CFSWITCH | |
Description
Evaluates a passed expression and passes control to the cfcase tag that matches the expression result. You can, optionally, code a cfdefaultcase tag, which receives control if there is no matching cfcase tag value. |
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Category
Flow-control tags | |
Syntax<cfswitch expression = "expression"> <cfcase value = "value" delimiters = "delimiters"> HTML and CFML tags </cfcase> additional <cfcase></cfcase> tags <cfdefaultcase> HTML and CFML tags </cfdefaultcase> </cfswitch> | |
See also
cfabort, cfloop, cfbreak, cfrethrow, cfexecute, cfexit, cfthrow, cfif, cftry, cflocation |
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History
New in ColdFusion MX: you can put the cfdefaultcase tag at any position within a cfswitch statement; it is not required to be the last item.
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Usage
This tag requires an end tag. All code within this tag must be within a cfcase or cfdefaultcase tag. Otherwise, ColdFusion throws an error. Use this tag followed by one or more cfcase tags. Optionally, include a cfdefaultcase tag. This tag selects the matching alternative from the cfcase and cfdefaultcase tags, jumps to the matching tag, and executes the code between the cfcase start and end tags. You do not have to explicitly break out of the cfcase tag, as you do in some languages. You can specify only one cfdefaultcase tag within a cfswitch tag. You can put the cfdefaultcase tag at any position within a cfswitch statement; it is not required to be the last item. For example: <cfset foo=1> <cfswitch expression="#foo#"> <cfdefaultcase> <cfset fooMore= #foo# + 1> </cfdefaultcase> <cfcase value="2"> <cfset fooMore = #foo# + 2> </cfcase> </cfswitch> <cfdump var=#fooMore#> The cfswitch tag provides better performance than a series of cfif/cfelseif tags, and the code is easier to read. |
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Example cfcase to exercise a case statement in CFML ---> <cfquery name = "GetEmployees" dataSource = "cfsnippets"> SELECT Emp_ID, FirstName, LastName, EMail, Phone, Department FROM Employees </cfquery> <h3>cfswitch Example</h3> <!--- By outputting the query and using cfswitch, we classify the output without using a cfloop construct. ---> <p>Each time the case is fulfilled, the specific information is printed; if the case is not fulfilled, the default case is output </p> <cfoutput query="GetEmployees"> <cfswitch expression="#Trim(Department)#"> <cfcase value="Sales"> #FirstName# #LastName# is in <b>sales</b><br><br> </cfcase> <cfcase value="Accounting"> #FirstName# #LastName# is in <b>accounting</b><br><br> </cfcase> <cfcase value="Administration"> #FirstName# #LastName# is in <b>administration</b><br><br> </cfcase> <cfdefaultcase> #FirstName# #LastName# is not in Sales, Accounting, or Administration.<br><br> </cfdefaultcase> </cfswitch> </cfoutput> |
EXPRESSION | |
Required | |
ColdFusion expression that yields a scalar value. ColdFusion converts integers, real numbers, Booleans, and dates to numeric values. For example, True, 1, and 1.0 are all equal. |
VALUE | |
Required | |
One or more constant values that cfswitch compares to the expression (case-insensitive). If a value matches expression, cfswitch executes the code between cfcase start and end tags. Duplicate value attributes cause a runtime error. |
DELIMITERS | |
Optional | |
Default value: ", (comma)"
Character that separates entries in a list of values. |