Adobe 38040334 Extending Dreamweaver - Page 289
Updating server behaviors
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DREAMWEAVER CS3 283 Extending Dreamweaver In resolving a searchPatterns tag, Dreamweaver uses the following algorithm: 1 Look for the whereToSearch attribute within the searchPatterns tag. 2 If the attribute value starts with tag+, the remaining string is assumed to be the tag name (no spaces are allowed in the tag name). 3 Look for the limitSearch attribute within the searchPattern tag. 4 If the attribute value starts with attribute+, the remaining string is assumed to be the attribute name (no spaces are allowed in the attribute name). If these four steps are successful, Dreamweaver assumes a tag/attribute combination. Otherwise, Dreamweaver starts looking for searchPattern tags with a paramName attribute that has a _url suffix and a regular expression that is defined. (For information about regular expressions, see "Regular expressions" on page 255.) The following example of a searchPatterns tag has no search pattern because it combines a tag (cfinclude) with an attribute (template) to isolate the URL for dependency file checking, path fixing, and so forth: The tag/attribute combination (see the previous example) does not apply to translation because Dreamweaver always translates to straight text in the JavaScript layer. File dependency checking, path fixing, and so on occurs in the C layer. In the C layer, Dreamweaver internally splits the document into directives (straight text) and tags (parsed into an efficient tree structure). Updating server behaviors Replacement update By default, participant EDML files do not have an tag, and instances of the participant are updated in the document by replacing them entirely. When a user edits an existing server behavior and clicks OK, any participant that contains a parameter whose value has changed is removed and reinserted with the new value in the same location. If the user customizes participant code in the document, the participant might not be recognized if the search patterns look for the old code. Shorter search patterns can let the user customize the participant code in their document; however, updating the server behavior instance can cause the participant to be replaced, which loses the custom edits. Precision update In some cases, it can be desirable to let users customize the participant code after it is inserted in the document. This situation can be achieved by limiting the search patterns and providing update patterns in the EDML file. After you add the participant to the page, the server behavior updates only specific parts of it. The following example shows a simple participant with two parameters: This example might use the following search patterns: Response.Write /if\s*\((\w+)\.EOF\)\s*Response\.Redirect\("([^\r\n]*)"\)/i The user might add another test to a particular instance of this code, as shown in the following example: 2) Response.Redirect("some_url_here") %>
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