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Display server error message during edit

Note: this requires modifying the source code cls_datagrid.php which is only available to phpGrid commercial licenses.

phpGrid only validate data entry via client-side javascript. To display server-side error, modify the code to add errorfunc to grid.editRow in display_properties_main method so that users know that an server error occurred. The server will throw error during Ajax call similar to the following 

Error: Could not execute query UPDATE orders SET ORDERNUMBER=.....WHERE orderNumber=0 in db_query()

See the detail errorfunc usage here: excerpt: errorfunc: if defined, this function is called after the data is saved to the server. Parameters passed to this function are the rowid and the the response from the server request.

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