Why can´t I delete these items into a listbox? English /Spanish
Quote from JoaquinFDEZ on April 24, 2020, 8:22 pmHI Again .
I have created a listbox and filled it with 10 items with a pushbutton
like this : on Click do it
setvar [valorI] " "
loop 0 10 [valorI]
ListBoxAddItem "Listbox1" "[valorI]" ""
endloopResult: 1,2,3,4,..10 ok?
so When I Create a list command to delete the items with other button, No That
on click do it
setvar [valorI] " "
loop 0 10 [valorI]
ListBoxDeletedItem "Listbox1" "[valorI]" ""
endloopResult: 1,3,5,7,9
Why happen this when I want to delete all items ?
Spanish: Hola a todos, estoy intentando borrar un listbox de items y no consigo borrarlo enteramente , siempre me quedan residuos de datos que previamente he añadido al listbox.
Esto es: He creado un listbox y dos botones uno añade 10 items al listbox mediante un bucle loop y el otro botón debería borrar esos mismo 10 items con el mismo bucle loop , pero no , solo me borra los pares y me deja los impares . ando loco intentando encontrar una explicación y por supuesto una solución
Si podeís ayudarme y explicarme porque me ocurre lo que expongo en el ejemplo de arriba os estaría muy agradecido.
HI Again .
I have created a listbox and filled it with 10 items with a pushbutton
like this : on Click do it
setvar [valorI] " "
loop 0 10 [valorI]
ListBoxAddItem "Listbox1" "[valorI]" ""
endloop
Result: 1,2,3,4,..10 ok?
so When I Create a list command to delete the items with other button, No That
on click do it
setvar [valorI] " "
loop 0 10 [valorI]
ListBoxDeletedItem "Listbox1" "[valorI]" ""
endloop
Result: 1,3,5,7,9
Why happen this when I want to delete all items ?
Spanish: Hola a todos, estoy intentando borrar un listbox de items y no consigo borrarlo enteramente , siempre me quedan residuos de datos que previamente he añadido al listbox.
Esto es: He creado un listbox y dos botones uno añade 10 items al listbox mediante un bucle loop y el otro botón debería borrar esos mismo 10 items con el mismo bucle loop , pero no , solo me borra los pares y me deja los impares . ando loco intentando encontrar una explicación y por supuesto una solución
Si podeís ayudarme y explicarme porque me ocurre lo que expongo en el ejemplo de arriba os estaría muy agradecido.
Quote from Gaev on April 24, 2020, 9:27 pm@joaquinfdez
Why happen this when I want to delete all items?
When you ask to do ListBoxDeleteItem, the second parameter is the order of the item (i.e. first, second etc.)... not the item with that content ... and the order starts at 1 (not zero).
a) Initially, the items have values 0,1,2,3,4,5,6,7,8,9,10
b) After you delete the first item from the beginning i.e. the one with value 0, the remaining items are ones with value 1,2,3,4,5,6,7,8,9,10
c) the next time you loop back, you ask to delete the second item from the beginning i.e. the one with value 2 (not 1), the remaining items are ones with value 1,3,4,5,6,7,8,9,10
d) the next time, you ask to delete the third item from the beginning i.e. the one with value 4, so the remaining items are ones with value 1,3,5,6,7,8,9,10
... and so on ... when you ask to delete an item whose order is greater than the number of items, nothing happens.
Unfortunately, unlike VisualNEOWin, VisualNEOWeb does NOT accept something like ...
Loop 10 0 [valueI]Also, since ListBox items are referenced starting with 1 (not zero), you may have noticed that after you add the entries, there is a blank entry before the 0 ... so, when adding entries, try...
loop 1 10 [valueI]And when you want to delete entries, loop 1 to 11 like this ...
Loop 1 11 [valueI] ListBoxDeleteItem "Listbox1" 1 Endloop
Why happen this when I want to delete all items?
When you ask to do ListBoxDeleteItem, the second parameter is the order of the item (i.e. first, second etc.)... not the item with that content ... and the order starts at 1 (not zero).
a) Initially, the items have values 0,1,2,3,4,5,6,7,8,9,10
b) After you delete the first item from the beginning i.e. the one with value 0, the remaining items are ones with value 1,2,3,4,5,6,7,8,9,10
c) the next time you loop back, you ask to delete the second item from the beginning i.e. the one with value 2 (not 1), the remaining items are ones with value 1,3,4,5,6,7,8,9,10
d) the next time, you ask to delete the third item from the beginning i.e. the one with value 4, so the remaining items are ones with value 1,3,5,6,7,8,9,10
... and so on ... when you ask to delete an item whose order is greater than the number of items, nothing happens.
Unfortunately, unlike VisualNEOWin, VisualNEOWeb does NOT accept something like ...
Loop 10 0 [valueI]
Also, since ListBox items are referenced starting with 1 (not zero), you may have noticed that after you add the entries, there is a blank entry before the 0 ... so, when adding entries, try...
loop 1 10 [valueI]
And when you want to delete entries, loop 1 to 11 like this ...
Loop 1 11 [valueI] ListBoxDeleteItem "Listbox1" 1 Endloop
Quote from luishp on April 25, 2020, 6:18 amUnfortunately, unlike VisualNEOWin, VisualNEOWeb does NOT accept something like ... Loop 10 0 [valueI]
Will try to add this in next update. Thank you!
Unfortunately, unlike VisualNEOWin, VisualNEOWeb does NOT accept something like ... Loop 10 0 [valueI]
Will try to add this in next update. Thank you!
Quote from JoaquinFDEZ on April 25, 2020, 10:36 amI´m very grateful to you because you are helping me a lot with my doubts (Gaev and Luishp)
I´m very grateful to you because you are helping me a lot with my doubts (Gaev and Luishp)
Quote from luishp on April 25, 2020, 10:39 amPlease take a look here:
https://visualneo.com/forum/topic/important-using-listbox-combobox-and-dropdown-properly
Please take a look here:
https://visualneo.com/forum/topic/important-using-listbox-combobox-and-dropdown-properly