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While using conditional statements, you will see that they are similar to functions in some ways Most notable are the curly brackets ({}) that surround the sections of code that will be executed given a condition To give you a better understanding of how this works, I will explain the basic structure of an if/else statement block: its block structure, block nesting, and complex comparisons

The first thing you must deal with in an if/else statement is the first line, which tells the browser to continue or move along You begin an if/else statement with the JavaScript keyword if, followed by a comparison in parentheses The following line shows a sample of the format of the first line:

the definition information, and then connect to the remote site and download it to the local root folder

if (comparison here)

u Dreamweaver allows up to 20 preview browsers u The primary preview browser launches when you press F12 u The secondary preview browser launches when you press CTRL-F12

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You replace the comparison here text with an actual comparison To do this, you need to remember the comparison operators from the previous chapter Suppose you want to see if a variable named boats is equal to 3 The following is how you write the first line of the if/else block:

(Windows) or COMMAND-F12 (Mac)

if (boats==3)

Remember that a comparison will return a value of true or false This is where the return value becomes useful If the comparison of boats==3 returns true, the browser can go on to the next line If it returns false, the browser begins looking for the else keyword, or the first line of script after the block following the if line is completed If the comparison returns true, you need to make a block of statements after the if line that will be executed To do this, you use the curly brackets similarly to the way you enclose commands for a function The following code shows how to add the brackets to enclose the code that will execute if the comparison returns true:

2:

if (boats==3) { JavaScript Statements Here }

The following questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully because there might be more than one correct answer Choose all correct answers for each question

If the comparison of boats==3 returns true, the code you place within the brackets will be executed If it returns false, the code inside the brackets is ignored and the line of code after the closing curly bracket is executed If you wish to use an else block to execute a certain bit of code when the comparison returns false, you place the else keyword on the next line and then follow it with its own set of curly brackets, as in the following code:

if (boats==3) { JavaScript Statements Here } else { JavaScript Statements Here }

1 When should you enable Design Notes for your Web site A You plan to integrate with Fireworks B You plan to integrate with Flash C You plan to build a dynamic site D You re working in a collaborative environment 2 What is the local root folder A The folder at the top of your site structure in the Site panel B The folder at the root, or bottom, of your site structure in the Site panel C The folder where you store your site on the production server D The folder where you store your site on the development server 3 What kinds of things can you cloak in Dreamweaver A Specific servers B Specific folders C Specific files D Specific file types 4 Your Web site has five choices in the main navigation: Products, News, Partners, About Us, and Contact Us Your site also contains graphics Which of the following is the best structure for your site

The if block begins with the if keyword and the comparison The else block begins with the else keyword

2:

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