Reference_Syntax.commitOn = “select | exit”
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Note:
Having a choice list commit data as soon as selections are made may be important in forms that contain non-XFA interactive features, such as Acrobat annotations or hypertext links. People filling out such forms may mistakenly believe that selecting an item from a choice list followed by clicking a non-XFA interactive feature is the same as exiting the checklist. In fact, the check list remains the field in focus.
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The selected data is not written to the data model until the field loses focus. This is the recommended setting for choice lists that support multiple selections (open=”multiSelect”).
Form Model

commitOn