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<HTML> <BODY>
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The Response Object
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You've already seen a quick example of the Response object and its most important method: Write The Response object is used to output information to the client Web browser, including text, cookies, HTML headers, and more In an administrative script, you're not likely to use much more than ResponseWrite, and it's one of the two additional commands that I mentioned you'd have to learn
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Writing Output
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ResponseWrite simply outputs text to the Web page Think of it as a sort of MsgBox statement, or more accurately a WScriptEcho for Web pages As you've seen, you can include functions and literal text, and ResponseWrite simply outputs whatever you tell it to Here's another example of how ResponseWrite works Save this page as Responseasp in your computer's Web root folder, and access it via http://localhost/responseasp
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ResponseWrite Now & "<br><br>" ResponseWrite "Hello!" & "<br><br>" ResponseWrite "All done!"
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Use View Source in your Web browser to see the final HTML that was transmitted to the browser TIP The <br> tags I use in this example are HTML tags for a line break They're similar to using vbCrLf in a regular script, and tell the Web browser to insert a carriage return and linefeed Use two of them in a row, as I've done, to create blank lines Using vbCrLf doesn't work in an ASP script, because Web browsers tend to ignore incoming carriage returns and linefeeds when they display HTML
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Saving Cookies
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The Response object also allows you to save cookies to client computers A cookie is a small collection of data, normally smaller than 1024 bytes in size A cookie is a collection of crumbs (seriously), with each crumb representing one piece of data So, if you want to save the user's name, that would be one crumb in the cookie, the user's last logon date might be another In administrative scripts, cookies tend to have limited use One potential use is in a Web-based wizard, such as a new user creation wizard In that application, you might use a cookie to keep track of the settings the user enters on each page of the wizard; on the last page, you could then collect all that data together to create the new user account Response provides access to cookies through the ResponseCookies collection It's simple to use; here's an example of setting two crumbs
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ResponseCookies("UserName") = "JohnD" ResponseCookies("AcctExpires") = 0
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The trick with cookies is that they have to be passed in the HTTP headers, not in the main HTML code That means you have to set the cookies before any HTML is output to the browser The following example works fine
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The Request Object
If the Response object provides a means of producing output, you might suspect that the Request object allows you to work with user input and you'd be right Primarily, the Request object lets you access cookies, and lets you access information entered into HTML forms
HTML Forms
Whenever you add an HTML form field to a Web page, you give it a name For example, <INPUT TYPE="TEXT" NAME="ComputerName"> creates a text box named "ComputerName" When that form is submitted back to the Web browser (when the user clicks a Submit button), whatever the user entered is paired with the form field name to make it more readily accessible to you ASP exposes form fields through its Forms collection You can use these just like read-only variables, as shown in this snippet
The computer name you entered was: <% ResponseWrite RequestForms("ComputerName") %>
Any fields not filled in by the user will be blank, and equal to "" You can use RequestForms in logical comparisons, to produce additional output (as in the preceding example), and so forth You'll see plenty of the Request object in the full-length sample later in this chapter TIP As a shortcut, you can omit Forms when reading forms input For example, instead of typing RequestForms("ComputerName"), you could simply type Request("ComputerName") and get the same results I'll use that technique in most of my examples to save space