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JavaScript Programmer’s Reference Warnings: . In Netscape, the arguments array is implemented as an object of type Arguments but in MSIE its type is simply an Object object. In Netscape, the arguments object is extended with a toString() mechanism that returns the arguments as a comma separated list in a String. In MSIE, you get the object type. . None of the properties of the arguments object are enumerable. . Because the arguments object is meant to be used in a manner that is local to the function it was created in, you get unpredictable results if you pass it to another function as an argument itself. . Note that at the time of writing the example given below did not seem to work on Netscape 6.0. Example code: See also: Argument, Argument list, Arguments.callee, Arguments.caller, Arguments.length, arguments[], Collectionobject, Execution context, Function arguments, Function call, Function call operator ( ), function( … ) …, Function.arguments[], Object inspector, Object.prototype, Parameter

A Arguments object (Object/core) Cross-references: ECMA 262 edition 2 section 11.2.4 ECMA 262 edition 3 section 11.2.4 Arguments object (Object/core) An object represented as an array containing the argument values passed to the function when it is called. Availability: ECMAScript edition 2 JavaScript 1.1 JScript 5.5 Internet Explorer 5.5 Netscape 3.0 JavaScript syntax: -myArguments = arguments Object properties: callee, caller, length When you call a function, you can pass zero or more arguments to it from outside. These arguments are available as named variables whose names are defined in the function declaration. However, they are also available as the elements in an array. The arguments array is referenced by the arguments property of the callobject. Since the call object is added to the scope chain, you don’t need to reference the argumentsproperty with an object identifier prefix. The array-based mechanism is useful for those times when you want to implement a function that has a variable number of arguments passed to it according to how and when it is called. A new arguments object is created for each execution context. When the flow of control enters an execution context for a function block, a new arguments object is created. Declared functions, anonymous code, and implementation-specific code all use this technique. When creating the argumentsobject, the initial conditions are set up like this: . The internal Prototype property for the argumentsobject is that returned by calling Object.Prototype. . A property is created with the name callee. The callee property cannot be enumerated. The initial value of the callee property is the function object being executed. Anonymous functions can then be executed recursively if you so desire. . A property named length is created whose value is the number of arguments passed to the function. The length property cannot be enumerated. . Each argument is associated with a property whose name is its integer position in an array of arguments. The arguments are accessed in presentation order. Although the names are strings, they represent purely numeric values and range from 0 to 1 less than the value in the length property. You can enumerate the arguments in a forloop. Note that objects of this type can only exist within a function body in a web browser, because you cannot pass parameters to a script from outside. It is possible that an embedded JavaScript interpreter may provide a hostobject to the main entry point to perform the same function.

JavaScript Programmer’s Reference In general, the first argument is the name of the script or program being executed. The argc value should never be zero and as a minimum should indicate that there is at least one argument. The actual values of the arguments are collected in an array called argv. You should be able to access argv and argc in a similar manner. See also: argv parameter, Execution context, Execution environment, Host environment, main() function Argument (Definition) A value passed to a function. Arguments are passed to functions when they are called. They are substituted for the formal parameters in the function declaration. Because JavaScript is weakly typed, you will need to implement any type checking you need for yourself. You can compare the arity property of the owning function with the length property of the argumentsarray. If they are unequal, then the function was called with the wrong number of arguments. You can then check the type of the arguments one by one to compare them against the expected types. This is a lot of work for little gain unless it is an important aspect of your design. See also: Arguments object, Arguments.length, Conversion, Definition, Function, function( ) …, Function.arguments[], Parameter Argument list (Definition) A list of values that are passed to a function. Availability: ECMAScript edition 2 Argument lists are used to pass information into functions. An argument list can have any of the following structures: . Empty no arguments . A single argument . A series of arguments separated by commas Each argument, if present, can be an expression that will be evaluated and whose resulting value will be used as the argument when it is passed to the function. See also: Arguments object, Arguments.length, Function.arguments[], Left-Hand-Side expression, Parameter

A Area.y (Property) The horizontal position of the object in the display measured in pixels. You can use the x and y coordinates of the object as targets of the scrollTo()method for the window it lives in. See also: Location.x Area.y (Property) Netscape provides this as an enumerable property because it represents an as a Url object. JavaScript 1.2 Number primitive myArea.y N Availability: Netscape 4.0 Property/method value type: JavaScript syntax: The vertical position of the object in the display measured in pixels. You can use the x and y coordinates of the object as targets of the scrollTo()method for the window it lives in. See also: Location.y areas[] (Collection) A collection of all the Area objects that contribute to making an image map for the page. JScript 3.0 IE myMap.areas Availability: Internet Explorer 4.0 JavaScript syntax: See also: Map.areas[] Property attributes: ReadOnly. argc parameter (Definition) A command-line argument count. Since JavaScript can be used in many environments, it is possible that in a server-side application you will have access to the command-line arguments. If that is the case, then it is likely that you will have an argc property, which indicates how many arguments have been passed.

JavaScript Programmer’s Reference Area.target (Property) MSIE represents URLs in Link objects. Availability: DOM level 1 JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.target HTML syntax:

A Area.shape (Property) Area.shape (Property) The shape of the extent area within the map. Availability: DOM level 1 JavaScript 1.5 JScript 1.0 Internet Explorer 3.02 Netscape 6.0 Property/method value type: String primitive JavaScript syntax: -myArea.shape This property has a meaningful value when the Area object is instantiated via

JavaScript Programmer’s Reference Area.protocol (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.protocol See also: IMG.protocol, URL, Url.protocol Area.search (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.search See also: request., Url.search

A Area.noHref (Property) Area.noHref (Property) A Boolean flag to indicate whether the area is a link or a dead spot within the map. Availability: DOM level 1 JavaScript 1.5 JScript 3.0 Internet Explorer 4.0 Netscape 6.0 Property/method value type: Boolean primitive JavaScript syntax: -myArea.noHref When a shaped area is defined within a an image map, it can either define a live hotspot or a hole that has been cut out in the map. In this way, both concave and convex shapes can be created. You can also create shapes with holes in the middle. Area.pathname (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.pathname See also: Url.pathname Area.port (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: Number primitive JavaScript syntax: -myArea.port See also: Url.port

JavaScript Programmer’s Reference Area.href (Property) MSIE represents URLs in Link objects. Availability: DOM level 1 JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.href HTML syntax: See also: Location.href, Url.href Area.name (Property) This corresponds to the NAME attribute of the HTML tag. Availability: JavaScript 1.1 JScript 3.0 Internet Explorer 4.0 Netscape 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.name Objects are identified either by the NAME HTML tag attribute or by the ID HTML tag attribute. Netscape shows a marginal preference for the name property, while MSIE seems slightly better disposed towards the ID property. However, in many cases both browsers support either technique and in some cases will locate items named with either tag as if they existed in a single namespace. See also: Url.name

A Area.hash (Property) Area.hash (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.hash See also: Url.hash Area.host (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.host See also: Url.host Area.hostname (Property) MSIE represents URLs in Link objects. Availability: JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.hostname See also: Url.hostname