N/ui/serverWidget Module
Field.addSelectOption()
Method Description: Adds the select options that appears in the dropdown of a field. After you create a select or multi-select field that is sourced from a record or list, you cannot add additional values with Field.addSelectOption(options). The select values are determined by the source record or list.
Returns: void
Supported Script Types: SuiteScript 2.0 Suitelet Script Type and SuiteScript 2.0 User Event Script Type (beforeLoad(scriptContext))
Governance: None
Module: N/ui/serverWidget Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Field.addSelectOption(options)

// Code Example 1

//Add additional code

//...

var form = serverWidget.createForm({

    title : 'Simple Form'

});

var selectField = form.addField({

    id : 'custpage_selectfield',

    type : serverWidget.FieldType.SELECT,

    label : 'Select'

});



selectField.addSelectOption({

    value : '',

    text : ''

});



selectField.addSelectOption({

    value : 'a',

    text : 'Albert'

});

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4449822161.html