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USING DREAMWEAVER

Making pages dynamic

Last updated 3/28/2012

You can create the code blocks either directly in the Server Behavior Builder, or you can copy and paste the code from

other sources. Each code block you create in the Server Behavior Builder must be a single tag or script block. If you

must insert multiple tag blocks, split them into separate code blocks.

Conditions in code blocks

Dreamweaver lets you develop code blocks that incorporate control statements that execute conditionally. The Server

Behavior Builder uses

if, elseif, and else statements, and may also contain server behavior parameters. This

enables you to insert alternate text blocks based on the values of OR relationships among server behavior parameters.

The following example shows the if, elseif, and else statements. The square brackets ([ ]) denote optional code and

the asterisk (*) denotes zero or more instances. To execute a portion of a code block or the entire code block only if a

certain condition or conditions apply, use the following syntax:

<@ if (expression1) @>conditional text1[<@ elseif (expression2) @>conditional text2]*[<@ else

conditional text3]<@ endif @>

Condition expressions can be any JavaScript expression that can be evaluated using the JavaScript eval() function,

and may include a server behavior parameter marked by @@’s. (The @@’s distinguish the parameter from JavaScript

variables and keywords.)

Effectively using conditional expressions

When using if, else, and elseif directives within the insertText XML tag, the participant text is preprocessed to

resolve the

if directives and to determine which text to include in the result. The if and elseif directives take the

expression as an argument. The condition expression is the same as that for JavaScript condition expressions, and can

also contain server behavior parameters. Directives such as this allow you to choose between alternative code blocks

based on the values of, or relationships between, server behavior parameters.

For example, the following JSP code comes from a Dreamweaver server behavior that uses a conditional code block:

@@rsName@@.close();

<@ if (@@callableName@@ != '') @>

@@callableName@@.execute();

@@rsName@@ = @@callableName@@.getResultSet();<@ else @>

@@rsName@@ = Statement@@rsName@@.executeQuery();

<@ endif @>

@@rsName@@_hasData = @@rsName@@.next();

The conditional code block starts with <@ if (@@callableName@@ != '')

@> and ends with <@ endif @>. According to the code, if the user enters a value for the @@callableName@@ parameter

in the server behavior's Parameter dialog box—in other words, if the

@@callableName@@ parameter value is not null,

(@@callableName@@ != '')—then the conditional code block is replaced with the following statements:

@@callableName@@.execute();

@@rsName@@ = @@callableName@@.getResultSet();

Otherwise, the code block is replaced with the following statement:

@@rsName@@ = Statement@@rsName@@.executeQuery();