Add two fields and display them in a default field

silens

I would like to add two fields (num1 and num2) and show it in another defaultValue field

 "columns": [
                    {"data": "id"}, 
                    {"data": "usr"}, 
                    {"data": "num1"}, 
                    {"data": "num2"}, 
                    {"defaultContent": "num1+num2"},
        ],

Andreas S.

data: '', render function( data ) {
  return data.num1 + data.num2;
}

Should use like this

silens

"columns": [
                {"data": "id"}, 
                {"data": "fecha"}, 
                {"data": "name"}, 
                {"data": "cnt"}, 
                {"data": "cnt_apr"}, 
                {
                    "data": '', 
                    render: function( data ) {
                    return data.cnt - data.cnt_apr;
                    }
                },

Thanks for answering, I get an error, I do not know if I'm doing something wrong, the error says that cnt is not defined

Andreas S.

my fault. write data: NULL, render: ….

silens

This way I get the same error.

{ "data": 'Null', render: function( data ) { return data.cnt - data.cnt_apr; } },

Andreas S.

null not in quote. data: null, render:

silens

Muchisimas gracias