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1 Web Developer & Design Foundations with XHTML Chapter 6 Key Concepts
© 2007 Pearson Education 2 Learning Outcomes In this chapter, you will learn how to: –Describe common uses of forms on web pages –Describe the elements used in forms –Create forms on web pages using the,,, and tags –Create forms that provide additional accessibility features using the accesskey and tabindex attributes –Associate form elements and element groups using the,, and tags –Create custom image buttons and use the tag to include more variety and richer content than the standard form button –Describe the features of CGI –Invoke server-side processing to handle form data –Find free CGI resources on the Web
© 2007 Pearson Education 3 Overview of Forms Forms are used all over the Web to –Accept information –Provide interactivity Types of forms: –Search form, Order form, Newsletter sign-up form, Survey form. Etc…. A form is an XHTML element that is used to contain and organize other objects such as text boxes, check boxes, and buttons that can accept information from web site visitors.
© 2007 Pearson Education 4 Two Components of Using Forms 1. The XHTML form itself, which is the web page user interface and 2.The server-side processing, called CGI for Common Gateway Interface, which works with the form data and sends email, writes to a text file, updates a database, or performs some other type of processing on the server.
© 2007 Pearson Education 5 XHTML Using Forms tag –Used to contain the form elements on a web page –Container tag tag –Used to configure a number of form elements including text boxes, radio buttons, check boxes, and buttons –Stand alone tag tag –Used to configure a scrolling text box –Container tag tag –Used to configure a select box (drop down list) –Container tag tag –Used to configure an option in the select box –Container tag
© 2007 Pearson Education 6 Email: Sample Form XHTML
© 2007 Pearson Education 7 XHTML tag The form tag attributes: –action Specifies the server-side program or script will process your form data –id Identifies the form –method get – default value, form data passed in URL post – more secure, form data passed in HTTP Entity Body –name Identifies the form
© 2007 Pearson Education 8 XHTML tag Text box Used to accept text information Attributes: –type=“text” –name –size –maxlength –value
© 2007 Pearson Education 9 XHTML tag Password box Used to accept text information that needs to be hidden as it is entered Attributes: –type=“password” –name –size –maxlength –value
© 2007 Pearson Education 10 XHTML tag Check box Used to allow the user to select one or more of a group of predetermined items Attributes: –type=“checkbox” –name –checked –value
© 2007 Pearson Education 11 XHTML tag Radio Button Used to allow the user to select exactly one from a group of predetermined items Each radio button in a group is given the same name and a unique value Attributes: –type=“radio” –name –checked –value
© 2007 Pearson Education 12 XHTML tag Scrolling Text Box Used to configure a scrolling text box Attributes: –name –cols –rows –value
© 2007 Pearson Education 13 XHTML tag Select List Used (along with tags) to configure a Select List. This form element is often referred to by several different names: Select List, Select Box, Drop-Down List, Drop-Down Box, and Option Box. Used to allow the user to select one or more items from a list of predetermined choices. Attributes: –name –size –multiple
© 2007 Pearson Education 14 XHTML tag Options in a Select List Used to configure the options in a Select List Attributes: –value –selected
© 2007 Pearson Education 15 XHTML tag Submit Button Used to submit the form When clicked, it triggers the action method on the tag and causes the browser to send the form data (the name and value pairs for each form element) to the web server. Attributes: –type=“submit” –name –value
© 2007 Pearson Education 16 XHTML tag Reset Button Used to reset the form fields to their initial values Attributes: –type=“reset” –name –value
© 2007 Pearson Education 18 XHTML tag Hidden form element This form element is not displayed on the web page. Hidden form fields can be accessed by both client-side and server-side scripting and are sometimes used to contain information needed as the visitor moves from page to page. Attributes: –type=“hidden” –name –value
© 2007 Pearson Education 19 Name: Email: XHTML Using a Table to Format a Form
© 2007 Pearson Education 20 Checkpoint 6.1 1. You are designing a web site for a client who sells items in a retail store. They want to create a customer list for e- mail marketing purposes. Your client sells to consumers and needs a form that accepts their customer’s name and e-mail address. Would you recommend using two input boxes (one for the name and one for the e-mail) or three input boxes (for the first name, last name, and email address)? Explain your answer.
© 2007 Pearson Education 21 Checkpoint 6.1 2. You are designing a survey form for a client. One of the questions has 10 possible responses. Only one response can be selected per question. What type of form element would you use to configure this question on the web page? 3. True or False. In a radio button group, the value attribute is used by the browser to process separate elements as a group.
© 2007 Pearson Education 22 XHTML Form Enhancements tag The label tag Email: Or Email: Container tag Used to associate a text message with a form element
© 2007 Pearson Education 23 XHTML Form Enhancements & tags The fieldset tag –Container tag –Used to create a visual group of form elements on a web page The legend tag –Container tag –Used to create a text label within the fieldset Customer Information Name: Email:
© 2007 Pearson Education 24 XHTML Form Enhancements tabindex attribute Attribute that can be used on form elements and anchor tags Not supported by all browsers Used to modify the default tab order Assign a numeric value
© 2007 Pearson Education 25 XHTML Form Enhancements accesskey attribute Attribute that can be used on form elements and anchor tags Not supported by all browsers Used to create a “hot-key” combination to place the focus on the component Assign a value of a keyboard letter On Windows use the CTRL and the “hot- key” to move the cursor
© 2007 Pearson Education 26 XHTML Form Enhancements tag Image Button Used to submit the form When clicked, it triggers the action method on the tag and causes the browser to send the form data (the name and value pairs for each form element) to the web server. Attributes: –type=“image” –name –src
© 2007 Pearson Education 27 XHTML Form Enhancements tag The button tag A container tag When clicked, its function depends on the value of the type attribute. Can contain a combination of text, images, and media Attributes: –type=“submit”, type=“reset”, type=“button” –name –value
© 2007 Pearson Education 28 Checkpoint 6.2 1.Describe the purpose of the fieldset and legend tags. 2.Describe the purpose of the accesskey attribute and how it supports accessibility. 3.When designing a form, should you use the standard submit button, an image button or a button tag? Are these different in the way that they provide for accessibility? Explain your answer.
© 2007 Pearson Education 29 Server-Side Processing Your web browser requests web pages and their related files from a web server. The web server locates the files and sends them to your web browser. The web browser then renders the returned files and displays the requested web pages for you to use.
© 2007 Pearson Education 30 CGI Common Gateway Interface CGI is a protocol or standard method for a web server to pass a web page user's request (which is typically initiated through the use of a form) to an application program and accept information to send to the user. The web server typically passes the form information to a small application program that processes the data and usually sends back a confirmation web page or message.
© 2007 Pearson Education 31 Using CGI A web page invokes CGI by either an action method on a form or a hyperlink -- the URL of the server-side script or program is used. Any form data that exists is passed to the server-side CGI script. The server-side script completes its processing and may create a confirmation or response Web page with the requested information. The web server returns this page to the web browser.
© 2007 Pearson Education 32 Languages that support CGI Programs or scripts that work with CGI can be written in many languages: PHP Perl C C++ Active Server Pages (ASP) Java Server Pages (JSP) ASP.NET Ruby on Rails And so on….
© 2007 Pearson Education 33 Steps in Utilizing CGI 1.Web page invokes CGI by a form post, action, hyperlink, etc... – Any form information is sent in the form of name=value pairs to the web sever. 2. Script on web server is executed 3. Script accesses requested database, file, or process 4. Web server returns web page with requested information or confirmation of action
© 2007 Pearson Education 34 Common Uses of Server-Side Scripting & CGI Search a database Place an order at an online store Send a web page to a friend Subscribe to a newsletter Any type of server-side file or e-mail processing is a candidate for CGI
© 2007 Pearson Education 35 Sources of Free Server-Side Processing Many web host providers offer free scripts for their clients. Contact their support area or FAQ to learn more about their services. Some web sites that offer remotely hosted scripts (in return for displaying an ad). –http://formbuddy.comhttp://formbuddy.com –http://hostedscripts.comhttp://hostedscripts.com –http://response-o-matic.comhttp://response-o-matic.com –http://master.comhttp://master.com –http://www.formmail.comhttp://www.formmail.com Microsoft FrontPage has Server Extensions that provide form processing: sending form data in emails, saving form data in files, and saving form data in databases.
© 2007 Pearson Education 36 Checkpoint 6.3 1.Describe CGI. 2.Code the form tag for a web page form that will use the post method to invoke a server-side script located at http://webdevfoundations.net/scripts/subscribe.asp http://webdevfoundations.net/scripts/subscribe.asp
© 2007 Pearson Education 37 Summary This chapter introduced the use of forms on web pages. You learned about how to configure form elements and provide for accessibility. You also learned how to configure a form to access server-side processing
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