barcode generator dll in vb.net Copyright 2005 by The McGraw-Hill Companies, Inc Click here for terms of use in Java

Generate QR in Java Copyright 2005 by The McGraw-Hill Companies, Inc Click here for terms of use

Copyright 2005 by The McGraw-Hill Companies, Inc Click here for terms of use
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Building Blocks of a Form
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As you probably remember from when you learned HTML, a form is a section of an HTML document that contains elements such as radio buttons, text boxes, check boxes, and option lists HTML form elements are also known as controls Elements are used as an ef cient way for a user to enter information into a form Forms are used for all kinds of purposes In a business, forms are used to gather order information from a customer Forms are also used for online surveys Teachers use forms for online tests Information entered into a form is sent to the web server for processing when the user clicks a submit button The program that processes the form is called a Common Gateway Interface (CGI) program CGI programs are written in one of a number of programming languages, including JSP, PHP, Perl, and ASP CGI programs typically interact with non-web applications such as databases and other systems that are necessary to process the form Once processing is completed, the CGI program usually creates another web page dynamically and sends the web page to the browser that sent the form
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Elements and JavaScript
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Each element has one or more attributes, which is information associated with the element For example, the value attribute is used to de ne a default value, not the user-entered value A good example would be the name attribute, since this attribute is used to reference the element You ll learn about the different kinds of attributes that are available for each element throughout this chapter as each element is discussed Many applications require that some information contained on a form be veri ed using a validation process Two common ways to validate information on a form are by using CGI programs and JavaScripts A CGI program validates information after the form is submitted A JavaScript can validate information whenever one of several events occurs while the form is displayed on the screen You ll learn about these events in the Responding to Form Events section of this chapter Validation should occur on both the client (via JavaScript) and the server (via a CGI program) The client-side validation provides immediate feedback and reduces load on the server It s good practice to validate again on the server because you don t always know that the JavaScript executed properly on the browser You could make an exception to this if you require that JavaScript be enabled in order to use a web site (but that s more of a business decision) In addition to validating information, JavaScripts can dynamically change a form while the form is displayed on the screen For example, a JavaScript can activate or deactivate elements based on a value the user enters into another element You can
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CHAPTER 7 Forms and Event Handling
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also set the default value of elements based on a value entered by a user into another element A JavaScript can interact with elements of a form in many ways You ll learn about them in this chapter However, you won t learn about creating a form here; instead, you ll see examples of forms that are used to illustrate JavaScripts Pick up a copy of HTML: The Complete Reference, Third Edition by Thomas A Powell or How to Do Everything with HTML by James H Pence (both books published by McGraw-Hill/Osborne) if you need to brush up on how to create forms
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Responding to Form Events
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A JavaScript executes in response to an event that occurs while a form is displayed on the screen An event is something the user does to the form, such as clicking a button, selecting a radio button, or moving the cursor away from an element on the form The browser also res events when the page nishes loading from the server You can execute a script each time one of the form events listed in Table 7-1 occurs An event is associated with an element of a form as a attribute de ned within the opening tag of the element You assign this attribute the name of the JavaScript function that you want executed when the event occurs Let s say that your form has an input element in which the user enters his or her rst and last names and e-mail address (Figure 7-1) You want a JavaScript to validate the e-mail address by checking whether the address includes an @ sign when the user moves the cursor away from the input element You do this by using the onblur event attribute in the opening <INPUT> element tag and assigning the name of the JavaScript function to the onblur event attribute The onblur event occurs when the cursor moves away from the element, which is called losing focus The following example illustrates how this is done
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>onblur event</title> <script language="Javascript" type="text/javascript"> <!-function ValidateEmail(EmailAddress) { var Location = EmailAddressindexOf('@') if ( Location == -1) { alert
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