Combobox value is never NULL

Question

Hi,

i have a panel with one combobox based on a listdatasource and displayNullOption=Y.

So, it must be possible to select nothing.

After starting the panel i can see no value and have to click on the combobox arrow to select a value.

Now i want to see which value the user has selected. I have found 2 ways:

1) l_value_nr := api_datasource.getColumnValueNR('DATASOURCE_NAME.COLUMN_NAME');

or

2) l_value_nr := api_component.getValueNR('<panel_name>.<combobox_name>');

Both ways work seem to work...

HOWEVER: when the user selects the null option in the list, l_value_nr always gets the value of the first row in the datasource. So, it is never null.

How can i detect that the user has chosen the null-value in the combobox?

Kind regards, Jan Willem Vermeer

Accepted Answer

0	Sorry, solved by myself. Made a small typing mistake. With `api_component.getValueNR('<panel_name>.<combobox_name>`)' the value is null when the user selects nothing. KR Jan Willem link answered 23 Feb '17, 10:21 Jan Willem V... 143●1●13●52 accept rate: 0%

Combobox value is never NULL

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