January 2012
Intermediate to advanced
584 pages
11h 56m
Chinese
Content preview from 操作介面設計模式 第二版
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230
|
第五章
字母標記捲軸（
Alphabetic Scroller
）
圖
5
-
32
About.com
這是什麼
沿著捲軸顯示字母陣列，來自一份依字母排序的清單。
何時使用
使用者將在一份很長的清單中搜尋非常特殊的項目，清單通常編排為一份可捲動清
單、表格或樹。我們想讓項目尋找的工作儘可能輕易快速地達成。
為何使用
字母標記捲軸不太常見，但使用方式一目瞭然。這個模式提供一份清單內容的互動
地圖，與（第三章提到的）註解式捲軸（Annotated Scrollbar）大致相似。前述兩
種模式都與跳至項目（Jump to Item）非常接近 — 都能夠立即跳到有序清單中的指
定地點。
這個模式大概是由實體書籍（例如字典）與手冊類（例如通訊錄）演化而來；這類
製品會依字母順序排列並標出各字母所佔的位置。
DI_2e_ch05.indd 230 2012/1/5 下午 03:48:37
模式
|
231
原理作法
把一個依字母序排列的長清單放入可捲動的區域中。沿著捲軸顯示字母，當使用者點擊
字母時，即捲動清單到字母指示的位置（參見圖 5-32，本章一開始列出的範例圖）。
有許多字母排序清單的操作範例都以這種方式運作，但其他排序方式 — 例如數字
排序或日期排序的清單，也一樣可透過這個模式運作得很好。請考慮把這個模式
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.