Hi,

There are several things wrong in the provided code:

objRow.cells[0].value=arrData[0]; within the addRow callback function.
objGrid.dataSource.dataSource=_data; – dataSource.dataSource is incorrect way to update a data adapter.

For adding & updating rows we have an online example: https://www.htmlelements.com/demos/grid/dynamic-rows/.

To add a row to the first position, simply modify it to use splice instead of push:

rows.splice(0,0,createRow());

or addRow method like that:

document.querySelector('smart-grid').addRow(createRow(), false);. The second parameter instructs the datagrid to add the new row to the top.

Best regards,
Peter Stoev

Smart UI Team
https://www.htmlelements.com/