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Chapter number See also: Prototype Based Inheritance, Prototype chain, prototype property Cross-references: ECMA 262 edition 2 section 10.1.4 Shell Scripting with JavaScript (Definition) Unix command line tools written in JavaScript. Once you have a JavaScript interpreter installed on your system, possibly to provide a server-side or CGI handling mechanism, you can easily use it then to do the things you might previously have done in Perl, Tcl, Bourne, Korn or C-Shell. Not that you would necessarily choose JavaScript over the other alternatives but for some projects it might be better suited due to the kind of data you are manipulating or what you need to do to it. The main strength of the Unix environment is the way multiple scripting languages can be used at will and a project may be built from code that runs in many different environments and contexts. See also: CGI Driven JavaScript, Host environment, Platform, Server-side JavaScript Cross-references: Wrox Instant JavaScript page 5 Shift expression (Definition) Shifts the left value by an amount specified by the right value. Availability: Property/method value type: ECMAScript edition 2 Number primitive Bitwise shift operators convert their left operands to a 32-bit integer value and shift them according to their right operation. The operator determines the kind of shifting that is applied. See also: Bitwise shift operator, Expression Cross-references: ECMA 262 edition 2 section 11.7 ECMA 262 edition 3 section 11.7 1926
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Error! No text of specified style in document. Refer to: Filter Shadow() Shallow copying (Definition) Copying object references and not the objects. See also: Array.toSource() Refer to: Copying objects Shared Property (Definition) A property contained in a prototype and shared between several instances. Availability: ECMAScript edition 2 You can create several objects and make them share a common ancestor. In a class-based object oriented world, this would be called sub-classing. Instantiating each one means it would inherit properties from its super-class, but objects of the same class in a real object oriented system do not share property values unless the static (class) factory method that instantiates them presets the same values as they are initialized. In JavaScript, because the prototype chain is used to inherit properties from parent objects and not parent classes, then objects will inherit property values unless they override them locally. If you are used to the class-based object oriented way of doing things, this can be quite distracting. Object prototype null A number object A number object An Object objectA string objectA string object String prototype Number prototype 1925
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Chapter number setTimeout() (Method) A method for setting a one shot timer. Availability: JavaScript 1.0 JScript 1.0 Internet Explorer 3.02 Netscape 2.0 Opera 3.0 Property/method value type: Number primitive -myWindow.setTimeout(aSourceText, aWaitTime)JavaScript syntax: -setTimeout(aSourceText, aWaitTime) aSourceText Some valid JavaScript source text Argument list: aWaitTime A delay in milliseconds See also: Timer events, Window.setInterval(), Window.setTimeout() setZOptions() (Method) Defines the window stacking behaviour. Availability: JavaScript 1.2 Netscape 4.0 Property/method value type: undefined N myWindow.setZOptions(anOptionValue)JavaScript syntax: N setZOptions(anOptionValue) Argument list: anOptionValue One of a range of possible settings for the feature Refer to: Window.setZOptions() Shadow() (Filter/visual) A visual filter for creating a shadow. Availability: JScript 3.0 Internet Explorer 4.0 1924
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Error! No text of specified style in document. setInterval() (Method) A method for setting timer intervals. Availability: JavaScript 1.2 JScript 3.0 Internet Explorer 4.0 Netscape 4.0 Property/method value type: Number primitive -myWindow.setInterval(aFunction, anInterval, someArguments) -myWindow.setInterval(aSourceText, anInterval) -setInterval(aFunction, anInterval, someArguments) JavaScript syntax: -setInterval(aSourceText, anInterval) aFunction A function object (not supported in MSIE) anInterval A time interval in milliseconds aSourceText Some valid JavaScript source text Argument list: someArguments The arguments to the function object (not supported in MSIE) See also: Timer events, Window.clearInterval(), Window.setTimeout(), Window.setInterval() setResizable() (Method) Enable or inhibit the window resize capability. Availability: JavaScript 1.2 Netscape 4.0 Property/method value type: undefined N myWindow.setResizable(aSwitch)JavaScript syntax: N setResizable(aSwitch) Argument list: aSwitch A Boolean value to control the functionality Refer to: Window.setResizable() 1923
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Chapter number Server-side JavaScript (Definition) That JavaScript which is executed in the web server, probably in response to a browser request and accessed via CGI. Server-side JavaScript is when the JavaScript source is executed in response to a request from a user’s client application. That request arrives as a server, which then determines that a JavaScript needs to be executed to build the response. The server then runs the script and returns the output of it to the user, most likely in the form of a web page but possibly in the form of some image data or other textual or binary content. Some server-side implementations are designed to yield performance improvements by semi- compiling the JavaScript and retaining that byte-code form in a cache. Each server may offer alternative ways to invoke the server-side scripting. It is hoped that all the servers that use JavaScript and which conform to ECMAScript may well use the same tags for enclosing the server-side script. However, since the tags are not defined in the standard, this may be a vain hope. Active Server Pages, CGI Driven JavaScript, Desktop JavaScript, Internet Information Server, LiveWire, Netscape Enterprise Server, Shell Scripting with JavaScript See also: Cross-references: Wrox Instant JavaScript page 3 Wrox Instant JavaScript page 5 Wrox Instant JavaScript page 64 Wrox Professional JavaScript page 59-90 setHotkeys() (Method) Activate or deactivate keyboard shortcuts for this window. JavaScript 1.2 Availability: Netscape 4.0 Property/method value type: JavaScript syntax: undefined myWindow.setHotKeys(aSwitch) N N setHotKeys(aSwitch) Argument list: A Boolean switch value aSwitch Refer to: Window.setHotkeys() 1922
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Error! No text of specified style in document. server.unlock() (Method) Relinquisesh a lock on the server object. Availability: JavaScript 1.1 Netscape Enterprise Server version 2.0 JavaScript syntax: NES server.unlock() If you ever lock the server object from a script, you should call this as soon as you possibly can after you have completed your lock critical code. Retaining a lock on your server object is not only bad manners but is seriously bad for the health and well-being of your server. Locking server objects persistently will hog resources and your server performance will slow to a crawl. See also: project.unlock() Server side browser detection (Useful tip) You can do a great deal of browser portability handling if you are prepared to serve browser specific pages from your web server. A wholly dynamic site may be able to serve browser, platform and version specific HTML according to the value of the userAgent string that the browser sends when it makes a request. This technique is fine for a few pages and when they don’t experience high traffic. To serve static pages this way needs a smarter server-side trick to be deployed. You could render very browser specific copies of your pages and store them under document path names that contain a component that could be derived by disassembling the userAgent string. Then in your web server, you can trap every request that needs this capability, route it through a special module and generate a browser-specific path modification. If you do this creatively, you could provide a mechanism that allows the web pages to request an unmodified URL but the web server serves a page that is as close to ideal as it can get. For example, the browser might be Netscape 3 on a Macintosh. That might yield a string containing a 3 for the version, an N for the browser and an M for the platform. The 3 might become a 4 or even a 6for other versions of Netscape Navigator. The N might become an E for MSIE, an I for iCab or an O for Opera. The M might become a W for windows. So we have a string that represents the browser, platform and version in three letters. We might get a string such as NM3, for example. When the browser requests a page called index.html, the web server would inspect the userAgent string and work out that its normalized signature is NM3. The web server can then attempt to serve the page NM3index.html. If this does not exist, the web server can fall back to NMindex.html and then Nindex.html before eventually serving just plain old index.html. These tests in the web server will take fractions of a second with something like a stat()function call to test for the existence of a file. With this technique, your publishing logic can generate some very platform, browser and version specific static files and the web server can locate them quickly and efficiently even when there are high traffic loads on the server farm. It s also workable for style sheets and can be deployed in a load- balanced multi-machine server farm as well. See also: Compatibility 1921
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Chapter number It is vitally important that you don’t hog a lock on the server object as this can deny server access to all other users The lock will stall if another script currently has a lock extant on this project. The method will then return when that lock is relinquished. Warnings: . Locking the server object can lead to severe performance degradation. While it is locked, any lock requests made by other scripts will stall pending the lock being relinquished with an unlock() method call. . You can render your server virtually useless by over-locking the server object. You should aim to relinquish any locks as soon as you possibly can. Ideally you should seek to avoid locking the server object if at all possible. See also: project.lock() server.port (Property) The port number that the server listens on for incoming requests. JavaScript 1.1 Number primitive Availability: Netscape Enterprise Server version 2.0 Property/method value type: JavaScript syntax: NES server.port This value is normally port number 80, but ports 81, 8080 or 8081 are also commonly used. It can be any port number you like although there are many reserved ports for other services on the host. On a Unix system, there is an /etc/servicesfile that will enumerate the ports that are likely to be reserved for other non web-server purposes. You may also have difficulty in using ports below number 1024 unless you have access to the system administrator account. server.protocol (Property) The protocol supported by the server is available from this property. JavaScript 1.1 String primitive Availability: Netscape Enterprise Server version 2.0 Property/method value type: JavaScript syntax: NES server.protocol Typical values for this property will be “http:” or “https:”. The latter will be used if the server is a secure server providing e-commerce support for example. 1920
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Error! No text of specified style in document. server.host (Property) The machine and domain name values for the server host. Availability: JavaScript 1.1 Netscape Enterprise Server version 2.0 Property/method value type: String primitive JavaScript syntax: NES server.host This value will be the DNS name that you can use to reach the server. You might use this value to manufacture URL values for use in HREF=”…” HTML tag attributes for example. See also: Netscape Enterprise Server, unwatch(), watch() server.hostname (Property) The hostname and port property of the receiving server object. JavaScript 1.1 String primitive server.hostname Availability: Netscape Enterprise Server version 2.0 Property/method value type: JavaScript syntax: This value will be the same as the host property if the port number the server listens on is 80. Otherwise, the port number will be appended to the host value and that will be the hostname value. A colon separator is introduced between the host and port values. NES See also: Netscape Enterprise Server server.lock() (Method) A means of locking the server object to prevent contention between scripts. Availability: JavaScript 1.1 Netscape Enterprise Server version 2.0 JavaScript syntax: NES server.lock() The server lock would be used at a higher hierarchical level than the project lock mechanism. 1919
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