javascript: access the item inside array of array

Question

I'm new to Javascript and I have a problem to access the item inside array of array. I'm using the AngularJs framework and here is the code:

$scope.db.items4 = [];  
var newRow={
    ID:0,
    action1:[0,0,0,0,0,0,0],
    action2:[0,0,0,0,0,0,0]
    };

$scope.db.items4.push(newRow);

for (var j = 0; j < 50; j++){
   var lastRow=items4.length-1;
   var thatDay=ts.items[j].day;
   if(items4[lastRow].ID=="0"){
       items4[lastRow]=ts.items[j].ID;
       items4[lastRow].action1[thatDay]=ts.items[j].action1;
       items4[lastRow].action2[thatDay]=ts.items[j].action2;
   }else{
    if(items4[lastRow].ID==ts.items[j].ID && items4[lastRow].action2[thatDay]=="0") { 
       items4[lastRow].action1[thatDay]=ts.items[j].action1;
       items4[lastRow].action2[thatDay]=ts.items[j].action2;
        } else{
           var newRow2={
            ID:0,
            action1:[0,0,0,0,0,0,0],
            action2:[0,0,0,0,0,0,0]
            };
            $scope.db.items4.push(newRow2);
            lastRow++;
            items4[lastRow]=ts.items[j].ID;
            items4[lastRow].action1[thatDay]=ts.items[j].action1;
            items4[lastRow].action2[thatDay]=ts.items[j].action2;
            }
        }
   }

When I run it, the javascript console always says:

Uncaught ReferenceError: items4 is not defined

But obviously items4 has been defined in the beginning; ( any help is appreciated.

If you cache items4[lastRow] you'll make that code 1000 times cleaner. — elclanrs
– elclanrs, Commented Apr 24, 2013 at 20:59
No, items4 hasn't been defined, $scope.db.items4 has been. — Felix Kling
– Felix Kling, Commented Apr 24, 2013 at 21:00
yeah, it looks like you have actually never defined items4...that would be something like var items4 = $scope.db.items4; — Timmerz
– Timmerz, Commented Apr 24, 2013 at 21:02
the irony is that you have typed items4 a million times and forgot to even define it. — Timmerz
– Timmerz, Commented Apr 24, 2013 at 21:02

Ahmed El Kilani · Accepted Answer · 2013-04-24 21:08:31Z

1

If you wanna simplify it change the first line to be like this:

var item4 = $scope.db.items4 = [];

answered Apr 24, 2013 at 21:08

Ahmed El Kilani

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2 Comments

Vincent Zhou Over a year ago

Thanks.I thought $scope.db.items4 means items4. Now there is no more "items4 is not defined " but the result is still not correct. Is items4[i].action2[j] the right way to access the element inside the array of array? thanks.

Ahmed El Kilani Over a year ago

Well, you are overriding the items4[lastRow] with the ID value which i expect it to be a string or number value: >> items4[lastRow]=ts.items[j].ID; So now items4[lastRow] contains a string or number value of the ID and not the object. So calling item4[lastRow].action1 should throw an error.

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