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FilterFunctions

You can preprocess (filter) the posted field values using custom filters. A recipe script can define its own filter function and add it to the $FoxFilterFunctions array like this:

$FoxFilterFunctions['mycustomfilter'] = 'MyCustomFilterFunction';
function MyCustomFilterFunction($pagename, $fields) {
   ...process any field values here....
   return $fields;
}

Then a Fox form can call the filter function with parameter foxfilter=mycustomfilter or as a hidden input control of form (:input hidden foxfilter mycustomfilter :)

Fox will use a series of filters in the specified order if several filter function names are given, like

Additional examples of filters can be found in Cookbook:Fox-FilterExamples

If you do multi-page processing, or multi-target processing (like posting to different sections on a target page and using different templates for such), then sometime sit may be required that under certain input conditions a specific target process should be skipped, rather than the whole process be aborted. foxaction='skip' can be used for such. Use in a conditional loop to insert for the correct target. Example code snippet, which checks for a condition in foxtemplates

foreach($fx as $key => $val) {
......
    foreach ($fx[':foxtemplate'] as $i => $tmpl) {
              if (strstr($tmpl, $key)) 
                $fx[':foxaction'][$i] = "skip";
   ...........