Question

I have to make this addRows method with some data, which needs following construction.

data.addRows([
    ['UK', 10700,100],
    ['USA', -15400,1]    
  ]);

But i have only this way data coming, how can i make it for above method?

  var custom = new Array();
  success : function(msg)
  {
    /* Make this structure
    [
     ['UK', 10700,100],
     ['USA', -15400,1]    
    ]    
    */
    var total = parseInt(msg.total);
    for(i=0; i < total; i++ ) {
      custom[0][i][0] = msg.rows[i].land;
      custom[0][i][1] = msg.rows[i].id;
      custom[0][i][2] = msg.rows[i].id;
    }        
  }
  data.addRows(custom); // does not work

Error: (tried 3 examples all return same)

Uncaught TypeError: Cannot call method 'toString' of null
Uncaught TypeError: Cannot read property 'land' of undefined

Answer 1

The splice method can be used to add elements to an array en masse

    var arr = ["a", "b"];

    var newItems = ["c", "d", "e"];

    [].splice.apply(arr, [arr.length, 0].concat(newItems));

    console.log(arr.join()); //a,b,c,d,e
    console.log(arr.length); //5

---

Or you could add something like this to Array’s prototype:

Array.prototype.addRows = function(arr) {
    var self = this;
    arr.forEach(function(val) {
        self.push(val);
    });
}

var arr = ["a", "b"];

arr.addRows(["c", "d", "e"]);

for (var i = 0; i < arr.length; i++)
    console.log(arr[i]);

DEMO