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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模式
|
369
輸入提示（
Input Prompt
）
圖
8
-
15
Yahoo!
的註冊頁面
這是什麼
在文字欄位或下拉式清單中，預先填入提示訊息，告訴使用者要做什麼或要鍵入的
內容。
何時使用
UI 提供一個文字欄位、下拉式控制元件或複式盒以便輸入。通常會使用良好的預
設值 ，但 是在 這 裡的 案例 中不 能 這 麼 做 — 或 許 是 因為 沒有 合理 的 預 設 值， 就像
圖 8-15 的 Yahoo! 表單的狀況。
為何使用
這個模式能讓 UI 說明自己的用途。就像輸入線索（Input Hints），輸入提示是種
暗中提供控 制元件協助 資訊的方式 ，而這些控 制元件的目 的或格式可 能不算一目
瞭然。
有了輸入線索，快速掃視 UI 的使用者能夠輕易地忽略線索（或者徹底置之不理）。
有時候你的確是希望這樣。但是輸入提示卻出現在使用者必須鍵入資料的地方，所
以無法被忽略。優點是，使用者不用猜測是否必需處理這個控制元件 — 控制元件
本身就已經告訴使用者要怎麼辦了。（請記得使用者填寫表單不是為了好玩 — 能
夠少做一點，使用者就會盡量少做一點。）控制元件中出現一個問題或者一個命令
如「在這裡填入資料！」，多半會讓使用者注意到。
此模式具有 一個有趣的 副作用：使 用者可能甚 至懶得閱讀 放置在文字 欄位前面的
標籤。再 次看看 圖 8 - 15；就 表單的意 義而言 ， 「N a me」標 籤根本是 多餘的 。 因
為使用者的 視線首先會 落在文字欄 位上，可能 先讀到輸入 提示「F i rs
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.