Scroll bars form fields have a variety of uses. They are commonly used for providing the application end-user with a convenient mechanism for scrolling over more data than fits on the screen, but they can be used for other purposes as well. The data type for a scroll bar is always numeric. The values that an activated scroll bar delivers (or can be assigned) is a function of a numeric scale, and a small and large increment within that scale.
| Scale | The scale associated with a scroll bar is defined by a minimum and a maximum value. For a vertical scroll bar, these values correspond to the scroll bar's "bar" being positioned at the top and bottom respectively, within the scroll bar's "trough". For a horizontal scroll bar, read far left for top and far right for bottom. |
| Small Increment | The small increment associated with a vertical scroll bar is that amount that is added to (or subtracted from), the current value of the scroll bar when the application end-user clicks on the top (or bottom) arrow. For a horizontal scroll bar, read left arrow for top arrow, and right arrow for bottom arrow. |
| Large Increment | The large increment associated with a vertical scroll bar is that amount that is added to (or subtracted from), the current value of the scroll bar when the application end-user clicks within the top (or bottom) portion of the "trough". For a horizontal scroll bar, read left for top and right for bottom. |