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div模拟textarea自适应高度 - DTBelieve

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Release： 2016-05-21 08:35:22
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　　之前在公司做项目的时候，有这么一个需求，要我写一个评论框，可以随着评论的行数增加而自动扩大，最开始我想用textarea实现，但是后来尝试后发现textarea并不适合，textarea的高度不会随着输入行数的增多而增大，于是我上网寻求了下帮助，发现大神张鑫旭的这篇文章《div模拟textarea文本域轻松实现高度自适应》,成功解决我的问题

代码如下：

<span style="color: #008080;"> 1</span>  1 <span style="color: #0000ff;"><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 2</span>  2 <span style="color: #0000ff;"><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="en"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 3</span>  3 <span style="color: #0000ff;"><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 4</span>  4     <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 5</span>  5     <span style="color: #0000ff;"><span style="color: #800000;">title</span><span style="color: #0000ff;">></span><span style="color: #000000;">div模拟textarea自适应高度le>
</span><span style="color: #008080;"> 6</span>  6     <span style="color: #0000ff;"><span style="color: #800000;">style </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 7</span> <span style="background-color: #f5f5f5; color: #800000;"> 7         .test_box</span><span style="background-color: #f5f5f5; color: #000000;">{</span>
<span style="color: #008080;"> 8</span> <span style="background-color: #f5f5f5; color: #ff0000;"> 8             width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">500px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;"> 9</span> <span style="background-color: #f5f5f5; color: #ff0000;"> 9             min-height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">10</span> <span style="background-color: #f5f5f5; color: #ff0000;">10             max-height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">600px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">11</span> <span style="background-color: #f5f5f5; color: #ff0000;">11             _height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #008000;">/*</span><span style="background-color: #f5f5f5; color: #008000;">兼容IE6浏览器</span><span style="background-color: #f5f5f5; color: #008000;">*/</span>
<span style="color: #008080;">12</span> <span style="background-color: #f5f5f5; color: #ff0000;">12             margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">0 auto</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">13</span> <span style="background-color: #f5f5f5; color: #ff0000;">13             padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">3px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">14</span> <span style="background-color: #f5f5f5; color: #ff0000;">14             outline</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">15</span> <span style="background-color: #f5f5f5; color: #ff0000;">15             border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1px solid #e4e4e4</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">16</span> <span style="background-color: #f5f5f5; color: #ff0000;">16             font-size</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">12px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">17</span> <span style="background-color: #f5f5f5; color: #ff0000;">17             word-wrap</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">break-word</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #008000;">/*</span><span style="background-color: #f5f5f5; color: #008000;">用于英文文本自动换行，所有主流浏览器支持</span><span style="background-color: #f5f5f5; color: #008000;">*/</span>
<span style="color: #008080;">18</span> <span style="background-color: #f5f5f5; color: #ff0000;">18             overflow-x</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">hidden</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">19</span> <span style="background-color: #f5f5f5; color: #ff0000;">19             overflow-y</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">auto</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">20</span> <span style="background-color: #f5f5f5; color: #ff0000;">20             -webkit-user-modify</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> read-write-plaintext-only</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">21</span> <span style="background-color: #f5f5f5; color: #ff0000;">21         </span><span style="background-color: #f5f5f5; color: #000000;">}</span>
<span style="color: #008080;">22</span> <span style="background-color: #f5f5f5; color: #800000;">22     </span><span style="color: #0000ff;"></span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">23</span> 23 <span style="color: #0000ff;"></span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">24</span> 24 <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">25</span> 25     <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="test_box"</span><span style="color: #ff0000;"> contenteditable</span><span style="color: #0000ff;">="true"</span><span style="color: #0000ff;">></span>我是模拟textarea的div<span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">26</span> 26     <span style="color: #0000ff;"><span style="color: #800000;">script </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/javascript"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">27</span> <span style="background-color: #f5f5f5; color: #000000;">27</span>         <span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">typeof</span><span style="background-color: #f5f5f5; color: #000000;"> document.webkitHidden </span><span style="background-color: #f5f5f5; color: #000000;">==</span> <span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">undefined</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="color: #008080;">28</span> <span style="background-color: #f5f5f5; color: #000000;">28</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 非chrome浏览器阻止粘贴</span>
<span style="color: #008080;">29</span> <span style="background-color: #f5f5f5; color: #000000;">29</span><span style="background-color: #f5f5f5; color: #000000;">             box.onpaste </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;">() {
</span><span style="color: #008080;">30</span> <span style="background-color: #f5f5f5; color: #000000;">30</span>                 <span style="background-color: #f5f5f5; color: #0000ff;">return</span> <span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">;
</span><span style="color: #008080;">31</span> <span style="background-color: #f5f5f5; color: #000000;">31</span><span style="background-color: #f5f5f5; color: #000000;">             }
</span><span style="color: #008080;">32</span> <span style="background-color: #f5f5f5; color: #000000;">32</span><span style="background-color: #f5f5f5; color: #000000;">         }
</span><span style="color: #008080;">33</span> <span style="background-color: #f5f5f5; color: #000000;">33</span>     <span style="color: #0000ff;"></span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">34</span> 34 <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">35</span> 35 <span style="color: #0000ff;"></span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span>
Copy after login

其中有一两个从没见过的属性：

  • -webkit-user-modify: read-only | read-write | read-write-plaintext-only
    read-only 内容只读。
    read-write 内容可读写。
    read-write-plaintext-only 内容可读写，但粘贴内容中的富文本格式（如文本的颜色、大小，图片等）会丢失。内容类似于以纯文本显示。
  •  contenteditable 属性规定是否可编辑元素的内容。
    true 规定可以编辑元素内容。
    false 规定无法编辑元素内容。

　　

 　　再次感谢鑫大神（http://www.zhangxinxu.com/），分享了好多非常实用的经验，等将来能达到他那种高度，我也想写出好博客分享出来造福人类，哈哈，虽然还很遥远，继续fighting~

 

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div模拟textarea自适应高度 - DTBelieve
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