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The Main Event
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Another basic concept that you need to understand is event handling An event causes your JavaScript to start executing the code such as when you click the mouse button on a form that your JavaScript displays on the screen Your JavaScript is told of every event that occurs while your JavaScript is running Some events are particularly important to your JavaScript, such as when someone clicks a Submit or Cancel button on a form Other events may not be so important, such as when the mouse is moved onto an area of the form that contains no information The nature of your application determines whether or not an event is important Your job is to make sure that your JavaScript reacts to important events This is referred to as event handling You do this by creating an event handler, which is a part of your JavaScript that reacts to important events For example, the event handler for a Submit button click event will likely contain JavaScript instructions that process information the user entered on the form, and the process instructions will make sure that the user entered all the required information on the form
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CHAPTER 1 An Inside Look at JavaScript
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That s all you need to know about events and event handling for now Later on you ll learn everything you need to know to have your JavaScript react to important events
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Writing Your First JavaScript
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It is time to write your rst JavaScript In keeping with a long programming tradition, the objective of your rst script is to write Hello, world! to a document object Granted this JavaScript isn t the most exciting to write, but the more exciting JavaScripts are yet to come For now, it is important that you learn how to write a basic JavaScript A JavaScript consists of JavaScript statements that are placed within the <script> HTML tags in a web page This means that you don t need any special tools to write a JavaScript You can use the same tools to write a JavaScript that you use to write your web page You place the <script> tag containing your JavaScript in one of two places within the web page either within the <head> tags or within the <body> tags Developers call scripts within the <head> tag header scripts and scripts placed within the <body> tag body scripts You ll learn more about the differences between header and body scripts later in this book Now for the moment that you ve been waiting for You ll create the web page shown in Figure 1-1
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Hello world! JavaScript</title> </head> <body> <script language="Javascript" type="text/javascript"> documentwrite('Hello, world!') </script> </body> </html>
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No doubt most of this code looks familiar, since you ve probably written something similar to it many times before The rst two lines are standard in every web page Next is the <head> tag that contains the title of the web page This is followed by the <body> tag
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JavaScript Demysti ed
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Figure 1-1
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Your rst JavaScript displays Hello, world! in a web page
Within the <body> tag is the <script> tag that contains the one-line JavaScript The <script> tag is very similar to other HTML tags in that it has an opening (<script>) tag and ending (</script>) tag The <script> tag also has two HTML attributes: language and type The <script> tag signals the browser that a script is coming not HTML The browser processes scripts differently than HTML The language attribute is assigned the value "Javascript", which informs the browser that the scripting language is JavaScript The type attribute tells the browser that the script is in plain text and that the text is organized in the format of a JavaScript This simply gives the browser information on how to read the JavaScript code Everything between the opening <script> and ending </script> tags is the script and must be written using JavaScript This example is a one-line script First, the line is a JavaScript statement A statement is like a sentence that tells the browser to do something Next, you notice the dot syntax This is a clue telling you that the JavaScript statement contains an object, which in this case is named document You also notice something on the right side of the dot Knowing that the left side of the dot is the name of an object, you probably gure that the right side of the dot must be either a property or method of the object In this example, it s a method The clue that gives this away are the parentheses and you read about the write() method previously in this chapter
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