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Appendix C_ Answers to Tutorial Exercises

1. The music jukebox (a) and temperature calculator (d) are good client-side JavaScript applications. Even though the jukebox relies on server storage of the music files, you can create a more engaging and responsive user interface of buttons, swappable images, and information from a plug-in, such as LiveAudio. The temperature calculator is a natural, because all processing is done instantaneously on the client, rather than having to access the server for each conversion. | Answers to Tutorial Exercises This appendix provides answers to the tutorial exercises that appear in Part II of this book Chapters 4 through 12 . Chapter 4 Answers 1. The music jukebox a and temperature calculator d are good client-side JavaScript applications. Even though the jukebox relies on server storage of the music files you can create a more engaging and responsive user interface of buttons swappable images and information from a plug-in such as LiveAudio. The temperature calculator is a natural because all processing is done instantaneously on the client rather than having to access the server for each conversion. The Web site visit counter b that accumulates the number of different visitors to a Web site is a serverside CGI application because the count must be updated and maintained on the server. At best a clientside counter could keep track of the number of visits the user has made to a site and report to the user how many times he or she has been to the site. The storage would require scripting the cookie Chapter 16 . A chat room application c done properly requires server facilities to open up communication channels among all users connected simultaneously. Client-side scripting by itself cannot create a live chat environment. 2. The first task is to determine a valid identifier for the General Motors location in the hierarchy. Then connect the dots 954 Part V Appendixes a. GeneraLMotors.Chevrolet.Malibu b. General_Motors.Pontiac.Firebird c. General_Motors.Pontiac.Bonneville 3. a. Valid because it is one contiguous word. InterCap spelling is fine. b. Valid because an underscore character is acceptable between words. c. Not valid because an identifier cannot begin with a numeral. d. Not valid because no spaces are allowed. e. Not valid because apostrophes and most other punctuation are not allowed. 4. The names I assign here are arbitrary but the paths are not. document.myPicture document.entryForm document.entryForm.nameField .