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ASP Tutorial/Guide/HelpActive Server Pages (ASP) are Web pages that contain server-side scripts in addition to the usual mixture of text and HTML (Hypertext Markup Language) tags. Server-side scripts are special commands you put in Web pages that are processed before the pages are sent from your Personal Web Server to the Web browser of someone who's visiting your Web site. When you type a URL in the Address box or click a link on a Web page, you're asking a Web server on a computer somewhere to send a file to the Web browser (sometimes called a "client") on your computer. If that file is a normal HTML file, it looks exactly the same when your Web browser receives it as it did before the Web server sent it. After receiving the file, your Web browser displays its contents as a combination of text, images, and sounds.ASP is the future of the web. If you're looking for a way to create attractive, intelligent web pages or, if you're just looking for a way to extend your HTML know-how, then ASP is an effective way to achieve your goals. With ASP, you can customize your web pages to be more dynamic, more efficient and more responsive to your users. It's not just a technology, though ¡ª to get the best out of ASP, you'll be using it in tandem with HTML, and with one or more of the web's simple scripting languages. In the case of an Active Server Page, the process is similar, except there's an extra processing step that takes place just before the Web server sends the file. Before the Web server sends the Active Server Page to the Web browser, it runs all server-side scripts contained in the page. Some of these scripts display the current date, time, and other information. Others process information the user has just typed into a form, such as a page in the Web site's guestbook. To distinguish them from normal HTML pages, Active Server Pages are given the ".asp" extension. What Can You Do with Active Server Pages? There are many things you can do with Active Server Pages. You can display date, time, and other information in different ways. You can make a survey form and ask people who visit your site to fill it out, send emails, save the information to a file, etc. What Do Active Server Pages Look Like? The appearance of an Active Server Page depends on who or what is viewing it. To the Web browser that receives it, an Active Server Page looks just like a normal HTML page. If a visitor to your Web site views the source code of an Active Server Page, that's what they see: a normal HTML page. However, the file located in the server looks very different. In addition to text and HTML tags, you also see server-side scripts. This is what the Active Server Page looks like to the Web server before it is processed and sent in response to a request. The Active Server Pages (ASP) framework provides six built-in objects: The Active Server Pages(ASP) always works with Javascript and Vbscript and Html Language, Javascript and Vbscript are script languages. Application Object: You can use the Application object to share information among all users of a given application. An ASP-based application is defined as all the .asp files in a virtual directory and its subdirectories. Because the Application object can be shared by more than one user, there are Lock and Unlock methods to ensure that multiple users do not try to alter a property simultaneously. Syntax: Collections: Methods: Events: Example: Application.Lock Application("NumVisits") = Application("NumVisits") + 1 Application.Unlock ObjectContext Object: You can use the ObjectContext object to either commit or abort a transaction, managed by Microsoft Transaction Server (MTS), that has been initiated by a script contained in an ASP page. Syntax: Methods: Events: Request Object: The Request object retrieves the values that the client browser passed to the server during an HTTP request. Syntax: Collections: Properties: Methods: Response Object: You can use the Response object to send output to the client. Syntax: Collections: Properties: Methods: Server Object: The Server object provides access to methods and properties on the server. Most of these methods and properties serve as utility functions. Syntax: Properties: Methods: Session Object: You can use the Session object to store information needed for a particular user-session. Variables stored in the Session object are not discarded when the user jumps between pages in the application; instead, these variables persist for the entire user-session. The Web server automatically creates a Session object when a Web page from the application is requested by a user who does not already have a session. The server destroys the Session object when the session expires or is abandoned. Syntax: Collections: Properties: Methods: Events: About Javascript Language: About Vbscript Language: What is Javascript? JavaScript is Netscape's cross-platform, object-based scripting language for client and server applications. There are two types of JavaScript: JavaScript in Navigator: Netscape Navigator 2.0 (and later versions) can interpret JavaScript statements embedded in an HTML page. When Navigator requests such a page, the server sends the full content of the document, including HTML and JavaScript statements, over the network to the client. The Navigator then displays the HTML and executes the JavaScript, producing the results that the user sees. This process is illustrated in the following figure. Client-side JavaScript statements embedded in an HTML page can respond to user events such as mouse-clicks, form input, and page navigation. For example, you can write a JavaScript function to verify that users enter valid information into a form requesting a telephone number or zip code. Without any network transmission, the HTML page with embedded JavaScript can check the entered data and alert the user with a dialog box if the input is invalid. JavaScript in LiveWire: LiveWire is an application development environment that uses JavaScript for creating server-based applications similar to CGI (Common Gateway Interface) programs. In contrast to Navigator JavaScript, LiveWire JavaScript applications are compiled into bytecode executable files. These application executables are run in concert with a Netscape server (version 2.0 and later) that contains the LiveWire server extension. The LiveWire server extension generates HTML dynamically; this HTML (which may also include client-side JavaScript statements) is then sent by the server over the network to the Navigator client, which displays the results. JavaScript, the language: As described in the previous sections, client and server JavaScript differ in numerous ways, but they have the following elements in common: Javascript Object: Each object topic indicates whether the object is part of the client (in Navigator), server (in LiveWire), or is common (built-in to JavaScript). Server objects are not included in this version of the documentation. The following objects are available in JavaScript: Javascript Object Property: The following objects Property are available in JavaScript: Javascript Method: The following Methods are available in JavaScript: Javascript Event Handler: The following Event Handler are available in JavaScript: Javascript Syntax: JavaScript statements consist of keywords used with the appropriate syntax. A single statement may span multiple lines. Multiple statements may occur on a single line if each statement is separated by a semi-colon. Syntax conventions: All keywords in syntax statements are in bold. Words in italics represent user-defined names or statements. Any portions enclosed in square brackets, i.e. [ and ], are optional. {statements} indicates a block of statements, which can consist of a single statement or multiple statements delimited by a curly braces. The following statements are available in JavaScript: Javascript Reservation Keywords: The following Keywords can't be use as variable or function name or object name in javascript language: What is Vbscript?: VBScript (short form of Visual Basic Script Edition) is an Active Scripting engine bundled with Microsoft Windows. It uses a dialect of Visual Basic (essentially a subset of VB language with a few added features). VBScript can be used in Internet Explorer, Active Server Pages and Windows Script Host as a general-purpose scripting language. It is often used in conjunction with Windows Script Host as a replacement for batch files. VBScript is interpreted by a script engine vbscript.dll, which can be invoked by ASP engine asp.dll in a web environment, wscript.exe in a Windows GUI environment, and cscript.exe in a command-line environment. When VBScript source code is contained in stand-alone files, they typically have the file extension .vbs. When employed in Internet Explorer, VBScript is very similar in function to JavaScript ¨C- it processes code embedded in HTML. Both VBScript and JScript can be also used to create stand-alone HTA applications, which require IE to be run. However, many webmasters prefer to use JavaScript instead for better compatibility with alternative web browsers. VBScript is also the language some notable e-mail worms, such as ILOVEYOU, were written in. There are several reasons for this: first, funny scroll-like icon of VBS files, so that users with little Windows experience may think it's a text file; second, possibility of writing a basic e-mail worm in VBS in just a few lines of code. Microsoft has since fixed the security holes that such worms exploited, so now they came to their demise. Easy to Use and Learn: If you already know Visual Basic or Visual Basic for Applications (VBA), VBScript will be very familiar. Even if you do not know Visual Basic, once you learn VBScript, you are on your way to programming with the whole family of Visual Basic languages. Although you can learn about VBScript in just these few Web pages, they do not teach you how to program. To learn programming, take a look at Step by Step books available from Microsoft Press. Windows Script: VBScript talks to host applications using Windows Script. With Windows Script, browsers and other host applications do not require special integration code for each scripting component. Windows Script enables a host to compile scripts, obtain and call entry points, and manage the namespace available to the developer. With Windows Script, language vendors can create standard language run times for scripting. Microsoft will provide run-time support for VBScript. Microsoft is working with various Internet groups to define the Windows Script standard so that scripting engines can be interchangeable. Windows Script is used in Microsoft Internet Explorer and in Microsoft Internet Information Service. VBScript in Other Applications and Browsers: As a developer, you can license VBScript source implementation at no charge for use in your products. Microsoft provides binary implementations of VBScript for the 32-bit Windows API, the 16-bit Windows API, and the Macintosh. VBScript is integrated with World Wide Web browsers. VBScript and Windows Script can also be used as a general scripting language in other applications. VBScript Functions: Date/Time functions: Math functions: String functions: Conversion functions: Array functions: Format functions: Other functions: VBScript Constants: VBScript Errors: VBScript Events: VBScript Keywords: VBScript Methods: VBScript Objects and Collections: VBScript Operators: VBScript Properties: VBScript Statements: The above information has been provided as a reference only. Directron.com is not responsible for any damage or problem caused as a result of correctly or incorrectly following the instructions outlined therein. Related Articles: | HTML Tutorial/Guide/Help | Last Updated: Sept. 8, 2005 (c) Directron.com, All rights reserved If you find this article useful, please create a link to it from your website or tell a friend about it. If you have any comments or suggestions about this article, please email information@directron.us
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