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SEG3210

SEG3210. DHTML Tutorial. DHTML. DHTML is a combination of technologies used to create dynamic and interactive Web sites. HTML - For creating text and image links and other page elements.

kenneth-garza
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SEG3210

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  1. SEG3210 DHTML Tutorial

  2. DHTML • DHTML is a combination of technologies used to create dynamic and interactive Web sites. • HTML - For creating text and image links and other page elements. • CSS - Style Sheets for further formatting of text and html plus other added features such as positioning and layering content. • JavaScript - The programming language that allows you to accesses and dynamically control the individual properties of both HTML and Style Sheets

  3. Why DHTML • With DHTML you can create: • Animation • Pop-up menus • Inclusion of Web page content from external data sources • Elements that can be dragged and dropped within the Web page

  4. HTML

  5. HTML (Hyper Text Markup Language) • An HTML file is a text file containing small markup tags • The markup tags tell the Web browser how to display the page • An HTML file must have an htm or html file extension • An HTML file can be created using a simple text editor

  6. HTML (cont.) <html> <head> <title>SEG3210-Lab1</title> </head> <body> This is Our First Test. <I>This text is Italic</I> </body> </html> • Most tags have opening and closing tags:<html> </html>, <head> </head> • Only some don’t have it: <br>, <hr>, <img> gives technical information about the document, and specifies its title. Nothing that appears in the header section will be displayed by the browser.

  7. HTML

  8. HTML • Some tags have attribute such as:<body bgcolor = “green"> • Attributes always come in name/value pairs like this: name="value". • Click here to see most of HTML Tags and their attributes • Special treatment for some characters &nbsp, &quot

  9. HTML <html> <head> <title>SEG3120 Lab1</title> </head> <body bgcolor =Red> <p align =center> <B> User Interface Design </B></p> <hr> <p>[1] Course Notes<br> <a href="http://www.site.uottawa.ca/%7Eelsaddik/abedweb/teaching/seg3120.html"> SEG3210</a> </p> </body> </html>

  10. HTML

  11. Try it <body> <p>Student Marks<br> </p> <table width="100%" border="2"> <tr bgcolor="green"> <td>Student Number</td> <td>Student First Name </td> <td>Mark</td> </tr> <tr> <td>10</td> <td>Adem</td> <td>A+</td> </tr> <tr> <td>20</td> <td>Jack</td> <td>C+</td> </tr> </table> </body>

  12. HTML

  13. CSS

  14. CSS • CSS stands for Cascading Style Sheets • Styles define how to display HTML elements • Styles are normally stored in Style Sheets

  15. CSS • External Style Sheets can save you a lot of work • External Style Sheets are stored in CSS files • Multiple style definitions will cascade into one • Why? Modularity  simplicity, usability, reusability, etc

  16. CSS • Syntax • selector {property: value} • The selector is normally the HTML element/tag • the property is the attribute you wish to change, • and each property can take a value. • Three Method to specify • Tag Modfier • body {color: black} • p { text-align: center; color: black; font-family: arial }

  17. CSS • Three Method to specify • Class Modifier • With the class selector you can define different styles for the same type of HTML element .center {text-align: center} <h1 class="center"> This heading will be center-aligned </h1> • The id Selector • With the id selector you can define the same style for different HTML elements • #green {color: green} <h1 id="green">Hello </h1> <p id="green">Some text</p>

  18. CSS (cont.) • How to Insert a Style Sheet • Internal style • An internal style sheet should be used when a single document has a unique style. • You define internal styles in the head section by using the <style> • Inline Styles: Many of the Advantages are lost

  19. CSS Example <Html> <head> <style type="text/css"> hr {color: green} p {margin-left: 20px} body {background-color:yellow} </style> </head> <body> <h1 style ="color =blue; text-align=center"> SEG3210 </h1> <hr> <p>DHTML tutorial</p> </body> </Html> Tag Modifier Inline

  20. CSS Example

  21. CSS (cont.) • How to Insert a Style Sheet • External Style Sheet ideal when the style is applied to many pages <head> <link rel="stylesheet" type="text/css“ href="mystyle.css" /> </head> .css text file

  22. CSS example

  23. CSS • Click for more details: CSS Tutorial.

  24. Java Script

  25. JavaScript Introduction • JavaScript was designed to add interactivity to HTML pages • JavaScript is a scripting language (a scripting language is a lightweight programming language) • JavaScript embedded in a web browser connects through interfaces called Document Object Models (DOMs) to applications server-side and client-side. This allows interactivity and dynamicity.

  26. JavaScript Introduction • A JavaScript is usually embedded directly into HTML pages • JavaScript is an interpreted language (means that scripts execute without preliminary compilation)

  27. How to Put a JavaScript Into an HTML Page • Scripts in the body section: • Scripts to be executed when the page loads go in the body section.. <html> <body> <script type="text/javascript"> document.write("Hello World!") </script> </body> </html>

  28. Java Script • Scripts in the head section: • Scripts to be executed when they are called, or when an event is triggered, go in the head section. <html> <head> <script type="text/javascript"> …….. </script> </head> </html>

  29. Java Script • External JavaScript • Save the external JavaScript file with a .js file extension <script src="xxx.js"> </script> • Deals with web elements using Java command, • If statement • Variables • Loops • …….

  30. JavaScript Examples <Html> <body> <script type="text/javascript"> var d=new Date() var timeh=d.getHours() var timem=d.getMinutes() document.bgColor=“red” document.write("the time is: ") document.write(timeh) document.write(":") document.write(timem) if (timeh>=12) document.write(" PM") else document.write(" AM") </script> </body>

  31. JavaScript – function <html> <head> <script type="text/javascript"> function message() { alert("Welcome guest!") } </script> </head> <body> <input type="button" value="View message" onclick="message()" /> </body> </html>

  32. Java Script and DOM <html> <body> <h1 id="header">My header</h1> <script type="text/javascript"> document.getElementById('header').style.color="red" </script> <p><b>Note:</b> It is the script that changes the style of the element!</p> </body> </html>

  33. More About DOM http://www.w3schools.com/htmldom/default.asp

  34. Example Try it <html> <head> <script type="text/javascript"> function hide() { document.getElementById('txt1').style.visibility ='hidden' } function show() { document.getElementById('txt1').style.visibility = 'visible' } function format() { document.getElementById('txt1').style.color = 'red' document.getElementById('txt1').style.fontSize = '20' document.getElementById('txt1').style.textAlign ="center" document.bgColor='green' }

  35. Example (Cont) function reset() { document.getElementById('txt1').style.color = 'black' document.getElementById('txt1').style.fontSize = '14' document.getElementById('txt1').style.visibility = 'visible' document.bgColor='white' document.getElementById('txt1').style.textAlign ="left" } </script </head> <body> <input type="text" id= "txt1"> <input type="button" value="Hide" onclick="hide()"> <input type="button" value="show" onclick="show()"> <input type="button" value="format" onclick="format()"> <input type="button" value="Reset" onclick="reset()"> </body> </html>

  36. Questions Next: go through all the examples and try them

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