June 2014
Intermediate to advanced
488 pages
9h 56m
Chinese
Content preview from MOBILE HTML5學習手冊
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第四章
雖然你可以在 email 與 URL 加入
maxlength
，但我通常會建議不要使用它，除非有讓人
信服的理由。既然所有瀏覽器都支援任何 email 及 URL 長度，為什麼要讓使用者介面判
斷某個 email 地址或 URL 過長？除非基於安全性的考量，以及有實際字元的限制，否則
為了有良好的使用者體驗，你應該仔細思考添加這個屬性的後果。即使 Twitter 也不會
使用它，因為使用者有時想要輸入 140 個字元以上，接著再刪去一些單字或字元，讓它
們可以小於 140 個字元的限制。
size 屬性
size
屬性是另一個舊屬性。之前它有兩種功能：定義表單控制項（如
<select>
）要顯示
的選項，以及定義表單控制項顯示的字元數目來控制寬度。
<input>
元素的
size
屬性應
該被汰除，改用 CSS 來指定表單的版面配置。
事實上
size
屬性曾經被汰除一段時間，但又被放回 HTML5 草案規格。
size
屬性不會影
響可輸入的字元（應使用
maxlength
），或可選擇的選項（應使用
multiple
）。
form 屬性
在 HTML5 中，表單控制項不一定要被嵌套在表單裡面，這是新的功能。新的
form
屬性
可以讓一個表單元素與任何網頁中的表單結合。它們也可以被嵌套在一個表單中，但由
另一個表單提交。
表單控制項可以有一個
form
屬性及
form
的
id
，讓表單控制項可以連結它。透過這種方
式，你可以將表單控制項放在網頁的任何位置，包括負責提交它的表單的外面。
這有一點複雜，所以我們來看一個範例：
<form ...
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