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JavaScript: A Beginner s Guide
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Do I always need to use script tags to add JavaScript to a page It s possible to use event handlers that allow you to write short bits of script within the event-handling attribute of an HTML tag You ll learn about event handlers in 7 What about the language attribute With XHTML, the language attribute has been replaced with the type attribute Using the language attribute may cause a Web page to fail XHTML validation (in XHTML strict) and is no longer recommended My page won t validate in XHTML strict (or transitional) when I add a script to it How do I get the page to validate If the script contains characters used in XHTML such as < (which is used for less than in JavaScript but is seen as the beginning of a new tag in XHTML), then the page won t validate with the script directly in the document without adding a CDATA section:
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<script type="text/javascript"> Begins the CDATA section <![CDATA[ var x = 5; var y = 10; if (x < y) { windowalert("x is less than y"); } Ends the CDATA section ]]> </script>
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This will allow the page to validate, but because the <![CDATA[ and ]]> characters are in the script, the script will no longer work To fix this, you need JavaScript comments (/* and */) around those characters when they are within the script tags:
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<script type="text/javascript"> /*<![CDATA[*/ Opening and closing JavaScript comments are placed around <![CDATA[ var x = 5; var y = 10; if (x < y) { windowalert("x is less than y"); } /*]]>*/ Opening and closing JavaScript comments are placed around ]]> </script>
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As you can see, this can get quite tedious very quickly! Typically, the better option is to use an external script file, which eliminates this problem because only the script tags themselves are needed in the XHTML document
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2: Placing JavaScript in an HTML File
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This example displays the phrase The color is red to the viewer either through JavaScript or through the text within the <noscript></noscript> tags
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CAUTION
Some older browsers may not handle the noscript tag correctly and won t display the content in either section If your users have older browsers, another alternative is to display the content on the page and then use JavaScript to enhance the content for those who are able to display it with JavaScript on
Creating Your First Script
Now that you know how to use the HTML script tags to tell browsers about the JavaScript in a document, you re ready to learn how to add the actual JavaScript code between those script tags The first coding example often given to teach any language is one that writes some sort of text to the default output area, commonly known as a basic Hello World script Following that convention, your first script will write a string of text to a Web page
Writing a Hello World Script
Rather than write Hello World, you ll use another line of text for this script: Yes! I am now a JavaScript coder! This requires only a single line of code, using the documentwrite() method, which writes a string of text to the document:
<script type="text/javascript"> documentwrite("Yes! I am now a JavaScript coder!"); </script>
Notice the parentheses and the quotation marks around the text The parentheses are required because the documentwrite() method is a JavaScript function, which takes an argument contained in parentheses You will learn more about JavaScript functions in 4 The quotation marks denote a string of text A string is a type of variable that is defined in JavaScript by placing it inside quotation marks 3 provides details on strings and other types of JavaScript variables The last thing to notice about your script is the semicolon at the end of the line The semicolon signals the end of a JavaScript statement A statement is a portion of code that does not need anything added to it to be complete in its syntax (its form and order) A statement can be used to perform a single task, to perform multiple tasks, or to make calls to other parts of the script that perform several statements Most JavaScript statements end with a semicolon, so it is a good idea to get in the habit of remembering to add one
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