Change DataGrid Column value based on Checkbox and first DataGrid Row

i am working in a form in Action Center.
i need to be able to change all the values of a column when a checkbox is checked based on the first value of the column.
So, if i click the checkbox and in the status column, in the first row i select To Post, then i need that all other rows for that column change the value to “To Post”.
I am making same basic Javascript code inside the DataGrid and inside the Status dropdown inside the DataGrid like this:

if (firstRowValues.Checked)
dataGrid_PDF.status = data.dataGrid_PDF[0].dropdown;

…but it is not working.
Anyone has idea how to do this?
Thank you very much!

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