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see the main content of the page but not the included file However, Dreamweaver s Design view approximates what the composite page will look like, server-side includes and all To add a server-side include to your page, choose Insert | Script Objects | ServerSide Include or look under the Script tab of the Insert panel and click the Server-Side Include button The Select File dialog box appears Navigate to the HTML code snippet that you want to include and double-click it Dreamweaver displays the included code in the document window, as Figure 5-8 shows The instructions to the Web server appear in the source code between comment notations like this:

A variable represents or holds a value The actual value of a variable can be changed at any time To understand what a variable is, consider a basic statement that you may recall from algebra class:

When you click the included file in the document window, the Properties panel gives you a few options for modifying the server instructions, as shown in the following

The letter x is used as the name of the variable It is assigned a value of 2 To change the value, you simply give x a new assignment:

12

FIGURE 5-8

The name of the variable stays the same, but now it represents a different value Taking the math class example one step further, you probably had to solve a problem like this one:

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To get the answer, you put the value of 2 in place of the variable x in the problem, for 3+2=5 If the value of x changes, so does the answer to the problem So, if x=7, then the calculation turns into 3+7, and now the result is 10

5:

Variables in JavaScript are much like those used in mathematics You give a variable a name, and then assign it values based on your needs If the value of the variable changes, it will change something that happens within the script

illustration Change the source file to include by browsing for a new file If your Web server is an Apache server, select the Virtual type on the Properties panel If your Web server isn t Apache, chose Virtual, but test your page as soon as possible If the include doesn t behave correctly (as it probably won t on a Microsoft IIS, or Information Internet Server), switch the type to File If the include still doesn t behave correctly, contact your network administrator to troubleshoot the problem It may be that the server needs some special configuration

Using variables offers several benefits:

They can be used in places where the value they represent is unknown when the code is written They can save you time in writing and updating your scripts They can make the purpose of your code clearer

Now that you ve explored several types of assets, the quick reference in the next Scenario and Solution will help you keep straight the various HTML tags and notations that Dreamweaver uses to reference the assets

Oftentimes, a variable will hold a place in memory for a value that is unknown at the time the script is written A variable value might change based on something entered by the viewer or may be changed by you later in the script code For instance, you might have a function that takes in certain values based on user input (functions will be discussed in 4) Since the value of user input is unknown at the time the script is written, a variable can be used to hold the value that will be input by the user This is true for any sort of user input, whether it be in the form of a JavaScript prompt/confirm box, input fields in a form, or other methods of input

What tag does Dreamweaver use to reference images What tags does Dreamweaver use to reference media files What tag does Dreamweaver use to reference ActiveX controls What tag does Dreamweaver use to reference Java applets What tag does Dreamweaver use to reference scripts What notation does Dreamweaver use to indicate a server-side include

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