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dhtmlx connector $action->invalid();

how to show the error message on the client side if the server-side = " $action->invalid();"

thx

You can use 

on server side
      $action->set_response_text(" error message text here ");
      $action->invalid();


on client side, add next line to dataprocessor init

     dp.defineAction("invalid",function(tag){  //tag - XML tag which contains error details
          var text = tag.firstChild?tag.firstChild.data:"";
          if (text) alert(text);
          return true;
     })


Instead of text, in above scenario, set_response_attribute can be used, it will made access data on client side is less cryptic, but it has limitation on content.

Some more info can be obtained from
http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Dataprocesor_usage.html#grid_art_dataprocessor
"Custom server side responses" section