browsers. Therefore we hide them in a comment: <style type=“text/css”> <!-- body {backgound-image: “bg.gif”} h1 {font-family: arial, helvetica} --> </style>

  12. Method 3Inline Style • Style information may be put in nearly any HTML tag. • Several tags, such as DIV, SPAN, INS, and DEL, were designed specifically for use with CSS. <div style=“font-family: “times new roman”, serif”>

  13. <Div> and <Span> • Div is used to specify style for a division of your page. • Span is used to interrupt the current style information, for instance if you wanted to add a section of specially formatted text. • Ins and del are used to indicate inserted or deleted text. Example: legislative changes.

  14. CSS Has Class! In the head section… <style type=“text/css”> body {backgound-image: “bg.gif”} .blue {color: #0000ff} h1.blue {font-family: arial, helvetica; color: #0033ff} </style>

  15. …And in the HTML • <p class = “blue”> • or <h1 class =“blue”> • With no dot

  16. Show me your ID! <style type=“text/css”> body {backgound-image: “bg.gif”} #crazy {font-style: jester, scribble, script} h1#MySpecial {font-family: arial, helvetica} </style>

  17. Class or ID • Generally use class. • Each ID can only be used once per page.

  18. Explorer Text Hovers a:link {color: green} a:active {color: silver; font-weight: bold} a:visited {color: purple} a:hover {color: red}

  19. Measurements • There are numerous measurements: • Percent: p {line-height:200%} • Points: h1 {font-size: 24pt} • Pixels: <span style=“font-size: 30px”> • Several others.

  20. Learning Style Sheets • Remember there are three parts to a CSS element: selector, property, and value. • There are three main methods of using style information: linked, embedded, or inline. • There are THRee attributes in the link tag: t - type, h-href, and r-rel.

  21. Conclusion • Aim for simple sheets that work in both browsers. • Almost everything you need to know about style sheets beyond this presentation is simply properties and values. • Keep a reference handy • Start Small

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