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chp02_final - Mastering the Internet XHTML and JavaScript...

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Unformatted text preview: Mastering the Internet, XHTML, and JavaScript Chapter 2 Web Browsers Outline Goals and Objectives Chapter Headlines Introduction Finding a web page Browser Tasks The two browsers Browser window structure Internet Explorer Netscape Communicator Opera Crazy Browser Managing web pages Browser Cache Plug-ins Bookmarks History list Customization Security Wireless browsing Summary 2 Chapter 2 - Web Browsers Goals and Objectives Goals Understand and master the use of web browsers, to make surfing the web a more pleasant and productive experience Objectives Browser Tasks Browser Window Structure Microsoft Internet Explorer Netscape Communicator Opera and Crazy Browser Managing browsers: cache, plug-ins, and customization Managing surfing: bookmarks, privacy, and security Browsers for hand-helds Chapter 2 - Web Browsers 3 Chapter Headlines 2.1 Introduction You need a web browser to view web pages 2.2 Finding a web page The browser uses the URL of the web page to locate its web server computer 2.3 Browser Tasks Common browser tasks are viewing, navigation, downloading files, and printing 2.4 The Two Browsers Internet Explorer is widely used and Netscape is second 2.5 Browser Window Structure All browsers have title bar, menu bar, toolbars and status bar 2.6 Internet Explorer Fast and versatile browser but has no tabs, filters, or skins Chapter 2 - Web Browsers 4 Chapter Headlines 2.7 Netscape Communicator Comes in two versions: 4.8 and 7.01 2.8 Opera Claims to be the fastest browser on earth and has skins too 2.9 Crazy Browser Imitates IE, but is a tabbed browser, and has popup filters and killers 2.10 Managing Web Pages in a Browser Each page has URL, XHTML file, and content display 2.11 Browser Cache It speeds up downloading of web pages 2.12 Plug-ins It enables rendering of many different file types Chapter 2 - Web Browsers 5 Chapter Headlines 2.13 Bookmarks It enables rendering of many different file types 2.14 History List Use browser history list to trace your past navigation experience 2.15 Customization Change browser colors, fonts, and other settings to suit your use and style 2.16 Security HTTPS, digital keys, and certificates protect data on internet 2.17 Wireless Browsing Ability to Sync handhelds for mobility Chapter 2 - Web Browsers 6 Introduction A web browser is a computer program that displays web page content The user can specify the requested web page, by typing or clicking on a link, in a browser Browser can, then, locate and retrieve relevant web pages from servers Browser window is like the window of any other computer application Chapter 2 - Web Browsers 7 1. Type the page URL Finding a Web-page 2. Browser sends URL to DNS server which replies with IP address of requested server 3. TCP/IP packets go to the server through routers 4. Web server, upon receiving the packets, locates the file and sends it to your browser through routers Chapter 2 - Web Browsers 8 Browser Tasks The following are important browser tasks: Viewing Navigating Downloading Printing E-mail tools Chapter 2 - Web Browsers 9 Internet Explorer (IE) and Netscape Communicator (NC) are two important browsers To download IE go to http://www.microsoft.com To download NC go to http://www.netscape.com Two Browsers Chapter 2 - Web Browsers 10 Browser Window Structure A browser window has several bars on top of the window and one on the bottom of the window Title bar : displays the title of current web page Menu bar : contains the pull down menus Navigation bar : to navigate through web-pages Address bar : to type URL addresses Status bar : displays messages about the progress of current tasks Display area : displays the web page content Chapter 2 - Web Browsers 11 Browser Window Structure Chapter 2 - Web Browsers 12 Menus: File Edit View Favorites Tools Help Internet Explorer Toolbars: Standard buttons Address bar (URL) Links toolbar Status bar Chapter 2 - Web Browsers 13 Netscape Communicator Modules: Navigator Inbox Newsgroups Composer Address book Instant messenger Menus: File Edit View Go Communicator Help Toolbars: Navigation toolbar Address bar (URL) Personal toolbar Status bar Chapter 2 - Web Browsers 14 Netscape Communicator Chapter 2 - Web Browsers 15 Netscape Communicator Chapter 2 - Web Browsers 16 Can be downloaded at http://www.opera.com When it crashes it starts where it left off Menus: File Edit View Navigation Bookmarks Mail Window Help Toolbars: Main bar Navigation bar Address bar Personal toolbar Page bar Status bar Opera Chapter 2 - Web Browsers 17 Opera Chapter 2 - Web Browsers 18 Menus: File Edit View Favorites History Groups Options Tools Tabs Toolbars: Help Navigation bar Address bar Links bar Status bar Chapter 2 - Web Browsers Crazy Browser 19 Managing web pages Managing web pages deals with three aspects: URL XHTML file Display in browser A user can save a web page URL by making it a favorite in IE or a bookmark in NC A user can print the web page he is viewing by using the Print button A user can save the web page by using Save As... option from the File menu Chapter 2 - Web Browsers 20 A browser cache speeds up the retrieval and display of web pages that are being re-visited during a session Browsers use two types of caching schemes Browser Cache Memory cache Disk cache Memory cache saves web pages during its current session Disk cache saves web pages from its previous session When a page is requested, the browser first checks its memory cache and then disk cache. Browser also checks for updates Chapter 2 - Web Browsers 21 Plug-ins Plug-ins are programs that run within the browser Plug-ins appear to be a part of the browser even though they are separate programs The browser informs the user whenever a plug-in is needed for a web page They are easy to install Examples include: Adobe Acrobat Reader : to view .pdf files Macromedia Shockwave : plays animation and sound Macromedia Flash : to view animations Apple Quicktime : plays text, animations, video, and sound Chapter 2 - Web Browsers 22 Bookmarks A bookmark is a saved link to a web page User can name the bookmarked links E.g. my bank account, my home page Bookmarks in one browser/machine cannot be visible in another browser/machine Bookmark managing task include: Adding Deleting Organizing IE refers to bookmarks as Favorites Chapter 2 - Web Browsers 23 History List History allows users to retrace their surfing steps History can be: Short term Long term Short tem history is related to Memory cache Long term history is related to Disk cache CRTL + H keyboard shortcut usually displays browser history list Some browsers also have separate History button Chapter 2 - Web Browsers 24 Customization Browsers are customizable by users to fit their specification and style The user can customize: Default options Default web page Fonts Colors Toolbars Display of images Java and Javascript Style sheets Cookies options Configure mail and news groups server Change the size of cache Chapter 2 - Web Browsers 25 Security Security is important to prevent unauthorized access to the information passed between clients and servers Security over the internet is ensured by using encryption and decryption techniques Encryption and decryption technology is implemented by using Secure Sockets Layer (SSL) developed by Netscape SSL is a communication protocol and uses the HTTPS protocol Encryption systems incorporate: Public and Private Key Digital Certificate Chapter 2 - Web Browsers 26 Wireless browsing is the browsing activity on miniature screens of small electronic devices Some examples of devices where wireless browsing is incorporated are: Pocket PCs Hand-held PCs Cell phones PDAs Wireless browsing can be online or offline Offline wireless browsing is called sync for short, in which web pages are downloaded on the device for viewing them later Wireless browsing is different for reason such as screen size and disk space and have special browsers Chapter 2 - Web Browsers 27 Wireless Browsing Wireless Browsing Chapter 2 - Web Browsers 28 Summary A web browser provides access to a web page Browsers enable internet users to perform useful tasks Internet Explorer and Netscape Communicator are two major browsers A browser window has a generic structure Menus and Toolbars in any browser allow the user to change settings and perform browser tasks Browser cache speeds up the display of re-visited web pages Plug-ins run within the browser Browsers can be customized to suit the user style Security is a major issue with internet communications Wireless browsing is different from desktop browsing Chapter 2 - Web Browsers 29 ...
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