ToggleButton.OnKeyDown 属性 (Access)ToggleButton.OnKeyDown property (Access)

设置或返回 属性 窗口中 键按下 框中的值。Sets or returns the value of the On Key Down box in the Properties window. String 类型,可读写。Read/write String.



_表达式_一个代表**切换按钮** 对象的变量。expression A variable that represents a ToggleButton object.


此属性有助于以编程方式更改在触发事件时 Microsoft Access 所采取的操作。This property is helpful for programmatically changing the action that Microsoft Access takes when an event is triggered. 例如,在各次事件调用之间可能要根据触发事件的环境更改表达式的参数,或从一个事件过程切换到一个表达式或宏。For example, between event calls you may want to change an expression's parameters, or switch from an event procedure to an expression or macro, depending on the circumstances under which the event was triggered.

当用户按下某个键时窗体或控件具有焦点时,将发生 KeyDown 事件。The KeyDown event occurs when a user presses a key while a form or control has the focus. 如果您在窗体或控件使用 SendKeys 操作的宏或 Visual Basic 中的 SendKeys 语句发送击键,也会发生此事件。This event also occurs if you send a keystroke to a form or control by using the SendKeys action in a macro or the SendKeys statement in Visual Basic.

根据 "选择生成器" 窗口 (在对象的 "属性" 窗口中选择 "键按下" 框旁边的 "生成" 按钮即可访问该窗口) 中所选内容的不同, OnKeyDown值将为下列值之一:The OnKeyDown value will be one of the following, depending on the selection chosen in the Choose Builder window (accessed by choosing the Build button next to the On Key Down box in the object's Properties window):

  • 如果选择 "表达式生成器", 则值将为_表达式_, 其中_expression_是 "表达式生成器" 窗口中的表达式。If you choose Expression Builder, the value will be =expression, where expression is the expression from the Expression Builder window.

  • 如果选择 "宏生成器", 则值是宏的名称。If you choose Macro Builder, the value is the name of the macro.

  • 如果选择 "代码生成器", 则值将为 [事件过程]。If you choose Code Builder, the value will be [Event Procedure].

如果“键按下”**** 框为空,属性值就为空字符串。If the On Key Down box is blank, the property value is an empty string.


下面的示例将在 "即时" 窗口中打印 "订单输入" 窗体上 "确定" 按钮的OnKeyDown属性的值。The following example prints the value of the OnKeyDown property in the Immediate window for the button named OK on the Order Entry form.

Debug.Print Forms("Order Entry").Controls("OK").OnKeyDown

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