Displaying Value Lists in ComboBox

Classic Servoy
1

Perhaps I am missing something obvious but I cannot see a way to select a null value after a value has been selected or to be able to edit the valuelist on the fly and add new values where appropriate?

TIA

2

Probably you are looking for application.setValueListItems

application.setValueListItems( name, display_val_array/dataset, [real_values_array])

From servoy developer move sample:

//Fill a custom type valuelist with values from array(s) or dataset
//set display values (return values will be same as display values)
application.setValueListItems('my_en_types',new Array('Item 1', 'Item 2', 'Item 3'));
//set display values and return values (which are stored in dataprovider)
//application.setValueListItems('my_en_types',new Array('Item 1', 'Item 2', 'Item 3'),new Array(10000,10010,10456));
//do query and fill valuelist (see databaseManager for full details of queries/dataset)
//var query = 'select c1,c2 from test_table';
//var dataset = databaseManager.getDataSetByQuery(controller.getServerName(), query, null, 25);

//application.setValueListItems('my_en_types',dataset);

You will be able to select an empty value if you select “allow empty value” when defining your valuelist in the “define valuelist” form.