java barcode generator example Nested if Statement in Java

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Nested if Statement
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Once you begin writing real-world JavaScript applications, you ll discover that the browser will be required to make decisions more complex than those you have seen in examples throughout this book (We purposely keep examples simple so as not to confuse you)
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Figure 3-4 If the user ID is incorrect, but the password is correct, then the browser displays this dialog box
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JavaScript Demysti ed
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Figure 3-5 If both the user ID and password are invalid, this dialog box is shown
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Suppose you built a JavaScript that displays and processes an order form The order form requires the customer to enter a country and postal code among other information regarding the order The JavaScript then validates the country and postal code The following questions must be satis ed by the JavaScript before it decides what to do next: Did the customer enter a country code Did the customer enter a postal code If the customer entered both a country code and postal code, is the country code a valid country code If the country code is a valid country code, is the postal code a valid postal code for that country You probably realize by now that you ll be using a series of if statements to enable a JavaScript to make these decisions However, positioning each if statement in your JavaScript can be tricky, because a second decision is made only if a previous condition is true; otherwise, the second decision is skipped Here s how to position the if statements to validate the country code and postal code Let s assume that if the CountryCode variable and PostalCode variable have a value of less than 1, the customer didn t enter them in the order form Also let s assume that another process in the JavaScript validated the country code and postal code and assign a value to the Valid variable indicating whether these codes are valid
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if (CountryCode > 1) { if (PostalCode > 1) { if (CountryCodeValid == Valid) { if (PostalCodeValid == Valid)
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CHAPTER 3 Condition Statements
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{ //Valid country code and valid postal code } else { //Invalid postal code } } else { //Invalid country code } } else { //Postal code is blank } } else { //Country code is blank }
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This is called nested if statements The innermost if statement is said to be nested in the outer if statement You avoid confusion by lining up the French braces for each code block and then indenting each line, as shown above Nested if statements can be confusing to follow, because the code block of one if statement contains a second if statement This means that you must be very careful when you write a nested if statement to avoid misplacing the open and close French braces It is common for even a professional JavaScript developer to leave off a close French brace, which confuses the browser
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Identifying a Browser
Here s another practical use of nested if statements You ll recall from 1 that not all browsers are the same Some browsers have features that are missing from other browsers You ll learn about those features in more detail throughout this book The problem facing a JavaScript developer is to identify the browser that is running the JavaScript and use features that are available to the browser and turn off features the browser can t handle The following JavaScript identi es the name and version numbers of two of the most common browsers
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Identifying the Browser</title> </head> <body> <script language="Javascript" type="text/javascript"> <!-if (navigatorappName == 'Microsoft Internet Explorer') { alert ('Internet Explorer\n' + navigatoruserAgent) } else { if (navigatorappName == 'Netscape') { alert('Netscape\n' + navigatoruserAgent) } else { alert('Other Browser') } } --> </script> </body> </html>
Most of this JavaScript is probably familiar to you because it is very much like the JavaScripts that you learned to write in the rst two chapters However, you ll notice two new items: the navigator object and a nested if statement N OTE You learned about objects in 1, when you were introduced to the document object An object can have one or more properties and one or more methods A property is information A method is an action taken by the object, such as the write() method of the document object, which writes information onto a document
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