December 2013
Intermediate to advanced
752 pages
16h
Chinese
Content preview from MOBILE WEB程式設計--第二版
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HTML5 表單
|
227
<optgroup label="Europe">
<option value="at">Austria</option>
<option value="be">Belgium</option>
<option value="bg">Bulgaria</option>
</optgroup>
</select>
</dd>
</dl>
圖 8-4 為這段程式的結果。不同的設備可能會以不同的方式來顯示選項群組！
圖 8-4 在舊型設備上，選項群組的顯示方式可能會很奇怪，但是 2011 年之後問世的設備通常可
以順利顯示。
單選按鈕與確認方塊
在行動設備上，單選按鈕與確認方塊的用法與桌機一樣。我給你的唯一建議是：如果選
項超過四個的話，避免使用這些控制項，使用單選或多選的
select
比較合適。擁有四個
以上單選按鈕的群組可能會增加網頁的高度，因而需要捲動，如此一來會降低表單的便
利性。
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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.
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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.