# OnClientNumericTextBoxValueChanging

The **OnClientNumericTextBoxValueChanging** client-side event occurs when the user is changing the value in the NumericTextBox.

1. The instance of the **ribbonbar** firing the event

2. An **eventArgs** parameter containing the following methods:

   * get_numericTextBox()

   * get_value()

   * get_cancel()

   * set_cancel()