Evaluate

Description

Evaluates one or more string expressions, dynamically, from left to right. (The results of an evaluation on the left can have meaning in an expression to the right.) Returns the result of evaluating the rightmost expression.

Return value

An object; the result of the evaluation(s).

Syntax

Evaluate(string_expression1 [, string_expression2 [, ... ] ] )

Parameters

Parameter Description

string_expression1, string_expression2...
Expressions to evaluate

Parameter	Description
string_expression1, string_expression2...	Expressions to evaluate

Usage

String expressions can be complex. If a string expression contains a single or double quotation mark, it must be escaped.

This function is useful for forming one variable from multiple variables. For example, to reference a column of the query qNames with a variable, var, using an index value to traverse rows, you could use the following code:

<cfset var=Evaluate("qNames.#colname#[#index#]")>

For more information, see Developing ColdFusion MX Applications with CFML.

Example

<!--- This shows the use of DE and Evaluate --->
<h3>Evaluate Example</h3>
<cfif IsDefined("FORM.myExpression")>
<h3>The Expression Result</h3>
<cftry>
<!--- Evaluate the expression --->
<cfset myExpression = Evaluate(FORM.myExpression)>
<!--- Use DE to output the value of the variable, unevaluated --->
<cfoutput>
<I>The value of the expression #Evaluate(DE(FORM.MyExpression))#
is #MyExpression#.</I>
</cfoutput>
...