Shiny

question.mixed returns a question definition that displays responses as a mix of radio-buttons and check-boxes, or as a combo-box. Can be used for defining multiple-choice questions with responses such as "none of the above" or "don't know".

1 2	question.mixed(id, label, responses, types, required = TRUE, use.select = FALSE, inline = FALSE, width = NULL, placeholder = NULL)

`id`	(character) the unique identifier of the question; it will be used as the column name in the data.frame returning the questionnaire data and when prefixed with `'question'` - as the `inputId` for the `input` slot.
`label`	(character) the text displayed as the header of the question.
`responses`	(response list) the response list giving the identifiers and labels of all responses (e.g. as returned by `buildResponses`).
`types`	(character) the types of responses; use `'radio'` for radio-buttons (single-choice / mutually exclusive responses) and `'checkbox'` for check-boxes (multiple-choice responses). The length of this vector must be the same as the number of responses defined in `responses`.
`required`	(logical) if `FALSE`, the respondent is free to not choose a response; if `TRUE`, the respondent must select a response before moving on to subsequent pages of the questionnaire.
`use.select`	(logical) if `FALSE`, displays radio-buttons and check-boxes; if `TRUE`, displays a combo-box with all responses available through the drop-down list.
`inline`	(logical) if `FALSE`, radio-buttons and check-boxes will be displayed vertically; if `TRUE`, controls will be displayed horizontally. If `use.select == TRUE`, this argument will be ignored.
`width`	(character) the width of the input, e.g. `'400px'` or `'100%'`.
`placeholder`	(character) the text that will be displayed in the combo-box when there are no responses selected yet; defaults to `"Click to select a response"` for single-choice questions (with all responses mutually exclusive) and `"Click to select responses"` otherwise. If `use.select == FALSE`, this argument will be ignored.