mouseDown event


Initiates when a form filler presses the mouse button at the same time that the pointer is within a field.

Note: When a mouseDown event initiates for a text or numeric field, calculations or scripts run immediately. However, the value of the field does not change in response to calculations and scripts until the field loses focus. When a mouseDown event initiates for a signature field, the event initiates before the signature process begins.


Interactive event


Client application


Acrobat and Adobe Reader


HTML browser



XFA 2.1


You can use this event to perform an action as a direct response to a form filler clicking a button, or selecting a radio button or check box on a form. For example, you can use the mouseDown event for a check box to hide and show a field on the form. This event is conceptually similar to the click event and has a similar purpose.

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