How deal with checkbox in extjs grid

There are few ways to implement checkbox in extjs grid. However, I feel below one is the good one.

Use below code in grid.

{
  header : 'Reviewed',
  align:'center',
  renderer:function(val, meta, record, rowIndex, colIndex, store){
      return Ext.String.format('<input name="review[]" type="checkbox" value="{       0}">',record.get('id'));
}// here i am passing "id" value as part of check box. 

I  have one button to get those values and use it for further processing.

{
xtype: 'button',
text:'Apply Changes',
listeners : {
 click : function(){
var aunarray = "";
var check = document.getElementsByName('review[]');
var checkLength = check.length;
 for(var i=0; i < checkLength; i++){
  if(check[i].checked){
    aunarray = aunarray+","+check[i].value;
   }
 }
DW.App.getController('AdminNotification').appplyChanges(aunarray);
}
}
}