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If I read tableview.selected_row, it returns (0,0) if the first row is selected, but it also returns (0,0) if no rows are selected. How can I tell whether the first row of a tableview is selected or not?

Are you reading this from within a tableview callback? Share some code?

If you press the ‘check’ button when no rows are selected, it shows (0,0), the same as when the first row is selected:

import ui

def check_selected_row(sender):
    #print(tbl.selected_row)
    lbl.text = str(tbl.selected_row)
    tbl.reload_data()

v = ui.View(bg_color='white')
tbl = ui.TableView(frame=(50,0,100,180))

data = ('zero','one','two')
tbl.data_source=ui.ListDataSource(data)

btn = ui.Button(frame=(250,100,0,0),bg_color='yellow',title='check',action=check_selected_row)

lbl = ui.Label(frame=(50,220,100,100))

v.add_subview(btn)
v.add_subview(tbl)
v.add_subview(lbl)
v.present('fullscreen')

Sorry, I lost the indent tabs on the def: above

What if you call from within tableview_did_select? Or, add @on_main_thread before your button action?

@JonB said

add @on_main_thread before your button action?

No change

Remark that if you print tbl.selected_row after present, it is already (0,0)

@peiriannydd try this code and see use of your own variable tbl.selected

import ui

def check_selected_row(sender):
    #print(tbl.selected_row)
    lbl.text = str(tbl.selected)
    tbl.reload_data()

class TableViewDelegate():  
    def tableview_did_select(tableview, section, row):
        tableview.selected = (section, row)

v = ui.View(bg_color='white')
tbl = ui.TableView(frame=(50,0,100,180))
tbl.delegate = TableViewDelegate
tbl.selected = (-1,-1)

data = ('zero','one','two')
tbl.data_source=ui.ListDataSource(data)

btn = ui.Button(frame=(250,100,0,0),bg_color='yellow',title='check',action=check_selected_row)

lbl = ui.Label(frame=(50,220,100,100))

v.add_subview(btn)
v.add_subview(tbl)
v.add_subview(lbl)
v.present('fullscreen')

Now instead of reading (0,0) when no rows are selected I read (0,) when no rows are selected

@peiriannydd you're right, when you reload_data, reset also tbl.selected

def check_selected_row(sender):
    #print(tbl.selected_row)
    lbl.text = str(tbl.selected)
    tbl.reload_data()
    tbl.selected = (-1,-1)

Thank you cvp, I appreciate your help