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+----- Thread: TIWListbox how to get Selected Values (Priority support) (/thread-3111.html)
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TIWListbox how to get Selected Values (Priority support) - valmeras - 04-02-2023
I am using Intraweb 15.2.69 with Rad Studio 10.2.3
How to get all the values or text selected in a TIWListBox when MultiSelect option is true?
Because TIWListBox->SelectedValue and TIWListBox->SelectedText are both UnicodeString instead of TStringList!
So only one value is returned instead of a list even when multiple values are selected at the same time!
RE: TIWListbox how to get Selected Values (Priority support) - valmeras - 04-06-2023
I am supposed to be a priority user!
Why I have no response up to today?
RE: TIWListbox how to get Selected Values (Priority support) - Alexandre Machado - 04-06-2023
SelectedValue and SelectedText are utility methods to retrieve a single selected item in all TIWCustomListCombo descendants (which include all IWComboBoxes and ListBoxes)
In order to retrieve a list with the selected items you can do (in C++):
Code:
void ListBoxGetSelectedValues(TIWListBox* listBox, TStringList* selectedValues)
{
if (listBox->MultiSelect)
{
for (int i = 0; i < listBox->Items->Count; i++)
{
if (listBox->Items->Selected[i])
{
if (listBox->ItemsHaveValues)
{
selectedValues->Add(listBox->Items->ValueFromIndex[i]);
}
else
{
selectedValues->Add(listBox->Items->Strings[i]);
}
}
}
}
else
{
selectedValues->Add(listBox->GetSelectedValue());
}
}RE: TIWListbox how to get Selected Values (Priority support) - Alexandre Machado - 04-07-2023
We are going to extend the TIWCustomListCombo.GetSelectedValue and GetSelectedText to include all elements in a single string (comma delimited) as it works with the TIWSelect control. This modification will be included in the next update
RE: TIWListbox how to get Selected Values (Priority support) - valmeras - 04-07-2023
Thanks
But why not to have the TIWListBox return a TStringList instead of a UnicodeString?
A TStringList will make it easier to retrieve the values.
At the contrary of a UnicodeString for which I will need to write a code to separate the values from the commas.
RE: TIWListbox how to get Selected Values (Priority support) - MJS@mjs.us - 04-07-2023
>>A TStringList will make it easier to retrieve the values.
>>At the contrary of a UnicodeString for which I will need
>>to write a code to separate the values from the commas.
TStringList contains the property DelimitedText. Assign DelimitedText a string of comma (or any other delimiter) separated values to populate the TStringList, no need to write code to separate the values:
Code:
auto_ptr<TStringList> s(new TStringList);
s->DelimitedText = "1,2,3";RE: TIWListbox how to get Selected Values (Priority support) - valmeras - 04-07-2023
I know!
I just wanted to avoid to manipulate this kind of staffs like additional variables, pointers specially when working with threads!
If the TStringList is a property of the component, it automatically goes with it!
RE: TIWListbox how to get Selected Values (Priority support) - Alexandre Machado - 04-07-2023
If I create a TStringList inside the method and return a instance to the calling code you will also have to deal with its destruction and call it inside a try..finally block which is basically an anti-pattern considering this specific scenario.
It is a much better and clean code if the calling code creates the TStringList and takes care of its destruction.
RE: TIWListbox how to get Selected Values (Priority support) - DanBarclay - 04-12-2023
(04-07-2023, 12:00 AM)Alexandre Machado Wrote: We are going to extend the TIWCustomListCombo.GetSelectedValue and GetSelectedText to include all elements in a single string (comma delimited) as it works with the TIWSelect control. This modification will be included in the next update
Is there a condition comma would be in the items? Maybe a non printable, or definable, delimiter?
I don't have this problem, just looking considering future issues.
Dan
RE: TIWListbox how to get Selected Values (Priority support) - Alexandre Machado - 04-15-2023
If comma is in the items, that item will be enclosed in double quotes. Something like what TStringList does