Grid questions in scripting

Use scripting to get and set values for Grid questions.

The functions in this topic apply to the following question types:

Table 1. Grids
Function	Description
`question.getItems()`	Gets an array of statement objects.
`question.unset();`	Unsets the value so that there is a default no value state for the question.

Table 2. Items
Function or property	Description
`item.index;`	A read-only property that reflects the authored index of the statement.
`item.getSelectedIndex();`	Returns the index of the selected choice. This value is zero-based. For a Single Choice Grid, this returns -1 if no item is selected.
`item.getSelectedIndexes();`	Returns a list of selected indices. Returns an empty array if no item is selected.
`item.set([index, …]);`	Applies to Multiple Choice Grids. Zero-based, so if you select the first two choices, the array is 0 and 1. Does not clear other selections.
`item.set(index);`	Applies to both question types. For Single Choice questions, this function sets a new selection and unsets the current selection. For Multiple Choice questions, this function sets a new selection but does not clear other selections.
`item.get(index);`	Returns an object that has this schema: `{ selected: }` Possible values for selected are true or false.
`item.unset();`	Resets the statement response.
`item.unset(index);`	Applies to both question types. Unsets the value so that there is a default no value state for the item.
`item.unset([index, ...]);`	Applies to Multiple Choice Grids. Unsets the value so that there is a default no value state for the item.