Part III The ColdFusion MX Language in Java

Render QR Code ISO/IEC18004 in Java Part III The ColdFusion MX Language
Part III The ColdFusion MX Language
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But that s not all! Now that you re closing the subtags, all of them run twice. Now you must move all the code in OutputColumn.cfm into a CFIF test, as shown in Listing 18-16.
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Listing 18-16: OutputColumn.cfm, taking into account the dual execution due to the shorthand closing syntax
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<cfparam name= Attributes.ColumnName > <cfparam name= Attributes.Label default= #Attributes.ColumnName# > <cfif ThisTag.ExecutionMode EQ End > <cfassociate basetag= CF_OUTPUTTABLE > <cfset ParentData = GetBaseTagData( CF_OUTPUTTABLE )> <cfoutput> <td bgcolor= #ParentData.Attributes.HeaderRowColor# > <b>#Attributes.ColumnName#</b> </td> </cfoutput> </cfif>
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Using CFMODULE to call your custom tags may seem a lot of extra work, but in the long run, the increase in execution speed is well worth it.
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Using the Request Scope
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Variables within custom tags exist in their own variable space, and the only way to share data back and forth between the calling page and the custom tag is by using the Attributes and Caller scopes. Request variables are available to all templates in a request, including custom tags, and are the best way to give custom tags access to global variables such as Request.MainDSN, Request.Username, and Request.Password. You should generally restrict your use of Request-scope variables in your custom tags to global constants such as these. All other data needed by a custom tag should be passed to it via attributes.
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Recursively Calling a Custom Tag
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As can functions, custom tags can be called recursively. This is rare, however, and usually on an advanced scale, because recursion in custom tags is used differently than in user-defined functions. Because UDFs are more suited to making calculations, you find more numeric recursion in UDFs. On the other hand, recursion in custom tags is best suited for such procedures as recursing over structures or directory hierarchies, where the purpose is page output rather than returning single results from each recursive call.
18 Writing Custom Tags
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Listing 18-17 shows a custom tag that takes a directory path and returns a listing of all the files and subfolders of that path. It uses recursion to list the contents of subdirectories as well.
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Listing 18-17: ListDir.cfm
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<cfparam name= Attributes.Directory > <cfoutput> #Attributes.Directory#\<br> </cfoutput> <cfdirectory action= LIST directory= #Attributes.Directory# name= GetFiles > <cfloop query= GetFiles > <cfif GetFiles.Type EQ Dir > <cfif GetFiles.Name NEQ . AND GetFiles.Name NEQ .. > <cf_ListDir directory= #Attributes.Directory#\#GetFiles.Name# > </cfif> <cfelse> <cfoutput> #Attributes.Directory#\#GetFiles.Name#<br> </cfoutput> </cfif> </cfloop>
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The CFIF test for GetFiles.Name NEQ . AND GetFiles.Name NEQ .. is not necessary in ColdFusion MX, because MX no longer returns these values. We kept the test in this listing for backward compatibility with ColdFusion 5. ListDir.cfm uses CFDIRECTORY to get all of the files and subfolders of the directory passed to the tag. It then loops over the list of files and directories and outputs every file that it finds. Whenever the loop encounters a directory, ListDir.cfm calls itself recursively, passing the name of the new directory. We called ListDir.cfm on our systems by using the following: <cf_ListDir Directory= C:\inetpub\wwwroot\BibleExample >
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Calling this tag produces what s shown in Figure 18-7.
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Part III The ColdFusion MX Language
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Figure 18-7: Results of calling ListDir.cfm.
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Exiting a Tag Before It is Finished
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13 mentions CFABORT as a way to immediately stop a request s execution. Inside a custom tag, you rarely want to end an entire request, but you may want to end the execution of the tag and return to the calling page. A call to CFEXIT looks as follows:
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<cfexit method= ExitTag >
You have the following three possible values for method: ExitTag: Resumes execution after the closing tag. ExitTemplate: Resumes execution after either the opening or closing tag, depending on where it s called. Loop: Re-executes the body of the custom tag.
Using the ExitTag method
ExitTag stops the current tag, meaning that execution continues after the closing tag (or the
opening tag if you have no closing tag). Listings 18-18 and 18-19 show a custom tag and its calling page.
Listing 18-18: MyTagCall.cfm
<cf_MyTag> This is the tag content. </cf_MyTag> This is content after the closing tag.
18 Writing Custom Tags
Listing 18-19: MyTag.cfm
<cfif ThisTag.ExecutionMode EQ Start > This is the opening tag content. <cfexit method= ExitTag > This is content after the CFEXIT call. <cfelse> This is the closing tag content. </cfif>
Running MyTagCall.cfm produces the following: