Computer Programming Concepts and Visual Basic David I. Schneider

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396 Computer Programming Concepts and Visual Basic Private Sub cmdBack_Click() WebBrowser1.GoBack ‘Return to the previous web site or page End Sub Private Sub cmdPH_Click() WebBrowser1.Navigate (“http://www.prenhall.com”) End Sub [Run. After the Internet Explore home page appears, click on the command button with the picture of the Prentice-Hall trademark.] COMMENTS 1. The abbreviation HTTP stands for HyperText Transfer Protocol. 2. Some additional properties of the Web Browser control are LocationURL Gives the URL of the current page. LocationName Gives the title of the current page. Busy Has the value True if the control is downloading a file or navigating to a new location. 3. Some additional methods of the Web Browser control are GoForward Undoes the most recent GoBack method. GoSearch Goes to the user’s web searching page. Stop Cancels the current operation of the control. 4. Some additional events of the Web Browser control are BeforeNavigate Triggered right before the control moves to a new location. ProgressChange Triggered periodically as the downloading continues.
DownloadComplete Triggered when the download is complete, halter, or failed. 5. If a file on your disk is an HTML document, you can view it as a web page with the statement WebBrowser1.Navigate “filespec”. 6. Three good books about the Internet are C.L. Clark, A Student’s Guide to the Internet, Prentice Hall, Inc. 1996. B. P. Kehoe, Zen and the Art of the Internet, Prentice Hall, Inc. 1996. K. Hafner and M. Lyon, Where Wizards Stay Up Late: The Origins of the Internet, Simon & Schuster, 1996. 13.3 WEB PAGE PROGRAMMING WITH VBSCRIPT Note: This section requires that the Internet Explorer Web browser be installed on your computer. Web browsers display Web pages created as text files, called HTML 1 [stands for Hyper- Text Markup Language] documents. The text files can be written with Notepad or any other word processor. VBScript is a subset of the Visual Basic programming language that is used to make Web pages interactive. (You can use any VBScript code in VB itself.) In this section, we learn how to create Web pages with HTML, add controls to Web pages, and write VBScript code that manipulates the controls. ■ HTML Here is a typical line in an HTML document. This sentence will be printed in bold. The items and are called tags. Here the letter B stands for Bold and the pair of tags tells the browser to display everything between the two tags in boldface. The first tag is called the begin tag and the second tag is called the end tag. Most tags come in pairs in which the second tag differs from the first only in the addition of a slash (/). The combination of pair of tags and the data characters enclosed by them is called an element. In general, a tag defines a format to apply or an action to take. A pair of tags tells the browser what to do with the text between the tags. Some pairs of tags and their effect on the text between them are as follows. , Display the text in italics , Display the text underlined. , Display the text in a size n header (1 ≤ n ≤ 6) , Display the text one font size larger. , Display the text one font size smaller. , Center the text. , Place the text in the Web page title bar. An example of a tag that does not come in pairs is , which tells the browser to start a new paragraph and insert a blank line. A similar tag is which inserts a carriage return and a line feed to start a new line. The lines Line One Line Two in an HTML document will be displayed as Line One Line Two in the Web page, since browsers combine all the white space (including spaces, tabs, and line breaks) into a single space. On the other hand, Line One Line Two Web Page Programming With VBScript 397
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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S E C T I O N 6 ARRAYS
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S E C T I O N 7 SEQUENTIAL FILES
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S E C T I O N 8 RANDOM-ACCESS FILES
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S E C T I O N 9 THE GRAPHICAL DISPL
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10.1 LIST BOXES AND COMBO BOXES The
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Private Sub cmdAdd_Click() Dim item
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either typing in information or jus
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Private Sub cmdDisplay_Click() picF
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clicks on the square to toggle betw
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circle and the button is said to be
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hsbBar.Value changes accordingly. T
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THE SHAPE CONTROL The shape control
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FIGURE 10-9 A Picture Created with
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Rows 9 ScrollBars 0 - flexScrollBar
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Private Sub cmdQuit_Click() End End
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Here, the menu bar contains two men
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Clipboard.Clear deletes the content
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cedures that are available to all f
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The Flags property influences certa
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13. Additional forms serve as new w
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6. Voting Machine. The members of t
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11.1 AN INTRODUCTION TO DATABASES T
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9. Click on the down arrow to the r
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clicked or a Move, Update, Delete,
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Do While (Not foundFlag) And (Not d
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mary key. Databases of student enro
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question mark stands for a single c
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1995 populations. When the second c
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If a Find method does not locate a
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place an x in the check box next to
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population (in descending order). W
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Creating and Designing Databases 34
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Page 413: A P P E N D I C E S
Page 431 and 432: APPENDIX C VISUAL BASIC STATEMENTS,
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Page 439 and 440: ENVIRON Visual Basic has an environ
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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Computer Programming Concepts and Visual Basic David I. Schneider

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