You can use ActionScript in the following attribute of tags in CFML Flash format forms:

• Form and control events, such as the onSubmit attribute of the cfform tag, or the onChange and onClick attributes of the cfinput tag. The attribute description on the tag reference pages in the CFML Reference list the event attributes.
• Bind expressions, which you can use to set field values. For more information on binding data, see Binding data in Flash forms.

Your ActionScript code can be inline in the form attribute specification, you can make a call to a custom function that you define, or you can use the ActionScript include command in the attribute specification to get the ActionScript from a .as file.

The following example shows a simple Fahrenheit to Celsius converter that does the conversion directly on the client, without requiring the user to submit a form to the ColdFusion server.

<cfform format="flash" width="200" height="150">
    <cfinput type="text" name="fahrenheit" label="Fahrenheit" width="100"
        value="68">
    <cfinput type="text" name="celsius" label="Celsius" width="100">
    <cfinput type="button" name="convert" value="Convert" width="100"
        onClick="celsius.text = Math.round((farenheit.text-32)/1.8*10)/10">
</cfform>