Add AJAX_CALL_UNKNOWN event

Allows action plugins to support custom ajax calls.
The event data is the call name from $_POST['call'].
When handling a custom ajax call, remember to use
$event->preventDefault();
to avoid having the
'AJAX call <call> unknown!'
message appended to the output.

darcs-hash:20060809194501-05dcb-0082e4f2a83fc8657fc7cdcf32d44aac8d1a6b99.gz

lib/exe/ajax.php

@@ -23,11 +23,18 @@ header('Content-Type: text/html; charset=utf-8');
 
 
 //call the requested function
+if (!isset($_POST['call'])) { return; }
 $call = 'ajax_'.$_POST['call'];
 if(function_exists($call)){
   $call();
 }else{
-  print "The called function '".htmlspecialchars($call)."' does not exist!";
+  $call = $_POST['call'];
+  $evt = new Doku_Event('AJAX_CALL_UNKNOWN', $call);
+  if ($evt->advise_before()) {
+    print "AJAX call '".htmlspecialchars($_POST['call'])."' unknown!\n";
+  }
+  $evt->advise_after();
+  unset($evt);
 }
 
 /**