TextBox::firstChange Event

The firstChange event of the TextBox control is generated when the user performs keyboard or cut and paste actions that result in any of the following conditions.

• The text box goes from an empty to a non-empty state

• The text box goes from a non-empty to an empty state

• The first change made after the text has been set by the form build process or by JADE logic

Use the firstChange event to move logic from other key events when that logic is relevant only to the first time the text changes; for example, when the logic is recording that the text content has changed. As a result, removal of the other key events reduces the number of events that must be sent and processed for each key that is pressed.