Hi to all, I'm pretty new to Dojo and I'm experiencing some problems with grids. I need to show data caught from a DB which sends them in JSON format. It's an array containing a number in the first position, and arrays again in the other positions; client side I just group the arrays in bigger ones through some criteria. Each group represents a data store for a single grid.
My problem is that grids show only question marks, instead of data. Through FireBug I had the following error description:

"this._arrayOfTopLevelItems has no properties"
"TypeError"
"(\"{\\"identifier\\":\\"Id\\",\\"items\\":[{\\"machine_id\\":1,\\"machine_line_id\\":1,\\"machine_name\\":\\"blowing machine\\",\\"machine_xml_file_path\\":\\"/etc/drupal/blower.xml\\",\\"machine_ip_address\\":\\"127.0.0.1\\",\\" ...

I tried to follow many examples, with multiple data model, but I didn't reach my goal

Here is part of the data I get after the dojo.toJson(dataobj) call and my JS code. Thanks in advance for your help.

{"identifier":"Id","items":[{"machine_id":1,"machine_line_id":1,"machine_name":"blowing machine","machine_xml_file_path":"/etc/drupal/blower.xml","machine_ip_address":"127.0.0.1","machine_nominal_speed":20000,"machine_type_id":1,"machine_is_configured":true,"machine_position":1,"machine_image_path":"/prova","machine_port":50000,"machine_driver_path":"/home/clsv/workspace/communicator/Debug/communicator"}... ]}

		@import "slm/js/dojo110/dojox/grid/_grid/tundraGrid.css";
		@import "slm/js/dojo110/dojo/resources/dojo.css";
		@import "slm/js/dojo110/dijit/themes/tundra/tundra.css";
		@import "slm/js/dojo110/dijit/themes/tundra/tundra_rtl.css";
		@import "slm/js/dojo110/dijit/tests/css/dijitTests.css";
		

	
	

	
		dojo.require("dojo.data.ItemFileReadStore");
		dojo.require("dojox.grid.Grid");
		dojo.require("dojo.parser");
		dojo.require("dojox.grid._data.model");
	
		function handleError(response,xhr)
		{
			alert("An error has occurred:\nRefresh your page and try again");
			console.debug(response);
		}
		
		function buildGrid(response,xhr)
		{	
			// we must treat data in order to convert them from string to number, boolean, ...
			for (i = 2; i < response.length; i++)
			{
				response[i]['machine_id'] = Number(response[i]['machine_id']);
				response[i]['machine_line_id'] = Number(response[i]['machine_line_id']);
				response[i]['machine_nominal_speed'] = Number(response[i]['machine_nominal_speed']);
				response[i]['machine_type_id'] = Number(response[i]['machine_type_id']);
				response[i]['machine_is_configured'] = "t"?response[i]['machine_is_configured']= true:response[i]['machine_is_configured']= false;
				response[i]['machine_position'] = Number(response[i]['machine_position']);
				response[i]['machine_port'] = Number(response[i]['machine_port']);
			}
			
			// First of all we have to create an array containing machines' data divided by lines
			
			var lines = new Array(); // this array will contain the array of each line
			
			for (i = 1; i <= response[0]; i++) // tried to do it server-side, but a sort of overflow exception was thrown
				{
					var linedata = new Array(); // this array will contain the data of all machines in one line
					
					for (j = 2; j < response.length; j++) // We start from the third position of response because the previous two are for number of lines and machine types
					{
						if (response[j]['machine_line_id'] == i) // if the line_id of the machine is the one we are treating
							linedata.push(response[j]);
					}
					lines.push(linedata);
				}
			for (i = 1; i <= response[0]; i++)
			{	
			//Data
				var j = i-1;
				var dataobj = {};
				dataobj.identifier = 'Id';
				dataobj.items = lines[j];
			
			//Store
				var store = new dojo.data.ItemFileReadStore({jsId: 'jsonStore',data: dojo.toJson(dataobj)});
				
			//Model
				//var model = new dojox.grid.data.Table(null, dojo.toJson(lines[j]));
				var model = new dojox.grid.data.DojoData(null, store, {jsId: 'model', query:{ id : '*' },clientSort:true});
				
			//Structure
				gridLayout = [
					{cells: [[
						{ name: 'Id'},
						{ name: 'Line id'},
						{ name: 'Machine name', styles: 'text-align: center;'},
						{ name: 'DDF path', styles: 'text-align: center;'},
						{ name: 'IP address', styles: 'text-align: center;'},
						{ name: 'Nominal speed', styles: 'text-align: center;'},
						{ name: 'Type', styles: 'text-align: center;'},
						{ name: 'Is configured', styles: 'text-align: center;'},
						{ name: 'Position', styles: 'text-align: center;'},
						{ name: 'Image path', styles: 'text-align: center;'},
						{ name: 'Port', styles: 'text-align: center;'},
						{ name: 'Driver path', styles: 'text-align: center;'},
						]]}];

				dojo.byId("datacontainer").innerHTML += ".."; // here I add some element to the DOM
				
				//var gridContainer = document.body.appendChild(document.createElement("div"));
				
				var gridContainer = dojo.byId("datacontainer").appendChild(document.createElement("div"));
				
				var str = "grid" + i;
			        var grid = new dojox.Grid({
			        id: str,
			        model: model,
			        structure: gridLayout,
			        autoHeight: true,
			        autoWidth: true
			      },
			      gridContainer);   
			}
			grid.startup();	
		}
		
		var xhrparam = {
								url: "initlinemach.php",
								load: buildGrid,
								error: handleError,
								handleAs: "json",
								timeout: 4000
							};
							
		dojo.xhrGet(xhrparam);