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Appendix C. Glossary

ActiveX

A technology developed by Microsoft to allow components to be created, primarily for Windows computers. ActiveX components, or controls, can be embedded in Web pages.



applet

A Java program that is designed to be embedded in a Web page.



argument

A parameter that is passed to a function when it is called. Arguments are specified within parentheses in the function call.



array

A set of variables that can be referred to with the same name and a number, called an index.



Boolean

A type of variable that can store only two values: true and false.



concatenate

The act of combining two strings into a single, longer string.



conditional

A JavaScript statement that performs an action if a particular condition is true, usually using the if statement.



debug

The act of finding errors, or bugs, in a program or script.



decrement

To decrease the value of a variable by one. In JavaScript, this can be done with the decrement operator, --.



Document Object Model
DOM

The set of objects that JavaScript can use to refer to the browser window and portions of the HTML document. The W3C (World Wide Web Consortium) DOM is a standardized version supported by the latest browsers, and allows access to every object within a Web page.



element

A single member of an array, referred to with an index.



event

A condition, often the result of a user's action, that can be detected by a script.



expression

A combination of variables, constants, and operators that can be evaluated to a single value.



function

A group of JavaScript statements that can be referred to using a function name and arguments.



Hypertext Markup Language
HTML

The language used in Web documents. JavaScript statements are not HTML, but can be included within an HTML document.



increment

To increase the value of a variable by one. In JavaScript, this is done with the increment operator, ++.



interpreter

The browser component that interprets JavaScript statements and acts on them.



Java

An object-oriented language developed by Sun Microsystems. Java applets can be embedded within a Web page. JavaScript has similar syntax, but is not the same as Java.



JavaScript

A scripting language for Web documents, loosely based on Java's syntax, developed by Netscape. JavaScript is now supported by the most popular browsers.



loop

A set of JavaScript statements that are executed a number of times, or until a certain condition is met.



method

A specialized type of function that can be stored in an object, and acts on the object's properties.



Navigator

A browser developed by Netscape, and the first to support JavaScript.



object

A type of variable that can store multiple values, called properties, and functions, called methods.



operator

A character used to divide variables or constants used in an expression.



parameter

A variable sent to a function when it is called, also known as an argument.



property

A variable that is stored as part of an object. Each object can have any number of properties.



scope

The part of a JavaScript program that a variable was declared in and is available to.



statement

A single line of a script or program.



string

A group of text characters that can be stored in a variable.



variable

A container, referred to with a name, that can store a number, a string, or an object.



VBScript

A scripting language developed by Microsoft, with syntax based on Visual Basic. VBScript is supported only by Microsoft Internet Explorer.



XML (Extensible Markup Language)

A generic language developed by the W3C (World Wide Web Consortium) that allows the creation of standardized HTML-like languages, using a DTD (Document Type Definition) to specify tags and attributes.




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