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## beforeOutput

The beforeOutput event occurs after data has been selected from the database and ready to be sent to client side

          $gridConn->event->attach("beforeOutput",myFunction);

In this event myFunction doesn't get any parameters.

Event can be used to mix some custom data in XML output.

Most common use-case - header structure for the grid.

    	$grid = new GridConnector($res);
    	function grid_header(){
    		echo '<head>
    	        <column width="50" type="dyn" align="right" color="white" sort="str">Sales</column>
    	        <column width="150" type="ed" align="left" color="#d5f1ff" sort="str">Book Title</column>
    		</head>';
    	}
    	$grid->event->attach("beforeOutput","grid_header");
    	$grid->render_table("grid50000","item_id","item_nm,item_cd");

In case of dyn. loading mode, one more check need to be added, to prevent data output for additional data calls.

    	$grid = new GridConnector($res);
    	function grid_header(){
                if (!isset($_GET["posStart"]))
    		echo '<head>
    	        <column width="50" type="dyn" align="right" color="white" sort="str">Sales</column>
    	        <column width="150" type="ed" align="left" color="#d5f1ff" sort="str">Book Title</column>
    		</head>';
    	}
    	$grid->event->attach("beforeOutput","grid_header");
    	$grid->dynamic_loading(100);
    	$grid->render_table("grid50000","item_id","item_nm,item_cd");