Creating Web Sites Before ASP.NET

王朝asp·作者佚名  2006-01-10
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Creating Web Sites Before ASP.NET

Before ASP.NET, developers using Microsoft products had two paths they could

take: Developers could either create simple HTML pages or they could use

Active Server Pages (ASP). Obviously, there were other choices as well,

including several techniques superceded by ASP. The next two sections

outline the two existing techniques for creating Web applications.

Using HTML to Create Sites

You can create a Web site using nothing but HTML if you want. However, when

you do this, you do not have the ability to provide any runtime

customization. For example, suppose you have a product catalog. If you wish

to add or delete items from the catalog, you have to go into the HTML page

that has the products and manually add and delete these products. This can

be quite laborious.

The following page, Page1.htm, provides simple support for submitting data

to another page using a submit button:

<HTML>

<BODY>

<H3>Enter Login Information</H3>

<form action="Process.htm" method="post">

Login ID <input type="textbox" value="BJones" name="txtLoginID"><br>

Password <input type="password" name="txtPassword"><BR>

<input type="submit" value="Login" name="btnLogin">

</FORM>

</BODY>

<HTML>

This page contains a Form element, which in turn contains all the data you

might want to post to a page on your Web server. In this case, when you

click Submit, you'll navigate to a page named Process.htm (which doesn't

exist, in this little example). This page would need to somehow retrieve

the values sent to it via the HTTP request. Luckily, you won't need to use

this technique.

Using ASP

Microsoft realized the limitations of creating active Web sites using HTML

and created Active Server Pages (ASP). (Microsoft wasn't alone in this梩here

are other, competing technologies, as well, that provide similar

functionality.) This technology allowed some script to run on the server,

and the final output of this script was HTML. That is, the request to the

page would cause script code to run, which in turn could render HTML for

display in any browser. For example, the script could retrieve data from a

table in a database and generate a product catalog dynamically.

The following page, Page1.asp, demonstrates how ASP applications might

appear. Notice the mixture of HTML and script code梩hat was the nature of

the ASP beast. If you want to run this page, you'll need to set up a

virtual root in IIS, load the page into that folder, and then browse to the

server from within a browser. (In other words, you can't simply

double-click ASP pages and view them in a browser梩hey require processing

by IIS in order to render their output.) Here's the code for the page:

<%

Dim strLogin

Dim strPassword

' First time through, no data

strLogin = Request("txtLoginID")

strPassword = Request("txtPassword")

%>

<HTML>

<BODY>

<H3>Enter Login Information</H3>

<FORM action="Page1.asp" method="POST">

Login ID <input type="textbox" value="" name="txtLoginID"><br>

Password <input type="password" value="" name="txtPassword"><BR>

<input type="submit" value="Login" name="btnLogin">

<div><p><%= strLogin %> - <%= strPassword %></div>

</FORM>

</BODY>

<HTML>

 
 
 
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