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About ASP
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ASP was first introduced with Internet Information Server 30 (IIS 30), and exists in subsequent versions of IIS It's important that you make a distinction between ASP and ASPNET ASP is Microsoft's original server-side scripting model, whereas ASPNET is a completely new, NET Framework-based technology that has nothing to do with scripting at all IIS 50 and 60 support ASPNET, and both of them support running both ASP and ASPNET applications within the same Web site Although ASPNET is a powerful, high performance way to write Web applications, it's a bit outside the scope of administrative scripting For instance, it doesn't use VBScript; so-called "Classic" ASP does So, for the purposes of this book, I'll focus on the older ASP technology ASP is not a programming language, although that is a popular misconception ASP is simply a specialized object model and a specialized host for VBScript The ASP object model allows you to access information that users type into HTML input forms, and allows you to write output to HTML pages In fact, ASP isn't particularly high-tech or fancy (although it was pretty innovative when it was introduced) To get started with ASP, consider a basic HTML Web page
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<HTML> <BODY> <FORM ACTION="displayasp" METHOD="POST"> Computer name: <INPUT TYPE="TEXT" NAME="COMPUTERNAME"><BR> <INPUT TYPE="SUBMIT"> </FORM> </BODY> </HTML>
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Type this HTML code into Notepad and save the file as Displayasp The file needs to be located within an IIS folder, such as C:\Inetpub\Wwwroot If you've got the file in the correct place, you should be able to select Run from the Start menu, type http://localhost/displayasp, and see a small Web page that says "Computer name:" and has a text box and a Submit button Is this ASP Not really This is just HTML the Web page doesn't actually do anything if you click the Submit button You could create a page like this with any HTML editor, such as Microsoft FrontPage In fact, I usually use FrontPage to work with ASP You can also use higher-end script editors like PrimalScript, because they understand both ASP tags and HTML code
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Getting Ready for Web Scripting
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For this chapter and the three that follow, I'm going to assume your computer is set up to run ASP pages You'll need a Windows 2000, Windows Server 2003, or Windows XP computer with IIS installed You'll also need to ensure that ASP is enabled; this is the default for Windows 2000 and Windows XP, but you'll have to explicitly enable ASP in Windows Server 2003 You should also know where the IIS root folder is Generally, that's in C:\Inetpub\Wwwroot; you can check the properties of the Default Web Site in the Internet Services Manager console to see where the root folder is located on your computer I'll have you place all of the sample Web pages in that root
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VBScript in ASP
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Where's the scripting in ASP You have to add it Essentially, the same ASP page has a mix of both VBScript code and HTML code The VBScript code has to be added between two special tags: <% and %> These tags tell IIS where the script code begins and ends, and allows it to distinguish between VBScript and HTML Consider the following revision to our running example
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<HTML> <BODY> <% ResponseWrite("It is now " & Now) %> <FORM ACTION="displayasp" METHOD="POST"> Computer name: <INPUT TYPE="TEXT" NAME="COMPUTERNAME"><BR> <INPUT TYPE="SUBMIT"> </FORM> </BODY> </HTML>
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Believe it or not, that's a full ASP page The key is in the VBScript line ResponseWrite("It is now " & Now), which is a line of VBScript that uses ASP's built-in Response object to output the current date and time to the Web page Try running that remember, save the page in an IIS folder and access the page by using your Web browser and the HTTP protocol and you'll see what it looks like Here's how it works: When you request the file from the Web server, IIS locates the appropriate file on the hard drive It loads the file into memory, and because the file has an ASP filename extension, IIS hands it off to Aspdll, which is an ISAPI plug-in that handles ASP pages Aspdll scans each line of the file The first two lines obviously aren't code, because Aspdll hasn't seen a <% tag; therefore, those lines are passed straight through to IIS, and IIS transmits them to your Web browser On the third line, ASP realizes that some script code is beginning Aspdll reads the fourth line, and executes it The results of the code execution are passed to IIS and transmitted to your Web browser On the fifth line of the file, Aspdll stops looking for code and continues passing everything straight through to IIS TIP If you're feeling lazy, you don't have to type out ResponseWrite; you can simply use the equal sign <% = "Hello" %> is functionally the same as <% ResponseWrite "Hello" %>
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If you've loaded this page into your Web browser, right-click the page and select View Source from the context menu (assuming you're using Internet Explorer, of course) You should see something like this
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