Beginning Web Development With Perl : From Novice to ... - Nabo

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CHAPTER 1 ■ THE CGI MODULE 13When the code is saved to a web server and viewed through a browser, it should look likeFigure 1-3. It looks like a regular form, but don’t bother filling in the name and clicking on submityet. There’s no code to handle it!Figure 1-3. A form created with CGI module functionsViewing the source code for the resulting HTML page reveals what this bit of Perl code didin the background:HelloEnter your name: As you can see, the start_form() function inserted a tag into the page. It automaticallymade the method a POST and set the action to itself—"/cgi-bin/name.cgi", in this case. Youcould change both of these parameters by providing them within the call to the start_form()function, as in this example:start_form(-method=>'GET',-action=>"/cgi-bin/someothercgi.cgi")The code would then produce a form tag like this:
14CHAPTER 1 ■ THE CGI MODULEHowever, for this example, leave the form method and action at their defaults (POST and/cgi-bin/name.cgi).Making the form actually perform some action means that you need to handle parameterswithin the program. To do so, you can simply check whether the param() function returnstrue.if (param()) {#do something}Listing 1-4 shows a more complete function added to the code shown in Listing 1-3.Listing 1-4. Printing the Name Input Using the CGI Module#!/usr/bin/perl -Tuse strict;use CGI qw/:standard/;print header,start_html('Hello'),start_form,"Enter your name: ",textfield('name'),submit,end_form,hr;if (param()) {print "Hello ",param('name'),p;}print end_html;exit;■Tip The basic if (param()) type of check is commonly used to determine whether to serve the defaultpage or whether to process the CGI parameters. For example, if there are parameters within param(),thenthe CGI will output “Hello,” along with the value that was filled in for the text field that is contained inparam('name').
Page 3 and 4: Beginning Web Development with Perl
Page 5 and 6: PART 5 ■ ■ ■ Creating Web Tem
Page 8 and 9: ■CONTENTSvii■CHAPTER 4 System I
Page 10 and 11: ■CONTENTSixCreating a SOAP Listen
Page 12 and 13: ■CONTENTSxiTemplate Toolkit Synta
Page 14 and 15: About the Author■STEVE SUEHRING i
Page 16 and 17: AcknowledgmentsThanks to James Lee
Page 18 and 19: xx■INTRODUCTIONThis book will use
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Page 54 and 55: CHAPTER 2 ■ POPULAR CGI MODULES 3
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64CHAPTER 3 ■ DATABASES AND PERLA
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66CHAPTER 3 ■ DATABASES AND PERLm
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68CHAPTER 3 ■ DATABASES AND PERLm
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70CHAPTER 3 ■ DATABASES AND PERLT
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72CHAPTER 3 ■ DATABASES AND PERLT
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74CHAPTER 4 ■ SYSTEM INTERACTION
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76CHAPTER 4 ■ SYSTEM INTERACTIONt
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78CHAPTER 4 ■ SYSTEM INTERACTIONc
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80CHAPTER 4 ■ SYSTEM INTERACTIONA
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82CHAPTER 4 ■ SYSTEM INTERACTIONm
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84CHAPTER 4 ■ SYSTEM INTERACTIONs
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86CHAPTER 4 ■ SYSTEM INTERACTIONr
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CHAPTER 5■ ■ ■LWP ModulesLWP
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CHAPTER 5 ■ LWP MODULES 91HTTP Re
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CHAPTER 5 ■ LWP MODULES 93Get Fun
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CHAPTER 5 ■ LWP MODULES 95When ca
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CHAPTER 5 ■ LWP MODULES 99Recall
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CHAPTER 5 ■ LWP MODULES 101which
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CHAPTER 5 ■ LWP MODULES 103For th
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CHAPTER 5 ■ LWP MODULES 105Obviou
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108CHAPTER 6 ■ NET:: TOOLSCreatin
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110CHAPTER 6 ■ NET:: TOOLSThe out
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112CHAPTER 6 ■ NET:: TOOLSmy $pop
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114CHAPTER 6 ■ NET:: TOOLSthe POP
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116CHAPTER 6 ■ NET:: TOOLS($messa
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118CHAPTER 6 ■ NET:: TOOLSListing
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120CHAPTER 6 ■ NET:: TOOLSFor the
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122CHAPTER 6 ■ NET:: TOOLSNet::SM
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124CHAPTER 6 ■ NET:: TOOLS$smtpco
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126CHAPTER 6 ■ NET:: TOOLSuse Net
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128CHAPTER 6 ■ NET:: TOOLSListing
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130CHAPTER 6 ■ NET:: TOOLSFor exa
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132CHAPTER 6 ■ NET:: TOOLSSending
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PART 3■ ■ ■XML and RSS
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138CHAPTER 7 ■ SOAP-BASED WEB SER
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154CHAPTER 8 ■ PERL AND RSSFigure
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156CHAPTER 8 ■ PERL AND RSShttp:/
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158CHAPTER 8 ■ PERL AND RSSDebugg
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160CHAPTER 8 ■ PERL AND RSS$rsswr
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162CHAPTER 8 ■ PERL AND RSSListin
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CHAPTER 9■ ■ ■XML Parsing wit
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CHAPTER 9 ■ XML PARSING WITH PERL
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PART 4■ ■ ■PerformanceEnhance
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184CHAPTER 10 ■ APACHE AND MOD_PE
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202CHAPTER 11 ■ DEVELOPMENT WITH
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CHAPTER 12■ ■ ■The Template T
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CHAPTER 12 ■ THE TEMPLATE TOOLKIT
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CHAPTER 13■ ■ ■Perl Web Sites
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CHAPTER 13 ■ PERL WEB SITES WITH
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284APPENDIX ■ PERL BASICSKeywords
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286APPENDIX ■ PERL BASICS$ perl n
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288APPENDIX ■ PERL BASICSAnd line
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290APPENDIX ■ PERL BASICSCan you
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292APPENDIX ■ PERL BASICSBy defau
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294APPENDIX ■ PERL BASICS#!/usr/b
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296APPENDIX ■ PERL BASICSThe last
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298APPENDIX ■ PERL BASICSThe NOT
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300APPENDIX ■ PERL BASICSprint "S
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302APPENDIX ■ PERL BASICSthe syst
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304APPENDIX ■ PERL BASICS$ perl s
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306APPENDIX ■ PERL BASICSThis cod
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308APPENDIX ■ PERL BASICS$a = 6 *
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310APPENDIX ■ PERL BASICS$a = "A9
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312APPENDIX ■ PERL BASICS#!/usr/b
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314APPENDIX ■ PERL BASICSmy $name
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316APPENDIX ■ PERL BASICSis short
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318APPENDIX ■ PERL BASICSLet’s
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320APPENDIX ■ PERL BASICSOther Te
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322APPENDIX ■ PERL BASICS}}}actio
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324APPENDIX ■ PERL BASICSNotice t
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326APPENDIX ■ PERL BASICSLooping
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328APPENDIX ■ PERL BASICSuse stri
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330APPENDIX ■ PERL BASICSuntil ($
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332APPENDIX ■ PERL BASICSuse stri
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334APPENDIX ■ PERL BASICSdoneAll
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336APPENDIX ■ PERL BASICS$ perl r
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338APPENDIX ■ PERL BASICSSummaryT
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340■INDEXmethods for retrieving r
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342■INDEXdo() method for, 62dumpi
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344■INDEXhello option for Net::SM
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346■INDEXNet::DNS module, 125-128
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348■INDEXrecord with Net::DNS mod
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350■INDEXstoring mail server in e
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352■INDEXlogging based on, 229pri
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Beginning Web Development With Perl : From Novice to ... - Nabo

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