Question

I have a div elements with data-seat and data-row property:

<div class='selected' data-seat='1' data-row='1'></div>
<div class='selected' data-seat='2' data-row='1'></div> 
<div class='selected' data-seat='3' data-row='1'></div> 
<div class='selected' data-seat='1' data-row='2'></div>
<div class='selected' data-seat='2' data-row='2'></div>

I want print friendly message for selected seats:

var  selectedPlaceTextFormated =''; 
$(".selected").each(function () {

        var selectedPlace = $(this);

        selectedPlaceTextFormated += "Row " + selectedPlace.attr("data-row") + " (seat " + selectedPlace.attr("data-seat") + ")\n";
    });
alert(selectedPlaceTextFormated);

This code works well and shows the following:

Row 1 (seat 1)
Row 1 (seat 2)
Row 1 (seat 3)
Row 2 (seat 1)
Row 2 (seat 2)

But, I want group seats by row, i.e I want the following:

Row 1(seats: 1,2,3)
Row 2(seats: 1,2)

also, order by row number. How can I do this?
Thanks. DEMO

Answer 1

Here is the code

var selectedPlaceTextFormated ='';
var row_array = [];

$(".selected").each(function () {
    var selectedPlace = $(this);
    if (!row_array[selectedPlace.attr("data-row")]){
      row_array[selectedPlace.attr("data-row")] = selectedPlace.attr("data-seat");
    }
    else row_array[selectedPlace.attr("data-row")] += ','+selectedPlace.attr("data-seat");
});

for (row in row_array){
    alert("Row "+ row +"(seat " + row_array[row] + ")\n" );
}

And here the link to the working fiddle: http://jsfiddle.net/3gVHg/