StructKeyArray

Description

Finds the keys in a ColdFusion structure.

Returns

An array of keys; if structure does not exist, ColdFusion throws an exception.

Category

Structure functions

Function syntax

StructKeyArray(structure)

See also

Structure functions; Modifying a ColdFusion XML object in the Developing ColdFusion Applications

Parameters

Usage

A structure’s keys are unordered.

Example

<!--- Shows StructKeyArray function to copy keys from a structure to an array.  
    Uses StructNew to create structure and fills its fields with the 
    information the user enters in the form fields. ---> 
<h3>StructKeyArray Example</h3> 
<h3>Extracting the Keys from the Employee Structure</h3>     
<!-- Create structure. Check whether Submit was pressed. If so, define fields  
    in employee structure with user entries on form. -----> 
<cfset employee = StructNew()>  
<cfif Isdefined("Form.Submit")> 
    <cfif Form.Submit is "OK"> 
        <cfset employee.firstname = FORM.firstname> 
        <cfset employee.lastname = FORM.lastname> 
        <cfset employee.email = FORM.email> 
        <cfset employee.phone = FORM.phone> 
        <cfset employee.company = FORM.company>  
    <cfelseIf Form.Submit is "Clear"> 
        <cfset rc = StructClear(employee)> 
    </cfif> 
</cfif>     
<p> This example uses the StructNew function to create a structure called 
    "employee" that supplies employee info. Its fields are filled by  
    the form. After you enter employee information in structure, the  
    example uses StructKeyArray function to copy all of the keys from  
    the structure into an array. </p> 
<hr size = "2" color = "#0000A0"> 
<form action = "structkeyarray.cfm"> 
<table cellspacing = "2" cellpadding = "2" border = "0"> 
    <tr> 
    <td>First Name:</td> 
    <td><input name = "firstname" type = "text"  
        value = "" hspace = "30" maxlength = "30"></td> 
    </tr> 
    <tr> 
    <td>Last Name:</td> 
    <td><input name = "lastname" type = "text"  
        value = "" hspace = "30" maxlength = "30"></td> 
    </tr> 
    <tr> 
    <td>EMail</td> 
    <td><input name = "email" type = "text"  
        value = "" hspace = "30" maxlength = "30"></td> 
    </tr> 
    <tr> 
    <td>Phone:</td> 
    <td><input name = "phone" type = "text"  
        value = "" hspace = "20" maxlength = "20"></td> 
    </tr> 
    <tr> 
    <td>Company:</td> 
    <td><input name = "company" type = "text"  
        value = "" hspace = "30" maxlength = "30"></td> 
    </tr> 
    <tr> 
    <td><input type = "submit" name = "submit"  
        value = "OK"></td> 
    <td><b>After you submit the FORM, scroll down to see the array.</b> 
    </td> 
    </tr> 
</table> 
</form> 
<cfif NOT StructISEmpty(employee)>  
    <hr size = "2" color = "#0000A0"> 
    <cfset keysToStruct = StructKeyArray(employee)> 
    <cfloop index = "i" from = "1" to = "#ArrayLen(keysToStruct)#"> 
        <p><cfoutput>Key#i# is #keysToStruct[i]#</cfoutput></p> 
        <p><cfoutput>Value#i# is #employee[keysToStruct[i]]#</cfoutput> 
        </p> 
    </cfloop> 
</cfif>