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Making Decisions in JavaScript in Java

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Making Decisions in JavaScript

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The Navigator object defined in Table 9-1 provides the user with information regarding the browser The name and version of the browser are identifiable using the Navigator object NavigatorappName will return a shortened name for the browser NavigatoruserAgent will return nearly everything about the user s web environment A common usage is to check the browser compatibility with a web site For example, YouTubecom checks your browser to see if it can display the videos on its site Decisions in JavaScript are made using the if statement An if statement checks a condition and reacts according to whether the condition is true or false We use if statements every day in our life If it is raining, we open an umbrella; otherwise, we close the umbrella Your if statements will be similar If the browser is Internet Explorer, do one chunk of code; otherwise, do something else Code Block 9-2 displays a message to the user based on which browser she is using If the browser is Internet Explorer, a message to the Internet Explorer user is displayed Otherwise, a message is displayed to the non Internet Explorer user The following illustrations display the output in Internet Explorer (left) and in Firefox (right)

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H T M L & XHTML Demys tifieD

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Code BloCk 9-2

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<body> <h1>Browser Detect</h1> <script type="text/JavaScript"> if(navigatorappName == "Microsoft Internet Explorer"){ documentwrite("You are using Internet Explorer!"); } else { documentwrite("You are <b>not</b> using Internet Explorer!"); } </script> </body>

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Variables

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Quite often programmers need to hold data in their programs Data is held in a variable A variable, similar to algebra class, can hold many things JavaScript variables can hold anything from your name, to your age, to a text box from a form JavaScript programs use variables to save and store data for future use By using a variable, you can reduce the amount of code you have to type Creating a variable in JavaScript is much easier than in other programming languages JavaScript does not care what type of data is stored in its variables All that you have to do is create the variable by using the var keyword, followed by a word that identifies the variable

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tip Variable names should reflect what you intend for them to hold Additionally,

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they cannot contain spaces, nor start with a number

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9 J a v a S C r i p T

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Many different examples of a variable exist Code Block 9-3 shows the JavaScripting creating three variables holding my name, my age, and my age in dogYears DogYears is calculated by multiplying my current age by 7 I display the name, age, and dogYears variables in documentwrite lines

Code BloCk 9-3

To display the content of the variable, I created a <p> tag Inside I put the words I wanted displayed inside of a set of double quotes The variables are held outside of the quotes, surrounded by plus (+) signs The plus signs add the value of the variable to the words in the paragraph Notice that the value of the variable is displayed The output is shown in this illustration

Practice Creating Inline Scripts

In this section you will create a greeting script A variable called today will be created holding the current date and time The variable today will be created using the Date object The Date object will generate the current time and place it within the today variable Finally, the getHours method will return the military time If the time is before 12, a good morning message will be returned

Making Decisions in JavaScript in Java Generator Quick Response Code in Java Making Decisions in JavaScript

Making Decisions in JavaScript in Java

Generator Quick Response Code in Java Making Decisions in JavaScript