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無線電鈕

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Microsoft Windows上使用傳統配色的無線電鈕例子,括號內的為快速鍵

無線電鈕(英語:Radio button),又叫單選鈕单选框,是圖形用戶界面上的一種控件。它容許用戶在一組選項中選擇其中一個。無線電鈕的外觀一般是一個空白的洞。而在它的旁邊則通常有一個文字的標籤。它的用途除了描述之外,還可用於選擇該選擇:當用戶按下標籤,就會選取對應應的無線電鈕。已選上的無線電鈕一般會在圓洞內加上一小圓點。

另外為了加強可親性accessibility),無線電鈕可以對應上一個快速鍵access key),使用家可使用鍵盤上的按鍵來選擇所應的無線電鈕。一般來說,標籤上的快速鍵會用底線標示,例如「Activate」代表A為快速鍵。而當快速鍵沒有在標籤內出現,便會用括號表示,例如「啟用(A)」。

無線電鈕一旦選上,除了選擇另一個選項之外,便沒法取消。所以有時在一些用戶介面上會有空白的選擇、重置或預設按鈕。

當選項很多時,單選下拉式選單可能比較適合,因為它所占用的畫面空間比無線電鈕來得要少。

參見

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無線電鈕
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