Question Editor API Methods

Revert Question Editor state to a previously captured state.

Conditions that may prevent operation to be performed:

• A previous Undo/Redo operation is still running.
• There are no previous snapshots to revert to.
• A snapshot is currently being saved.
• The page has not yet completely loaded.

To know when the undo operation has completed, listen to the revisionHistoryState:change (refer to event types) and watch for when either canUndo or canRedo is true.

Examples

// event to listen - after modifying any input field
questionEditorApp.on("revisionHistoryState:change", function (data) {
    console.log(data); //{canUndo: true, canRedo: false}
});

questionEditorApp.undo(); //{canUndo: false, canRedo: true}

Arguments

None.

Return value

Type boolean

Type null