EditableGrid how to fetch rows from MySql in php

[TatsuSheva]

I am trying to do an editable grid table in order to modify directly.
There is a field which I need to list all of it content so that I can select one.
Look at my code :
function fetch_pairs($mysqli,$query){ if (!($res = $mysqli->query($query)))return FALSE; $rows = array(); while ($row = $res->fetch_assoc()) { $first = true; $key = $value = null; foreach ($row as $val) { if ($first) { $key = $val; $first = false; } else { $value = $val; break; } } $rows[$key] = $value; } return $rows; } $grid->addColumn('product-name', 'Product', 'string' , fetch_pairs($mysqli,'SELECT name FROM table_product'),true);
In my database I have two tables:
-table_add{id,product-name}
-table_product{id,name}

But the list is not appearing.
I am getting this error:
Could not load JSON from url 'loaddata.php?db_tablename=table_add'

Any idea why ?